Interaction of cardiac Na-Ca exchanger and exchange inhibitory peptide with membrane phospholipids.
Interaction of cardiac Na-Ca exchanger and exchange inhibitory peptide with membrane phospholipids.
复制标题
心脏 Na-Ca 交换器和交换抑制肽与膜磷脂的相互作用。
DOI:
10.1152/ajpcell.1994.266.5.c1350
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发表时间:
1994
期刊:
影响因子:
--
通讯作者:
Milanick,MA
中科院分区:
文献类型:
--
作者:
Shannon,TR;Hale,CC;Milanick,MA
We tested the hypothesis that the exchange inhibitory peptide (XIP) domain in the cardiac Na-Ca exchanger is a regulatory site under the control of the membrane lipid environment. We found that 125I-XIP bound to liposomes composed of phosphatidylcholine (PC) and phosphatidylserine (PS) with peak binding at 1:1 PC/PS. No binding was observed in PC liposomes. XIP and pentalysine-inhibitable bovine sarcolemmal (SL) Na-Ca exchange activity was observed in reconstituted proteoliposomes composed of 1:1 PC/PS. Proteolysis of SL membranes resulted in a twofold stimulation of Na-Ca exchange activity, but the half-maximal inhibitory concentration (IC50) for XIP (3 microM) was not significantly changed, suggesting that the XIP binding site remained intact. In contrast, the IC50 for pentalysine was decreased from 500 to 150 microM in proteolyzed membranes. These data are consistent with a model of Na-Ca exchange regulation in which the endogenous XIP domain interacts either with another region of the exchange protein to induce an inactive conformational state or with membrane lipid to produce an active conformation.
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影响因子:
5.5
作者:
HILGEMANN, DW;COLLINS, A
通讯作者:
COLLINS, A
DOI:
--
发表时间:
1982
期刊:
Journal of Biochemistry (Tokyo)
影响因子:
--
作者:
H. Kuwayama;T. Kanazawa
通讯作者:
T. Kanazawa
影响因子:
3.9
作者:
C. Foster;M. V. Van Fleet;A. Marshak
通讯作者:
A. Marshak
DOI:
--
发表时间:
1990
期刊:
Cell Biology International Reports
影响因子:
--
作者:
K. Philipson
通讯作者:
K. Philipson
影响因子:
3.4
作者:
KIM, JY;MOSIOR, M;MCLAUGHLIN, S
通讯作者:
MCLAUGHLIN, S