4Q8R image
Deposition Date 2014-04-28
Release Date 2014-11-05
Last Version Date 2023-09-20
Entry Detail
PDB ID:
4Q8R
Title:
Crystal structure of a Phosphate Binding Protein (PBP-1) from Clostridium perfringens
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.65 Å
R-Value Free:
0.17
R-Value Work:
0.13
R-Value Observed:
0.13
Space Group:
F 2 2 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Phosphate ABC transporter, phosphate-binding protein
Chain IDs:A
Chain Length:252
Number of Molecules:1
Biological Source:Clostridium perfringens
Primary Citation
Crystal structure of the phosphate-binding protein (PBP-1) of an ABC-type phosphate transporter from Clostridium perfringens.
Sci Rep 4 6636 6636 (2014)
PMID: 25338617 DOI: 10.1038/srep06636

Abstact

Phosphate limitation is an important environmental stress that affects the metabolism of various organisms and, in particular, can trigger the virulence of numerous bacterial pathogens. Clostridium perfringens, a human pathogen, is one of the most common causes of enteritis necroticans, gas gangrene and food poisoning. Here, we focused on the high affinity phosphate-binding protein (PBP-1) of an ABC-type transporter, responsible for cellular phosphate uptake. We report the crystal structure (1.65 Å resolution) of the protein in complex with phosphate. Interestingly, PBP-1 does not form the short, low-barrier hydrogen bond with phosphate that is typical of previously characterized phosphate-binding proteins, but rather a canonical hydrogen bond. In its unique binding configuration, PBP-1 forms an unusually high number of hydrogen bonds (14) with the phosphate anion. Discrimination experiments reveal that PBP-1 is the least selective PBP characterised so far and is able to discriminate phosphate from its close competing anion, arsenate, by ~150-fold.

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