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Regulation by repression of urease biosynthesis in Proteus rettgeri

✍ Scribed by C. Zorn; R. Dietrich; Prof. Dr. H. Kaltwasser

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
464 KB
Volume
22
Category
Article
ISSN
0233-111X

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✦ Synopsis

Abstract

Measuring the specific enzyme activity in cells of Proteus rettgeri it was shown that urease formation is controlled by repression through ammonia. Derepressed synthesis of the enzyme, as initiated by the absence of ammonia, required an external nitrogen source, which may not only be urea, but also nitrate, glutamate or nutrient broth. In contradiction to earlier reports the observations indicated that urea is not required for the synthesis of this enzyme, and that, therefore, urease is not an inducible enzyme in this microorganism.

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