Bacteriophage phiX174: gene A overlaps gene B.
The map position of several phiX174 mutations in the genes A and B was determined by marker rescue with DNA fragments produced by the restriction enzymes Hha I, HindII, Hae III, and Alu I. All the gene B mutants were found to be located within gene A. Genetic complementation and analysis of phage-specific protein synthesis show that, under restrictive conditions, nonsense mutants in gene A do not block the synthesis and activity of the B protein and nonsense mutants in gene B do not affect the gene A function. The map position of the COOH-terminal end of gene A was determined using an amber mutant that synthesizes slightly shortened A and A proteins. It is concluded from these experiments that gene A overlaps gene B completely (or almost completely) and that the overlap region can be translated in two ways with different reading frames: one frame for the synthesis of the A and A proteins and another for the synthesis of the B protein.
D003090:Coliphages / Q000378:metabolism / Q000648:ultrastructure*; D004262:DNA Restriction Enzymes; D004279:DNA, Viral / Q000378:metabolism; D005796:Genes; D005815:Genetic Code; D008970:Molecular Weight; D009154:Mutation; D014176:Protein Biosynthesis; D013045:Species Specificity; D014764:Viral Proteins / Q000096:biosynthesis
D004279:DNA, Viral; D014764:Viral Proteins; D004262:DNA Restriction Enzymes
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