8X1A image
Entry Detail
PDB ID:
8X1A
Title:
Crystal structure of periplasmic G6P binding protein VcA0625
Biological Source:
Source Organism:
PDB Version:
Deposition Date:
2023-11-06
Release Date:
2024-04-17
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.19
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Iron(III) ABC transporter, periplasmic iron-compound-binding protein
Mutations:A296T
Chain IDs:A (auth: B)
Chain Length:321
Number of Molecules:1
Biological Source:Vibrio cholerae O395
Ligand Molecules
Primary Citation
Structural insights in to the atypical type-I ABC Glucose-6-phosphate importer VCA0625-27 of Vibrio cholerae.
Biochem.Biophys.Res.Commun. 716 150030 150030 (2024)
PMID: 38704889 DOI: 10.1016/j.bbrc.2024.150030

Abstact

Sugar phosphates are potential sources of carbon and phosphate for bacteria. Despite that the process of internalization of Glucose-6-Phosphate (G6P) through plasma membrane remained elusive in several bacteria. VCA0625-27, made of periplasmic ligand binding protein (PLBP) VCA0625, an atypical monomeric permease VCA0626, and a cytosolic ATPase VCA0627, recently emerged as hexose-6-phosphate uptake system of Vibrio cholerae. Here we report high resolution crystal structure of VCA0625 in G6P bound state that largely resembles AfuA of Actinobacillus pleuropneumoniae. MD simulations on VCA0625 in apo and G6P bound states unraveled an 'open to close' and swinging bi-lobal motions, which are diminished upon G6P binding. Mutagenesis followed by biochemical assays on VCA0625 underscored that R34 works as gateway to bind G6P. Although VCA0627 binds ATP, it is ATPase deficient in the absence of VCA0625 and VCA0626, which is a signature phenomenon of type-I ABC importer. Further, modeling, docking and systematic sequence analysis allowed us to envisage the existence of similar atypical type-I G6P importer with fused monomeric permease in 27 other gram-negative bacteria.

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