Rao SN. Molecular mechanics studies on the conformations of 2',3'-dideoxy-2',3'-didehydroguanine nucleoside, D4G.
Biophys J 1998;
74:3131-9. [PMID:
9635766 PMCID:
PMC1299653 DOI:
10.1016/s0006-3495(98)78019-1]
[Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Conformational energy calculations have been presented on guanine nucleoside in which the furanose ring is replaced by 2',3'-dideoxy-2',3'-didehydrofuran using molecular mechanics and conformational analysis. Conformational energies have been evaluated using the MM2 and AMBER94 force field parameters at two different dielectric constants. The results are presented in terms of isoenergy contours in the conformational space of the glycosidic (chi) and C4'-C5' (gamma) bonds torsions. In general, the chi-gamma interrelationships differ from the corresponding plots for unmodified nucleosides and nucleotides, reported previously. Consistency of the calculated preferred conformations with the x-ray data is sensitive to the force field employed.
Collapse