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Abstract
Decomposition of phosphoenzyme (E ∼ P) in sarcoplasmic reticulum isolated from caudofemoralis, tibialis and soleus of cat hind leg skeletal muscles was studied under various conditions of monovalent cations. In the presence of Li +, Na + and K + chosen for E ∼ P formation and decomposition after quenching of E ∼ P with EGTA, E ∼ P in the caudofemoralis and tibialis sarcoplasmic reticulum decomposed faster than that in the soleus sarcoplasmic reticulum. Quenching the E ∼ P formation with EGTA and ADP revealed that 30–40% of the total E ∼ P formed in all types of sarcoplasmic reticulum was ‘ADP sensitive’. Decomposition of the remaining E ∼ P in caudofemoralis and tibialis sarcoplasmic reticulum was enhanced by ADP, which resulted in a multiphasic decomposition pattern. A larger portion of the remaining E ∼ P in the soleus sarcoplasmic reticulum, on the other hand, decomposed in a monophasic manner and was not significantly influenced by ADP. The data on E ∼ P decomposition clearly differentiate between the fast and slow muscle types.
Published Version
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