title: ADP-ribosylation of Ca2+-dependent ATPase in vitro suppresses the enzyme activity.
abstract: We investigated the effect on the Ca2+-dependent ATPase activity of ADP-ribosylation of the enzyme from the rabbit skeletal muscle sarcoplasmic reticulum. A reconstituted ADP-ribosylation system of Ca2+-dependent ATPase in which the enzyme and ADP-ribosyltransferase, both were partially purified from the vesicles, and poly L-lysine were contained, was preincubated with 1 mM NAD, and the Ca2+-dependent ATPase activity was assayed. The NAD-dependent suppression of the enzyme activity depended on both the concentration of NAD and preincubation-time for the ADP-ribosylation, and was reversed by adding 20 mM arginine during the preincubation. These results taken together with the findings that Ca2+-dependent ATPase is a major acceptor protein for the modification in rabbit skeletal muscle sarcoplasmic reticulum [Hara et al. (1987) Biochem. Biophys. Res. Commun. 144; 856-862] suggest that Ca2+-transport in the sarcoplasmic reticulum may be regulated through changes in the rate of ADP-ribosylation of Ca2+-dependent ATPase.
mesh_terms: D000246:Adenosine Diphosphate Ribose / Q000378:metabolism*; D000818:Animals; D002118:Calcium / Q000378:metabolism; D000252:Calcium-Transporting ATPases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D066298:In Vitro Techniques; D007700:Kinetics; D009243:NAD / Q000378:metabolism; D010430:Pentosyltransferases / Q000378:metabolism*; D011107:Polylysine / Q000378:metabolism; D011817:Rabbits; D012519:Sarcoplasmic Reticulum / Q000201:enzymology*; D013329:Structure-Activity Relationship
chemical_list: D009243:NAD; D000246:Adenosine Diphosphate Ribose; D011107:Polylysine; D010430:Pentosyltransferases; D000252:Calcium-Transporting ATPases; D002118:Calcium