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. 1984 Jun;50(3):766–772. doi: 10.1128/jvi.50.3.766-772.1984

Bacteriophage phi 29 proteins required for in vitro DNA-gp3 packaging.

M A Bjornsti, B E Reilly, D L Anderson
PMCID: PMC255735  PMID: 6427474

Abstract

In vitro assembly of bacteriophage phi 29 in crude extracts involves efficient packaging of a DNA-protein complex (DNA- gp3 ) into a prohead with the aid of the gene 16 product ( gp16 ) and subsequent assembly of neck and tail proteins ( Bjornsti et al., J. Virol. 41:508-517, 1982; Bjornsti et al., J. Virol. 45:383-396, 1983; Bjornsti et al., Proc. Natl. Acad. Sci. U.S.A. 78:5861-5865, 1981). To define the viral proteins required for the DNA- gp3 encapsidation phase, we purified biologically active proheads and DNA- gp3 and constructed a chimeric plasmid, pUM101 , which contained and expressed gene 16 of phi 29 and no other viral genes. The plasmid-specified gp16 was both necessary and sufficient to package 24% of the DNA- gp3 added to the purified proheads , and the DNA-filled heads so produced were efficiently complemented to infectious phage by the addition of neck and tail proteins. Purified proheads and DNA- gp3 gave linear dose-response curves with slopes of approximately 1; in contrast, a 4-fold dilution of gp16 resulted in a 1,000-fold reduction of phi 29, suggesting a requirement for multiple copies of this protein.

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Selected References

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