Enrichment of Na+-Ca2+ exchange in cardiac sarcolemmal vesicles by alkaline extraction.
Enrichment of Na+-Ca2+ exchange in cardiac sarcolemmal vesicles by alkaline extraction.
复制标题
通过碱提取富集心脏肌膜囊泡中的 Na -Ca2 交换。
DOI:
10.1016/0005-2736(87)90239-2
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发表时间:
1987
期刊:
影响因子:
--
通讯作者:
Ward,R
中科院分区:
文献类型:
--
作者:
Philipson,KD;McDonough,AA;Frank,JS;Ward,R
Exposure of canine cardiac sarcolemmal vesicles to alkaline media (⩾ pH 12) results in the extraction of 33% of the protein. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis shows that specific proteins are being solubilized. Most of the phospholipid and sialic acid remains with the pellet after centrifugation. Electron microscopy reveals that alkaline treatment does not cause gross morphological damage to the vesicles, although freeze-fracture demonstrates some aggregation of intramembrane particles. The data indicate that high pH probably removes peripheral proteins and leaves the integral proteins in place. We find complete recovery of Na+-Ca2+exchange activity in alkaline-extracted membranes after solubilization and reconstitution. These vesicles contain only 50% of the protein of vesicles reconstituted from control sarcolemma. Thus, the specific activity of Na+-Ca2+exchange is doubled. Alkaline extraction is a useful and reproducible procedure for enrichment of the Na+-Ca2+exchange protein. NNa++ K+)-ATPase is completely inactivated by exposure to pH 12 medium though immunodetection shows that the (Na++ K+)-ATPase proteins are not extracted. We detect both α andα+ forms of (Na++ K+)-ATPase and deduce that the Na+pump proteins do not comprise a major fraction of sarcolemmal protein.
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DOI:
10.1016/0005-2736(82)90478-3
发表时间:
1982
期刊:
Biochimica et biophysica acta
影响因子:
--
作者:
S. Wakabayashi;K. Goshima
通讯作者:
K. Goshima
DOI:
--
发表时间:
1986
期刊:
The Journal of biological chemistry
影响因子:
--
作者:
Schmitt,CA;McDonough,AA
通讯作者:
McDonough,AA
影响因子:
4.8
作者:
H. Miyamoto;E. Racker
通讯作者:
E. Racker
DOI:
--
发表时间:
1986
期刊:
Biochimica et Biophysica Acta
影响因子:
--
作者:
P. Lundahl;E. Greijer;S. Cardell;E. Mascher;L. Andersson
通讯作者:
L. Andersson
DOI:
10.1016/s0070-2161(08)60875-8
发表时间:
1984
期刊:
Current topics in membranes and transport
影响因子:
--
作者:
A. McDonough
通讯作者:
A. McDonough