7LK7

Structure of the Exo-alpha-L-galactosidase BpGH29 from Bacteroides plebeius in complex with L-galactose

7LK7 の概要

• エントリーDOI: 10.2210/pdb7lk7/pdb
• 分子名称: Exo-alpha-L-galactosidase, CALCIUM ION, alpha-L-galactopyranose, ... (5 entities in total)
• 機能のキーワード: glycoside hydrolase, porphyran, carbohydrate, hydrolase
• 由来する生物種: Bacteroides plebeius
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 68632.63

構造登録者

Boraston, A.B.,Robb, C.S. (登録日: 2021-02-01, 公開日: 2022-02-09, 最終更新日: 2023-10-18)

主引用文献

Robb, C.S.,Hobbs, J.K.,Pluvinage, B.,Reintjes, G.,Klassen, L.,Monteith, S.,Giljan, G.,Amundsen, C.,Vickers, C.,Hettle, A.G.,Hills, R.,Xing, X.,Montina, T.,Zandberg, W.F.,Abbott, D.W.,Boraston, A.B.
Metabolism of a hybrid algal galactan by members of the human gut microbiome.
Nat.Chem.Biol., 18:501-510, 2022

PubMed Abstract: Native porphyran is a hybrid of porphryan and agarose. As a common element of edible seaweed, this algal galactan is a frequent component of the human diet. Bacterial members of the human gut microbiota have acquired polysaccharide utilization loci (PULs) that enable the metabolism of porphyran or agarose. However, the molecular mechanisms that underlie the deconstruction and use of native porphyran remains incompletely defined. Here, we have studied two human gut bacteria, porphyranolytic Bacteroides plebeius and agarolytic Bacteroides uniformis, that target native porphyran. This reveals an exo-based cycle of porphyran depolymerization that incorporates a keystone sulfatase. In both PULs this cycle also works together with a PUL-encoded agarose depolymerizing machinery to synergistically reduce native porphyran to monosaccharides. This provides a framework for understanding the deconstruction of a hybrid algal galactan, and insight into the competitive and/or syntrophic relationship of gut microbiota members that target rare nutrients.

PubMed: 35289327
DOI: 10.1038/s41589-022-00983-y

実験手法

X-RAY DIFFRACTION (2.19 Å)