THE BAT GENE OF HALOBACTERIUM-HALOBIUM ENCODES A TRANS-ACTING OXYGEN INDUCIBILITY FACTOR

被引:37
作者
GROPP, F [1 ]
BETLACH, MC [1 ]
机构
[1] UNIV CALIF SAN FRANCISCO, DEPT BIOCHEM & BIOPHYS, SAN FRANCISCO, CA 94143 USA
关键词
ARCHAEA; BACTERIORHODOPSIN; PURPLE MEMBRANE; BOP GENE CLUSTER;
D O I
10.1073/pnas.91.12.5475
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Oxygen and light affect the expression of the bacterioopsin gene (bop), which encodes a light-driven proton pump in the purple membrane of Halobacterium halobium. This response is thought to be mediated by a set of genes located adjacent to the bop gene. DNA fragments containing either the bop gene or the entire bop gene cluster reversed the phenotype of purple membrane-deficient strains with mutations in the bop gene. Purple membrane synthesis was constitutive in one of these strains transformed with the bop gene alone. The same strain transformed with the bop gene cluster was inducible by low oxygen tension. Moreover, another strain that constitutively expresses purple membrane remained constitutive when transformed with the bop gene alone but the phenotype of the strain changed to inducible when transformed with the bop gene cluster. Additional experiments have confirmed that one of the genes of the bop gene cluster, the bat gene, encodes a trans-acting factor that is necessary and sufficient to confer inducibility of purple membrane synthesis by low oxygen tension.
引用
收藏
页码:5475 / 5479
页数:5
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