THE EFFECT OF PH ON RATE CONSTANTS, ION SELECTIVITY AND THERMODYNAMIC PROPERTIES OF FLUORESCENT CALCIUM AND MAGNESIUM INDICATORS

被引：153

作者：

LATTANZIO, FA ^{[1
]}

BARTSCHAT, DK ^{[1
]}

机构：

[1] EASTERN VIRGINIA MED SCH,DEPT PHYSIOL,NORFOLK,VA 23501

来源：

BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS | 1991年 / 177卷 / 01期

关键词：

D O I：

10.1016/0006-291X(91)91966-G

中图分类号：

Q5 [生物化学]; Q7 [分子生物学];

学科分类号：

071010 ; 081704 ;

摘要：

Fluorescent calcium indicators fluo-3, fura-2 and indo-1, and fluorescent magnesium indicators mag-fura-2 (FURAPTRA) and mag-indo-1 were evaluated for the effects of pH on their association and dissociation rates, ion selectivity and thermodynamic properties. Calcium indicator affinities for Ca and Mg were reduced and the discrimination between Ca and Mg decreased in fura-2 and indo-1 at acidic pH. Alterations in apparent dissociation constants were caused primarily by reduced association rates. Magnesium indicators did not show these changes. The enthalphies of the calcium indicators' Ca complex were 1-3 kcal/mole and magnesium indicators' Mg complex were 7-9 kcal/mole. The potential effects of a biexponential dissociation rate of fluo-3 and of Ca interactions with magnesium indicators were examined. © 1991.

引用

页码：184 / 191

页数：8

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