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Reduced content of the quinone acceptor Q A in photosystem II complexes isolated from thylakoid membranes after prolonged photoinhibition under anaerobic conditions
Author(s) -
Koivuniemi Antti,
Swiezewska Ewa,
Aro Eva-Mari,
Styling Stenbjörn,
Andersson Bertil
Publication year - 1993
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 - 10.1016/0014-5793(93)81017-t
Subject(s) - plastoquinone , photosystem ii , thylakoid , photoinhibition , chemistry , photosystem i , photochemistry , photosystem , spinach , photosynthesis , membrane , protonation , dcmu , biophysics , biochemistry , biology , chloroplast , organic chemistry , gene , ion
The plastoquinone content of photosystem II complexes isolated from spinach photosystem II‐enriched membranes subjected to strong photoinhibitory illumination under anaerobic conditions was determined by HPLC. A pronounced decrease of the plastoquinone content was found in the photoinactivated complexes. These results corroborate earlier models in which photoinhibitory illumination is suggested to eventually lead to release of doubly reduced and protonated Q A from its site on the D2‐protein.