Biologically active fluorescent derivatives of spinach calmodulin that report calmodulin target protein binding.
Biologically active fluorescent derivatives of spinach calmodulin that report calmodulin target protein binding.
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菠菜钙调蛋白的生物活性荧光衍生物,可报告钙调蛋白靶蛋白的结合。
DOI:
10.1021/bi00403a023
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发表时间:
1988
期刊:
影响因子:
2.9
通讯作者:
Johnson,JD
中科院分区:
文献类型:
--
作者:
Mills,JS;Walsh,MP;Nemcek,K;Johnson,JD
Revised Manuscript Received September 28, 1987 abstract: Spinach calmodulin (CaM) has been labeled at cysteine-26 with the sulfhydryl-selective probe 2-(4-maleimidoanilino) naphthalene-6-sulfonic acid (MIANS) to produce MIANS-CaM. The interaction of MIANS-CaM with CaM binding proteins was studied by fluorescence enhancement accompanying the protein-protein interactions. MIANS-CaM bound to smooth muscle myosin light-chain kinase with a Kd of 9 nM, causing a 4.6-fold fluorescence enhancement. Caldesmon bound with a Kd of 250 nM, causing a 2-fold fluorescence enhancement. Calcineurin (CaN) boundto MIANS-CaM with a Kd< 5 nM, causing an 80% increase in fluorescence. On the other hand, binding of the CaM antagonist drugs prenylamine and calmidazolium or the potent peptide antagonist melittin did not alter MIANS fluorescence. MI-ANS-CaM activated brain cGMP phosphodiesterase and CaN as effectively as unlabeled CaM. Spinach CaM was also labeled with three other sulfhydryl reagents, 6-acryloyl-2-(dimethylamino) naphthalene,(2, 5-dimethoxy-4-stilbenyl) maleimide, and rhodamine X maleimide. CaN bound to the highly fluorescent rhodamine X maleimidyl-CaM with a Kd of 1.4 nM, causing a 25% increase in polarization. Both MIANS-CaM and rhodamine X-CaM were used to monitor the Ca2+ dependence of the interaction between CaM and CaN. Half-maximal binding occurredat pCa 6.7-6.8 in the absence of Mg2+, or at pCa 6.3 in the presence of 3 mM Mg2+. In both cases, the dependence of the interaction was cooperative with respect to Ca2+(Hill coefficients of 1.7-2.0). Use of these fluorescent CaMs should allow accurate monitoring of CaM interactions with its target proteinsand perhaps their localization within the cell.
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DOI:
10.1016/s0021-9258(19)69586-4
发表时间:
1981
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Anne Conti;Adelstein
通讯作者:
Adelstein
DOI:
10.1016/s0021-9258(19)57507-x
发表时间:
1986
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Timothy Clark;Philip;Ngai;Cindy Sutherland;Ute Groschel;Michael P. Walshs
通讯作者:
Michael P. Walshs
影响因子:
4.1
作者:
P. Ngai;C. A. Carruthers;M. Walsh
通讯作者:
M. Walsh
影响因子:
4.1
作者:
JOHNSON, JD;WITTENAUER, LA
通讯作者:
WITTENAUER, LA
影响因子:
2.9
作者:
SECRIST, JA;WEBER, G;BARRIO, JR
通讯作者:
BARRIO, JR