Volume 4, Issue 4 pp. 784-802
Research Article

Chemical Primer Extension: Individual Steps of Spontaneous Replication

Jan A. Rojas Stütz

Jan A. Rojas Stütz

Institute for Organic Chemistry, University of Karlsruhe (TH), D-76131 Karlsruhe, (phone: +49-721-6082091; fax: +49-721-6084825)

Search for more papers by this author
Eric Kervio

Eric Kervio

Institute for Organic Chemistry, University of Karlsruhe (TH), D-76131 Karlsruhe, (phone: +49-721-6082091; fax: +49-721-6084825)

Search for more papers by this author
Christopher Deck

Christopher Deck

Institute for Organic Chemistry, University of Karlsruhe (TH), D-76131 Karlsruhe, (phone: +49-721-6082091; fax: +49-721-6084825)

Search for more papers by this author
Clemens Richert

Clemens Richert

Institute for Organic Chemistry, University of Karlsruhe (TH), D-76131 Karlsruhe, (phone: +49-721-6082091; fax: +49-721-6084825)

Search for more papers by this author
First published: 19 April 2007
Citations: 28

Abstract

The replication of genetic information, as we know it from today's biology, relies on template-directed, polymerase-catalyzed extension of primers. It is known that short stretches of complementary RNA can form on templates in the absence of enzymes. This account summarizes recent work on efficient enzyme-free primer extension, both with 3′-amino-terminal deoxyribonucleotide primers and with primers made of unmodified RNA. Near-quantitative primer extension with half-life times on the order of hours has been demonstrated by using azaoxybenzotriazolides of nucleotides and downstream-binding oligomers. Further, small non-nucleosidic substituents placed on the terminus of the template or the downstream-binding oligomer have been shown to increase the rate and fidelity of primer-extension reactions. Since all four templating bases (A, C, G, T/U) direct sequence-selective primer-extension steps, we feel that there is renewed hope that full, nonenzymatic replication from monomers may eventually be achieved.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.