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  • Title: Molecular structure of the A-tract DNA dodecamer d(CGCAAATTTGCG) complexed with the minor groove binding drug netropsin.
    Author: Tabernero L, Verdaguer N, Coll M, Fita I, van der Marel GA, van Boom JH, Rich A, Aymamí J.
    Journal: Biochemistry; 1993 Aug 24; 32(33):8403-10. PubMed ID: 8395202.
    Abstract:
    The molecular structure of the complex between the minor groove binding drug netropsin and the dodecamer d(CGCAAATTTGCG) has been solved and refined by X-ray diffraction analysis to an R-factor of 19.8% and 2.2-A resolution. The drug lies in the narrow minor groove of the B-DNA fragment, covering five of the six A.T base pairs (from A5.T20 to T9.A16). The long six A.T base pair tract allows the drug to bind in a position that optimizes its contacts with the DNA, establishing hydrogen bonds with O2 of thymines and N3 of adenines. The DNA molecule shows a high propeller twist only at the A6.T19 step of the A-tract. Two three-centered hydrogen bonds are observed in the major groove at half of the A-tract.
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