mergeto costamere date November 2009 The dystrophin associated proteincomplex is a multiprotein complex that includes dystrophin and the dystrophin associated protein s. ref MeshName Dystrophin Associated ProteinComplex ref Many forms of muscular dystrophy are associated with disorders of the dystrophin associated proteincomplex. ref name pmid12082140 cite journal author Ehmsen J, Poon E, Davies K title The dystrophin associated proteincomplex journal J. Cell. Sci. volume 115 issue Pt 14 pages 2801 3 year 2002 month July pmid 12082140 doi url http jcs.biologists.org cgi pmidlookup?view long&pmid 12082140 ref References reflist See also Costamere Muscle tissue Category Protein complexes biochem stub ... more details
protein Name Nuclear cap binding proteincomplex caption Crystal structure of the human nuclear cap binding complex. ref name pmid11545740 cite journal author Mazza C, Ohno M, Segref A, Mattaj IW, Cusack S title Crystal structure of the human nuclear cap binding complex journal Mol. Cell volume 8 issue 2 pages 383 96 year 2001 month August pmid 11545740 doi url ref image 1H6K.pdb.jpg width HGNCid Symbol AltSymbols EntrezGene OMIM RefSeq UniProt PDB 1H6K ECnumber Chromosome Arm Band LocusSupplementaryData protein Name Nuclear cap binding protein subunit 2, 20kDa caption image width HGNCid 7659 Symbol NCBP2 AltSymbols EntrezGene 22916 OMIM 605133 RefSeq NM 007362 UniProt P52298 PDB ECnumber Chromosome 3 Arm q Band 29 LocusSupplementaryData Nuclear cap binding proteincomplex is a RNA binding protein which binds to the 5 cap inside the nucleus. When RNA is exported to the cytoplasm the nuclear cap binding proteincomplex is replaced by cytoplasmic cap binding complex. The nuclear cap binding complex is composed of Cbc1 Cbc2 in yeast and CBC20 CBC80 in metazoans. References reflist External links MeshName nuclear cap binding proteincomplex biochem stub de Cap Binding Komplex ... more details
PBB geneid 160 AP 2 complex subunit alpha 1 is a protein that in humans is encoded by the AP2A1 gene . ref name pmid2564002 cite journal author Robinson MS title Cloning of cDNAs encoding two related 100 kD coated vesicle proteins alpha adaptins journal J Cell Biol volume 108 issue 3 pages 833 42 year ... not been determined. ref name entrez cite web title Entrez Gene AP2A1 adaptor related proteincomplex ... 160 accessdate ref Interactions Adaptor related proteincomplex 2, alpha 1 has been shown to Proteinprotein interaction interact with DPYSL2 ref name pmid12942088 cite journal last Nishimura first ... maintained by Protein Box Bot. See Template PBB Controls to Stop updates. PBB Summary section title summary text This gene encodes the alpha 1 adaptin subunit of the adaptor protein 2 AP2 adaptors complex found in clathrin coated vesicles. The AP 2 complex is a heterotetramer consisting of two large adaptins alpha or beta , a medium adaptin mu , and a small adaptin sigma . The complex is part of the protein coat on the cytoplasmic face of coated vesicles which links clathrin to receptors ... Interaction of Shc with adaptor protein adaptins. journal J. Biol. Chem. volume 271 issue 9 pages ... of the Eps 15 protein. journal J. Biol. Chem. volume 271 issue 20 pages 12111 6 year 1996 pmid 8662627 ... Association and colocalization of Eps15 with adaptor protein 2 and clathrin. journal J. Cell Biol ... is an EH domain binding protein implicated in clathrin mediated endocytosis. journal Nature volume ... Clathrin assembly lymphoid myeloid leukemia CALM protein localization in endocytic coated pits, interactions ... sequencing and analysis of 500 novel complete protein coding human cDNAs. journal Genome Res. volume ..., et al. title PACS 1 binding to adaptors is required for acidic cluster motif mediated protein traffic ... Controls template provides controls for Protein Box Bot, please see Template PBB Controls for details. PBB Controls update page yes require manual inspection no update protein box yes update summary ... more details
of antibodies. Immunoprecipitation studies with protein A conjugated to beads are also commonly used to purify proteins or protein complexes indirectly through antibodies against the protein or proteincomplex of interest. References reflist Category Proteins Category Staphylococcaceae de Protein ...Protein A is a 40 60 Atomic mass unit kDa MSCRAMM surface protein originally found in the cell wall of the bacteria Staphylococcus aureus . It is encoded by the spa gene and its regulation is controlled by DNA topology, cellular osmolarity, and a two component regulatory system two component system called ArlS ArlR. It has found use in biochemical research because of its ability to bind immunoglobulins . It binds proteins from many of mammalian species, most notably IgG s. It binds with the Fc region ... antibody function on their surface which disrupts opsonization and phagocytosis . Protein A antibody .... Protein A binds with moderate affinity to human IgM , IgA and IgE as well as to mouse IgG3 and IgG1 .... Other antibody binding proteins In addition to Protein A, other immunoglobulin binding bacterial proteins such as Protein G , Protein A G and Protein L are all commonly used to purify, immobilize or detect immunoglobulins. Role in pathogenesis As a pathogen Staphylococcus aureus utilizes Protein .... Protein A helps inhibit phagocytic engulfment and acts as an immunological disguise. Mutants of S. aureus lacking protein A are more efficiently phagocytosed in vitro, and mutants in infection models ... 197 1125 1139. ref Research Recombinant Staphylococcal Protein A is often produced in E. coli for use in immunology and other biological research. One recombinant form of Protein A is called MabSelect ... 18114994AE.pdf ref . Protein A is often coupled to other molecules such as a fluorescent dye , enzyme ... widely utilized coupled to magnetic, latex and agarose beads. Protein A is often immobilized onto a solid support and used as reliable method for purifying total IgG from crude protein mixtures ... more details
together to achieve a particular function, and they often associate to form stable proteincomplexcomplex ..., which function as a single proteincomplex . Proteins are not entirely rigid molecules. In addition ... proteincomplex es that carry out many closely related reactions with a common biological function ... of complexprotein mixtures by liquid phase isoelectric focusing journal Methods in Molecular Biology ...About a class of molecules protein as a nutrient Protein nutrient other uses pp semi indef pp move indef File Myoglobin.png thumb right 250px A representation of the 3D structure of the protein myoglobin showing colored alpha helix alpha helices . This protein was the first to have its structure solved ... compound compounds consisting of one or more polypeptide s typically folded into a globular protein globular or fibrous protein fibrous form in a biologically functional way. A polypeptide is a single ... acids in a protein is defined by the DNA sequence sequence of a gene , which is encoded in the genetic ... or even during synthesis, the residues in a protein are often chemically modified by post translational ... to be single structure. Other proteins undergo large rearrangements from one protein conformation ... signaling event . Thus, the structure of a protein serves as a medium through which to regulate either the function of a protein or activity of an enzyme. Not all proteins requiring a folding process ... ingested protein into free amino acids that are then used in metabolism. Proteins were first described ... Jakob Berzelius in 1838. Early nutritional scientists such as the German Carl von Voit believed that protein ... urease was in fact a protein. ref name Sumner1926 The first protein to be protein sequencing .... The first protein structure s to be solved were hemoglobin and myoglobin , by Max Perutz and John ... may be protein purification purified from other cellular components using a variety of techniques such as ultracentrifugation .... Methods commonly used to study protein structure and function include immunohistochemistry , site ... more details
S and the protein S C4b binding proteincomplex journal Blood volume 103 issue 4 pages 1192 201 ...PBB geneid 5627 Protein S is a vitamin K dependent plasma glycoprotein synthesized in the endothelium. In the circulation, Protein S exists in two forms a free form and a complex form bound to complement system complement protein C4b. In humans, protein S is encoded by the PROS1 gene . ref name pmid2944113 ... J, Wydro R title Isolation and sequence of the cDNA for human protein S, a regulator of blood coagulation ... in Seattle, Wash, first discovered protein S and arbitrarily named it after the city of its ... title A comparison of human prothrombin, factor IX Christmas factor , factor X Stuart factor , and protein ... of protein S, a gamma carboxyglutamic acid containing protein from bovine and human plasma ... bi00572a026 ref Function The best characterized function of Protein S is its role in the anti coagulation pathway, where it functions as a cofactor to Protein C in the inactivation of factor V Factors ... journal author Castoldi E, Hackeng TM title Regulation of coagulation by protein S journal Curr. Opin ... url ref Protein S can bind to negatively charged phospholipids via the carboxylated Gla domain GLA domain . This property allows Protein S to function in the removal of cells which are undergoing ... membrane. These negatively charged phospholipids are recognized by phagocytes such as macrophages . Protein ... the apoptotic cell and the phagocyte. The bridging property of Protein S enhances the phagocytosis ... occurring. Pathology Mutations in the PROS1 gene can lead to Protein S deficiency ... of, and molecular defects underlying, inherited protein S deficiency in the general population ... Prior P, Hurtado B, Sala N title Molecular basis of protein S deficiency journal Thromb. Haemost ... Protein S has been shown to Proteinprotein interaction interact with Factor V . ref name pmid10593904 ... J, Tans G, Griffin J H year 1999 month Dec. title C terminal residues 621 635 of protein S are essential ... more details
wiktionary complex NOTOC A complex is a whole that comprehends a number of intricate parts, especially one with interconnected or mutually related parts for example, a complex of building s . Complex may refer to Biology ProteincomplexComplex taxonomy , in biology, a cluster of species so closely related that they intergrade, can interbreed, and are difficult to firmly distinguish except at the extremes of their ranges Mimicry complex , a complex system of organisms and dependencies involved in a case of mimicry Chemistry Coordination complex , also called a coordination compound or metal complex ... ligands Chelate complex , a coordination complex with more than one bond Mathematics Complex number , an extension of real numbers obtained by adjoining imaginary number s Complex system , a system ... from which emerges a higher order behavior Complex analysis , the study of functions of complex numbers. An element of a complex algebra or field of sets. Chain complex , a possibly long sequence of maps Simplicial complex , a kind of topological space that can be divided into fully adjacent triangles, or more generally, into simplices CW complex , or closure finite weak complex, a kind of topological space, a generalization of the simplicial complex Line complex , a 3 dimensional family of lines in space. Other scientific uses Complex psychology , a group of mental factors that are unconsciously ... and behavior Synonym for a complex system which generally includes all interactions between elements As a name Complex band Complex magazine Complex magazine CoMPLEX ucl CoMPLEX is an interdisciplinary centre at University College London into biology and biomedicine. See also The Complex disambiguation Complexity Complexity disambiguation Complexity theory disambiguation Theory of complex systems The Military industrial complex disambig cs Komplex da Kompleks de Komplex eo Komplekso es Complejo fr Complexe id Kompleks he ka nl Complex ja no Kompleks pl Kompleks ... more details
The Complex may refer to The Complex An Insider Exposes the Covert World of the Church of Scientology , 2008 book by John Duignan The Complex How the Military Invades Our Everyday Lives , 2008 book by Nick Turse The Complex album The Complex album , by Blue Man Group The Complex Valdosta, Georgia , a multi purpose arena See also Complex disambiguation disambig ... more details
Dodecameric is a term pertaining to protein quaternary structure , and describes a proteincomplex with 12 protein subunits protein chain s . Dodecameric complexes can have a number of Protein subunit subunit topology topologies , but typically only a few of the theory theoretically possible subunit arrangement s are observed in protein structure s. A dodecamer is a proteincomplex with 12 protein subunits. A common Protein subunit subunit arrangement involves a tetrahedral distribution of subunit protein trimer trimer s or 3 4 Point groups in three dimensions point symmetry . Another observed arrangement of Protein subunit subunits puts two rings of six subunits side by side along the six fold axis or 2 6 point symmetry . Dodecameric proteins include Complete gap junction channel, composed of two hexamers. glutamine synthetase PDB code http www.pdbe.org 2gls 2gls Dodecameric ferritin PDB code http www.pdbe.org 1qgh 1qgh A 42 Amyloid beta 42 References Protein Data Bank The Protein Data Bank PDB http www.ebi.ac.uk msd srv prot int cgi bin piserver The Protein Quaternary Structure Server PQS part of the http www.ebi.ac.uk pdbe PDBe . Category Protein structure biochem stub ... more details
e.g. cancer s . Proteins might interact for a long time to form part of a proteincomplex , a protein may be carrying another protein for example, from cytoplasm to cell nucleus nucleus or vice versa in the case of the nuclear pore importins , or a protein may interact briefly with another protein just to modify it for example, a protein kinase will add a phosphate to a target protein . This modification of proteins can itself change proteinprotein interactions. For example, some proteins ... M, Mann M, Seraphin B 1999 A generic protein purification method for proteincomplex characterization ... last6 S raphin first6 B title A generic protein purification method for proteincomplex characterization ... forms a proteinprotein interaction with the ribonuclease protein. The contacts between the two proteins are shown as coloured patches. 250px Proteinprotein interactions occur when two or more protein s bind together, often to carry out their function biology biological function . Many ... molecular machines that are built from a large number of protein components organised by their proteinprotein interactions. Protein interactions have been studied from the perspectives of biochemistry ... graph theory networks . Indeed, proteinprotein interactions are at the core of the entire ... to the inside of that cell by proteinprotein interactions of the signaling molecules. This process ... while bromodomain s specifically recognise acetylated lysines. In conclusion, proteinprotein interactions ... approaches. Methods to investigate proteinprotein interactions Main Methods to investigate proteinprotein interactions As proteinprotein interactions are so important there are a multitude of methods ... hybrid screening can be used to detect novel proteinprotein interactions. There are also many biophysical ... represents a protein and each blue line between them is an interaction. 200px Visualization of proteinprotein interaction networks is a popular application of scientific visualization techniques. Although ... more details
pairs or groups of proteins. Understanding proteinprotein interaction s is important for the investigation of intracellular signaling pathways, modelling of proteincomplex structures and for gaining ... might interact. 3D template based proteincomplex modelling This method ref Aloy ref Chen ref Fukuhara ref Kittichotirat makes use of known proteincomplex structures to predict as well as structurally ... a sequence based method e.g Interolog to search for proteincomplex structures that are homologous ... for this method to makes a prediction is limited to a relatively small number of known proteincomplex ... a server to predict interacting protein pairs and interacting sites by homology modeling of complex ... to use computational methods to predict complexproteinprotein interaction s. Understanding ...Expert subject Biology date November 2008 Proteinprotein interaction prediction is a field combining ... screening two hybrid systems, protein fragment complementation assays PCA , affinity purification mass spectrometry , protein microarray s, fluorescence resonance energy transfer FRET and Microscale ... proteins have fused orthologues in other organisms. In addition, a number of bound protein ... profiling ref Pellegrini finds pairs of protein families with similar patterns of presence ... process, but does not necessarily imply physical interaction. Prediction of co evolved protein ... distance matrices are calculated for each protein in the hypothesized interacting pair. If the matrices ... ref Aloy consists of searching whether the two sequences have homologues which form a complex in a database ... against domain databases such as Pfam using BLAST . If more than one complex of Pfam domains is identified ... the contact residues of the known complex are conserved in the alignment. Identification of structural patterns This method ref Aytuna ref Ogmen builds a library of known proteinprotein interfaces from the Protein Data Bank PDB , where the interfaces are defined as pairs of polypeptide fragments ... more details
Unreferenced stub auto yes date December 2009 File 1axc tricolor.png thumb right Assembled human Proliferating Cell Nuclear Antigen PCNA PDB ID 1AXC , a sliding DNA clamp protein that is part of the DNA replication complex and serves as a processivity factor for DNA polymerase. The three individual polypeptide chains that make up the trimer are shown. In biochemistry , a trimer is a macromolecular Complex chemistry complex formed by three, usually covalent bond non covalently bound , macromolecule s like protein s or nucleic acid s. A homo trimer would be formed by three identical molecule s. A hetero trimer would be formed by three different macromolecules. Collagen is an example of homo trimeric protein. See also Protein quaternary structure DEFAULTSORT Protein Trimer Category Proteins Biochem stub sr Proteinski trimer ... more details
Protein crops are crop s that provide substantial protein , a large class of naturally occurring complex combinations of amino acid s. Such crops, including various oilseed s and grain s, are important in meeting the nutrient requirements of farm animal s. EU Common Agricultural Policy designates certain protein crops as eligible for support, such as pea s, field bean s, and sweet lupin s. References CRS article Report for Congress Agriculture A Glossary of Terms, Programs, and Laws, 2005 Edition url http ncseonline.org nle crsreports 05jun 97 905.pdf author Jasper Womach Category Crops ... more details
complex or MHC immune system Immunoglobulin superfamily immunity Globin protein family ...A protein family is a group of evolution arily related protein s, and is often nearly synonymous with gene family . The term protein family should not be confused with Family biology family as it is used ... have similar protein structure three dimensional structures , functions, and significant ... a powerful tool for identifying the members of protein families. Currently, over 60,000 protein ... of protein families, and still counting , Genome Biology 4, 401, 2003. http genomebiology.com 2003 4 2 401 ref although ambiguity in the definition of protein family leads different researchers to wildly varying numbers. Terminology and usage As with many biological terms, the use of protein ... between these situations, Dayhoff introduced the concept of a protein superfamily. ref Dayhoff, M.O., Computer analysis of protein sequences, Fed. Proc. 33, 2314 2316, 1974. ref ref Dayhoff, M.O., McLaughlin, P.J., Barker, W.C., and Hunt, L.T., Evolution of sequences within protein superfamilies,Naturwissenschaften 62, 154 161, 1975. ref ref Dayhoff, M.O., The origin and evolution of protein superfamilies, Fed. Proc. 35, 2132 2138, 1976. ref Other terms such as protein class , protein group , and protein ... exactly how these terms are being used in a particular context. Protein domains and motifs The concept of protein family was conceived at a time when very few protein structures or sequences ... and functional units or Protein domain domains . Due to evolutionary shuffling , different domains in a protein have evolved independently. This has led, in recent years, to a focus on families of protein domains. A number of online resources are devoted to identifying and cataloging such domains see list of links at the end of this article . Regions of each protein have differing functional constraints features critical to the structure and function of the protein . For example, the active ... more details
File Galactose 1 phosphate uridylyltransferase 1GUP.png thumb right Cartoon diagram of a dimer of Escherichia coli galactose 1 phosphate uridylyltransferase GALT in complex with UDP galactose stick models . Potassium, zinc, and iron ions are visible as purple, gray, and bronze colored spheres respectively. In biochemistry , a dimer is a macromolecular Complex chemistry complex formed by two, usually covalent bond non covalently bound , macromolecule s like protein s or nucleic acid s. It is a Protein quaternary structure quaternary structure of a protein. A homo dimer would be formed by two identical molecule s process called homodimerization . A hetero dimer would be formed by two different macromolecules process called heterodimerization . Most dimers in biochemistry are not connected by covalent bond s with the exception of disulfide bridge s. An example of this would be the enzyme reverse transcriptase , which is made of two different amino acid chains. ref cite journal journal J. Med. Chem. year 2006 volume 49 issue 16 pages 4834 4841 doi 10.1021 jm0604575 title Structure Activity Relationships of 2 ,5 Bis O tert butyldimethylsilyl d ribofuranosyl 3 spiro 5 4 amino 1 ,2 oxathiole 2 ,2 dioxide thymine Derivatives as Inhibitors of HIV 1 Reverse Transcriptase Dimerization author Nicolas Sluis Cremer, Noureddine Hamamouch, Ana San F lix, Sonsoles Vel zquez, Jan Balzarini, and Mar a Jos Camarasa pmid 16884295 ref Some proteins contain specialized domains to ensure dimerization dimerization domains . Examples Antibody Antibodies Receptor tyrosine kinase s Transcription factor s Leucine zipper motif proteins Nuclear receptor s 14 3 3 protein s G protein coupled receptor s G protein subunit dimer Kinesin Triosephosphateisomerase TIM Alcohol dehydrogenase Factor XI Factor XIII Toll like receptor Fibrin ogen References reflist See also Dimer Protein trimer DEFAULTSORT Protein dimer Category Proteins Biochem stub es D mero biolog a sr Proteinski dimer ... more details
. One method of production involves isolation of a specific protein from a virus and administering this by itself ... vaccine , which involves putting a protein gene from the targeted virus into another virus. The second virus will express the protein, but will not present a risk to the patient. This is the type ... Allostery Cooperative binding Cooperativity References reflist Vaccines Category Protein structure cs Podjednotka de Protein Untereinheit es Subunidad Proteica it Subunit ja ru ... more details
A secretory protein is any protein, whether it be endocrine or exocrine , which is secreted by a cell. Secretory proteins include many hormones , enzymes , toxins , and antimicrobial peptides . secretory proteins are synthesized in endoplasmic reticulum. Production The production of a secretory protein starts like any other protein. The Messenger RNA mRNA is produced and transported to the cytosol where it interacts with a free cytosolic ribosome . The part that is produced first, the NH sub 3 sub ter, contains a signal sequence consisting of 6 to 12 amino acid s with hydrophobic side chains. This sequence is recognised by a cytosolic protein, SRP Signal Recognition Particle , which stops the Translation genetics translation and aids in the transport of the mRNA ribosome complex to a translocon in the Cell membrane membrane of the endoplasmic reticulum . When it arrives at the translocon , this channel protein opens and the signal sequence is introduced to the endoplasmic reticulum ER lumen through this opening. The signal sequence is removed and the translation continues while the produced chain moves through the translocon cotranslational translocation . Modification After the production of the protein is completed, it interacts with several other proteins to gain its final state. Endoplasmic Reticulum After translation proteins within the ER make sure that the protein is folded ... too the protein is exported to the cytosol and labelled for destruction. Aside from the folding, there is also a sugar chain added to the protein. After these changes, the protein is transported to the golgi apparatus by a coated Vesicle biology and chemistry vesicle using coating protein ... certain sugars. The secretory protein leaves the golgi apparatus by an uncoated vesicle. Excretion ... and so the protein leaves the cell. Some vesicles don t fuse immediately and await a signal before ... 3D structures of secreted peptides and proteins that interact with lipid bilayer protein stub Category ... more details
InterPro IPR002208 SMART PROSITE PDOC00612 SCOP 1rh5 TCDB 3.A.5 OPM family 19 OPM protein 1rh5 PDB PDB3 1rh5 A 69 417 PDB3 1rhz A 69 417 The SecY protein is the main transmembrane subunit of the eubacterial protein secretory pathway and a protein secreting ATPase complex, also known as a translocon ... a chaperone protein SecB , an ATPase SecA , an integral membrane complex SecY, SecE and SecG , and two ... I title Three dimensional structure of the bacterial protein translocation complex SecYEG journal ...Pfam box Symbol SecY Name eubacterial secY protein image PDB 1rh5 EBI.jpg width caption Structure of a protein ... I, et al. title X ray structure of a protein conducting channel journal Nature volume 427 ... targeted to the outer membrane, or remain as periplasmic proteins. The translocase protein subunits ... SecD and SecF ref name PUB00007064 . The chaperone protein SecB ref name PUB00007065 cite journal ... homotetrameric protein that exists as a dimer of dimers in the bacterial cytoplasm. SecB maintains ... protein ATPase SecA for secretion ref name PUB00007066 cite journal author Muller JP title Effects of pre protein overexpression on SecB synthesis in Escherichia coli journal FEMS Microbiol. Lett. volume ... membrane is composed of dimers of SecYEG. The monomeric complex contains 15 transmembrane helices. The eubacterial secY protein ref name PUB00003823 cite journal doi 10.1111 j.1365 2958.1992.tb01417.x author Ito K title SecY and integral membrane components of the Escherichia coli protein translocation ... interacts with the signal sequences of secretory proteins as well as with two other components of the protein translocation system secA and secE. SecY is an integral plasma membrane protein of 419 to 492 ... domains may participate in protein export ref name PUB00003801 cite journal author Oliver DB, Suh ... evidence for a common protein export pathway in eubacteria journal Mol. Microbiol. volume 4 issue ... 80029 G ref where it could be involved in a prokaryotic like protein export system across the two ... more details
Protein database may refer to Any protein structure database Any protein sequence database Exact names Protein NIH Protein database of the National Institute of Health Protein Database of Bio Synthesis, Inc. disambig ... more details
Orphan date February 2009 Unreferenced date March 2008 A protein skimmer is a device that extracts protein and other organic matter from water. Protein skimmers work on the principle that complex molecules are caught in small bubbles. Therefore, in skimmers powered only by air, a lime wood airstone is used because they provide the finest bubble stream. The bubbles are released into a submerged tube, which is topped with a Venturi scrubber Venturi valve . This helps the smaller bubbles flow out of the top of the valve more easily. The venturi valve is surrounded by a cup, so when the small bubbles overflow the Venturi valve, they fall into the cup. There, the bubbles degrade and the organic waste matter is left. Category Water treatment technology stub ... more details
Orphan date February 2009 In protein structure , STRIDE Str uctural ide ntification is an algorithm for the assignment of protein secondary structure elements given the atomic coordinates of the protein, as defined by X ray crystallography , protein NMR , or another protein structure determination method. In addition to the hydrogen bond criteria used by the more common DSSP protein DSSP algorithm, the STRIDE assignment criteria also include dihedral angle potentials. As such, its criteria for defining individual secondary structures are more complex than those of DSSP. The STRIDE potential function energy function contains a hydrogen bond term containing a Lennard Jones potential Lennard Jones like 8 6 distance dependent potential and two angular dependence factors reflecting the planar ity of the optimized hydrogen bond geometry. The criteria for individual secondary structural elements, which are divided into the same groups as those reported by DSSP, also contain statistical probability factors derived from empirical examinations of solved structures with visually assigned secondary structure elements extracted from the Protein Data Bank . Although DSSP is the older method and continues to be the most commonly used, the original STRIDE definition reported it to give a more satisfactory structural assignment in at least 70 of cases. In particular, STRIDE was observed to correct for the propensity of DSSP to assign shorter secondary structures than would be assigned by an expert crystallographer, usually due to the minor local variations in structure that are most common near ... based protein secondary structure assignment. Proteins 23 4 566 79. DOI 10.1002 prot.340230412 ... name Martin Martin J, Letellier G, Marin A, Taly JF, de Brevern AG, Gibrat JF. 2005 . Protein secondary ... S. 2002 . Occurrence, conformational features and amino acid propensities for the pi helix. Protein ... Category Protein structure ... more details
Protein purification is a series of processes intended to isolate a single type of protein from a complex mixture. Protein purification is vital for the characterization of the function, structure and interactions of the protein of interest. The starting material is usually a biological tissue or a microbial culture. The various steps in the purification process may free the protein from a matrix that confines it, separate the protein and non protein parts of the mixture, and finally separate the desired protein from all other proteins. Separation of one protein from all others is typically the most laborious aspect of protein purification. Separation steps may exploit differences in for example protein size, physico chemical properties, binding affinity and biological activity. Purpose Purification ... products such as enzymes e.g. lactase , nutritional proteins e.g. soy protein isolate , and certain biopharmaceutical s e.g. insulin . Analytical purification produces a relatively small amount of a protein ..., and studies of the Proteins Structure protein s structure , post translational modification s and function ... or animal, a particular protein usually isn t distributed homogeneously throughout the body different organs or tissues have higher or lower concentrations of the protein. Use of only the tissues ... protein. If the protein is present in low abundance, or if it has a high value, scientists ... protein this is known as an expression system . Recombinant expression allows the protein to be tagged ... protein than is present in a natural source. An analytical purification generally utilizes three ... 2D PAGE and are then analysed by peptide mass fingerprinting to establish the protein identity. This is very useful for scientific purposes and the detection limits for protein are nowadays very low and nanogram amounts of protein are sufficient for their analysis. Thirdly, proteins may be separated ... apparent molecular weight . If the protein has a distinguishing Spectroscopy spectroscopic feature ... more details
of the lipid bilayer are indicated by red and blue dots. A membrane protein is a protein molecule ... biological functions. Protein Structural proteins Structural protein s are attached to microfilament .... Transport protein s play an important role in the maintenance of concentrations of ion s. These transport proteins come in two forms carrier protein s and channel protein s. Main categories Membrane ... , external but bound with noncovalent bonds Lipid anchored protein , external but bound with covalent ... exist in two alternative states a water soluble and a lipid bilayer bound. The amphitropic protein ... membrane proteins Integral membrane protein s are permanently attached to the membrane. They can be defined ... with the bilayer Integral polytopic protein s, also known as transmembrane proteins, are proteins ... monotopic protein s are proteins that are permanently attached to the lipid membrane from only one side and do not span across the membrane. Peripheral membrane proteins Peripheral membrane protein ... structure to different membrane types ref Membrane Protein Complexes Membrane Proteins commonly function .... Reoccurring in recent literature are the ideas that membrane protein complexes assemble in an orderly ... can be interchanged in existing complexes. Membrane protein complexes assemble through the orderly assembly of intermediates. For example, the simple membrane embedded four subunit complex, cytochrome ... they could cause. Membrane protein complexes are not fixed entities. Though a process called dynamic exchange, membrane proteins are exchanged in and out of exsitisting protein complexes. This has ... Protein Structures The structures of membrane proteins are stabilized by weak interactions and influenced ... on membrane protein structures is especially significant. Despite the significant functional importance ... number of membrane protein structures determined. Integral membrane proteins are present in a heterogeneous ... of the successful membrane protein structures are characterized by X ray crystallography and are very ... more details
Pasha , also known as DGCR8 , is a protein localized to the cell nucleus that is required for microRNA processing. It binds to Drosha , an RNase III enzyme , to form the Microprocessor complex that cleaves a primary transcript known as pri miRNA to a characteristic stem loop structure known as a pre miRNA, which is then further processed to miRNA fragments by the enzyme Dicer . Pasha contains an RNA binding domain and is thought to bind pri miRNA to stabilize it for processing by Drosha. Category Proteins Category MicroRNA ... more details
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