| Literature DB >> 6457962 |
M Chippaux, V Bonnefoy-Orth, J Ratouchniak, M C Pascal.
Abstract
Strains carrying operon fusions between the promotor of the chl I gene and the lac structural genes were constructed. From these strains in which the expression of the lac genes is under the control of both nitrate and oxygen, spontaneous regulatory mutants were selected: (i) mutants which synthesize beta-galactosidase constitutively in anaerobiosis; (ii) mutants in which beta-galactosidase synthesis is no longer repressed by oxygen. Introduction of the nir R mutated allele into strains carrying these fusions resulted in the total loss of beta-galactosidase synthesis, confirming that nir R is a regulatory gene controlling the expression of the biosynthesis of the nitrate reductase.Entities:
Mesh:
Substances:
Year: 1981 PMID: 6457962 DOI: 10.1007/bf00293938
Source DB: PubMed Journal: Mol Gen Genet ISSN: 0026-8925