4GXN image
Entry Detail
PDB ID:
4GXN
Title:
Diethylphosphonate Inhibited Structure of the Proteus mirabilis Lipase
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-09-04
Release Date:
2013-02-06
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.24
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 32
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Putative lipase
Chain IDs:A
Chain Length:307
Number of Molecules:1
Biological Source:Proteus mirabilis
Primary Citation
Crystal Structure of Proteus mirabilis Lipase, a Novel Lipase from the Proteus/Psychrophilic Subfamily of Lipase Family I.1.
Plos One 7 e52890 e52890 (2012)
PMID: 23300806 DOI: 10.1371/journal.pone.0052890

Abstact

Bacterial lipases from family I.1 and I.2 catalyze the hydrolysis of triacylglycerol between 25-45°C and are used extensively as biocatalysts. The lipase from Proteus mirabilis belongs to the Proteus/psychrophilic subfamily of lipase family I.1 and is a promising catalyst for biodiesel production because it can tolerate high amounts of water in the reaction. Here we present the crystal structure of the Proteus mirabilis lipase, a member of the Proteus/psychrophilic subfamily of I.1lipases. The structure of the Proteus mirabilis lipase was solved in the absence and presence of a bound phosphonate inhibitor. Unexpectedly, both the apo and inhibitor bound forms of P. mirabilis lipase were found to be in a closed conformation. The structure reveals a unique oxyanion hole and a wide active site that is solvent accessible even in the closed conformation. A distinct mechanism for Ca²⁺ coordination may explain how these lipases can fold without specific chaperones.

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