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Biophysical Journal 65: 1059-1065 (1993)
© 1993 the Biophysical Society

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Responses of two protein-protein complexes to solvent stress: does water play a role at the interface?

J A Kornblatt, M J Kornblatt, G H Hoa and A G Mauk

Department of Biology, Concordia University, Montreal, Quebec, Canada.

ABSTRACT

We have analyzed the stability of the cytochrome c-cytochrome b5 and cytochrome c-cytochrome c oxidase complexes as a function of solvent stress. High concentrations of glycerol were used to displace the two equilibria. Glycerol promotes complex formation between cytochrome c and cytochrome b5 but inhibits that between cytochrome c and cytochrome c oxidase. The results with cytochrome b5 and cytochrome c were expected; the association of this complex is largely entropy driven. Our interpretation is that the cytochrome c-cytochrome b5 complex excludes water. The results with the cytochrome c oxidase and cytochrome c couple were not expected. We interpret them to mean that either glycerol is binding to the oxidase, thereby displacing the cytochrome c, or that water is required at this protein-protein interface. A requirement for substantial quantities of water at the interface of some protein complexes is logical but has been reported only once.




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Copyright © 1993 by the Biophysical Society.