6YG8

Cryo-EM structure of a BcsB pentamer in the context of an assembled Bcs macrocomplex

Summary for 6YG8

• Entry DOI: 10.2210/pdb6yg8/pdb
• Related: 6TJ0 6YAR 6YAY 6YB3 6YB5 6YBB 6YBU
• EMDB information: 10799 11356 11836
• Descriptor: Bacterial cellulose secretion regulator BcsB (1 entity in total)
• Functional Keywords: bacterial biofilms, bacterial cellulose, bacterial secretion system, regulator protein, signaling protein
• Biological source: Escherichia coli
• Total number of polymer chains: 5
• Total formula weight: 430921.92

Authors

Zouhir, S.,Krasteva, P.V. (deposition date: 2020-03-27, release date: 2021-02-24)

Primary citation

Abidi, W.,Zouhir, S.,Caleechurn, M.,Roche, S.,Krasteva, P.V.
Architecture and regulation of an enterobacterial cellulose secretion system.
Sci Adv, 7:-, 2021

PubMed Abstract: Many free-living and pathogenic enterobacteria secrete biofilm-promoting cellulose using a multicomponent, envelope-embedded Bcs secretion system under the control of intracellular second messenger c-di-GMP. The molecular understanding of system assembly and cellulose secretion has been largely limited to the crystallographic studies of a distantly homologous BcsAB synthase tandem and a low-resolution reconstruction of an assembled macrocomplex that encompasses most of the inner membrane and cytosolic subunits and features an atypical layered architecture. Here, we present cryo-EM structures of the assembled Bcs macrocomplex, as well as multiple crystallographic snapshots of regulatory Bcs subcomplexes. The structural and functional data uncover the mechanism of asymmetric secretion system assembly and periplasmic crown polymerization and reveal unexpected subunit stoichiometry, multisite c-di-GMP recognition, and ATP-dependent regulation.

PubMed: 33563593
DOI: 10.1126/sciadv.abd8049

Experimental method

ELECTRON MICROSCOPY (3 Å)