+検索条件
-Structure paper
タイトル | Insights into SusCD-mediated glycan import by a prominent gut symbiont. |
---|---|
ジャーナル・号・ページ | Nat Commun, Vol. 12, Issue 1, Page 44, Year 2021 |
掲載日 | 2021年1月4日 |
著者 | Declan A Gray / Joshua B R White / Abraham O Oluwole / Parthasarathi Rath / Amy J Glenwright / Adam Mazur / Michael Zahn / Arnaud Baslé / Carl Morland / Sasha L Evans / Alan Cartmell / Carol V Robinson / Sebastian Hiller / Neil A Ranson / David N Bolam / Bert van den Berg / |
PubMed 要旨 | In Bacteroidetes, one of the dominant phyla of the mammalian gut, active uptake of large nutrients across the outer membrane is mediated by SusCD protein complexes via a "pedal bin" transport ...In Bacteroidetes, one of the dominant phyla of the mammalian gut, active uptake of large nutrients across the outer membrane is mediated by SusCD protein complexes via a "pedal bin" transport mechanism. However, many features of SusCD function in glycan uptake remain unclear, including ligand binding, the role of the SusD lid and the size limit for substrate transport. Here we characterise the β2,6 fructo-oligosaccharide (FOS) importing SusCD from Bacteroides thetaiotaomicron (Bt1762-Bt1763) to shed light on SusCD function. Co-crystal structures reveal residues involved in glycan recognition and suggest that the large binding cavity can accommodate several substrate molecules, each up to ~2.5 kDa in size, a finding supported by native mass spectrometry and isothermal titration calorimetry. Mutational studies in vivo provide functional insights into the key structural features of the SusCD apparatus and cryo-EM of the intact dimeric SusCD complex reveals several distinct states of the transporter, directly visualising the dynamics of the pedal bin transport mechanism. |
リンク | Nat Commun / PubMed:33398001 / PubMed Central |
手法 | EM (単粒子) / NMR (溶液) / X線回折 |
解像度 | 2.62 - 4.7 Å |
構造データ | EMDB-11273, PDB-6zlt: EMDB-11274, PDB-6zlu: EMDB-11277, PDB-6zm1: PDB-6ytc: PDB-6z8i: PDB-6z9a: PDB-6zaz: |
化合物 | ChemComp-MG: ChemComp-PO4: ChemComp-HOH: ChemComp-CL: ChemComp-C8E: |
由来 |
|
キーワード | PROTEIN TRANSPORT / Glycan import / Transporter / N-terminal Domain / Ig-like fold / MEMBRANE PROTEIN / Outer membrane protein TonB-dependent transporter SusC SusD Levan Bacteroides thetaiotaomicron / SusCD / Levan / TonB-dependent |