Cloning and sequencing of a dehalogenase gene encoding an enzyme with hydrolase activity involved in the degradation of gamma-hexachlorocyclohexane in Pseudomonas paucimobilis
作者:Y Nagata、T Nariya、R Ohtomo、M Fukuda、K Yano、M Takagi
DOI:10.1128/jb.175.20.6403-6410.1993
日期:1993.10
analysis revealed an open reading frame (designated the linB gene) of 885 bp within the region. The deduced amino acid sequence of LinB showed significant similarity to hydrolytic dehalogenase, DhlA (D. B. Janssen, F. Pries, J. van der Ploeg, B. Kazemier, P. Terpstra, and B. Witholt, J. Bacteriol. 171:6791-6799, 1989). The protein product of the linB gene was 32 kDa by sodium dodecyl sulfate-polyacrylamide
在pseudomonas paucimobilis UT26中,γ-六氯环己烷(gamma-HCH)通过两步脱氯化氢转化为化学上不稳定的中间体1,3,4,6-四氯-1,4-环己二烯(1,4-TCDN),然后通过两步水解脱卤,通过化学不稳定的中间体2,4,5-三氯-2,5代谢成2,5-二氯-2,5-环己二烯-1,4-二醇(2,5-DDOL) -环己二烯-1-醇(2,4,5-DNOL)。为了克隆编码负责化学不稳定中间体1,4-TCDN和2,4,5-DNOL转化的酶的基因,在恶臭假单胞菌PpY101LA中构建了p.paucimobilis UT26的基因组文库,其中装有linA基因由Tn5引入。亚克隆一个粘粒克隆中的一个8kb BglII片段,该片段可将γ-六氯环己烷转化为2,5-DDOL,和随后的删除分析显示,一个ca。1.1kb区域负责该活性。核苷酸序列分析表明该区域内有一个885 bp的开