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. 1984 Jan;49(1):178–182. doi: 10.1128/jvi.49.1.178-182.1984

Selective cloning of a DNA single-strand initiation determinant from phi X174 replicative-form DNA.

M D Strathearn, R L Low, D S Ray
PMCID: PMC255439  PMID: 6228669

Abstract

An M13 phage deletion mutant, M13 delta E101, developed as a vector for selecting DNA sequences that direct DNA strand initiation on a single-stranded template, has been used for cloning restriction enzyme digests of phi X174 replicative-form DNA. Initiation determinants, detected on the basis of clear-plaque formation by the chimeric phage, were found only in restriction fragments containing the unique effector site in phi X174 DNA for the Escherichia coli protein n' dATPase (ATPase). Furthermore, these sequences were functional only when cloned in the orientation in which the phi X174 viral strand was joined to the M13 viral strand. A 181-nucleotide viral strand fragment containing this initiation determinant confers a phi X174-type complementary-strand replication mechanism on M13 chimeras. The chimeric phage is converted to the parental replicative form in vivo by a mechanism resistant to rifampin, a specific inhibitor of the normal RNA polymerase-dependent mechanism of M13. In vitro, the chimeric single-stranded DNA promotes the assembly of a functional multiprotein priming complex, or primosome, identical to that utilized by intact phi X174 viral strand DNA. Chimeric phage containing the sequence complementary to the 181-nucleotide viral strand sequence shows no initiation capability, either in vivo or in vitro.

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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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