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J Bacteriol. 1981 November; 148(2): 653-658

New class of Bacillus subtilis glutamine-requiring mutants.

ABSTRACT

By using genetic analysis, the mutations of eight glutamine-requiring mutants isolated from Bacillus subtilis 168 were all shown to be linked to the thyA marker. A three-factor transduction analysis performed with one of the gln mutations indicated that the gene order in this region of the B. subtilis chromosome was gltA-thyA-gln. On the basis of recombination index values, two closely linked groups were identified. The mutations belonging to one group were assigned to the structural gene for glutamine synthetase, and those belonging to the other group might impair a regulatory locus. The residual glutamine synthetase activities and the cross-reacting materials of the mutants from both recombination groups supported these conclusions.

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