title: Another gene affecting sexual expression of Escherichia coli.
abstract: We have examined the relationship between two chromosomal mutations of Escherichia coli K-12, fexA (0 min) and fexB (85 min), in regulating expression of the F sex factor. Together, fexA and fexB exert a pleiotropic effect on the expression of the F tra genes. F pilus synthesis, conjugal donor activity, and surface exclusion activity are all inhibited in the fexA fexB mutant. Either fex mutation alone is cryptic.
mesh_terms: D002874:Chromosome Mapping; D002876:Chromosomes, Bacterial; D003227:Conjugation, Genetic; D004926:Escherichia coli / Q000235:genetics*; D005144:F Factor; D010861:Fimbriae, Bacterial / Q000378:metabolism; D005786:Gene Expression Regulation; D005798:Genes, Bacterial; D009154:Mutation