Affiliation:
1. Centro de Biologı́a Molecular “Severo Ochoa” (CSIC-UAM), Universidad Autónoma, Canto Blanco, 28049 Madrid, Spain
Abstract
ABSTRACT
The product of bacteriophage φ29 early gene 6, protein p6, is a double-stranded-DNA binding protein and one of the more abundant proteins during viral infection. We have studied the role of protein p6 in vivo through the infection of suppressor and nonsuppressor
Bacillus subtilis
strains with a phage carrying a nonsense mutation in gene 6, sus6(626). In the absence of functional protein p6, the two major processes of the viral cycle, transcription and DNA replication, were affected. Viral DNA synthesis was practically abolished, and early transcription was remarkably delayed and, in addition, underregulated at late times of the infection. The amount of protein p6 synthesized after infection with mutant phage sus6(626) under suppressor conditions was sixfold lower than that produced after wild-type infection. Nonetheless, phage production was as high as that obtained after wild-type infection. These results indicate that p6 is synthesized in amounts higher than those needed for most of its functions. However, the concentration of protein p6 appeared to be important for repression of the early promoter C2.
Publisher
American Society for Microbiology
Subject
Molecular Biology,Microbiology
Cited by
12 articles.
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