8TCT

Structure of 3K-GlcH bound Bacteroides thetaiotaomicron 3-Keto-beta-glucopyranoside-1,2-Lyase BT1

8TCT の概要

• エントリーDOI: 10.2210/pdb8tct/pdb
• 関連するPDBエントリー: 8TCD 8TCR 8TCS 8TDA 8TDE 8TDF 8TDH 8TDI 8V31
• 分子名称: Sugar phosphate isomerase/epimerase, 1,5-anhydro-D-ribo-hex-3-ulose, COBALT (II) ION, ... (5 entities in total)
• 機能のキーワード: sugar phosphate isomerase, isomerase
• 由来する生物種: Bacteroides thetaiotaomicron
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 34077.70

構造登録者

Lazarski, A.C.,Worrall, L.J.,Strynadka, N.C.J. (登録日: 2023-07-02, 公開日: 2024-06-12, 最終更新日: 2024-07-17)

主引用文献

Nasseri, S.A.,Lazarski, A.C.,Lemmer, I.L.,Zhang, C.Y.,Brencher, E.,Chen, H.M.,Sim, L.,Panwar, D.,Betschart, L.,Worrall, L.J.,Brumer, H.,Strynadka, N.C.J.,Withers, S.G.
An alternative broad-specificity pathway for glycan breakdown in bacteria.
Nature, 631:199-206, 2024

PubMed Abstract: The vast majority of glycosidases characterized to date follow one of the variations of the 'Koshland' mechanisms to hydrolyse glycosidic bonds through substitution reactions. Here we describe a large-scale screen of a human gut microbiome metagenomic library using an assay that selectively identifies non-Koshland glycosidase activities. Using this, we identify a cluster of enzymes with extremely broad substrate specificities and thoroughly characterize these, mechanistically and structurally. These enzymes not only break glycosidic linkages of both α and β stereochemistry and multiple connectivities, but also cleave substrates that are not hydrolysed by standard glycosidases. These include thioglycosides, such as the glucosinolates from plants, and pseudoglycosidic bonds of pharmaceuticals such as acarbose. This is achieved through a distinct mechanism of hydrolysis that involves oxidation/reduction and elimination/hydration steps, each catalysed by enzyme modules that are in many cases interchangeable between organisms and substrate classes. Homologues of these enzymes occur in both Gram-positive and Gram-negative bacteria associated with the gut microbiome and other body parts, as well as other environments, such as soil and sea. Such alternative step-wise mechanisms appear to constitute largely unrecognized but abundant pathways for glycan degradation as part of the metabolism of carbohydrates in bacteria.

PubMed: 38898276
DOI: 10.1038/s41586-024-07574-y

実験手法

X-RAY DIFFRACTION (1.86 Å)