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Nucleic Acids Symposium Series 2006 50(1):41-42; doi:10.1093/nass/nrl021
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© 2006 Oxford University Press

A crystal structure study when crystallized only in d(CG)3 + methylamine and a d(CG)3 + metal ion

Hirofumi Ohishi1, Toshimasa Ishida1, Koji Tsukamoto2, Naoyoshi Maezaki2 and Tetsuaki Tanaka2

1 Osaka University of Pharmaceutical Sciences 4-20-1 Nasahara, Takatsuki, Osaka 569-1094 Japan, 2 Graduated School of Pharmaceutical Sciences, Osaka University 1-6 Yamadaoka, Suita, Osaka 565-0871 Japan

There is not an example of the crystallization only of d(CG)3 and a metallic cation without putting the amine in addition in there is no example of the crystallization d(CG)3 with methylamine that is the mono-amine so far either. We were able to obtain a very beautiful crystal with all sides of 0.3mm by the sitting drop method that had done the crystallization of d(CG)3+ methylamine and d(CG)3+ Mg2 +.

The crystal was diffracted up to 1.0 Å by using the synchrotron radiation. As a result of the X-ray crystal structure analysis, methylamine was not seen while d(CG)3+ methylamine was crystallizing mysteriously. d(CG)3 had stabilized with five Mg2+ ions. d(CG)3 had stabilized similarly with five Mg2+ ions in the crystal of d(CG)3+ Mg2+. The position of these five Mg2+ ions understood that I agreed on superimpose in a crystal of d(CG)3 + methylamine, a crystal of d(CG)3+Mg2+, a crystal of d(CG)3 + spermidine, and crystals of d(CG)3 + PA (24) which was already analyzed so as to cut it and stabilized d(CG)3 at an about the same position.


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