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'''10 September 2017:''' ''Sussing-out starch recognition in CBM58:'' We are excited to report that '''[[User:Nicole Koropatkin|Nicole Koropatkin]]''' has completed the '''[[Carbohydrate Binding Module Family 58]]''' page today.  [[CBM58]] constitutes a comparatively small family of CBMs found in bacteria in the phylum Bacteroidetes, including key members of the human gut microbiota such as ''Bacteroides thetaiotaomicron''.  Within these bacteria, [[CBM58]] modules are found inserted within the [[GH13]] catalytic module of SusG, the essential outer-membrane-bound amylase of the starch utilization system (sus).  [[User:Nicole Koropatkin|Nicole’s]] seminal structural biology has defined the family and provided insight into the recognition of amylose helices by [[CBM58]] members in SusG homologs.  ''Read more about this fascinating system [[Carbohydrate Binding Module Family 58|here]].''    
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'''19 July 2024:''' ''Chalk-up one more for the GTs!'' The '''[[Glycosyltransferase Family 47]]''' page joined the small group of [[Curator Approved]] [[Glycosyltransferase Families]] pages in ''CAZypedia'' today. This entry was [[author]]ed by Ph.D. students '''[[User:Daniel Tehrani|Daniel Tehrani]]''' and '''[[User:Charlie Corulli|Charlie Corulli]]''', and [[Responsible Curator|Curated]] by '''[[User:Breeanna Urbanowicz|Breeanna Urbanowicz]]''' with input from '''[https://ccrc.uga.edu/team/kelley-moremen/ Kelley Moremen]'''.  Widely represented in plants, '''[[GT47]]''' members are anomer-[[inverting]] [[glycosyltransferases]], which are involved in the biosynthesis of several cell wall matrix polysaccharides.  Representatives from mammals are involved in heparin biosynthesisCorrespondingly, members of [[GH47]] have diverse substrate specificities, including the transfer of both anionic and neutral monosaccharides to polysaccharides.  ''This is a great example where two keen Ph.D. students worked with their supervisors to create a valuable page for the scientific community. We encourage others to follow their lead, on your favorite family!''
 
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'''10 April 2017:''' ''A classic GH family:'' The '''[[Glycoside Hydrolase Family 22]]''' page was completed today by '''[[User:Spencer Williams|Spencer Williams]]''', with editorial input from [[Responsible Curator]] '''[[User:David Vocadlo|David Vocadlo]]'''. '''[[GH22]]''' contains the classic bacterial peptidoglycan hydrolase, hen egg-white lysozyme (HEWL), the first enzyme for which the three-dimensional structure was solved (reported in 1965). Moreover, seminal enzyme-carbohydrate complex structures have made HEWL a paradigm for glycosidases that operate through the [[classical Koshland retaining mechanism]].  Although the nature of the reaction intermediate remained contentious for many years since the original proposal of an oxacarbenium ion-carboxylate pair, a definitive study by  [[User:David Vocadlo|Vocadlo]], [[User:Gideon Davies|Davies]], Laine, and [[User:Steve Withers|Withers]] resolved the covalent nature of the glycosyl-enzyme HEWL in 2001, thus bringing mechanistic understanding of this classic enzyme in concordance with other [[retaining]] GH families.  The lysozyme fold of HEWL defines the archetype for other hexosaminidases (i.e. those of [[GH19]] and [[GH23]]) and the non-catalytic alpha-lactalbumins, and this fold notably has also been observed in recently emergent families of cellulases ([[GH124]]) and mannanases ([[GH134]]).  ''Find out more about this classic GH family  [[Glycoside Hydrolase Family 22|here]]!''
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'''9 July 2024:''' ''Yet another new family of beta-1,2-glucan-active enzymes!'' Today, '''[[User:Masahiro Nakajima|Masahiro Nakajima]]''' [[Curator Approved]] the '''[[Glycoside Hydrolase Family 186]]''' page by '''[[User:Sei Motouchi|Sei Motouchi]]'''. '''[[GH186]]''' is a family of anomer-[[inverting]] enzymes from bacteria, members of which are specific for beta-1,2-glucans.  Intriguingly, although some [[GH186]] members work as classic [[glycoside hydrolases]], others perform transglycosylation by wrapping the sugar chain around in the active-site, to position the 6-OH group of a terminal glucosyl unit for direct attack.  Also notable, [[GH186]] members appear to use an extended chain of water molecules to relay acceptor deprotonation by the [[general base]] residue, ''i.e.'' a [https://en.wikipedia.org/wiki/Grotthuss_mechanism Grotthuss mechanism]. ''Check out the '''[[GH186]]''' page to learn more about these interesting enzymes, and make sure to see the [[GH189]], [[GH144]], and [[GH162]] pages from this same group.''
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'''2 May 2024:''' ''CBDs I to X... A major milestone!'' '''CBM families 1 to 10 are now complete!''' These are the old CBD (cellulose-binding domain) families, which used to have roman numerals as part of their nomenclature. A special thank you to all the authors and responsible curators who have contributed to this major milestone. Go have a peek at each of these old school families on their respective ''CAZypedia'' pages: '''[[CBM1]], [[CBM2]], [[CBM3]], [[CBM4]], [[CBM5]], [[CBM6]], [[CBM7]], [[CBM8]], [[CBM9]], and [[CBM10]]'''.
 
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Latest revision as of 09:56, 22 July 2024

19 July 2024: Chalk-up one more for the GTs! The Glycosyltransferase Family 47 page joined the small group of Curator Approved Glycosyltransferase Families pages in CAZypedia today. This entry was authored by Ph.D. students Daniel Tehrani and Charlie Corulli, and Curated by Breeanna Urbanowicz with input from Kelley Moremen. Widely represented in plants, GT47 members are anomer-inverting glycosyltransferases, which are involved in the biosynthesis of several cell wall matrix polysaccharides. Representatives from mammals are involved in heparin biosynthesis. Correspondingly, members of GH47 have diverse substrate specificities, including the transfer of both anionic and neutral monosaccharides to polysaccharides. This is a great example where two keen Ph.D. students worked with their supervisors to create a valuable page for the scientific community. We encourage others to follow their lead, on your favorite family!


9 July 2024: Yet another new family of beta-1,2-glucan-active enzymes! Today, Masahiro Nakajima Curator Approved the Glycoside Hydrolase Family 186 page by Sei Motouchi. GH186 is a family of anomer-inverting enzymes from bacteria, members of which are specific for beta-1,2-glucans. Intriguingly, although some GH186 members work as classic glycoside hydrolases, others perform transglycosylation by wrapping the sugar chain around in the active-site, to position the 6-OH group of a terminal glucosyl unit for direct attack. Also notable, GH186 members appear to use an extended chain of water molecules to relay acceptor deprotonation by the general base residue, i.e. a Grotthuss mechanism. Check out the GH186 page to learn more about these interesting enzymes, and make sure to see the GH189, GH144, and GH162 pages from this same group.


2 May 2024: CBDs I to X... A major milestone! CBM families 1 to 10 are now complete! These are the old CBD (cellulose-binding domain) families, which used to have roman numerals as part of their nomenclature. A special thank you to all the authors and responsible curators who have contributed to this major milestone. Go have a peek at each of these old school families on their respective CAZypedia pages: CBM1, CBM2, CBM3, CBM4, CBM5, CBM6, CBM7, CBM8, CBM9, and CBM10.