EXPRESSION OF THE RECA GENE IS REDUCED IN ESCHERICHIA-COLI TOPOISOMERASE-I MUTANTS

被引:19
作者
URIOS, A [1 ]
HERRERA, G [1 ]
ALEIXANDRE, V [1 ]
BLANCO, M [1 ]
机构
[1] INST INVEST CITOL CAJA AHORROS VALENCIA,CSIC CTR,AMADEO DE SABOYA 4,E-46010 VALENCIA,SPAIN
来源
MUTATION RESEARCH | 1990年 / 243卷 / 04期
关键词
DNA gyrase; recA gene; SOS mutagenesis; Topoisomerase I;
D O I
10.1016/0165-7992(90)90142-7
中图分类号
Q3 [遗传学];
学科分类号
071007 ; 090102 ;
摘要
We studied the influence of DNA topological changes on Escherichia coli recA gene expression. This was monitored by measuring β-galactosidase activity in cells containing a recA-lacZ fusion. To modulate DNA supercoiling we used mutations in the genes encoding for topoisomerase I and DNA gyrase. After either UV irradiation or treatment with the gyrase inhibitor ciprofloxacin, induction of the recA gene was reduced in topA10 mutants, this reduction being alleviated when gyrA or gyrB mutations causing DNA relaxation were present. A reduced induction of recA was also observed after incubation of cells carrying the recA441 mutation at 42°C in the presence of adenine. Using bacteria deficient in the LexA repressor, we have demonstrated that the topA10 mutation reduces the constitutive expression of the recA gene. We suggest that the increase in negative supercoiling resulting from topoisomerase I deficiency interferes with transcription from the recA promoter. The reduction in the expression of the recA gene in topA10 bacteria could determine their increased UV sensitivity as well as their partial defectiveness in SOS mutability. © 1990.
引用
收藏
页码:267 / 272
页数:6
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