Shape selective recognition of T.A base pairs by hairpin polyamides containing N-terminal 3-methoxy (and 3-chloro) thiophene residues.
Bioorg Med Chem
; 11(20): 4333-40, 2003 Oct 01.
Article
en En
| MEDLINE
| ID: mdl-13129569
ABSTRACT
Hairpin polyamides selectively recognize predetermined DNA sequences with affinities comparable to naturally occurring proteins. Internal side-by-side pairs of unsymmetrical aromatic rings within the minor groove of DNA distinguish each of the four Watson-Crick base pairs. In contrast, N-terminal ring pairs exhibit less specificity, with the exception of Im/Py targeting G.C base pairs. In an effort to explore the sequence specificity of new ring pairs, a series of hairpin polyamides containing 3-substituted-thiophene-2-carboxamide residues at the N-terminus was synthesized. An N-terminal 3-methoxy (or 3-chloro) thiophene residue paired opposite Py displayed 6- (and 3-) fold selectivity for T.A relative to A.T base pair, while disfavoring G,C base pairs by >200-fold. Our data suggests shape selective recognition with projection of the 3-thiophene substituent (methoxy or chloro) to the floor of the minor groove.
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Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Tiofenos
/
Timina
/
Adenina
/
Emparejamiento Base
/
Nylons
Idioma:
En
Revista:
Bioorg Med Chem
Asunto de la revista:
BIOQUIMICA
/
QUIMICA
Año:
2003
Tipo del documento:
Article
País de afiliación:
Estados Unidos