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A search for genes involved in the inactivation and degradation of enzymes in sporulating Bacillus subtilis led to identification of the B. subtilis degA gene, whose product stimulates degradation of B. subtilis glutamine phosphoribosylpyrophosphate amidotransferase in Escherichia coli cells. degA encodes a 36.7-kDa protein that has sequence similarity to several E. coli and B. subtilis regulatory proteins of the LacI class. B. subtilis degA::cat insertional inactivation mutants had no detectable defect in the inactivation or degradation of phosphoribosylpyrophosphate amidotransferase in glucose- or lysine-starved B. subtilis cells, however. We suggest that degA encodes either a novel protease or, more likely, a gene that stimulates production of such a protease.

The degA gene product accelerates degradation of Bacillus subtilis phosphoribosylpyrophosphate amidotransferase in Escherichia coli