カルシウムオキシラート単水素の結晶化をシトラートによって選択的に原子に結合することによって調節する
S Roger Qiu1, Andrzej Wierzbicki, E Alan Salter
1Department of Chemistry and Materials Science, Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, California 94551, USA. qiu2@llnl.gov
Journal of the American Chemical Society
|June 23, 2005
まとめ
シトラート分子は,特定の結晶面と段階に選択的に結合することによって,酸化カルシウム単水素 (COM) の結晶の形状を変更する. この分子レベルの相互作用はCOM結晶化に影響を与え,腎石疾患の理解と管理に不可欠です.
科学分野:
- クリスタルグラフィーです.
- バイオミネラライゼーション
- コンピューティング・ケミストリー
背景:
- カルシウムオキシラート単水化合物 (COM) の結晶は,ほとんどのヒトの腎臓石の主な成分です.
- COM結晶化の分子メカニズムの理解は,腎石疾患の制御に不可欠です.
研究 の 目的:
- シトラートによるCOM結晶の形状の分子スケール変調を解明する.
- COM結晶表面におけるシトラートの結合相互作用とエネルギー偏好を調査する.
主な方法:
- In situ 原子力顕微鏡 (AFM) で結晶の成長を観察する.
- 原子レベルでシトラート-COMの相互作用をシミュレートするための分子モデリング.
主要な成果:
- シトラートの結合強度は,シトラートのCOO-グループとカルシウムイオンとの連携,そしてシトラートのOHグループとオキシラートの間の水素結合によって決定されます.
- 非平面のステップ幾何学,特に (101) 面では,シトラートにとって最も有利な結合部位を提供します.
- オキシラートとシトラートのCOO-グループ間の静電抵抗は, (010) 面での結合を減少させます.
結論:
- シトラートは, (101) COM面のステップに結合し,ステップの動きを抑制する高い選択性を示しています.
- アニゾトロピック相互作用の強さは,ステップ運動のアニゾトロピック変化を誘導し,マクロスコピックCOM結晶の習慣改変につながります.
- 分子スケールの成長動力学と大量結晶の形態学は,シミュレーションの結果と一致しています.
関連する概念動画
Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Formation of Complex Ions
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
Balancing Redox Equations
Electrochemistry is the science involved in the interconversion of electrical and chemical reactions. Such reactions are called reduction-oxidation, or redox reactions. These important reactions are defined by changes in oxidation states for one or more reactant elements and include a subset of reactions involving the transfer of electrons between reactant species. Electrochemistry as a field has evolved to yield sufficient insights on the fundamental principles of redox chemistry and multiple...
Electrolysis
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
Metal-Ligand Bonds
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
Acids, Bases and Neutralization Reactions
Acids and bases play several important roles in biology. The pH of a biological system can significantly impact the function of biological molecules, including enzymes, proteins, and nucleic acids. For example, enzymes have optimal pH ranges for their activity, and changes in pH can denature or alter their structure, affecting their function. Acids and bases also play a crucial role in cellular signaling and communication. The pH of the extracellular fluid around cells can influence the...


