| Literature DB >> 2829836 |
N C Millar1, J V Howarth, H Gutfreund.
Abstract
1. The enthalpy changes during individual reaction steps of the myosin subfragment 1 ATPase were studied with the use of a new stopped-flow calorimeter [Howarth, Millar & Gutfreund (1987) Biochem. J. 248, 677-682]. 2. At 5 degrees C and pH 7.0, the endothermic on-enzyme ATP-cleavage step was observed directly (delta H = +64 kJ.mol-1). 3. ADP binding is accompanied by a biphasic enthalpy change. 4. The release and uptake of protons was investigated by the use of two buffers with widely different heats of ionization. 5. Protons are involved in all four principal steps of the myosin subfragment 1 ATPase.Entities:
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Year: 1987 PMID: 2829836 PMCID: PMC1148603 DOI: 10.1042/bj2480683
Source DB: PubMed Journal: Biochem J ISSN: 0264-6021 Impact factor: 3.857