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Nucleic Acids Research, 1990, Vol. 18, No. 6 1609-1612
© 1990

MOLECULAR BIOLOGY

Conserved DNA structures in origins of replication

Todd T. Eckdahl and John N. Anderson*

Department of Biological Sciences, Purdue University West Lafayette, IN 47907, USA

* To whom correspondence should be addressed

Received September 25, 1989. Revised February 11, 1990. Accepted February 11, 1990.

According to the model of Bramhill and Kornberg, initiation of DNA replication in prokaryotes involves binding of an initiator protein to origin DNA and subsequent duplex opening of adjacent direct repeat sequences. In this report, we have used computer analysis to examine the higher-order DNA structure of a variety of origins of replication from plasmids, phages, and bacteria in order to determine whether these sequences are localized in domains of altered structure. The results demonstrate that the primary sites of initiator protein binding lie in discrete domains of DNA bending, while the direct repeats lie within well-defined boundaries of an unusual anti-bent domain. The anti-bent structures arise from a periodicity of A3 and T3 tracts which avoids the 10–11 bp bending periodicity. Since DNA fragments which serve as replicators in yeast also contain these two conserved structural elements, the results provide new insight into the universal role of conserved DNA structures in DNA replication.


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