Volume changes associated with cytochrome c oxidase-porphyrin cytochrome c equilibrium
- 1 December 1984
- journal article
- research article
- Published by American Chemical Society (ACS) in Biochemistry
- Vol. 23 (25), 5906-5911
- https://doi.org/10.1021/bi00320a003
Abstract
The binding of a fluorescent derivative of cytochrome c to cytochrome c oxidase was studied by use of pressure to perturb the equilibrium. .DELTA.V.degree. for the reaction oxidase-porphyrin cytochrome c .**GRAPHIC**. oxidase + porphyrin cytochrome c was small and favored dissociation of the complex. Pressure-induced dissociation is to be expected if the major forces governing the equilibrium are electrostatic in nature. The dependence of log Kd on pressure is not linear but biphasic; high pressures lead to a decrease in Kd and association of the reactants. The latter fact indicates that the net compressibility of the complexes is greater than that of the free reactants, an unexpected result.This publication has 24 references indexed in Scilit:
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