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J Bacteriol. 1969 April; 98(1): 167-171
Copyright © 1969 American Society for Microbiology. All Rights Reserved.

Tryptophanase in Diverse Bacterial Species

¹ Department of Microbiology, University of Illinois, Urbana, Illinois 61801

ABSTRACT

The distribution of tryptophanase was studied. The highest observed specific activity, µmoles per minute per milligram (dry weight) cells, is given in parentheses after each species. Tryptophanase was inducible and repressible in Escherichia coli (.914), Paracolobactrum coliforme (.210), Proteus vulgaris (.146), Aeromonas liquefaciens (.030), Photobacterium harveyi (.035), Sphaerophorus varius (.021), Bacteroides sp. (.048), and Corynebacterium acnes (.042). The enzyme was constitutive and nonrepressible in Bacillus alvei (.013), and was inducible but not repressible by glucose in Micrococcus aerogenes (.036). Indole-positive bacteria were found in fecal or intestinal samples from a variety of animals among the mammals, reptiles, insects, molluscs, fish, crustaceans, and amphibians.

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