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M9480456.TXT
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1994-08-20
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Document 0456
DOCN M9480456
TI The high-resolution crystal structure of a parallel-stranded guanine
tetraplex.
DT 9410
AU Laughlan G; Murchie AI; Norman DG; Moore MH; Moody PC; Lilley DM; Luisi
B; Medical Research Council Virology Unit, University of Glasgow,; UK.
SO Science. 1994 Jul 22;265(5171):520-4. Unique Identifier : AIDSLINE
MED/94310435
AB 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.
DE Computer Graphics Crystallization Crystallography, X-Ray
Guanine/*CHEMISTRY Hydrogen Bonding Molecular Structure *Nucleic Acid
Conformation Oligodeoxyribonucleotides/*CHEMISTRY Sodium Support,
Non-U.S. Gov't JOURNAL ARTICLE
SOURCE: National Library of Medicine. NOTICE: This material may be
protected by Copyright Law (Title 17, U.S.Code).