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Glycinebetaine protects the D1/D2/Cytb559 complex of photosystem II against photo-induced and heat-induced inactivation
Authors:Allakhverdiev Suleyman I  Hayashi Hidenori  Nishiyama Yoshitaka  Ivanov Alexander G  Aliev Jalal A  Klimov Vyacheslav V  Murata Norio  Carpentier Robert
Affiliation:Department of Regulation Biology, National Institute for Basic Biology, Okazaki 444-8585, Japan.
Abstract:The presence of 1.0 mol/L glycinebetaine during isolation of D1/D2/Cytb559 reaction centre (RC) complexes from photosystem II (PSII) membrane fragments preserved the photochemical activity, monitored as the light-induced reduction of pheophytin and electron transport from diphenylcarbazide to 2.6-dichlorophenol-indophenol.-Glycinebetaine also protected the D1/D2/Cytb559 complexes against strong light-induced damage to the photochemical reactions and the irreversible bleaching of beta-carotene and chlorophyll. The presence of glycinebetaine also enhanced thermotolerance of the D1/D2/Cytb559 complexes isolated in the presence of 1.0 mol/L betaine with an increase in the temperature for 50% inactivation from 29 degrees C to 35 degrees C. The results indicate an increased supramolecular structural stability in the presence of glycinebetaine.
Keywords:D1/D2/Cytb559 complex   glycinebetaine   heat stress   photoinactivation
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