5ESR image
Entry Detail
PDB ID:
5ESR
Keywords:
Title:
Crystal structure of haloalkane dehalogenase (DccA) from Caulobacter crescentus
Biological Source:
PDB Version:
Deposition Date:
2015-11-17
Release Date:
2016-06-01
Method Details:
Experimental Method:
Resolution:
1.48 Å
R-Value Free:
0.14
R-Value Work:
0.12
R-Value Observed:
0.12
Space Group:
C 2 2 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Haloalkane dehalogenase
Chain IDs:A
Chain Length:308
Number of Molecules:1
Biological Source:Caulobacter crescentus (strain ATCC 19089 / CB15)
Primary Citation
Biochemical characterization of two haloalkane dehalogenases: DccA from Caulobacter crescentus and DsaA from Saccharomonospora azurea.
Protein Sci. 25 877 886 (2016)
PMID: 26833751 DOI: 10.1002/pro.2895

Abstact

Two putative haloalkane dehalogenases (HLDs) of the HLD-I subfamily, DccA from Caulobacter crescentus and DsaA from Saccharomonospora azurea, have been identified based on sequence comparisons with functionally characterized HLD enzymes. The two genes were synthesized, functionally expressed in E. coli and shown to have activity toward a panel of haloalkane substrates. DsaA has a moderate activity level and a preference for long (greater than 3 carbons) brominated substrates, but little activity toward chlorinated alkanes. DccA shows high activity with both long brominated and chlorinated alkanes. The structure of DccA was determined by X-ray crystallography and was refined to 1.5 Å resolution. The enzyme has a large and open binding pocket with two well-defined access tunnels. A structural alignment of HLD-I subfamily members suggests a possible basis for substrate specificity is due to access tunnel size.

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