Crystal structure of d(CCGGGGTACCCCGG)2 at 1.4 angstrom resolution.
Karthik, S., Thirugnanasambandam, A., Mandal, P.K., Gautham, N.(2017) Acta Crystallogr F Struct Biol Commun 73: 259-265
- PubMed: 28471357
- DOI: https://doi.org/10.1107/S2053230X17004770
- Primary Citation of Related Structures:
5WV7 - PubMed Abstract:
The X-ray crystal structure of the DNA tetradecamer sequence d(CCGGGGTACCCCGG) 2 is reported at 1.4 Å resolution in the tetragonal space group P4 1 2 1 2. The sequence was designed to fold as a four-way junction. However, it forms an A-type double helix in the presence of barium chloride. The metal ion could not be identified in the electron-density map. The crystallographic asymmetric unit consists of one A-type double helix with 12 base pairs per turn, in contrast to 11 base pairs per turn for canonical A-DNA. A large number of solvent molecules have been identified in both the grooves of the duplex and around the backbone phosphate groups.
Organizational Affiliation:
CAS in Crystallography and Biophysics, University of Madras, Guindy Campus, Chennai 600 025, India.