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The electron transfer equilibrium and kinetics between azurin from Alruli~enr.s,fueru/i.s and cytochrome r~s I from Pseudomonas aeruginosa have been studied. The equilibrium constant. [Az(IIj]) = 0.5 at 25°C is about seven times smaller than that observed between the cytochrome c5s1 and the azurin both from P. ae~ugizzosa [Rosen, P. and Pecht,1. ( 1 976 The kinetics of the reaction between Akaligenc~s azurin and Pseudomonas r~torlz~oznc cSs1 were investigated by the temperature-jump chemical relaxation method. Only a single relaxation mode was observed throughout the range of concentrations and temperatures examined. Thus, the slow relaxation time observed in the reaction betwecn P. acwginosu azurin and cytochrome cSs1 is not observed with the AIc~ligezz~.~ azurin. The simplest mechanism that can therefore be ascribed to the investigated system is:This scheme is similar to that proposed earlier for the reaction between P. ucmginosa azurin and cytochrome ~' 5 5~ but does not involve the conformational transition proposed for azurin. The specific rates for the elcctron transfcr are still fast: 1

One-electron reducing agents dissolve oxides containing FeIII including 'insoluble' nickel ferrite ; the mechanisms of such reactions can be interpreted by analogy with homogeneous electron-transfer reactions.