Thu, 21 Aug 2008 04:49:25 BST CiteULike: llchristensens Mines http://www.citeulike.org/user/llchristensen/author/Mines CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/llchristensen/article/2602191 <i>Journal of Bioenergetics and Biomembranes, Vol. 27, No. 3. (1 June 1995), pp. 295-302.</i><br /><br />Photochemical techniques have been used to measure the kinetics of intramolecular electron transfer in Ru(bpy)2(im)(His)2+-modified (bpy = 2,2′-bipyridine; im = imidazole) cytochromec and azurin. A driving-force study with the His33 derivatives of cytochromec indicates that the reorganization energy (γ) for Fe2+→Ru3+ ET reactions is 0.8 eV. Reductions of the ferriheme by either an excited complex,*Ru2+, or a reduced complex, Ru+, are anomalously fast and may involve formation of an electronically excited ferroheme. The distance dependence of Fe2+→Ru3+ and Cu+→Ru3+ electron transfer in 12 different Ru-modified cytochromes and azurins has been analyzed using a tunneling-pathway model. The ET rates in 10 of the 12 systems exhibit an exponential dependence on metal-metal separation (decay constant of 1.06 å−1) that is consistent with predictions of the pathway model. Electron transfer in ruthenium-modified proteins Morten Bjerrum Danilo Casimiro Chang Angel Di Bilio Harry Gray Michael Hill Ralf Langen Gary Mines Lars Skov Jay Winkler Deborah Wuttke doi:10.1007/BF02110099 Journal of Bioenergetics and Biomembranes, Vol. 27, No. 3. (1 June 1995), pp. 295-302. 2008-03-27T14:33:09-00:00 1995 Journal of Bioenergetics and Biomembranes 27 3 295 302 electron gray harry transfer