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Kinetics of the plastoquinone pool oxidation following illumination
Author(s) -
Ivanov Boris,
Mubarakshina Maria,
Khorobrykh Sergey
Publication year - 2007
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/j.febslet.2007.02.044
Subject(s) - plastoquinone , oxygen , chemistry , thylakoid , kinetics , photochemistry , superoxide , anaerobic exercise , phase (matter) , membrane , biophysics , biochemistry , chloroplast , biology , organic chemistry , physiology , physics , quantum mechanics , gene , enzyme
The oxidation of the PQ‐pool after illumination with 50 or 500 μmol quanta m −2 s −1 was measured in isolated thylakoids as the increase in Δ A 263 , i.e., as the appearance of PQ. While it was not observed under anaerobic conditions, under aerobic conditions it was biphasic. The first faster phase constituted 26% or 44% of total reappearance of PQ, after weak or strong light respectively. The dependence on oxygen presence as well as the correlation with the rate of oxygen consumption led to conclusion that this phase represents the appearance of PQ from PQ ▪− produced in the course of PQH 2 oxidation by superoxide accumulated in the light within the membrane.