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Interaction of erogenous quinones with photosystem II in inside‐out thylakoids
Author(s) -
Delrieu Marie-José,
Rosengard Françoise
Publication year - 1989
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(89)81447-4
Subject(s) - photosystem ii , thylakoid , fluorescence , chemistry , electron transfer , photochemistry , yield (engineering) , dcmu , flash (photography) , quantum yield , chlorophyll fluorescence , photosynthesis , chloroplast , biochemistry , materials science , physics , optics , metallurgy , gene
The presence of erogenous quinones PPBQ, DCBQ and DMQ in inside‐out thylakoids alters the oscillation pattern with period 4 of the flash‐induced fluorescence yield. The results can be interpreted by assuming that at ambient temperature PPBQ replaces PQ in 100% of the PS II centers detected by fluorescence, DMQ and DCBQ being bound to 40–60% of these centers only. The evaluation of the percentage of double hits in a 3 μs flash allows estimation of the electron‐transfer rate from Q ‐ A to Fe 3+ , which varies from 9 μs (PPBQ) to 20μs (DMQ).