Disparate oxygen responsiveness of two regulatory cascades that control expression of symbiotic genes in Bradyrhizobium japonicum

被引：67

作者：

Sciotti, MA ^{[1
]}

Chanfon, A ^{[1
]}

Hennecke, H ^{[1
]}

Fischer, HM ^{[1
]}

机构：

[1] ETH, Inst Mikrobiol, CH-8092 Zurich, Switzerland

来源：

JOURNAL OF BACTERIOLOGY | 2003年 / 185卷 / 18期

关键词：

D O I：

10.1128/JB.185.18.5639-5642.2003

中图分类号：

Q93 [微生物学];

学科分类号：

071005 ; 100705 ;

摘要：

Two oxygen-responsive regulatory systems controlling numerous symbiotic genes in Bradyrhizobium japonicum were assayed in free-living cultures for their capacity to activate target genes under different oxygen conditions. NifA- and FixLJ-controlled target genes showed disparate relative expression patterns. Induction of NifA-dependent genes was observed only at oxygen concentrations below 2% in the gas phase, whereas that of FixLJ-controlled targets progressively increased when the oxygen concentration was lowered from 21 to 5, 2, or 0.5%. We propose that this reflects a response to a gradient of increasing oxygen deprivation as bacteria invade their host during root nodule development.

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页码：5639 / 5642

页数：4

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