H-DNA and Z-DNA in the mouse c-Ki-ras promoter.

Abstract:

:The mouse c-Ki-ras protooncogene promoter contains a homopurine-homopyrimidine domain that exhibits S1 nuclease sensitivity in vitro. We have studied the structure of this DNA region in a supercoiled state using a number of chemical probes for non-B DNA conformations including diethyl pyrocarbonate, osmium tetroxide, chloroacetaldehyde, and dimethyl sulfate. The results demonstrate that two types of unusual DNA structures formed under different environmental conditions. A 27-bp homopurine-homopyrimidine mirror repeat adopts a triple-helical H-DNA conformation under mildly acidic conditions. This H-DNA seems to account for the S1 hypersensitivity of the promoter in vitro, since the observed pattern of S1 hypersensitivity at a single base level fits well with the H-DNA formation. Under conditions of neutral pH we have detected Z-DNA created by a (CG)5-stretch, located adjacent to the homopurine-homopyrimidine mirror repeat. The ability of the promoter DNA segment to form non-B structures has implications for models of gene regulation.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Pestov DG,Dayn A,Siyanova EYu,George DL,Mirkin SM

doi

10.1093/nar/19.23.6527

subject

Has Abstract

pub_date

1991-12-11 00:00:00

pages

6527-32

issue

23

eissn

0305-1048

issn

1362-4962

journal_volume

19

pub_type

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