title: Autolysis of calcium-activated neutral protease of chicken skeletal muscle.
abstract: The conditions and process of autolysis of calcium-activated neutral protease (CANP) were examined. Optimal conditions for autolysis were the same as those required for expression of activity of CANP. The autolysis proceeded rapidly by a strictly limited proteolysis. During autolysis the molecular weight of CANP changed from 82 K (native CANP or mCANP) to 79 K and then 60 K. The 79 K and 60 K molecular species were both active at microM order of Ca2+ (muCANP), whereas the native CANP is active at mM order of Ca2+ (mCANP). Various proteases examined did not produce muCANP from mcanp under the conditions tested. Furthermore, muCANP did not yield muCANP from mCANP at lower Ca2+ concentrations where only muCANP was active. Therefore, muCANP is produced from mCANP only by the specific autolysis of mCANP.
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D002154:Calpain; D002645:Chickens; D004492:Edetic Acid / Q000494:pharmacology; D010450:Endopeptidases / Q000378:metabolism*; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D007976:Leupeptins / Q000494:pharmacology; D008970:Molecular Weight; D009132:Muscles / Q000201:enzymology*; D010447:Peptide Hydrolases / Q000378:metabolism; D011480:Protease Inhibitors; D013696:Temperature
chemical_list: D007976:Leupeptins; D011480:Protease Inhibitors; D004492:Edetic Acid; D010450:Endopeptidases; D010447:Peptide Hydrolases; D002154:Calpain; C032854:leupeptin; D002118:Calcium