pH sensitivity of myosin adenosine triphosphatase and subtypes of myofibres in porcine muscle.
Myofibres from pig were classified generally into two types based on their reaction for myosin ATPase. Type I had a strong reaction for acid-stable myosin ATPase and a weak or negative reaction for alkali-stable ATPase; type II had the reciprocal properties. Types SM, SS and MS were defined and considered to represent types intermediate between I and II; they possibly reflect the dynamic situation of transformation of properties. Experimental results showed the sensitivity of the histochemically demonstrated enzyme to small shifts in pH.
D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000818:Animals; D006651:Histocytochemistry; D006863:Hydrogen-Ion Concentration; D008406:Masseter Muscle / Q000201:enzymology; D009132:Muscles / Q000033:anatomy & histology / Q000201:enzymology*; D009218:Myosins; D013552:Swine
D000251:Adenosine Triphosphatases; D009218:Myosins