3ZWU image
Entry Detail
PDB ID:
3ZWU
Keywords:
Title:
Pseudomonas fluorescens PhoX in complex with vanadate, a transition state analogue
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2011-08-02
Release Date:
2012-08-08
Method Details:
Experimental Method:
Resolution:
1.39 Å
R-Value Free:
0.17
R-Value Work:
0.15
R-Value Observed:
0.15
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:ALKALINE PHOSPHATASE PHOX
Chain IDs:A, B
Chain Length:592
Number of Molecules:2
Biological Source:PSEUDOMONAS FLUORESCENS
Primary Citation
A Complex Iron-Calcium Cofactor Catalyzing Phosphotransfer Chemistry
Science 345 1170 ? (2014)
PMID: 25190793 DOI: 10.1126/SCIENCE.1254237

Abstact

Alkaline phosphatases play a crucial role in phosphate acquisition by microorganisms. To expand our understanding of catalysis by this class of enzymes, we have determined the structure of the widely occurring microbial alkaline phosphatase PhoX. The enzyme contains a complex active-site cofactor comprising two antiferromagnetically coupled ferric iron ions (Fe(3+)), three calcium ions (Ca(2+)), and an oxo group bridging three of the metal ions. Notably, the main part of the cofactor resembles synthetic oxide-centered triangular metal complexes. Structures of PhoX-ligand complexes reveal how the active-site metal ions bind substrate and implicate the cofactor oxo group in the catalytic mechanism. The presence of iron in PhoX raises the possibility that iron bioavailability limits microbial phosphate acquisition.

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Primary Citation of related structures