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The photoproduction of superoxide radicals and the superoxide dismutase activity of Photosystem II. The possible involvement of cytochrome b559

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Abstract

In the present study the light induced formation of superoxide and intrinsic superoxide dismutase (SOD) activity in PS II membrane fragments and D1/D2/Cytb559-complexes from spinach have been analyzed by the use of ferricytochrome c (cyt c(III)) reduction and xanthine/xanthine oxidase as assay systems. The following results were obtained: 1.) Photoreduction of Cyt c (III) by PS II membrane fragments is induced by addition of sodium azide, tetracyane ethylene (TCNE) or carbonylcyanide-p-trifluoromethoxy-phenylhydrazone (FCCP) and after removal of the extrinsic polypeptides by a 1M CaCl2-treatment. This activity which is absent in control samples becomes completely inhibited by the addition of exogenous SOD. 2.) The TCNE induced cyt c(III) photoreduction by PS II membrane fragments was found to be characterized by a half maximal concentration of c1/2=10 μM TCNE. Simultaneously, TCNE inhibits the oxygen evolution rate of PS II membrane fragments with c1/2≈ 3 μM. 3.) The photoproduction of O2 is coupled with H+-uptake. This effect is diminished by the addition of the O2 -trap cyt c(III). 4.) D1/D2/Cytb559-complexes and PS II membrane fragments deprived of the extrinsic proteins and manganese exhibit no SOD-activity but are capable of producing O2 in the light if a PS II electron donor is added.

Based on these results the site(s) of light induced superoxide formation in PS II is (are) inferred to be located at the acceptor side. A part of the PS II donor side and Cyt b559 in its HP-form are proposed to provide an intrinsic superoxide dismutase (SOD) activity.

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Abbreviations

ADRY:

acceleration of the deactivation reactions of the water-splitting system Y

ANT-2p:

2-(3-chloro-4-trifluoromethyl)anilino-3,5-dinitrothiophene

BCP:

bromocresol purple

cyt:

cytochrome

Cyt c:

cytochrome c

DCIP:

2,6-dichlorophenol-indophenol

DCMU:

3-(3,4-dichlorophenyl)-1,1-dimethylurea

DEDTC:

Diethyldithiocarbamate

DMBQ:

2,5-dimethyl-p-benzoquinone

DPC:

1,5-diphenylcarbazide

FCCP:

carbonylcyanide-p-trifluoro/methoxy-phenylhydrazone

HP:

high potential

LP:

low potential

MES:

2-(N-morpholino)ethanesulfonic acid

NADP:

nicotinamide adenine dinucleotide phosphate

SOD:

superoxide dismutase

TCNE:

tetracyane ethylene

TEMED:

N,N,N′,N′-tetramethylethylenediamine

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Ananyev, G., Renger, G., Wacker, U. et al. The photoproduction of superoxide radicals and the superoxide dismutase activity of Photosystem II. The possible involvement of cytochrome b559. Photosynth Res 41, 327–338 (1994). https://doi.org/10.1007/BF00019410

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