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Nucleic Acids Research, 1983, Vol. 11, No. 18 6475-6486
© 1983

CHEMISTRY

A novel guanlne-guanine base pairing: crystal structure of a complex between 7-methylguanosine and its iodide

Yuriko Yamagata, Satsuki Fukumoto, Kensaku Hamada, Takaji Fujiwara and Ken-ichi Tomita

Faculty of Pharmaceutical Sciences Osaka University, 1–6 Yamadaoka, Suita, Osaka 565, Japan

Received July 26, 1983. Revised September 5, 1983. Accepted September 5, 1983.

7-Methylguanosine, one of the biologically Important ninor nuoleosidea, could be crystallized as a complex of azwitterlonlo form and its iodide, and the crystal struoture was determined by the X-ray diffraotion method. The crystals belong to the trlclinio space group P1 with the unit cell dimensions: a=7.678(1), b=18.094(3), and c=5.711(1) Å, {alpha}=79.32(1), ß=80.14(1) and {gamma}=76.90(1)°. The struoture was solved by the heavy atom method and refined by the least-squares method to give a final R index of 0.075. The novel reverse Watson-Crick type base pairing observed between a positively oharged moleoule and a deprotonated one indicates that the deprotonatlon at the N(1) position promoted by the allcylation at the N(7) position may interrupt the formation of the normal Watson-Crick type GC base pair. The conformations about the glycosidic bond and the sugar puckering are quite different between the two molecules: the former has anti and C(4')-exo,C(3')-endo and the latter syn and C(1')-exo-C(2')-endo.


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