Download MendeleyThe high-resolution crystal structure of a parallel-stranded guanine tetraplex.
Laughlan, G., Murchie, A.I., Norman, D.G., Moore, M.H., Moody, P.C., Lilley, D.M., Luisi, B.(1994) Science 265: 520-524
- PubMed: 8036494
- DOI: https://doi.org/10.1126/science.8036494
- Primary Citation of Related Structures:
244D - PubMed Abstract:
Repeat tracts of guanine bases found in DNA and RNA can form tetraplex structures in the presence of a variety of monovalent cations. Evidence suggests that guanine tetraplexes assume important functions within chromosomal telomeres, immunoglobulin switch regions, and the human immunodeficiency virus genome. The structure of a parallel-stranded tetraplex formed by the hexanucleotide d(TG4T) and stabilized by sodium cations was determined by x-ray crystallography to 1.2 angstroms resolution. Sharply resolved sodium cations were found between and within planes of hydrogen-bonded guanine quartets, and an ordered groove hydration was observed. Distinct intra- and intermolecular stacking arrangements were adopted by the guanine quartets. Thymine bases were exclusively involved in making extensive lattice contacts.
Organizational Affiliation:
Medical Research Council Virology Unit, University of Glasgow, UK.
