Download MendeleyRecombination-like structure of d(CCGCGG).
Malinina, L., Urpi, L., Salas, X., Huynh-Dinh, T., Subirana, J.A.(1994) J Mol Biol 243: 484-493
- PubMed: 7966274
- DOI: https://doi.org/10.1006/jmbi.1994.1674
- Primary Citation of Related Structures:
192D - PubMed Abstract:
We have solved the single crystal X-ray structure of the synthetic DNA hexamer d(CCGCGG). The central alternating tetramer forms a Z-DNA duplex. The initial cytosine of each strand of the duplex swings out and forms a Watson-Crick base-pair with the terminal guanine of a symmetry-related molecule. Thus, two symmetry-related DNA molecules form a twin with intermolecular base-pairs at both ends. Such a twin is additionally stabilized by a sodium ion located on a dyad axis between two DNA duplexes. The total structure has recombination-like features. It also provides a model for B/Z junctions. The crystal used in this study belongs to space group C222(1) with a = 34.33 A, b = 44.04 A and c = 38.27 A. The structure was solved by molecular replacement using partial models, and refined by molecular dynamics simulated annealing and positional treatment. The refinement has been concluded with an R-factor of 18.5% for 2377 reflections with F > or = 2 sigma (F) in the resolution region 8.0 to 1.92 A. The asymmetric unit contains two strands of d(CCGCGG) and 38 water molecules.
Organizational Affiliation:
Departament d'Enginyeria Química, Universitat Politècnica de Catalunya, Barcelona, Spain.
