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Polysaccharide Lyase Family 19
- Responsible Curator: ^^^Bernard Henrissat^^^
PL19 is a deleted family
History
Entries in Glycoside Hydrolase Family 91 were originally reclassified to Polysaccharide Lyase Family 19 on 30 July 2008 due to recommendations of the NC-IUBMB, which stated that these enzymes are lyases, as there is no water involved in the reaction. Indeed, polysaccharide cleavage occurs via intramolecular hydroxide attack, rather than glycosidic bond hydrolysis (see EC 4.2.2.17 and EC 4.2.2.18).
The family was re-reclassified as Glycoside Hydrolase Family 91 on 20 April 2010 due to direct analogy with the lytic transglycosidases of GH23, GH102, GH103, and GH104. Additionally, a hydrolase (di-fructofuranose 1,2':2,3' dianhydride hydrolase, DFA-IIIase) has also been found in this family.
| CAZy DB links | |
| http://www.cazy.org/fam/GH91.html | |
| http://www.cazy.org/fam/PL19.html |
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