title: Crystallization and preliminary investigations on a telomeric repeat sequence C4A2C4A2.
abstract: Repeat units based on the telomeric sequence of the ciliated protozoan Tetrahymena, d(C(4)A(2))(2), have been crystallized. Cytosine-rich DNA stretches are known to reside in telomeres and centromeres of eukaryotic chromosomes, playing crucial roles in the structural stability of the chromosome in addition to their connection with cancer and aging. Preliminary investigations on the telomeric repeat sequence C(4)A(2)C(4)A(2) from CD studies and X-ray crystal data suggest it to be a right-handed interdigitated tetraplex structure with hemiprotonated C.C(+) base pairs. The molecules appear to be packed one on top of another forming a discontinuous helix along c simulating a poly-C fibre, an arrangement which maximizes the number of cytosines stacked.
authors.affiliation: Department of Physics, Indian Institute of Science, Bangalore 560 012, India. savitha@chemie.fu-berlin.de
authors.forename: G
authors.initials: G
authors.lastname: Savitha
authors.forename: D
authors.initials: D
authors.lastname: Leonidas
authors.forename: K R
authors.initials: KR
authors.lastname: Acharya
authors.forename: M A
authors.initials: MA
authors.lastname: Viswamitra
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray; D004247:DNA / Q000138:chemical synthesis / Q000737:chemistry*; D009690:Nucleic Acid Conformation; D012091:Repetitive Sequences, Nucleic Acid; D016615:Telomere / Q000235:genetics
chemical_list: D004247:DNA