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| − | '''16 November 2016:''' ''A new plant glycanase with a lysozyme fold:'' '''[[User:Spencer Williams|Spencer Williams]]''' does it again, with the completion of the '''[[Glycoside Hydrolase Family 134]]''' page on a new family of [[inverting]] beta-(gluco)mannanases. This small family emerged in 2015 with the biochemical characterization of an ''Aspergillus nidulans'' (fungal) member. Recently the tertiary structure and detailed catalytic mechanism - including the reaction conformational itinerary - of a ''Streptomyces'' sp. '''[[Glycoside Hydrolase Family 134|GH134]]''' member has been resolved by [[User:Gideon Davies|Gideon Davies]], [[User:Spencer Williams|Spencer Williams]], and their collaborators and co-workers. This is only the second example of a [[glycoside hydrolase]] family that utilizes a lysozyme-like fold as a scaffold for the cleavge of a plant polysaccharide, as opposed to bacterial peptidoglycan; the first, a [[Glycoside Hydrolase Family 124]] cellulase characterized by [[User:Harry Gilbert|Harry Gilbert]] ''et al.'', also uses an [[inverting]] mechanism. | + | '''16 November 2016:''' ''A new plant glycanase with a lysozyme fold:'' '''[[User:Spencer Williams|Spencer Williams]]''' does it again, with the completion of the '''[[Glycoside Hydrolase Family 134]]''' page on a new family of [[inverting]] beta-(gluco)mannanases. This small family emerged in 2015 with the biochemical characterization of an ''Aspergillus nidulans'' (fungal) member. Recently the tertiary structure and detailed catalytic mechanism - including the reaction [[conformational itinerary]] - of a ''Streptomyces'' sp. '''[[Glycoside Hydrolase Family 134|GH134]]''' member has been resolved by [[User:Gideon Davies|Gideon Davies]], [[User:Spencer Williams|Spencer Williams]], and their collaborators and co-workers. This is only the second example of a [[glycoside hydrolase]] family that utilizes a lysozyme-like fold as a scaffold for the cleavge of a plant polysaccharide, as opposed to bacterial peptidoglycan; the first, a [[Glycoside Hydrolase Family 124]] cellulase characterized by [[User:Harry Gilbert|Harry Gilbert]] ''et al.'', also uses an [[inverting]] mechanism. |
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'''3 November 2016:''' ''New PDB links-out:'' For 3-D visualization of exemplar CAZymes and CBMs, we're trying a switch from [http://proteopedia.org/ Proteopedia] to the [https://doi.org/10.1093/nar/gkv402 NGL viewer] implementation at the RCSB Protein Data Bank. We've made this switch site-wide across CAZypedia, and would like to [[Special:Contact|hear any feedback]] you might have. Here's an example for direct comparison: The seminal bacterial cellulose synthase complex [http://proteopedia.org/wiki/index.php/4hg6 in the JSMol viewer at Proteopedia] (including wiki page) and [http://www.rcsb.org/pdb/ngl/ngl.do?pdbid=4HG6 in the NGL viewer at the PDB] (other info available via the page tabs). | '''3 November 2016:''' ''New PDB links-out:'' For 3-D visualization of exemplar CAZymes and CBMs, we're trying a switch from [http://proteopedia.org/ Proteopedia] to the [https://doi.org/10.1093/nar/gkv402 NGL viewer] implementation at the RCSB Protein Data Bank. We've made this switch site-wide across CAZypedia, and would like to [[Special:Contact|hear any feedback]] you might have. Here's an example for direct comparison: The seminal bacterial cellulose synthase complex [http://proteopedia.org/wiki/index.php/4hg6 in the JSMol viewer at Proteopedia] (including wiki page) and [http://www.rcsb.org/pdb/ngl/ngl.do?pdbid=4HG6 in the NGL viewer at the PDB] (other info available via the page tabs). | ||
Revision as of 15:53, 16 November 2016
16 November 2016: A new plant glycanase with a lysozyme fold: Spencer Williams does it again, with the completion of the Glycoside Hydrolase Family 134 page on a new family of inverting beta-(gluco)mannanases. This small family emerged in 2015 with the biochemical characterization of an Aspergillus nidulans (fungal) member. Recently the tertiary structure and detailed catalytic mechanism - including the reaction conformational itinerary - of a Streptomyces sp. GH134 member has been resolved by Gideon Davies, Spencer Williams, and their collaborators and co-workers. This is only the second example of a glycoside hydrolase family that utilizes a lysozyme-like fold as a scaffold for the cleavge of a plant polysaccharide, as opposed to bacterial peptidoglycan; the first, a Glycoside Hydrolase Family 124 cellulase characterized by Harry Gilbert et al., also uses an inverting mechanism.
3 November 2016: New PDB links-out: For 3-D visualization of exemplar CAZymes and CBMs, we're trying a switch from Proteopedia to the NGL viewer implementation at the RCSB Protein Data Bank. We've made this switch site-wide across CAZypedia, and would like to hear any feedback you might have. Here's an example for direct comparison: The seminal bacterial cellulose synthase complex in the JSMol viewer at Proteopedia (including wiki page) and in the NGL viewer at the PDB (other info available via the page tabs).
30 October 2016: Another X-module comes to light: Today Spencer Williams completed the Glycoside Hydrolase Family 135 page, which describes the genesis of a new CAZy family from a small group of modules formerly known as "X307" in the CAZyModO classification. The single biochemically and structurally characterized GH135 member hydrolyzes the unique fungal exo-polysaccharide galactosaminogalactan, with crystallographic evidence suggesting that the enzyme acts as a alpha-galactosaminidase. However, a number of key enzymological questions about this new family remain outstanding, and we look forward to future work in this direction of the CAZyme landscape.
3 September 2016: Galactosaminoglycan degradation: Spencer Williams has just completed a short entry on Glycoside Hydrolase Family 114, a small family of bacterial and fungal sequences currently represented by a single characterized endo-alpha-1,4-polygalactosaminidase. alpha-1,4-Polygalactosamine, also known as galactosaminoglycan, is produced as a secreted polysaccharide by select fungi, including Aspergilli.
27 February 2016: The sweet side of sulfur: Author Spencer Williams has updated the Glycoside Hydrolase Family 31 page to reflect the recent discovery of the first dedicated sulfoquinovosidases (SQases), previously ‘hidden’ within this family. SQases cleave α-glycosides of sulfoquinovose (6-sulfoglucose), which represent a significant reservoir of organosulfur in the biosphere. See the GH31 page to discover more of the hidden charms of this family.