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. 1972 Feb;9(2):377–389. doi: 10.1128/jvi.9.2.377-389.1972

Bacteriophage T4 Head Morphogenesis II. Studies on the Maturation of Gene 49-Defective Head Intermediates

Ronald B Luftig a,1, Carol Ganz a
PMCID: PMC356304  PMID: 4552417

Abstract

An investigation into the metabolic requirements for maturation of gene 49-defective heads indicated that adenosine triphosphate energy and continued deoxyribonucleic acid (DNA) but not ribonucleic acid synthesis were needed. The fate of DNA present at restrictive temperatures (41.5 C) in tsC9 (gene 49)-infected cells was also examined. After lysis of infected cells, the 12 to 32% deoxyribonuclease-resistant DNA associated with isolated gene 49-defective heads was found to be attached to a deoxyribonuclease-sensitive complex associated with the debris. Pulsechase experiments where 3H-thymidine was used to label the DNA at 41.5 C suggested that more DNA from this pool was present in phage recovered after rescue of the gene 49 function than could be accounted for by the deoxyribonuclease-resistant portion. Further, when these experiments were repeated with an additional density shift (15N13C-glucose to 14N12C-glucose), the DNA extracted from phage rescued at 10 min after the temperature shift-down was found to be 90% conserved. These results suggest a model whereby DNA packaging into capsid precursors is separated from DNA replication and the energy from DNA synthesis provides the driving force for packaging. Pulse-chase, temperature-shift experiments with E920g (gene 66) or E920g;tsC9 mutant-infected cells showed that gene (49, 66)-defective heads, which were isolated as small, isometric-shaped unfilled heads, were a precursor to “petite” phage. This suggests that the maturation process is independent of the size and shape of the head membrane. Similar experiments with the double mutant tsC9;amN120 indicate that gene 49-defective heads can also be filled in the absence of tails.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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