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Light‐induced carotenogenesis in Myxococcus xanthus : DNA sequence analysis of the carR region
Author(s) -
McGowan Simon J.,
Gorham Hazel C.,
Hodgson David A.
Publication year - 1993
Publication title -
molecular microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.857
H-Index - 247
eISSN - 1365-2958
pISSN - 0950-382X
DOI - 10.1111/j.1365-2958.1993.tb00943.x
Subject(s) - biology , myxococcus xanthus , promoter , regulon , gene , genetics , activator (genetics) , consensus sequence , response regulator , terminator (solar) , sequence analysis , dna , conserved sequence , mutant , microbiology and biotechnology , peptide sequence , gene expression , astronomy , ionosphere , physics
Summary The carR region encodes a light‐inducible promoter, a negative regulator of the promoter and a trans ‐acting activator that controls the light‐inducible Myxococcus xanthus carotenoid biosynthesis regulon. DNA sequence analysis revealed, downstream of the promoter, three translationally coupled genes, carQ, carR and carS. Sequencing of mutations demonstrated that carR encoded the negative regulator and was an integral membrane protein. Mutant construction and sequencing revealed that carS was the trans ‐acting activator and that carQ was a positive regulator of the promoter. Neither gene encodes proteins with known sequence‐specific DNA‐binding motifs. The sequence of the light‐inducible promoter region, identified by primer extension analysis, showed similarity to the consensus sequence of the Escherichia coli stress response (‘heat‐shock’) promoters.