5F7C

Crystal structure of Family 31 alpha-glucosidase (BT_0339) from Bacteroides thetaiotaomicron

5F7C の概要

• エントリーDOI: 10.2210/pdb5f7c/pdb
• 分子名称: Alpha-glucosidase (2 entities in total)
• 機能のキーワード: family glycoside hydrolase, hydrolase
• 由来する生物種: Bacteroides thetaiotaomicron
• タンパク質・核酸の鎖数: 4
• 化学式量合計: 353881.28

構造登録者

Chaudet, M.M.,Rose, D.R. (登録日: 2015-12-07, 公開日: 2016-02-17, 最終更新日: 2024-03-06)

主引用文献

Chaudet, M.M.,Rose, D.R.
Suggested alternative starch utilization system from the human gut bacterium Bacteroides thetaiotaomicron.
Biochem. Cell Biol., 94:241-246, 2016

PubMed Abstract: The human digestive system is host to a highly populated ecosystem of bacterial species that significantly contributes to our assimilation of dietary carbohydrates. Bacteroides thetaiotaomicron is a member of this ecosystem, and participates largely in the role of the gut microbiome by breaking down dietary complex carbohydrates. This process of acquiring glycans from the colon lumen is predicted to rely on the mechanisms of proteins that are part of a classified system known as polysaccharide utilization loci (PUL). These loci are responsible for binding substrates at the cell outer membrane, internalizing them, and then hydrolyzing them within the periplasm into simple sugars. Here we report our investigation into specific components of a PUL, and suggest an alternative starch utilization system in B. thetaiotaomicron. Our analysis of an outer membrane binding protein, a SusD homolog, highlights its contribution to this PUL by acquiring starch-based sugars from the colon lumen. Through our structural characterization of two Family GH31 α-glucosidases, we reveal the flexibility of this bacterium with respect to utilizing a range of starch-derived glycans with an emphasis on branched substrates. With these results we demonstrate the predicted function of a gene locus that is capable of contributing to starch hydrolysis in the human colon.

PubMed: 27093479
DOI: 10.1139/bcb-2016-0002

実験手法

X-RAY DIFFRACTION (2.6 Å)