6CF8 image
Deposition Date 2018-02-13
Release Date 2018-05-30
Last Version Date 2024-11-06
Entry Detail
PDB ID:
6CF8
Keywords:
Title:
Crystal structure of Cj0843 lytic transglycosylase of Campylobacter jejuni at 1.87A resolution
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.87 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 31 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Lytic transglycosylase
Chain IDs:A
Chain Length:524
Number of Molecules:1
Biological Source:Campylobacter jejuni
Ligand Molecules
Primary Citation
Structural studies and molecular dynamics simulations suggest a processive mechanism of exolytic lytic transglycosylase from Campylobacter jejuni.
PLoS ONE 13 e0197136 e0197136 (2018)
PMID: 29758058 DOI: 10.1371/journal.pone.0197136

Abstact

The bacterial soluble lytic transglycosylase (LT) breaks down the peptidoglycan (PG) layer during processes such as cell division. We present here crystal structures of the soluble LT Cj0843 from Campylobacter jejuni with and without bulgecin A inhibitor in the active site. Cj0843 has a doughnut shape similar but not identical to that of E. coli SLT70. The C-terminal catalytic domain is preceded by an L-domain, a large helical U-domain, a flexible linker, and a small N-terminal NU-domain. The flexible linker allows the NU-domain to reach over and complete the circular shape, using residues conserved in the Epsilonproteobacteria LT family. The inner surface of the Cj0843 doughnut is mostly positively charged including a pocket that has 8 Arg/Lys residues. Molecular dynamics simulations with PG strands revealed a potential functional role for this pocket in anchoring the negatively charged terminal tetrapeptide of the PG during several steps in the reaction including homing and aligning the PG strand for exolytic cleavage, and subsequent ratcheting of the PG strand to enhance processivity in degrading PG strands.

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