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Auxiliary Activity Family 9
Auxiliary Activity family 9 (formerly GH61) is a family of lytic polysaccharide monooxygenases. The family was previously incorrectly classified as glycoside hydrolase family 61, however it was re-classified in March 2013. AA9 is known to be a copper dependent, oxidative enzyme able to cleave crystalline cellulose. Activity greatly depends on the presence of a divalent copper ion and a reductant such as gallate or ascorbate. The oxidative action of AA9 can work on either the reducing or the non-reducing end of glucose moieties. Although AA9 enzymes can be found in a large spectrum of biomass degrading fungi, research into this family is relatively new. This classification is available on the CAZy web site, and also discussed at CAZypedia, an online encyclopedia of carbohydrate active enzymes. References {{Portal bar, Biology, border=no EC 3.2.1 Glycoside hydrolase families Protein families ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Protein Family
A protein family is a group of evolutionarily related proteins. In many cases, a protein family has a corresponding gene family, in which each gene encodes a corresponding protein with a 1:1 relationship. The term "protein family" should not be confused with Family (biology), family as it is used in taxonomy. Proteins in a family descend from a common ancestor and typically have similar protein structure, three-dimensional structures, functions, and significant Sequence homology, sequence similarity. The most important of these is sequence similarity (usually amino-acid sequence), since it is the strictest indicator of homology and therefore the clearest indicator of common ancestry. A fairly well developed framework exists for evaluating the significance of similarity between a group of sequences using sequence alignment methods. Proteins that do not share a common ancestor are very unlikely to show statistically significant sequence similarity, making sequence alignment a powerf ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Monooxygenase
Monooxygenases are enzymes that incorporate one hydroxyl group (−OH) into substrates in many metabolic pathways. In this reaction, the two atoms of dioxygen are reduced to one hydroxyl group and one H2O molecule by the concomitant oxidation of NAD(P)H. One important subset of the monooxygenases, the cytochrome P450 omega hydroxylases, is used by cells to metabolize arachidonic acid (i.e. eicosatetraenoic acid) to the cell signaling molecules, 20-hydroxyeicosatetraenoic acid or to reduce or totally inactivate the activate signaling molecules for example by hydroxylating leukotriene B4 to 20-hydroxy-leukotriene B5, 5-hydroxyeicosatetraenoic acid to 5,20-dihydroxyeicosatetraenoic acid, 5-oxo-eicosatetraenoic acid to 5-oxo-20-hydroxyeicosatetraenoic acid, 12-hydroxyeicosatetraenoic acid to 12,20-dihydroxyeicosatetraenoic acid, and epoxyeicosatrienoic acids to 20-hydroxy-epoxyeicosatrienoic acids. Classification They are classified as oxidoreductase enzymes that catalyzes an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CAZy
CAZy is a database of Carbohydrate-Active enZYmes (CAZymes). The database contains a classification and associated information about enzymes involved in the synthesis, metabolism, and recognition of complex carbohydrates, i.e. disaccharides, oligosaccharides, polysaccharides, and glycoconjugates. Included in the database are families of glycoside hydrolases, glycosyltransferases, polysaccharide lyases, carbohydrate esterases, and non-catalytic carbohydrate-binding modules. The CAZy database also includes a classification of Auxiliary Activity redox enzymes involved in the breakdown of lignocellulose. CAZy was established in 1999 in order to provide online and constantly updated access to the protein sequence-based family classification of CAZymes, which was originally developed in early 1990s to classify the glycoside hydrolases. New entries are added shortly after they appear in the daily releases of GenBank. The rapid evolution of high-throughput DNA sequencing has resulted i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Glycoside Hydrolase Families
There are many characterised protein families with Glycoside hydrolase activity . These enzymes hydrolyse the glycosidic bond between two or more carbohydrates, or between a carbohydrate and a non-carbohydrate moiety. Families are defined based on their sequence similarity. This classification is available on the CAZy CAZy is a database of Carbohydrate-Active enZYmes (CAZymes). The database contains a classification and associated information about enzymes involved in the synthesis, metabolism, and recognition of complex carbohydrates, i.e. disaccharides, olig ... (CArbohydrate-Active EnZymes) web site.{{cite journal, vauthors=Cantarel BL, Coutinho PM, Rancurel C, Bernard T, Lombard V, Henrissat B, date=January 2009, title=The Carbohydrate-Active EnZymes database (CAZy): an expert resource for Glycogenomics, url=, journal=Nucleic Acids Res., volume=37, issue=Database issue, pages=D233–8, doi=10.1093/nar/gkn663, issn=, pmc=2686590, pmid=18838391 Because the fold of proteins is ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
