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J. Biol. Chem., Vol. 262, Issue 2, 595-604, Jan, 1987
GM Baker, M Noguchi and G Palmer
The magnitude of the slow phase of reaction of cytochrome oxidase with
cyanide has been correlated with the size of the epr signal at g' = 12.
This epr signal was not found in submitochondrial particles, and
significant g' = 12 epr was only observed late in the purification of
solubilized enzyme. The Hartzell-Beinert procedure for the purification of
cytochrome oxidase (Hartzell, C.R., and Beinert, H. (1974) Biochim.
Biophys. Acta 368, 318-338) has been modified so that the purified enzyme
reacts in a single rapid phase with potassium cyanide and lacks the g' = 12
epr signal. This enzyme could be converted to the slowly reacting form upon
incubation at low pH and/or low enzyme concentration. No procedure for the
stable reversal of the process could be found. Some physical and chemical
properties of the two forms of the enzyme are compared.
The reaction of cytochrome oxidase with cyanide. Preparation of the rapidly reacting form and its conversion to the slowly reacting form
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