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. 1989 Feb;171(2):1100–1105. doi: 10.1128/jb.171.2.1100-1105.1989

Cascading regulation of histidase activity in Streptomyces griseus.

T A Kroening 1, K E Kendrick 1
PMCID: PMC209707  PMID: 2492506

Abstract

Mutants of Streptomyces griseus unable to utilize histidine as the sole nitrogen source have been isolated and characterized. Using a mutant defective in the production of histidase, we have demonstrated that urocanate functions as the inducer of the histidine utilization system. Another mutant produced histidase that was locked in an inactive form but could be activated by treatment with an extract from the wild-type strain or the histidase-negative strain. This mutant was deficient in the activity of a protein of Mr ca. 90,000 to 100,000 that is required for the activation of histidase. Histidase was synthesized constitutively but was maintained in an inactive form until after histidine or urocanate was added to the medium. At least four components were implicated in the activation of histidase: histidase, the activation protein, urocanate, and a phosphatase that is apparently inactive in cells grown without inducer. The functions of the last three factors could be supplanted in vitro by incubation of histidase with snake venom phosphodiesterase or 5' nucleotidase. The results suggest that histidine utilization by S. griseus is controlled posttranslationally by an activation cascade that involves at least two regulatory proteins.

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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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