頁籤選單縮合
題 名 | Mg NMR Relaxation Study of Mg[fec7]-ATP Complexation in Solutions |
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作 者 | 沈志賢; 羅滋君; 黃良平; | 書刊名 | Journal of the Chinese Chemical Society |
卷 期 | 46:5 1999.10[民88.10] |
頁 次 | 頁759-770 |
分類號 | 364.6 |
關鍵詞 | Mg[fec7]; ATP; Complexation; NMR relaxation; |
語 文 | 英文(English) |
英文摘要 | □Mg NMR relaxation has been applied to characterize the kinetic and dynamic parameters in the complexation process of the Mg �� ion with adenosine triphosphate. A modified linear prediction with singular value decomposition method developed earlier is used to obtain the preliminary chemical shift separation between the free □ Mg �� ion and the □ Mg �� -ATP complex. Then the □ Mg �� NMR null point spectra is invoked to find the chemical shift separation and the quadrupolar coupling constant of the complex. With the knowledge of those parameters, T �� and line width data at 30.62 MHz and 18.37 MHz can be analyzed to determine the correlation times for the fluctuation of electric field gradient at □ Mg and the dissociation rate constants of the complex at the temperature range of 270-320 K. An activation energy of 8.8 kcal/mol for dissociation rate constant is obtained. It is also found that the reorientational motion of the □ Mg �� -ATP complex is not significantly affected by the formation of ATP aggregates. A similar conclusion is further obtained by comparing the T �� data of β - □ P in ATP and Mg �� -ATP solutions. |
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