Electron transfer reactions in photosystem I following vitamin K1 depletion by ultraviolet irradiation
- 3 July 1989
- journal article
- Published by Wiley in FEBS Letters
- Vol. 250 (2) , 271-274
- https://doi.org/10.1016/0014-5793(89)80736-7
Abstract
Photosystem I preparations were irradiated with UV to destroy vitamin K1 in situ. The depletion of vitamin K1 resulted in inactivation of NADP+ photoreduction and introduction of a approximately 220 ms component in the flash generated P700+ rereduction at room temperature. The photoreduction of the terminal FeS centers FA and FB in control and vitamin K1-depleted preparations at 7 K were comparable. The data confirm that vitamin K1 is functionally implicated in primary electron transfer reactions in PS I at physiological temperature, and that the anomalous results at cryogenic temperature may be explicable in terms of a by-pass of the vitamin K1 acceptor site or heterogeneity introduced into the photosystem by quinone removal.Keywords
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