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Mol Cell Biol. 1992 July; 12(7): 3216-3223

In vitro cell cycle arrest induced by using artificial DNA templates.

S Kornbluth, C Smythe and J W Newport

Department of Biology, University of California, San Diego, La Jolla 92093.

ABSTRACT

In cell extracts of Xenopus eggs which oscillate between S and M phases of the cell cycle, the onset of mitosis is blocked by the presence of incompletely replicated DNA. In this report, we show that several artificial DNA templates (M13 single-stranded DNA and double-stranded plasmid DNA) can trigger this feedback pathway, which inhibits mitosis. Single-stranded M13 DNA is much more effective than double-stranded plasmid DNA at inhibiting the onset of mitosis. Furthermore, we have shown that low levels of M13 single-stranded DNA and high levels of double-stranded plasmid DNA can elevate the tyrosine kinase activity responsible for phosphorylating p34cdc2, thereby inactivating maturation-promoting factor and inhibiting entry into mitosis. This constitutes a simplified system with which to study the signal transduction pathway from the DNA template to the tyrosine kinase responsible for inhibiting p34cdc2 activity.

Mol Cell Biol. 1992 July; 12(7): 3216-3223




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