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J Bacteriol. 1962 November; 84(5): 979-987
Copyright © 1962, The Williams & Wilkins Company. All Rights Reserved.

TRYPTOPHANASE-TRYPTOPHAN SYNTHETASE SYSTEMS IN ESCHERICHIA COLI I.

Effect of Tryptophan and Related Compounds

^a Department of Microbiology, University of Minnesota, Minneapolis, Minnesota

ABSTRACT

FREUNDLICH, MARTIN (University of Minnesota, Minneapolis) AND HERMAN C. LICHSTEIN. Tryptophanase-tryptophan synthetase systems in Escherichia coli. I. Effect of tryptophan and related compounds. J. Bacteriol. 84:979–987. 1962.—The effect of tryptophan and related compounds on tryptophanase and tryptophan synthetase formation in Escherichia coli was determined. Several of these compounds stimulated the formation of tryptophanase while concomitantly decreasing the production of synthetase. A number of tryptophan analogues were found to inhibit growth. The possible mode of action of these substances was examined further. 5-Hydroxytryptophan greatly inhibited the formation of synthetase and also reduced growth. Its inhibitory action on growth was attributed, at least partially, to the false feedback inhibition of anthranilic acid formation. Tryptamine was found to be a potent inhibitor of the activity of synthetase, as well as of the enzyme(s) involved in the synthesis of anthranilic acid from shikimic acid. However, growth reduction was only partially reversed by tryptophan. Indole-3-acetic acid and indole-3-propionic acid decreased growth and increased the formation of synthetase six- to eightfold. The action of these compounds was ascribed to their ability to block the endogenous formation of tryptophan.

¹ Present address: Biological Laboratory, Long Island Biological Association, Cold Spring Harbor, N.Y.

² Present address: Department of Microbiology, College of Medicine, University of Cincinnati, Cincinnati, Ohio.