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. 1995 Nov 7;92(23):10767–10771. doi: 10.1073/pnas.92.23.10767

Crystal structure of a DNA decamer showing a novel pseudo four-way helix-helix junction.

N Spink 1, C M Nunn 1, J Vojtechovsky 1, H M Berman 1, S Neidle 1
PMCID: PMC40693  PMID: 7479880

Abstract

The crystal structure of the decanucleotide d(CGCAATTGCG)2 has been solved by a combination of molecular replacement and heavy-atom procedures and has been refined to an R factor of 20.2% at 2.7 A. It is not a fully base-paired duplex but has a central core of eight Watson-Crick base pairs flanked by unpaired terminal guanosines and cytosines. These participate in hydrogen-bonding arrangements with adjacent decamer duplexes in the crystal lattice. The unpaired guanosines are bound in the G+C regions of duplex minor grooves. The cytosines have relatively high mobility, even though they are constrained to be in one region where they are involved in base-paired triplets with G.C base pairs. The 5'-AATT sequence in the duplex region has a narrow minor groove, providing further confirmation of the sequence-dependent nature of groove width.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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