Kinking of DNA and RNA Helices by Bulged Nucleotides Observed by Fluorescence Resonance Energy Transfer

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 1994 Nov 22

PMID 7526401

Citations 65

Authors

C Gohlke

A I Murchie

D M Lilley

R M Clegg

Affiliations

Soon will be listed here.

Abstract

Fluorescence resonance energy transfer (FRET) has been used to demonstrate the bending of DNA and RNA helices for three series of double-stranded molecules containing bulge loops of unopposed adenosine nucleotides (An, n = 0-9). Fluorescein and rhodamine were covalently attached to the 5' termini of the two component strands. Three different methods were applied to measure the FRET efficiencies. The extent of energy transfer within each series increases as the number of bulged nucleotides varies from 1 to 7, indicating a shortening of the end-to-end distance. This is consistent with a bending of DNA and RNA helices that is greater for larger bulges. The FRET efficiency for DNA molecules with A9 bulges is lower than the efficiency for the corresponding A7 bulged molecules, although the A9 molecules exhibit increased electrophoretic retardation. Ranges of bending angles can be estimated from the FRET results.

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