Comparative biochemical study of sarcolemma and sarcoplasmic reticulum fractions isolated from mouse skeletal and cardiac muscles.
1. Ca-ATPase activity, calcium-binding proteins and Concanavalin-A-bound glycoproteins of sarcolemma and sarcoplasmic reticulum were compared in mouse cardiac and skeletal muscles. 2. Ca-ATPase activity and calsequestrin were quite reduced in cardiac muscle, and the quantity of calcium bound to these two proteins was practically negligible, contrary to what was observed with skeletal muscle. In addition, the quantity of lipid bound calcium was not greater in cardiac muscle than in skeletal muscle. 3. Certain proteins seemed exclusively specific for skeletal muscle, including a 30,000 mol. wt glycoprotein which was totally absent in cardiac muscle sarcolemma.
Laboratoire de Physiologie, U.E.R. de Médecine, Nantes, France.
B
B
Lucas-Heron
M J
MJ
Loirat
B
B
Ollivier
D000818:Animals; D002118:Calcium / Q000378:metabolism; D002132:Calcium Radioisotopes; D002458:Cell Fractionation; D004591:Electrophoresis, Polyacrylamide Gel; D006023:Glycoproteins / Q000378:metabolism; D050356:Lipid Metabolism; D051379:Mice; D009132:Muscles / Q000378:metabolism*; D009206:Myocardium / Q000378:metabolism*; D012508:Sarcolemma / Q000378:metabolism*; D012519:Sarcoplasmic Reticulum / Q000378:metabolism*
D002132:Calcium Radioisotopes; D006023:Glycoproteins; D002118:Calcium