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. 1974 Nov;120(2):906–916. doi: 10.1128/jb.120.2.906-916.1974

Isolation of a trans-Dominant Histidase-Negative Mutant of Salmonella typhimurium

David C Hagen a,1, Peter J Lipton a, Boris Magasanik a
PMCID: PMC245856  PMID: 4156361

Abstract

A mutation of Salmonella typhimurium was obtained that results in the failure of cells to synthesize the enzyme l-histidine ammonia-lyase (histidase). The mutation mapped within the hutH gene and in merodiploid strains was dominant over the wild-type allele. Extracts from cells bearing the trans-dominant histidase-negative allele were shown to contain material that reacts immunologically with antiserum against purified wild-type histidase. It is proposed that the trans-dominant allele results in the synthesis of defective histidase subunits that can combine with, and partially inactivate, wild-type histidase subunits. This subunit mixing presumably does occur, as the enzyme synthesized in a hybrid merodiploid strain is abnormally heat sensitive.

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Selected References

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