α-Galacturonidase(s): a new class of Family 4 glycoside hydrolases with strict specificity and a unique CHEV active site motif.
α-Galacturonidase(s): a new class of Family 4 glycoside hydrolases with strict specificity and a unique CHEV active site motif.
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DOI:
10.1016/j.febslet.2013.02.004
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发表时间:
2013-03-18
期刊:
影响因子:
3.5
通讯作者:
Withers SG
中科院分区:
文献类型:
--
作者:
Thompson J;Pikis A;Rich J;Hall BG;Withers SG
The catalytic activity of the Family 4 glycosidase LplD protein, whose active site motif is CHEV, is unknown despite its crystal structure having been determined in 2008. Here we identify that activity as being an α-galacturonidase whose natural substrate is probably α–1, 4-di-galacturonate (GalUA2). Phylogenetic analysis shows that LplD belongs to a monophyletic clade of CHEV Family 4 enzymes, of which four other members are also shown to be galacturonidases. Family GH 4 enzymes catalyze the cleavage of the glycosidic bond, via a non-canonical redox-assisted mechanism that contrasts with Koshland’s double-displacement mechanism.
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