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. 1987 Sep;61(9):2828–2834. doi: 10.1128/jvi.61.9.2828-2834.1987

Genetic control of capsid length in bacteriophage T4: DNA sequence analysis of petite and petite/giant mutants.

D T Mooney, J Stockard, M L Parker, A H Doermann
PMCID: PMC255798  PMID: 3612953

Abstract

The T4 gene 23 product (gp23) encodes the major structural protein of the mature capsid. Mutations in this gene have been described which disrupt the normal length-determining mechanism (A.H. Doermann, F.A. Eiserling, and L. Boehner, J. Virol. 12:374-385, 1973). Mutants which produce high levels of petite and giant phage (ptg) are restricted to three tight clusters in gene 23 (A.H. Doermann, A. Pao, and P. Jackson, J. Virol. 61:2823-2827, 1987). Twenty-six of these ptg mutations were cloned, and their DNA sequence alterations were determined. Each member of this set of ptg mutants arose from a single mutation, and the set defined 10 different sites at which ptg mutations can occur in gene 23. Two petite (pt) mutations in gene 23 (pt21-34 and ptE920g), which produce high frequencies of petite particles but no giants, were also sequenced. Both pt21-34 and ptE920g were shown to include multiple mutations. The phenotypes attributed to both pt and ptg mutations are discussed relative to the mechanism of capsid morphogenesis. A site-directed mutation (SD-1E) was created at the ptgNg191 site, and its phenotypic consequences were examined. Plaque morphology revertants arising from a gene 23 mutant derivative of pt21-34 and from SD-1E were isolated. A preliminary mapping of the mutation(s) responsible for their revertant phenotypes suggested that both intra- and extragenic suppressors of the petite phenotype can be isolated by this method.

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Selected References

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