Bacteriophage T4 gp2 interferes with cell viability and with bacteriophage lambda Red recombination.
J Bacteriol
; 181(4): 1352-5, 1999 Feb.
Article
em En
| MEDLINE
| ID: mdl-9973367
ABSTRACT
The T4 head protein, gp2, promotes head-tail joining during phage morphogenesis and is also incorporated into the phage head. It protects the injected DNA from degradation by exonuclease V during the subsequent infection. In this study, we show that recombinant gp2, a very basic protein, rapidly kills the cells in which it is expressed. To further illustrate the protectiveness of gp2 for DNA termini, we compare the effect of gp2 expression on Red-mediated and Int-mediated recombination. Red-mediated recombination is nonspecific and requires the transient formation of double-stranded DNA termini. Int-mediated recombination, on the other hand, is site specific and does not require chromosomal termini. Red-mediated recombination is inhibited to a much greater extent than is Int-mediated recombination. We conclude from the results of these physiological and genetic experiments that T4 gp2 expression, like Mu Gam expression, kills bacteria by binding to double-stranded DNA termini, the most likely mode for its protection of entering phage DNA from exonuclease V.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Recombinação Genética
/
Proteínas Estruturais Virais
/
Bacteriófago T4
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Bacteriófago lambda
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Escherichia coli
Idioma:
En
Ano de publicação:
1999
Tipo de documento:
Article