1M77

Near Atomic Resolution Crystal Structure of an A-DNA Decamer d(CCCGATCGGG): Cobalt Hexammine Interactions with A-DNA

1M77 の概要

• エントリーDOI: 10.2210/pdb1m77/pdb
• 分子名称: 5'-D(*CP*CP*CP*GP*AP*TP*CP*GP*GP*G)-3', COBALT HEXAMMINE(III) (3 entities in total)
• 機能のキーワード: a-dna, cobalt hexammine, dna
• タンパク質・核酸の鎖数: 1
• 化学式量合計: 3207.11

構造登録者

Ramakrishnan, B.,Sekharudu, C.,Pan, B.C.,Sundaralingam, M. (登録日: 2002-07-18, 公開日: 2003-01-07, 最終更新日: 2024-04-03)

主引用文献

Ramakrishnan, B.,Sekharudu, C.,Pan, B.,Sundaralingam, M.
Near-atomic resolution crystal structure of an A-DNA decamer d(CCCGATCGGG): cobalt hexammine interaction with A-DNA.
Acta Crystallogr.,Sect.D, 59:67-72, 2003

PubMed Abstract: The structure of the DNA decamer d(CCCGATCGGG) has been determined at 1.25 A resolution. The decamer crystallized in the tetragonal space group P4(3)2(1)2, with unit-cell parameters a = b = 44.3, c = 24.8 A and one strand in the asymmetric unit. The structure was solved by the molecular-replacement method and refined to R(work) and R(free) values of 16.3 and 18.5%, respectively, for 5969 reflections. The decamer forms the A-form DNA duplex, with the abutting crystal packing typical of A-DNA. The crystal packing interactions seem to distort the local conformation: A5 adopts the trans/trans conformation for the torsion angles alpha and gamma instead of the usual gauche(-)/gauche(+) conformations, yielding G*(G.C) base triplets. The highly hydrated [Co(NH(3))(6)](3+) ion adopts a novel binding mode to the DNA duplex, binding directly to phosphate groups and connecting to N7 and O6 atoms of guanines by water bridges. Analysis of thermal parameters (B factors) shows that the nucleotides involved in abutting crystal packing are thermally more stable than other nucleotides in the duplex.

PubMed: 12499541
DOI: 10.1107/S0907444902018917

実験手法

X-RAY DIFFRACTION (1.25 Å)