Metal transport ATPase genes from Cupriavidus metallidurans CH34:: a transcriptomic approach

被引:18
|
作者
Monchy, S
Vallaeys, T
Bossus, A
Mergeay, M
机构
[1] Belgian Nucl Res Ctr, Lab Radiobiol & Microbiol, SCK, CEN, B-2400 Mol, Belgium
[2] INRA, Dept Microbiol, INAPG, F-78850 Thiverval Grignon, France
[3] Environm Technol, B-2400 Mol, Belgium
关键词
Ralstonia; Cupriavidus metallidurans; P1-type ATPase; heavy-metal resistance; ZntA; thallium; bismuth;
D O I
10.1080/03067310600583824
中图分类号
O65 [分析化学];
学科分类号
070302 ; 081704 ;
摘要
Cupriavidus metallidurans strain CH34 is a multiple metal resistant beta-proteobacterium isolated from the sediments of a zinc metallurgical plant. This strain possesses a large diversity of heavy-metal-resistance genes that are located mostly on two large plasmids, pMOL28 and pMOL30. The metal efflux ATPases constitute the major mechanism by which metal ions are removed and pumped out from the cytoplasmic pool of thiol groups. The genome of C. metallidurans CH34 contains eight such P1-ATPases. This high number of ATPases, compared with the P1-ATPase content in other micro-organisms, is a typical feature of the adaptation of C. metallidurans CH34 to metal-rich biotopes. We performed a phylogenetic analysis, and used quantitative PCR to study the metal-specific induction of the ATPases genes and, for some of them, their neighbouring genes. One of the ATPases, a homologue of the E. coli zntA gene, was characterized in detail by analysing the phenotypes of zntA mutants in different genetic backgrounds. In addition to the already-reported sensitivity to Zn(II), Cd(II), and Pb(II), zntA mutants also displayed a higher sensitivity to T1(I) and Bi(III), indicating that the ZntA protein might play a role in the tolerance of very large cations.
引用
收藏
页码:677 / 692
页数:16
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