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A New Pathway of Photoinactivation of Photosystem II. Irreversible Photoreduction of Pheophytin Causes Loss of Photochemical Activity of Isolated D1–D2–Cytochrome b559 Complex

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Biochemistry (Moscow) : Volume 67, Issue 2, February 2002

Biochemistry (Moscow) : Volume 67, Issue 1, January 2002

Biochemistry (Moscow) : Volume 66

Biochemistry (Moscow) : Volume 65

A New Pathway of Photoinactivation of Photosystem II. Irreversible Photoreduction of Pheophytin Causes Loss of Photochemical Activity of Isolated D1–D2–Cytochrome b559 Complex

Content Provider	Springer Nature Link
Author	Nikitishena, O. V. Smolova, T. N. Khatypov, R. A. Shkuropatov, A. Ja. Klimov, V. V.
Copyright Year	2002
Abstract	A new pathway of photoinactivation of photosystem II (PS II) connected with irreversible photoaccumulation of reduced pheophytin (Ph) in isolated D1–D2–cytochrome b 559 complexes of reaction center (RC) of PS II was discovered. The inhibitory effects of white light illumination on photochemical activity of D1–D2–cytochrome b 559 complexes of RCs of photosystem II, isolated from pea chloroplasts, have been compared under anaerobic conditions in the absence and in the presence of sodium dithionite, electron transfer from which to the oxidized primary electron donor P680+ results in the photoaccumulation of anion-radical of the primary electron acceptor, PH. In both cases, prolonged illumination (1-5 min, 120 W/m2) led to a pronounced loss of the photochemical activity as it was monitored by measuring the amplitude of the reversible photoinduced absorbance changes at 682 nm related to the photoreduction of Ph. The extent of the photoinactivation depended on the illumination time and pH of the medium. At pH 8.0, the presence of dithionite during photoinactivation brought about a protective effect compared to that in a control sample. In contrast, lowering pH to 6.0 increased the sensitivity to photoinactivation in the dithionite containing samples. For 5 min irradiation, the photochemical activity in the absence and in the presence of dithionite decreased by 35 and 72%, respectively (this was accompanied by an irreversible bleaching of the pheophytin Qx absorption band at 542 nm). Degradation of the D1 and D2 proteins was not observed under these conditions. A subsequent addition of an electron acceptor, potassium ferricyanide, to the illuminated samples restored neither the amplitude of the signal at 682 nm nor absorption at 542 nm. It is suggested that at pH < 7.0 the photoaccumulated PH is irreversibly converted into a secondary, most probably protonated form, that does not lead to destruction of the RCs but prevents the photoformation of the primary radical pair [P680+PH]. A possible application of this effect to photoinactivation of PS II in vivo is discussed.
Starting Page	364
Ending Page	371
Page Count	8
File Format	PDF
ISSN	00062979
Journal	Biochemistry (Moscow)
Volume Number	67
Issue Number	3
e-ISSN	16083040
Language	English
Publisher	Kluwer Academic Publishers-Plenum Publishers
Publisher Date	2002-01-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biochemistry
Content Type	Text
Resource Type	Article
Subject	Biochemistry Biophysics Geriatrics and Gerontology

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A New Pathway of Photoinactivation of Photosystem II. Irreversible Photoreduction of Pheophytin Causes Loss of Photochemical Activity of Isolated D1–D2–Cytochrome b559 Complex

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