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The first genetic, in vivo, and in vitro evidences that YrxA is the regulator of NAD de novo biosynthesis inBacillus subtilis are hereby reported. The protein is essential to the transcription repression of the divergent operonsnadBCA andnifS-yrxA in the presence of nicotinic acid and binds to their shared operator-promoter region.

YrxA Is the Transcriptional Regulator That Represses De Novo NAD Biosynthesis inBacillus subtilis