Nucleic Acids Research, 2001, Vol. 29, No. 23 4881-4891
© 2001 Oxford University Press
Strong minor groove base conservation in sequence logos implies DNA distortion or base flipping during replication and transcription initiation
National Cancer Institute at Frederick, Laboratory of Experimental and Computational Biology, Building 469, PO Box B, Frederick, MD 21702-1201, USA
The sequence logo for DNA binding sites of the bacteriophage P1 replication protein RepA shows unusually high sequence conservation (
2 bits) at a minor groove that faces RepA. However, B-form DNA can support only 1 bit of sequence conservation via contacts into the minor groove. The high conservation in RepA sites therefore implies a distorted DNA helix with direct or indirect contacts to the protein. Here I show that a high minor groove conservation signature also appears in sequence logos of sites for other replication origin binding proteins (Rts1, DnaA, P4
, EBNA1, ORC) and promoter binding proteins (
70,
D factors). This finding implies that DNA binding proteins generally use non-B-form DNA distortion such as base flipping to initiate replication and transcription.
* Tel: +1 301 846 5581; Fax: +1 301 846 5598; Email: toms{at}ncifcrf.gov
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