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Creatine kinase thermal aggregation kinetics has been studied in 30 mM Hepes-NaOH buffer, pH 8.0, at two temperatures: 50.6 and 60°C. Aggregation kinetics was analyzed by measuring the growth of apparent absorption (A) at 400 nm. It was found that the limiting value of apparent absorption (Alim) is proportional to protein concentration at both temperatures. The first order rate constant (kI) does...
The courses of refolding and reactivation of urea-denatured creatine kinase (CK) (ATP:creatine N-phosphotrans-ferase, EC 2.7.3.2) have been studied in the absence and presence of zinc ions. The presence of Zn2+ at low concentrations blocks the reactivation and refolding of urea-denatured CK and keeps it in a partially folded state. The partially folded state proved to be a monomeric state which resembles...
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