Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10869893 | FEBS Letters | 2015 | 6 Pages |
Abstract
Electron transfer processes in cyanobacterial photosystem I particles from Synechocystis sp. PCC 6803 with a high potential naphthoquinone (2,3-dichloro-1,4-naphthoquinone) incorporated into the A1 binding site have been studied at 298 and 77Â K using time-resolved visible and infrared difference spectroscopy. The high potential naphthoquinone inhibits electron transfer past A1, and biphasic P700+A1â radical pair recombination is observed. The two phases are assigned to P700+A1Bâ and P700+A1Aâ recombination. Analyses of the transient absorption changes indicate that the ratio of A- and B-branch electron transfer is 95:5 at 77 K and 77:23 at 298Â K.
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Authors
Hiroki Makita, Gary Hastings,