Heat-induced changes in the EPR signal of tyrosine D ( Y^{{OX}}_{D} ): a possible role of Cytochrome b559

摘要: The present study for the first time describes a close relationship between change in states of Cyt b559, damage to Mn complex and rapid reduction tyrosine D (YD) as function temperature spinach thylakoid membranes. Measurements EPR signal dark stable heat-treated membranes showed gradual decay oxidized state with progression temperature. Simultaneously, it leads conversion high-potential Cytochrome b559 into its low-potential form. We have speculated possible involvement primary events at high However, may also be due disassembly clock, which causes exposure YD lumen thereby by some unknown factor. These conclusions are supported measurements Mn2+ release thermoluminescence curves various charge pairs results reveal an important aspect on role PS II during stress.