Thermally stable tryptophanase process for producing the same, and thermally stable tryptophanase-producing microorganism.

摘要

A thermally stable tryptophanase having (1) an optimum temperature for activity at a pH of 8.0 of about 70 DEG C., and (2) such thermal stability that it is not thermally deactivated when maintained at temperatures up to about 65 DEG C. and a pH of 8.0 for 40 minutes. The thermally stable tryptophanase can be produced by cultivating in a tryptophan-containing culture medium a thermally stable tryptophanase-producing bacterium which does not grow alone in said medium but grows there in the presence of Bacillus sp. strain S, and obtaining the resulting thermally stable tryptophanase from the culture broth. The thermally stable tryptophanase-producing microorganism for use in the above process is a novel organism.