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. 1975 Apr;15(4):861–871. doi: 10.1128/jvi.15.4.861-871.1975

Transfection of Escherichia coli spheroplasts. V. Activity of recBC nuclease in rec+ and rec minus spheroplasts measured with different forms of bacteriophage DNA.

R Benzinger, L W Enquist, A Skalka
PMCID: PMC354530  PMID: 123277

Abstract

The in vivo activity of the recBC nuclease was assayed by transfection of isogenic rec+ and rec minus spheroplasts with bacteriophage DNA of various origin and structure. The results indicate that the recBC nuclease can limit transfection at several stages during the production of an infective center; such limitations depend primarily on whether the DNA is in, or assumes, a nuclease-sensitive structure. The first stage of limitation can occur when a nuclease-sensitive transfecting molecule enters the spheroplast. Other potential limitation points occur during replication and maturation of the bacteriophage DNA. The initial stage can be bypassed by using recBC nuclease-resistant molecules such as circular forms. Through analysis of results with other DNA structures, we found that in vivo the effects of the double-strand exonucleolytic activity of the recBC nuclease predominated. The effects of the single-strand nuclease activities seem to be modified from those observed for the purified enzyme in vitro (Karu et al., 1974). Inside the cell, the single-strand exonuclease activity is very weak and the single-strand endonuclease activity is abolished almost completely.

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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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