Uranyl photofootprinting of triple helical DNA.

Abstract:

:Two triple helix structures (15-mers containing only T.A-T triplets or containing mixed T.A-T and C.G-C triplets) have been studied by uranyl mediated DNA photocleavage to probe the accessibility of the phosphates of the DNA backbone. Whereas the phosphates of the pyrimidine strand are at least as accessible as in double stranded DNA, in the phosphates of the purine strand are partly shielded and more so at the 5'-end of the strand. With the homo A/T target increased cleavage is observed towards the 3'-end on the pyrimidine strand. These results show that the third strand is asymmetrically positioned along the groove with the tightest triple strand double strand interactions at the 5'-end of the third strand. The results also indicate that homo-A versus mixed A/G 'Hoogsteen-triple helices' have different structures.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Nielsen PE

doi

10.1093/nar/20.11.2735

keywords:

subject

Has Abstract

pub_date

1992-06-11 00:00:00

pages

2735-9

issue

11

eissn

0305-1048

issn

1362-4962

journal_volume

20

pub_type

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