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DNA fragments containing a sequence d(GCGAAAGC) are known to be highly thermostable. To investigate the structural basis for such a specific property, crystallographic studies of the DNA octamer and a nanomer d(GXGAAAGCT) (X = 2'-deoxy-5-iodocytidine) have been performed. The present higher resolution X-ray analyses have shown that both DNA oligomers are stabilized respectively to form a zipper-type duplex homodimer. PAGE of these oligomers, however, indicates that they are monomeric even when their crystals were dissolved at room temperature.

X-ray analyses of d(GCGAAAGC) and d(GXGAAAGCT), where X = 2'-deoxy-5-iodocytidine