Report

A Structural Basis for Recognition of A·T and T·A Base Pairs in the Minor Groove of B-DNA

Science  02 Oct 1998:
Vol. 282, Issue 5386, pp. 111-115
DOI: 10.1126/science.282.5386.111

You are currently viewing the abstract.

View Full Text

Via your Institution

Log in through your institution

Log in through your institution


Abstract

Polyamide dimers containing three types of aromatic rings—pyrrole, imidazole, and hydroxypyrrole—afford a small-molecule recognition code that discriminates among all four Watson-Crick base pairs in the minor groove. The crystal structure of a specific polyamide dimer-DNA complex establishes the structural basis for distinguishing T·A from A·T base pairs. Specificity for the T·A base pair is achieved by means of distinct hydrogen bonds between pairs of substituted pyrroles on the ligand and the O2 of thymine and N3 of adenine. In addition, shape-selective recognition of an asymmetric cleft between the thymine-O2 and the adenine-C2 was observed. Although hitherto similarities among the base pairs in the minor groove have been emphasized, the structure illustrates differences that allow specific minor groove recognition.

  • * To whom correspondence should be addressed. E-mail: dervan{at}its.caltech.edu (P.B.D.); dcrees{at}its.caltech.edu(D.C.R.)

View Full Text

Related Content