Structural highlights
Function[DHMA_CAUCR] Catalyzes hydrolytic cleavage of carbon-halogen bonds in halogenated aliphatic compounds, leading to the formation of the corresponding primary alcohols, halide ions and protons. Publication Abstract from PubMedTwo 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 A 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. Biochemical characterization of two haloalkane dehalogenases: DccA from Caulobacter crescentus and DsaA from Saccharomonospora azurea.,Carlucci L, Zhou E, Malashkevich VN, Almo SC, Mundorff EC Protein Sci. 2016 Apr;25(4):877-86. doi: 10.1002/pro.2895. Epub 2016 Feb 21. PMID:26833751[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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