2DQO

Crystal Structure of d(CXCTXCTTC):r(gaagaagag) Where X is 5-(N-aminohexyl)carbamoyl-2'-O-methyluridine

2DQO の概要

• エントリーDOI: 10.2210/pdb2dqo/pdb
• 関連するPDBエントリー: 2DQP 2DQQ 479D
• 分子名称: DNA (5'-D(*DCP*(OMU)P*DCP*DTP*(OMU)P*DCP*DTP*DTP*DC)-3'), RNA (5'-R(*GP*AP*AP*GP*AP*AP*GP*AP*G)-3'), SODIUM ION, ... (6 entities in total)
• 機能のキーワード: modified nucleotide, 5-(n-aminohexyl)carbamoyl-2'-o-methyluridine, a-form rna:dna hybrid duplex, dna-rna hybrid
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 6310.68

構造登録者

Juan, E.C.M.,Kondo, J.,Ito, T.,Ueno, Y.,Matsuda, A.,Takenaka, A. (登録日: 2006-05-29, 公開日: 2007-04-17, 最終更新日: 2023-10-25)

主引用文献

Juan, E.C.M.,Kondo, J.,Kurihara, T.,Ito, T.,Ueno, Y.,Matsuda, A.,Takenaka, A.
Crystal structures of DNA:DNA and DNA:RNA duplexes containing 5-(N-aminohexyl)carbamoyl-modified uracils reveal the basis for properties as antigene and antisense molecules
Nucleic Acids Res., 35:1969-1977, 2007

PubMed Abstract: Oligonucleotides containing 5-(N-aminohexyl)carbamoyl-modified uracils have promising features for applications as antigene and antisense therapies. Relative to unmodified DNA, oligonucleotides containing 5-(N-aminohexyl)carbamoyl-2'-deoxyuridine ((N)U) or 5-(N-aminohexyl)carbamoyl-2'-O-methyluridine ((N)U(m)), respectively exhibit increased binding affinity for DNA and RNA, and enhanced nuclease resistance. To understand the structural implications of (N)U and (N)U(m) substitutions, we have determined the X-ray crystal structures of DNA:DNA duplexes containing either (N)U or (N)U(m) and of DNA:RNA hybrid duplexes containing (N)U(m). The aminohexyl chains are fixed in the major groove through hydrogen bonds between the carbamoyl amino groups and the uracil O4 atoms. The terminal ammonium cations on these chains could interact with the phosphate oxygen anions of the residues in the target strands. These interactions partly account for the increased target binding affinity and nuclease resistance. In contrast to (N)U, (N)U(m) decreases DNA binding affinity. This could be explained by the drastic changes in sugar puckering and in the minor groove widths and hydration structures seen in the (N)U(m) containing DNA:DNA duplex structure. The conformation of (N)U(m), however, is compatible with the preferred conformation in DNA:RNA hybrid duplexes. Furthermore, the ability of (N)U(m) to render the duplexes with altered minor grooves may increase nuclease resistance and elicit RNase H activity.

PubMed: 17341465
DOI: 10.1093/nar/gkl821

実験手法

X-RAY DIFFRACTION (2.3 Å)