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Volume 152, Issue 1

Transcriptional analysis of the FF ATPase operon of ATCC 13032 reveals strong induction by alkaline pH Free

Abstract

, a soil Gram-positive bacterium used for industrial amino acid production, was found to grow optimally at pH 7·0–9·0 when incubated in 5 litre fermenters under pH-controlled conditions. The highest biomass was accumulated at pH 9·0. Growth still occurred at pH 9·5 but at a reduced rate. The expression of the pH-regulated FF ATPase operon (containing the eight genes ) was induced at alkaline pH. A 7·5 kb transcript, corresponding to the eight-gene operon, was optimally expressed at pH 9·0. The same occurred with a 1·2 kb transcript corresponding to the gene. RT-PCR studies confirmed the alkaline pH induction of the FF operon and the existence of the gene. The gene, located upstream of the FF operon, was expressed at a lower level than the polycistronic 7·5 kb mRNA, from a separate promoter (P-atp1). Expression of the major promoter of the FF operon, designated P-atp2, and the P-atp1 promoter was quantified by coupling them to the pET2 promoter-probe vector. Both P-atp1 and P-atp2 were functional in and . Primer extension analysis identified one transcription start point inside each of the two promoter regions. The P-atp1 promoter fitted the consensus sequence of promoters recognized by the vegetative factor of , whereas the −35 and −10 boxes of P-atp2 fitted the consensus sequence for -recognized promoters C/GG/AC 17–22 nt /GTT/, known to be involved in expression of heat-shock and other stress-response genes. These results suggest that the FF operon is highly expressed at alkaline pH, probably using a RNA polymerase.

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2006-01-01
2024-04-19
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Transcriptional analysis of the F0F1 ATPase operon of Corynebacterium glutamicum ATCC 13032 reveals strong induction by alkaline pH
Microbiology 152, 11 (2006); https://doi.org/10.1099/mic.0.28383-0
/content/journal/micro/10.1099/mic.0.28383-0
/content/journal/micro/10.1099/mic.0.28383-0
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