Structure of the tetradecanucleotide d(CCCCGGTACCGGGG)2 as an A-DNA duplex
Mandal, P.K., Venkadesh, S., Gautham, N.(2012) Acta Crystallogr Sect F Struct Biol Cryst Commun 68: 393-399
- PubMed: 22505405 
- DOI: https://doi.org/10.1107/S174430911200869X
- Primary Citation of Related Structures:  
3V9D - PubMed Abstract: 
The crystal structure of the tetradecanucleotide sequence d(CCCCGGTACCGGGG)(2) has been determined at 2.5 Å resolution in the tetragonal space group P4(1). This sequence was designed with the expectation of a four-way junction. However, the sequence crystallized as an A-DNA duplex and represents more than one full turn of the A-helix. The crystallographic asymmetric unit consists of one tetradecanucleotide duplex. The structural parameters of the A-type DNA duplex structure and the crystal-packing arrangement are described. One Mn(2+) ion was identified with direct coordination to the N7 position of G(13) and a water molecule at the major-groove side of the C(2)·G(13) base pair.
Organizational Affiliation: 
C. A. S. in Crystallography and Biophysics, University of Madras, Guindy, Chennai 600 025, India.