Tris (phenanthroline) metal complexes: probes for DNA helicity.

Abstract:

:The intercalative binding of chiral tris(phenanthroline) metal complexes to DNA is stereo-selective. The enantiomeric selectivity is based upon the differential steric interactions between the two non-intercalating phenanthroline ligands of each isomer with the DNA phosphate backbone. Gel electrophoretic assays of helical unwinding, optical enrichment studies by equilibrium dialysis and luminescence titrations with separated enantiomers of (phen)3Ru2+ all indicate that the delta isomer binds preferentially to the right-handed duplex. The chiral discrimination is governed by the DNA helical asymmetry. Complete stereospecifity is seen with isomers of the bulkier RuDIP (tris-4,7-diphenylphenanthrolineruthenium(II]. While both isomers bind to Z-DNA, a poor template for discrimination, binding of lambda-RuDIP to B-DNA is precluded. These chiral complexes therefore serve as a chemical probe to distinguish left and right-handed DNA helices in solution.

journal_name

J Biomol Struct Dyn

authors

Barton JK

doi

10.1080/07391102.1983.10507469

subject

Has Abstract

pub_date

1983-12-01 00:00:00

pages

621-32

issue

3

eissn

0739-1102

issn

1538-0254

journal_volume

1

pub_type

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