グアニンと7,8-ジヒドロキサンホプテリンの反射結晶:結晶の位置,構成,構造
Gan Zhang1, Anna Hirsch2, Guy Shmul3
1Department of Structural Biology , Weizmann Institute of Science , Rehovot 76100 , Israel.
Journal of the American Chemical Society
|November 26, 2019
まとめ
魚の目には 独特の結晶の層があります 研究者達は外層に グアニンと内層に 7,8-ジヒドロキサンホッテリンを検出し の目の光敏感性を高めました
科学分野:
- バイオ物理学
- クリスタルグラフィー
- イチオロジー
背景:
- 魚の目にはしばしば反射する結晶の層があり,通常はガニンと考えられ,視力を助けます.
- (Stizostedion lucioperca) の目には 独特の二層の結晶構造があります
研究 の 目的:
- スチゾステディオン・ルシオペルカの2つの異なる層の結晶成分を特定する.
- 視覚の感受性を高めるために,これらの成分の結晶構造と機能を明らかにする.
主な方法:
- 結晶構造を分析するために,X線微分法 (XRD) と電子微分法を使用した.
- 密度関数理論 (DFT) の計算で結晶構造をモデル化した.
- マトリックス・アシスタント・レーザー・デソープション/イオン化飛行時間 (MALDI-TOF) とラーマンスペクトロスコーピーは,固体結晶組成を分析した.
主要な成果:
- 外層の結晶は グアニンであることが確認されました
- 内部層の結晶は,当初はキサントポテリンと推測されていたが,明らかに7,8-ジヒドロキサントポテリンと特定された.
- 構造モデリングとXRDデータフィッティングは,7,8-ジヒドロキサンホプテリンの結晶構造を確認した.
結論:
- スチゾステディオン・ルシオペルカの眼は,固有のグアニンと7,8-ジヒドロキサンホッテリンの結晶層を使用しています.
- グアニン結晶は銀色の反射面を提供し,7,8-ジヒドロキサンホッテリン結晶は反射によって網膜の光感度を高めます.
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