title: Cloning and characterization of the immunity region of phage phi 80.
abstract: The immunity region of phage phi 80 has been localized. It codes for at least three proteins: a protein of 34 kDa which has the biological properties of the phage repressor, and two other proteins of 9 kDa and 18 kDa which are the first proteins on the rightward operon. These two proteins are negatively regulated by the 34 kDa protein at a divergent promoter site. By position analogy with phage lambda, but not by its biological activity, the 9 kDa protein could be the cro product. The 18 kDa protein is able to block totally UV induction of phage phi 80.
mesh_terms: D003001:Cloning, Molecular; D003090:Coliphages / Q000235:genetics* / Q000276:immunology; D004262:DNA Restriction Enzymes; D004926:Escherichia coli / Q000235:genetics* / Q000276:immunology; D005814:Genes, Viral; D009710:Nucleotide Mapping; D010957:Plasmids; D013045:Species Specificity
chemical_list: D004262:DNA Restriction Enzymes