6s06

Structural highlights

Function

LINB_SPHJU Catalyzes hydrolytic cleavage of carbon-halogen bonds in halogenated aliphatic compounds, leading to the formation of the corresponding primary alcohols, halide ions and protons. Has a broad substrate specificity since not only monochloroalkanes (C3 to C10) but also dichloroalkanes (> C3), bromoalkanes, and chlorinated aliphatic alcohols are good substrates (PubMed:9293022, PubMed:10100638). Shows almost no activity with 1,2-dichloroethane, but very high activity with the brominated analog (PubMed:9293022). Is involved in the degradation of the important environmental pollutant gamma-hexachlorocyclohexane (gamma-HCH or lindane) as it also catalyzes conversion of 1,3,4,6-tetrachloro-1,4-cyclohexadiene (1,4-TCDN) to 2,5-dichloro-2,5-cyclohexadiene-1,4-diol (2,5-DDOL) via the intermediate 2,4,5-trichloro-2,5-cyclohexadiene-1-ol (2,4,5-DNOL) (PubMed:7691794). This degradation pathway allows S.japonicum UT26 to grow on gamma-HCH as the sole source of carbon and energy.^{[1] [2] [3]}

See Also

• Dehalogenase 3D structures

References

1. ↑ Hynková K, Nagata Y, Takagi M, Damborský J. Identification of the catalytic triad in the haloalkane dehalogenase from Sphingomonas paucimobilis UT26. FEBS Lett. 1999 Mar 5;446(1):177-81. PMID:10100638 doi:10.1016/s0014-5793(99)00199-4
2. ↑ Nagata Y, Nariya T, Ohtomo R, Fukuda M, Yano K, Takagi M. Cloning and sequencing of a dehalogenase gene encoding an enzyme with hydrolase activity involved in the degradation of gamma-hexachlorocyclohexane in Pseudomonas paucimobilis. J Bacteriol. 1993 Oct;175(20):6403-10. PMID:7691794 doi:10.1128/jb.175.20.6403-6410.1993
3. ↑ Nagata Y, Miyauchi K, Damborsky J, Manova K, Ansorgova A, Takagi M. Purification and characterization of a haloalkane dehalogenase of a new substrate class from a gamma-hexachlorocyclohexane-degrading bacterium, Sphingomonas paucimobilis UT26. Appl Environ Microbiol. 1997 Sep;63(9):3707-10. PMID:9293022 doi:10.1128/aem.63.9.3707-3710.1997