Flash‐induced absorption changes in photosystem I at low temperature: evidence that the electron acceptor A1is vitamin K1
- 28 July 1986
- journal article
- Published by Wiley in FEBS Letters
- Vol. 203 (2) , 220-224
- https://doi.org/10.1016/0014-5793(86)80746-3
Abstract
Low temperature flash absorption spectroscopy has been applied to elucidate the chemical nature of the secondary electron acceptor A1of photosystem I (PS‐I). The flash‐induced absorption changes measured in digitonin‐fractionated spinach PS‐I particles at 10 K between 240 and 525 nm are shown to comprise a major decay phase witht~ 150 μs which has been attributed to the recombination reaction P‐700+·A1→ P‐700·A1[(1984) Biochim. Biophys. Acta 767, 404‐414]. We present the absorption difference spectrum of this reaction and demonstrate that it contains contributions in the ultraviolet due to A1, which are characteristic of vitamin K1(phylloquinone).Keywords
This publication has 16 references indexed in Scilit:
- Phylloquinone copurifies with the large subunit of photosystem IFEBS Letters, 1986
- Optical difference spectrum of the electron acceptor Aoin photosystem IFEBS Letters, 1985
- Multiple forms of P700-chlorophyll a-protein complexes from Synechococcus sp.: The iron, quinone and carotenoid contentsPhotosynthesis Research, 1985
- Primary photochemistry in photosystem-IPhotosynthesis Research, 1985
- Photosystem I photochemistry at low temperature. Heterogeneity in pathways for electron transfer to the secondary acceptors and for recombination processesBiochimica et Biophysica Acta (BBA) - Bioenergetics, 1984
- Orientation dependence of radical pair interactions in spinach chloroplastsBiochimica et Biophysica Acta (BBA) - Bioenergetics, 1983
- Evidence for a new early acceptor in Photosystem I of plants. An ESR investigation of reaction center triplet yield and of the reduced intermediary acceptorsBiochimica et Biophysica Acta (BBA) - Bioenergetics, 1983
- Identification of multiple components in the intermediary electron carrier complex of photosystem IFEBS Letters, 1982
- RAPID REDUCTION OF P‐700 PHOTOOXIDIZED BY A FLASH AT LOW TEMPERATURE IN SPINACH CHLOROPLASTSPhotochemistry and Photobiology, 1979
- Fractionation of the photochemical systems of photosynthesis I. Chlorophyll contents and photochemical activities of particles isolated from spinach chloroplastsBiochimica et Biophysica Acta (BBA) - Biophysics including Photosynthesis, 1966