title: Cell wall receptor for bacteriophage Mu G(+).
abstract: The invertible G segment in phage Mu DNA controls the host range of the phage. Depending on the orientation of the G segment, two types of phage particles, G(+) and G(-), are produced which recognize different cell surface receptors. The receptor for Mu G(+) was located in the lipopolysaccharide (LPS) of gram-negative bacteria. The analysis of different LPS core types and of mutants that were made resistant to Mu G(+) shows that the primary receptor site on Escherichia coli K-12 lies in the GlcNAc beta 1 . . . 6Glc alpha 1-2Glc alpha 1-part at the outer end of the LPS. Mu shares this receptor site in E. coli K-12 with the unrelated single-stranded DNA phage St-1. Phage D108, which is related to Mu, and phages P1 and P7, which are unrelated to Mu but contain a homologous invertible DNA segment, have different receptor requirements. Since they also bind to terminal glucose in a different configuration, they adsorb to and infect E. coli K-12 strains with an incomplete LPS core.
mesh_terms: D003090:Coliphages / Q000187:drug effects / Q000378:metabolism; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism*; D008070:Lipopolysaccharides / Q000235:genetics / Q000378:metabolism; D009154:Mutation; D011991:Receptors, Virus / Q000378:metabolism*; D013045:Species Specificity
chemical_list: D008070:Lipopolysaccharides; D011991:Receptors, Virus