5XW7 image
Deposition Date 2017-06-29
Release Date 2017-11-01
Last Version Date 2024-03-27
Entry Detail
PDB ID:
5XW7
Title:
Crystal structure of the flexible tandem repeat domain of bacterial cellulose synthase subunit C
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
3.27 Å
R-Value Free:
0.25
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 1 21 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Cellulose synthase subunit C
Gene (Uniprot):bcsC
Chain IDs:A, B, C, D, E
Chain Length:260
Number of Molecules:5
Biological Source:Enterobacter sp. CJF-002
Ligand Molecules
Primary Citation
Crystal structure of the flexible tandem repeat domain of bacterial cellulose synthesis subunit C
Sci Rep 7 13018 13018 (2017)
PMID: 29026093 DOI: 10.1038/s41598-017-12530-0

Abstact

Bacterial cellulose (BC) is synthesized and exported through the cell membrane via a large protein complex (terminal complex) that consists of three or four subunits. BcsC is a little-studied subunit considered to export BC to the extracellular matrix. It is predicted to have two domains: a tetratrico peptide repeat (TPR) domain and a β-barrelled outer membrane domain. Here we report the crystal structure of the N-terminal part of BcsC-TPR domain (Asp24-Arg272) derived from Enterobacter CJF-002. Unlike most TPR-containing proteins which have continuous TPR motifs, this structure has an extra α-helix between two clusters of TPR motifs. Five independent molecules in the crystal had three different conformations that varied at the hinge of the inserted α-helix. Such structural feature indicates that the inserted α-helix confers flexibility to the chain and changes the direction of the TPR super-helix, which was also suggested by structural analysis of BcsC-TPR (Asp24-Leu664) in solution by size exclusion chromatography-small-angle X-ray scattering. The flexibility at the α-helical hinge may play important role for exporting glucan chains.

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