Inhibitory effect of squid (Todarodes pacificus) paramyosin on actomyosin ATPase and on superprecipitation.
1. Paramyosin from squid mantle muscle inhibited the Mg-ATPase and the superprecipitation activities of actomyosin. 2. The inhibition was detected only when paramyosin forms a cofilament with myosin. 3. ATP-induced changes in the morphology of the cofilament of myosin and paramyosin are involved in the inhibition by paramyosin.
Konno
K
K
Department of Food Science, Faculty of Fisheries, Hokkaido University, Japan.
Matsuura
M
M
Fujita
M
M
Miyagishima
Y
Y
Arai
K
K
D000205:Actomyosin / Q000037:antagonists & inhibitors / Q000302:isolation & purification; D000255:Adenosine Triphosphate / Q000494:pharmacology; D000818:Animals; D017301:Ca(2+) Mg(2+)-ATPase / Q000037:antagonists & inhibitors; D011232:Chemical Precipitation; D049832:Decapodiformes / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D066298:In Vitro Techniques; D008854:Microscopy, Electron; D009132:Muscles / Q000378:metabolism; D009218:Myosins / Q000037:antagonists & inhibitors* / Q000648:ultrastructure; D011817:Rabbits; D014335:Tropomyosin / Q000302:isolation & purification / Q000494:pharmacology* / Q000648:ultrastructure
D014335:Tropomyosin; D000255:Adenosine Triphosphate; D000205:Actomyosin; D017301:Ca(2+) Mg(2+)-ATPase; D009218:Myosins