Isolation and characterization of nonsense mutations in gene 10 of bacteriophage phi 6.
Nonsense mutants of bacteriophage phi 6 were isolated by a procedure that involved directed mutagenesis of a cDNA copy of genomic segment M, transcription of this segment, in vitro packaging into procapsids, and transfection of spheroplasts to form viable mutant phage. Recombinant phi 6 viruses that contained amber mutations in two open reading frames, ORF 10 and ORF D, of genomic segment M were isolated. We show that phi 6 protein P10 is the gene product of ORF 10. Further characterization of the phi 6 ORF 10(Am) mutant revealed that phi 6 membrane-associated protein P10 is not required to make enveloped phage particles in infected cells. Enveloped phage particles isolated from a phi 6 ORF 10(Am) infection contained extremely low levels of phi 6 membrane-associated proteins P6 and P3. The low abundance is due to the very low level of P6 synthesis in phi 6 ORF 10(Am)-infected cells. The results suggest that P10 might play a role in regulating the translation of gene 6. Protein P10 was found to be required for host lysis.
Johnson
M D
MD
Department of Microbiology, Public Health Research Institute, New York, New York 10016.
Mindich
L
L
D017126:Bacteriophage phi 6 / Q000235:genetics* / Q000254:growth & development; D001483:Base Sequence; D005814:Genes, Viral / Q000235:genetics*; D008969:Molecular Sequence Data; D016297:Mutagenesis, Site-Directed; D009154:Mutation / Q000235:genetics*; D009690:Nucleic Acid Conformation; D015183:Restriction Mapping; D014764:Viral Proteins / Q000096:biosynthesis; D015678:Viral Structural Proteins / Q000235:genetics* / Q000302:isolation & purification; D014779:Virus Replication
D014764:Viral Proteins; D015678:Viral Structural Proteins; C086429:protein P10, bacteriophage phi6