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The Bacillus subtilis gene encoding gamma-glutamyltranspeptidase (GGT) activity encodes a protein of 587 amino acids having extensive homologies with other procaryotic GGTs. Inactivation of the gene abolished all measurable GGT activity, which in the wild type was found mainly to be excreted into the medium commencing at the end of vegetative growth.
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Xu et al. (1996) studied this question.
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