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Single-crystal X-ray structure determinations of the complex between the minor-groove binder distamycin and d(GGCCAATTGG) reveal two 1 : 1 binding modes which differ in the orientation of the drug molecule in the minor groove. The two crystals were grown from different crystallization conditions and found to diffract to 2.38 and ˚ 1.85 A, respectively. The structures were refined to completion using SHELXL-93, resulting in a residual R factor of ˚ 20.30% for the 2.38-A resolution structure (including 46 ˚ water molecules) and 19.74% for the 1.85-A resolution structure (including 74 water molecules). ...
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Báo cáo Y học: Two 1 : 1 binding modes for distamycin in the minor groove of d(GGCCAATTGG)
