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. 1975 Dec;124(3):1395–1402. doi: 10.1128/jb.124.3.1395-1402.1975

Deoxyribonucleic acid modification by intermediate-type modification mutants of Escherichia coli K-12 and B.

J Bulkacz, D Roulland-Dussoix, H W Boyer
PMCID: PMC236052  PMID: 1104586

Abstract

The modification of bacteriophages grown on r-m+/- restriction and modification mutants of Escherichia coli K-12 or B appears to be related to the number of restriction-specific sites in the viral genome. Bacteriophage fd and its mutant U1 fd, which carry two and one B-specific sites, respectively, are not modified in vivo by rB-mB+/- mutant strains. In vitro treatment of fd RF-B+/- deoxyribonucleic acid (DNA) or U1 fd RF-B+/- DNA by endo R-Eco B results in cleavage of the substrate DNA. Lambda bacteriophage, after growth in r-m+/- mutant host strains (lambda-K+/- or lambda-B+/-), is partially protected from in vivo degradation by wild-type homospecific strains. Its efficiency of plating on these strains is approximately 10(-2). However, a hybrid phi80-lambda phage which carries only one K-specific site (sklambda-1) is not modified by rK-mK+/- strains. Labeled DNAs from lambda-B+/- and lambda-K+/- phages were used as substrates for endo R-Eco B and endo R-Eco K nucleases. Zonal centrifugation analysis of the products of the reactions indicate that rK-mK+/- mutants do not protect lambda DNA from in vitro degradation by endo R-Eco K. In contrast, rB-mB+/- mutants appear to partially protect lambda DNA from attack by endo R-Eco B.

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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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