Crystal structure of a nucleoside model for the interstrand cross-link formed by the reaction of 2′-deoxyguanosine and an abasic site in duplex DNA

Abstract

The title compound, 9-[(2R,4S,5R)-4-hydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl]-2-{[(2R,4S,5R)-4-methoxy-5-(methoxymethyl)tetrahydrofuran-2-yl]amino}-1H-purin-6(9H)-one, C17H25N5O7, crystallizes with two independent molecules (A and B) in the asymmetric unit. In the crystal, the guanosine moieties of molecules A and B are linked by N - H⋯N and O - H⋯N hydrogen-bonding interactions, forming ribbons which are stacked to form columns along [100]. These columns are then linked by O - H⋯O hydrogen bonds between the ribose moieties and numerous C - H⋯O interactions to complete the three-dimensional structure.