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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Khorobrykh, Andrei A. Yanykin, Denis V. Klimov, Vyacheslav V. Khorobrykh, Sergey A. |
| Description | Author Affiliation: Yanykin DV ( Institute of Basic Biological Problems, Russian Academy of Sciences, Pushchino, Moscow Region, Russia.) |
| Abstract | Oxygen consumption in Mn-depleted photosystem II (PSII) preparations under continuous and pulsed illumination is investigated. It is shown that removal of manganese from the water-oxidizing complex (WOC) by high pH treatment leads to a 6-fold increase in the rate of O $_{2}$ photoconsumption. The use of exogenous electron acceptors and donors to PSII shows that in Mn-depleted PSII preparations along with the well-known effect of O $_{2}$ photoreduction on the acceptor side of PSII, there is light-induced O $_{2}$ consumption on the donor side of PSII (nearly 30% and 70%, respectively). It is suggested that the light-induced O $_{2}$ uptake on the donor side of PSII is related to interaction of O $_{2}$ with radicals produced by photooxidation of organic molecules. The study of flash-induced O $_{2}$ uptake finds that removal of Mn from the WOC leads to O $_{2}$ photoconsumption with maximum in the first flash, and its yield is comparable with the yield of O $_{2}$ evolution on the third flash measured in the PSII samples before Mn removal. The flash-induced O $_{2}$ uptake is drastically (by a factor of 1.8) activated by catalytic concentration (5–10 μM, corresponding to 2–4 Mn per RC) of Mn $^{2+}$ , while at higher concentrations (> 100 μM) Mn $^{2+}$ inhibits the O $_{2}$ photoconsumption (like other electron donors: ferrocyanide and diphenylcarbazide). Inhibitory pre-illumination of the Mn-depleted PSII preparations (resulting in the loss of electron donation from Mn $^{2+}$ ) leads to both suppression of flash-induced O $_{2}$ uptake and disappearance of the Mn-induced activation of the O $_{2}$ photoconsumption. We assume that the light-induced O $_{2}$ uptake in Mn-depleted PSII preparations may reflect not only the negative processes leading to photoinhibition but also possible participation of O $_{2}$ or its reactive forms in the formation of the inorganic core of the WOC. |
| ISSN | 00063002 |
| Journal | Biochimica et Biophysica Acta (BBA) - Reviews on Cancer |
| Issue Number | 4 |
| Volume Number | 1797 |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2010-04-01 |
| Publisher Place | Netherlands |
| Access Restriction | Open |
| Subject Keyword | Manganese Chemistry Oxygen Photosystem II Protein Complex Thylakoids Benzoquinones Metabolism Pharmacology Chlorophyll Electron Transport Drug Effects Radiation Effects Fluorescence Fluorometry Kinetics Models, Chemical Polarography Research Support, Non-U.S. Gov't Biochemistry |
| Content Type | Text |
| Resource Type | Article |
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