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
Withers SG
中科院分区:
生物学3区
文献类型:
--
作者:
Thompson J;Pikis A;Rich J;Hall BG;Withers SG

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家族 4 糖苷酶 LplD 蛋白(其活性位点基序为 CHEV)的催化活性尚不清楚,尽管其晶体结构已于 2008 年确定。在这里,我们将该活性鉴定为 α-半乳糖醛酸酶,其天然底物可能是 α-1, 4-二-半乳糖醛酸 (GalUA2)。系统发育分析表明,LplD 属于 CHEV 家族 4 酶的单系进化枝,其中其他四个成员也被证明是半乳糖醛酸酶。 GH 4 家族酶通过与 Koshland 的双置换机制相反的非规范氧化还原辅助机制催化糖苷键的裂解。
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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