1887

Abstract

Hybridization to a PCR product derived from conserved sigma-factor sequences led to the identification of two DNA segments that display significant sequence similarity to the family of genes encoding the σ (RpoH) heat-shock transcription factors. The first gene, , complements an mutation. Cells containing an mutation are impaired in growth at 37 °C under free-living conditions and are defective in nitrogen fixation during symbiosis with alfalfa. A plasmid-borne fusion increases in expression upon entry of the culture into the stationary phase of growth. The second gene, designated , is 42% identical to the gene. Cells containing an mutation have no apparent phenotype under free-living conditions or during symbiosis with the host plant alfalfa. An fusion increases in expression during the stationary phase of growth. The presence of two -like sequences in is reminiscent of the situation in , which has three genes.

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2001-09-01
2021-08-04
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