title: Bacteriophage lambda repressor allelic modulation of the Rex exclusion phenotype.
abstract: The sensitivity of delta red-gam delta ren mutants of bacteriophage lambda to Rex exclusion by lambda rexA+ rexB+ lysogens is modulated by the prophage cI repressor allele. We show the following: (i) lambda spi156 delta nin5 forms plaques on a cI+-rexA+-rexB+ lysogen with 10(5)-fold higher efficiency than on cI[Ts]-rexA+-rexB+ derivatives. (ii) The cI[Ts]857 allele augmentation of Rex exclusion is recessive to cI+. (iii) The cI857-mediated increase in Rex exclusion activity involves the participation of a genetic element mapping outside of cI-rexA-rexB.
authors.affiliation: Department of Microbiology and Immunology, College of Medicine, University of Saskatchewan, Saskatoon, SK S7N 5E5, Canada.
authors.forename: Roderick A
authors.initials: RA
authors.lastname: Slavcev
authors.forename: Harold J
authors.initials: HJ
authors.lastname: Bull
authors.forename: Sidney
authors.initials: S
authors.lastname: Hayes
mesh_terms: D000483:Alleles; D010582:Bacteriophage lambda / Q000235:genetics*; D004268:DNA-Binding Proteins; D004926:Escherichia coli / Q000235:genetics; D005814:Genes, Viral; D008957:Models, Genetic; D010641:Phenotype; D010957:Plasmids / Q000032:analysis; D012097:Repressor Proteins / Q000235:genetics* / Q000378:metabolism; D017361:Viral Nonstructural Proteins / Q000235:genetics*; D014764:Viral Proteins / Q000235:genetics*; D054334:Viral Regulatory and Accessory Proteins
chemical_list: D004268:DNA-Binding Proteins; D012097:Repressor Proteins; C094107:RexA protein, Bacteriophage lambda; D017361:Viral Nonstructural Proteins; D014764:Viral Proteins; D054334:Viral Regulatory and Accessory Proteins; C016649:phage repressor proteins; C069331:rexB protein, Bacteriophage lambda