Highly selective chemical modification of cruciform loops by diethyl pyrocarbonate.

Abstract:

:Diethyl pyrocarbonate reacts with the single-stranded loops of cruciform structures with great selectivity. Adenine bases are carbethoxylated, as a result of which the backbone may be cleaved with piperidine, and the level of chemical modification at each base may be determined. We have studied the ColE1 and (A-T)34 cruciforms of pColIR315 and pXG540. In each case we observe maximal modification at the most central adenosine of the loop, and an overall pattern of modification corresponding to a total loop size of about six bases. The results may be interpreted in terms of a model in which the loop has a defined tertiary structure. No modification was detected at either cruciform four-way junction, suggesting that this region is fully base-paired.

journal_name

Nucleic Acids Res

journal_title

Nucleic acids research

authors

Furlong JC,Lilley DM

doi

10.1093/nar/14.10.3995

subject

Has Abstract

pub_date

1986-05-27 00:00:00

pages

3995-4007

issue

10

eissn

0305-1048

issn

1362-4962

journal_volume

14

pub_type

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