3IAE image
Deposition Date 2009-07-13
Release Date 2010-03-02
Last Version Date 2023-09-06
Entry Detail
PDB ID:
3IAE
Keywords:
Title:
Structure of benzaldehyde lyase A28S mutant with benzoylphosphonate
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.30 Å
R-Value Free:
0.23
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 32 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Benzaldehyde lyase
Gene (Uniprot):bznB
Mutations:A28S
Chain IDs:A, B
Chain Length:570
Number of Molecules:2
Biological Source:Pseudomonas fluorescens
Primary Citation
Active-site engineering of benzaldehyde lyase shows that a point mutation can confer both new reactivity and susceptibility to mechanism-based inhibition.
J.Am.Chem.Soc. 132 438 439 (2010)
PMID: 20030408 DOI: 10.1021/ja907064w

Abstact

Benzaldehyde lyase (BAL) from Pseudomonas putida is a thiamin diphosphate (ThDP)-dependent enzyme that catalyzes the breakdown of (R)-benzoin. Here we report that a point mutant, BAL A28S, not only catalyzes the decarboxylation of benzoylformate but, like benzoylformate decarboxylase (BFDC), is also inactivated by the benzoylformate analogues methyl benzoylphosphonate (MBP) and benzoylphosphonate (BP). The latter has no effect on wild-type BAL, and the inactivation of the A28S variant is shown to result from phosphorylation of the newly introduced serine residue. This lends support to the proposal that an appropriately placed nucleophile facilitates the expulsion of carbon dioxide from the active site in many ThDP-dependent decarboxylases.

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