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プラチナ (IV) 複合体によるグアノシン誘導体の酸化:サイクル化による内部電子転送
Sunhee Choi1, Richard B Cooley, Adelina Voutchkova
1Department of Chemistry and Biochemistry, Middlebury College, Middlebury, VT 05753, USA. choi@middlebury.edu
Journal of the American Chemical Society
|February 11, 2005
まとめ
プラチナ (IV) 複合体は2'-デオキシグアノシン3'-モノフォスファート (3'-dGMP) を酸化して循環性製品にします. このDNA酸化は,反応が起こるために5'核好性群を必要とします.
科学分野:
- 無機化学 無機化学とは
- バイオ・オーガニック化学 バイオ・オーガニック化学
- 有機化学 オーガニック・ケミストリー
背景:
- 移行金属複合体はDNAの酸化を媒介することができる.
- 以前の研究では,プラチナ (IV) 複合体が5 -dGMPを8 -oxo-5 -dGMPに酸化することを示した.
- 酸化製品は金属複合体とDNA構造に依存しています.
研究 の 目的:
- 3 -dGMPがプラチナ (IV) 複合体によって酸化される過程を調査する.
- このDNA酸化反応のメカニズムと産物の解明を図る.
- プラチナ (IV) 複合体によるグアノシン酸化のための構造的要件を決定する.
主な方法:
- 高性能液体クロマトグラフィー (HPLC) とは
- (1) H と (31) P 核磁共振 (NMR) スペクトロスコピー
- マトリックス・アシスト・レーザー・デソープション・イオン化・フライト・タイム・オブ・フライト・マス・スペクトロメトリ (MALDI-TOF MS)
主要な成果:
- プラチナ (((IV) 複合体はステキオメトリック的に3 -dGMPをサイクル (5 -O-C8) -3 -dGMP.に酸化する.
- 提案されたメカニズムは,Pt(IV) がN7に結合し,核愛性の攻撃と電子移転が続く.
- この反応は,酸化が起こるために,グアノシンの5位にある核好性群を必要とします.
結論:
- プラチナ (IV) 複合体は,3-dGMPとユニークな酸化還元反応を促進します.
- サイクル (5-O-C8) -3-dGMPの形成は,5-ヒドロキシル基に依存しています.
- この研究は,金属媒介のDNA還元酸化反応における基板構造の重要性を強調しています.
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