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Bacillus subtilis gtaB encodes UDP-glucose pyrophosphorylase and is controlled by stationary-phase transcription factor sigma B.

Department of Food Science and Technology, University of California, Davis 95616.

ABSTRACT

Transcription factor sigma B of Bacillus subtilis controls a large stationary-phase regulon, but in no case has the physiological function of any gene in this regulon been identified. Here we show that transcription of gtaB is partly dependent on sigma B in vivo and that gtaB encodes UDP-glucose pyrophosphorylase. The gtaB reading frame was initially identified by a sigma B-dependent Tn917lacZ fusion, csb42. We cloned the region surrounding the csb42 insertion, identified the reading frame containing the transposon, and found that this frame encoded a predicted 292-residue product that shared 45% identical residues with the UDP-glucose pyrophosphorylase of Acetobacter xylinum. The identified reading frame appeared to lie in a monocistronic transcriptional unit. Primer extension and promoter activity experiments identified tandem promoters, one sigma B dependent and the other sigma B independent, immediately upstream from the proposed coding region. A sequence resembling a factor-independent terminator closely followed the coding region. By polymerase chain reaction amplification of a B. subtilis genomic library carried in yeast artificial chromosomes, we located the UDP-glucose pyrophosphorylase coding region near gtaB, mutations in which confer phage resistance due to decreased glycosylation of cell wall teichoic acids. Restriction mapping showed that the coding region overlapped the known location of gtaB. Sequence analysis of a strain carrying the gtaB290 allele found an alteration that would change the proposed initiation codon from AUG to AUA, and an insertion-deletion mutation in this frame conferred phage resistance indistinguishable from that elicited by the gtaB290 mutation. We conclude that gtaB encodes UDP-glucose pyrophosphorylase and is partly controlled by sigma B. Because this enzyme is important for thermotolerance and osmotolerance in stationary-phase Escherichia coli cells, our results suggest that some genes controlled by sigma B may play a role in stationary-phase survival of B. subtilis.

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