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. 1981 Jul;147(1):62–68. doi: 10.1128/jb.147.1.62-68.1981

Biochemical genetics of tryptophan synthesis in Pseudomonas acidovorans.

W E Buvinger, L C Stone, H E Heath
PMCID: PMC216007  PMID: 7240095

Abstract

Sixty independent tryptophan auxotrophs of Pseudomonas acidovorans were isolated and characterized for nutritional response to intermediates of the pathway, accumulation of intermediates, and levels of tryptophan-synthetic enzymes. Mutants for each of the seven proteins catalyzing the five steps of tryptophan synthesis were obtained. Transductional analysis established three unlinked chromosomal regions: trpE, trpGDC, and trpFBA. The order of the genes within the two clusters was not determined. The levels and enzymatic activities of wild-type and mutant strains indicated that trpE and trpGDC were repressed by tryptophan. In contrast, trpFBA was not derepressed significantly by starvation for tryptophan. The trpG mutants had an additional requirement for p-aminobenzoate, which suggested that anthranilate synthase subunit II also served as glutamine-binding protein in the analogous reaction catalyzed by p-aminobenzoate synthase. In addition, trpD mutants revealed the ability of P. acidovorans to degrade anthranilate via the beta-ketoadipate pathway.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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