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  • Title: Documentation of auxotrophic mutation in blue-green bacteria: characterization of a tryptophan auxotroph in Agmenellum quadruplicatum.
    Author: Ingram LO, Pierson D, Kane JF, Van Baalen C, Jensen RA.
    Journal: J Bacteriol; 1972 Jul; 111(1):112-8. PubMed ID: 4204902.
    Abstract:
    A tryptophan-requiring auxotroph of Agmenellum quadruplicatum strain BG1, a species of blue-green bacteria, was isolated by means of a nitrosoguanidine-penicillin procedure. Its growth characteristics were determined, and the enzymological block was identified in the A activity of tryptophan synthetase. Starvation of the auxotroph for tryptophan resulted in the derepression of the synthesis of all five enzymes. The first four enzymes derepressed 2- to 3-fold, and tryptophan synthetase B derepressed 20-fold. In the parental prototroph, BG1, anthranilate synthetase was active in crude extracts with ammonia as the amino donor reactant, but not with glutamine.
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