イミドジホスファートとピロホスファート:類似した構造の生物学的な意義の可能性
M Larsen1, R Willett, R G Yount
1Department of Chemistry, Washington State University, Pullman 99163, USA.
Science (New York, N.Y.)
|December 19, 1969
まとめ
硫酸ナトリウムイミドジフォスファートの構造は,硫酸ナトリウムパイロフォスファートに非常に似ています. この類似性は,藻類のポリフォスファートにおけるP-N-P結合が以前に検出されていなかった理由と,この結合を持つATPアナログがATPを模倣する理由を説明しています.
科学分野:
- 無機化学 無機化学とは
- 構造化学 構造化学とは
- バイオケミストリー バイオケミストリー
背景:
- パイロフォスファートナトリウムはP-O-P結合を特徴とし,生物学的エネルギー転送において極めて重要です.
- 藻類のポリフォスファートはP-N-P結合を含んでいるが,その構造的および機能的類似性は完全に理解されていない.
研究 の 目的:
- ナトリウムイミドジリン酸塩の結晶構造を決定するために.
- P-N-P結合の構造パラメータと,ナトリウムピロホスファートのP-O-P結合を比較する.
主な方法:
- 単一結晶X線 difrractionは,ナトリウムイミドジリン酸塩の構造を分析するために使用されました.
主要な成果:
- ナトリウムイミドジリン酸におけるPNP結合角度 (127.2°) とPN結合距離 (1.68 Å) を測定した.
- これらの値は,精製されたP-O-P結合角度 (128.6°) とP-O結合距離 (1.63 Å) と非常に似ています.
結論:
- P-N-PとP-O-P結合の構造的類似性は,藻類のポリフォスファートにおけるP-N-P結合の遅れた検出の説明を提供する.
- この構造的類似は,P-N-P結合を含む同類体によるアデノシン三リン酸 (ATP) の機能的模倣も説明する.
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