Biological Electron Transfer Chains: Genetics, Composition by P. L. Dutton, X. Chen, C. C. Page, S. Huang, T. Ohnishi, C.

By P. L. Dutton, X. Chen, C. C. Page, S. Huang, T. Ohnishi, C. C. Moser (auth.), G. W. Canters, E. Vijgenboom (eds.)

From may perhaps 3-7,1997, the NATO complex study Workshop on 'Biological Electron move Chains' used to be prepared in Tomar, Portugal. within the program for aid the alternative of the subject was once justified as follows: "[Until lately efforts] have focused on the research of the constitution and serve as of person redox enzymes and proteins. sufficient info is now to be had to make a commence with the examine of organic electron move (E1) on the subsequent greater point of association, that of the whole ET chain." The curiosity within the workshop used to be excessive: the vast majority of contributors had registered prior to the workshop was once officially introduced, which illustrates the recognition of the subject in the biochemical and biophysical groups. the current quantity incorporates a variety of studies in line with the lectures provided by means of the most important audio system throughout the assembly. The workshop handled the subsequent 3 issues: a) Electron move, that is the topic of bankruptcy 1. The research of ET on the molecular point remains to be basic for an figuring out of the way ET chains function in vivo. After forty years of study the contours of the topic have gotten transparent now. b) Bacterial redox chains. this can be the topic of bankruptcy 2. Its contents exhibit how advanced those chains could be, usually regarding a couple of gene clusters. Our figuring out of the regulatory points and keep an eye on mechanisms of those chains is just in its beginning.

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Extra info for Biological Electron Transfer Chains: Genetics, Composition and Mode of Operation

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N. (1994), Electron transfer in proteins: a novel approach for 1he description of 1he donor-acceptor, J. Phys. Chem. '8, 3379-3388. 41. (a) Farver, O. and Pecht, L (1997) The role of 1he medium on long range electron transfer, JBIC, in press. , Vlinngird, T. and Pecht, L (1997), submitted for publication. 42. , (1997) Secondary structure conformations and long range electronic interactions in oligopeptides. 1 Phys. Chem. B. 101, 2986-2991. 43. N. (1997) Structural fluctuations, spin, reorganization energy, and tunneling energy control of intramolecular electron transfer (1997) 1 Am.

The low-temperature transition state may still have a moderate activation energy E~, depending upon the redox potential, and hence may be reached at low temperature. 1G, (9) where qo and Xo are the equilibrium values of q and X for the product. The intersection line is given by equation (10) where the total reorganization energy (11) is a sum of partial reorganization energies for modes q and X, 1 2 '\ II. X =2'1 X20 The minimum on the intersection line (10) is reached at q = q. and X=X. +AG • - 0 2A.

YI , l" /12. " -I Figure 5. Simple examples of electron transfer contact maps (ETCMs) for the a-helical peptide of Figure 4. (a) ETCM showing electronic coupling between any pair of unbranched-backbone orbitals i. j (only the coupling mediated solely by the branched portion of the peptide is plotted). The x and y axes represent unbranched backbone orbitals ordered as in (b). The grid lines separate adjacent residues. The strongest couplings that connect non-adjacent residues are between all residue pairs k and k+3(4).

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