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Issue 1, 2009
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Recognition and discrimination of DNA quadruplexes by acridine-peptide conjugates

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Abstract

We have explored a series of trisubstituted acridine-peptide conjugates for their ability to recognize and discriminate between DNA quadruplexes derived from the human telomere, and the c-kit and N-ras proto-oncogenes. Quadruplex affinity was measured as the peptide sequences were varied, together with their substitution position on the acridine, and the identity of the C-terminus (acid or amide). Surface plasmon resonance measurements revealed that all compounds bound to the human telomeric quadruplex with sub-micromolar affinity. Docking calculations from molecular modelling studies were used to model the effects of substituent orientation and peptide sequence. Modelling and experiment were in agreement that placement of the peptide over the face of the acridine is detrimental to binding affinity. The highest degrees of selectivity were observed towards the N-ras quadruplex by compounds capable of forming simultaneous contacts with their acridine and peptide moieties. The ligands that bound best displayed quadruplex affinities in the 1–5 nM range and at least 10-fold discrimination between the quadruplexes studied.

Graphical abstract: Recognition and discrimination of DNA quadruplexes by acridine-peptide conjugates

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Article information


Submitted
22 Aug 2008
Accepted
22 Sep 2008
First published
30 Oct 2008

Org. Biomol. Chem., 2009,7, 76-84
Article type
Paper

Recognition and discrimination of DNA quadruplexes by acridine-peptide conjugates

J. E. Redman, J. M. Granadino-Roldán, J. A. Schouten, S. Ladame, A. P. Reszka, S. Neidle and S. Balasubramanian, Org. Biomol. Chem., 2009, 7, 76
DOI: 10.1039/B814682A

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