Abstract
We have previously reported that transmembrane Ca2+ gradient-mediated changes in lipid fluidity could modulate the conformation and enzyme activity of sarcoplasmic reticulum (SR) Ca(2+)-ATPase. The aim of this paper is to explore the specificity of transmembrane Ca2+ gradient-mediated modulation of SR Ca(2+)-ATPase. The results showed that such specificity exhibited in two aspects: 1. The modulation could not be ascribed to transmembrane potential resulted from the transmembrane Ca2+ gradient, Dissipation of transmembrane potential by FCCP (carbonylcyanide-p-trifluoromethoxyphenylhydrazone) could not affect the activity of SR Ca(2+)-ATPase. 2. Transmembrane Sr2+ gradient had little effect on the enzyme activity of SR Ca(2+)-ATPase. A significant difference between the effect of transmembrane Ca2+ and Sr2+ gradient on the lipid fluidity was detected in the middle region of bilayer of Ca(2+)-ATPase incorporated proteoliposomes using a set of n-AS [n-(9-anthroyloxy) fatty acids] fluorescence polarization probes. It is known that Ca2+ binding domain of SR Ca(2+)-ATPase is just located in the middle region of bilayer, hence it may be deduced that possibly, membrane lipids are involved in transmembrane Ca2+ gradient-mediated modulation of Ca(2+)-ATPase.
| Original language | English |
|---|---|
| Pages (from-to) | 441-447 |
| Number of pages | 7 |
| Journal | Shi yan sheng wu xue bao = Journal of experimental biology |
| Volume | 26 |
| Issue number | 4 |
| State | Published - Dec 1993 |
| Externally published | Yes |
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All Science Journal Classification (ASJC) codes
- Medicine(all)
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The specificity of modulation of sarcoplasmic reticulum Ca(2+)-ATPase by transmembrane Ca2+ gradient. / Tu, Yaping; Xu, H.; Yang, F. Y.
In: Shi yan sheng wu xue bao = Journal of experimental biology, Vol. 26, No. 4, 12.1993, p. 441-447.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - The specificity of modulation of sarcoplasmic reticulum Ca(2+)-ATPase by transmembrane Ca2+ gradient
AU - Tu, Yaping
AU - Xu, H.
AU - Yang, F. Y.
PY - 1993/12
Y1 - 1993/12
N2 - We have previously reported that transmembrane Ca2+ gradient-mediated changes in lipid fluidity could modulate the conformation and enzyme activity of sarcoplasmic reticulum (SR) Ca(2+)-ATPase. The aim of this paper is to explore the specificity of transmembrane Ca2+ gradient-mediated modulation of SR Ca(2+)-ATPase. The results showed that such specificity exhibited in two aspects: 1. The modulation could not be ascribed to transmembrane potential resulted from the transmembrane Ca2+ gradient, Dissipation of transmembrane potential by FCCP (carbonylcyanide-p-trifluoromethoxyphenylhydrazone) could not affect the activity of SR Ca(2+)-ATPase. 2. Transmembrane Sr2+ gradient had little effect on the enzyme activity of SR Ca(2+)-ATPase. A significant difference between the effect of transmembrane Ca2+ and Sr2+ gradient on the lipid fluidity was detected in the middle region of bilayer of Ca(2+)-ATPase incorporated proteoliposomes using a set of n-AS [n-(9-anthroyloxy) fatty acids] fluorescence polarization probes. It is known that Ca2+ binding domain of SR Ca(2+)-ATPase is just located in the middle region of bilayer, hence it may be deduced that possibly, membrane lipids are involved in transmembrane Ca2+ gradient-mediated modulation of Ca(2+)-ATPase.
AB - We have previously reported that transmembrane Ca2+ gradient-mediated changes in lipid fluidity could modulate the conformation and enzyme activity of sarcoplasmic reticulum (SR) Ca(2+)-ATPase. The aim of this paper is to explore the specificity of transmembrane Ca2+ gradient-mediated modulation of SR Ca(2+)-ATPase. The results showed that such specificity exhibited in two aspects: 1. The modulation could not be ascribed to transmembrane potential resulted from the transmembrane Ca2+ gradient, Dissipation of transmembrane potential by FCCP (carbonylcyanide-p-trifluoromethoxyphenylhydrazone) could not affect the activity of SR Ca(2+)-ATPase. 2. Transmembrane Sr2+ gradient had little effect on the enzyme activity of SR Ca(2+)-ATPase. A significant difference between the effect of transmembrane Ca2+ and Sr2+ gradient on the lipid fluidity was detected in the middle region of bilayer of Ca(2+)-ATPase incorporated proteoliposomes using a set of n-AS [n-(9-anthroyloxy) fatty acids] fluorescence polarization probes. It is known that Ca2+ binding domain of SR Ca(2+)-ATPase is just located in the middle region of bilayer, hence it may be deduced that possibly, membrane lipids are involved in transmembrane Ca2+ gradient-mediated modulation of Ca(2+)-ATPase.
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UR - http://www.scopus.com/inward/citedby.url?scp=0027829218&partnerID=8YFLogxK
M3 - Article
C2 - 8023637
AN - SCOPUS:0027829218
VL - 26
SP - 441
EP - 447
JO - Journal of Molecular Cell Biology
JF - Journal of Molecular Cell Biology
SN - 1674-2788
IS - 4
ER -