Electrogenicity of electron and proton transfer at the oxidizing side of photosystem IIстатья

Статья опубликована в высокорейтинговом журнале

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[1] Haumann M., Mulkidjanian A., Junge W. Electrogenicity of electron and proton transfer at the oxidizing side of photosystem ii // Biochemistry. — 1997. — Vol. 36, no. 31. — P. 9304–9315. The electrogenicity of electron and proton transfer at the oxidizing side of PSII was monitored by transmembrane electrochromism of carotenoids in thylakoids and, independently, by electrometry in oxygen-evolving photosystem II core particles. It yielded dielectrically weighted distances between cofactors, They were related to the one between Y-Z(ox) and Q(A)(-) (=100%). The electron transfer from Y-Z to P-680(+) ranged over a relative distance of 15%, while the one from Mn-4 to Y-Z(ox) ranged over less than 3.5%. The latter result placed Mn-4 and Y-Z at about the same weighted depth in the membrane. The oxidation of cofactor X by Y-Z(ox) during S-2 –> S-3 ranged over 10%. We tentatively attributed 7% to proton transfer into the lumen and 3% to electron transfer, in line with our notion that one proton is liberated from X-ox itself. This placed X at the same depth in the membrane as Mn. Proton release upon the final oxidation of water during the oxygen-evolving step S-4 –> S-0 revealed relative electrogenic components of 5.5% in care particles and between 10.5% (pH 7.4) and 2% (pH 6.2) in thylakoids. The former likely reflected proton transfer from bound water into the lumen and the latter to intraprotein bases that were created in the foregoing transitions, A tentative scheme for the arrangement of cofactors al the oxidizing side of photosystem II is presented. [ DOI ]

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