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Photosynthesis Research

, Volume 84, Issue 1–3, pp 51–56 | Cite as

Effect of exogenous histidine on restoration of electron transfer on the donor side of Photosystem II depleted of Mn

  • A. A. Khorobrykh
  • V. V. Klimov
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Abstract

It is shown that restoration of photoinduced electron flow with added Mn2+ (measured by photoreduction of DCPIP and photoinduced change of chlorophyll fluorescence yield) in Mn-depleted Photosystem II (PS II) membrane fragments isolated from spinach chloroplasts, is considerably increased by exogenous histidine (His). The stimulating effect of His is not observed if other electron donors (NH2OH or diphenylcarbazide) are used instead of Mn2+. His added alone does not induce electron transfer in Mn-depleted PS II preparations. Investigation of pH dependence of the stimulating effect of 2 mM His shows that the effect is observed only at pH > 5.0, it gives a 50% activation around pH 6.0 and saturates at pH 7.0–7.5. Nearly 200 μM His is required for a 50 effect at pH 7.0. It is suggested that the added His can be involved in stimulation of electron transfer on the donor side of PS II through direct interaction of Mn2+ with deprotonated form(s) of His resulting in formation of Mn–His complexes capable of efficient electron donation to PS II (though it is not excluded that His serves as a base that takes part in proton exchange coupled with redox reactions on the donor side of PS II or as an electron donor to the oxidized Mn).

Keywords

histidine manganese Photosystem II water-oxidizing complex 

Abbreviations

ΔF

photoinduced change of chlorophyll fluorescence yield

DCPIP

2,6-dichlorophenol-indophenol

DPC

1,5-diphenylcarbazide

EDTA

ethylenediaminetetraacetic acid

His

histidine

P680

the primary electron donor of Photosystem II

PS II

Photosystem II

TyrZ

tyrosine 161 of D1 protein

WOC

the water-oxidizing complex

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Copyright information

© Springer 2005

Authors and Affiliations

  1. 1.Institute of Basic Biological ProblemsRussian Academy of SciencesPushchinoRussia

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