Enzyme-Catalyzed Electron and Radical Transfer by Andreas Holzenburg, Nigel S. Scrutton

By Andreas Holzenburg, Nigel S. Scrutton

Dramatic advances were made in recent times within the box of redox enzymology which has ended in a rise of study actions. This quantity will hide the hot milestone advancements during this box via major specialists, uniting conception and scan, and choosing contributions to demonstrate very important elements of the mechanisms of electron and radical move in proteins. beneficial properties: an indication of the foremost ideas controlling organic redox reactions; Experimental stories of `simple' soluble platforms in quite a few enzyme familiies to demonstrate techniques within the regulate of electron move reactions; aspect of advances made in membrane electron move via structural descriptions of key membrane-embedded proteins; attract these attracted to the layout and use of redox enzymes, from teachers to industrialists.

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Extra info for Enzyme-Catalyzed Electron and Radical Transfer

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The Marcus expression can be understood in terms of reactant and product potential surfaces approximated as simple harmonic oscillations of the nuclei. The equilibrium position of the nuclei at the bottom of the reactant potential well (1) changes to a new equilibrium position in the product potential well (2) releasing free energy ∆G. The energy required to distort the reactant nuclei (1) so that they resemble the product equilibrium geometry, but without allowing electron transfer (3) defines the reorganization energy λ .

Acta 590 :273ñ276. , Lao, K. , and Boxer, S. , 1992, Electric-Field Effects On Kinetics Of ElectronTransfer Reactions: Connection Between Experiment and Theory Chem. Phys. Lett. 197 :380ñ388. Giangiacomo, K. , and Dutton, P. , 1989, In Photosynthetic Reaction Centers, the FreeEnergy Difference for Electron-Transfer Between Quinones Bound at the Primary and Secondary Quinone-Binding Sites Governs the Observed Secondary Site Specificity Proc. Natl. Acad. Sci. U. S. A. 86 :2658ñ2662. Gunner, M. , and Dutton, P.

FC in Eq. (6) rather than the commonly used Marcus expression of Eq. (3). Second, the activation energy measured may instead be of a reaction coupled to electron transfer, such as proton binding or release or diffusional motions of redox centers, rather than the electron tunneling itself. 5eV (Davidson, 1996) or if the rates seem to be significantly slower than that predicted by Eq. (7). Thus the variation of the free energy of the reaction by chemical or even applied electric field methods provides the most secure way to determine if the observed rate is limited by the rate of electron tunneling.

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