| Autor: |
Mamedova, Aygun A., Mamedov, Mahir D., Gourovskaya, Kira N., Vassiliev, Ilya R., Golbeck, John H., Semenov, Alexey Yu. |
| Zdroj: |
FEBS Letters; January 1999, Vol. 462 Issue: 3 p421-424, 4p |
| Abstrakt: |
An electrometrical technique was used to investigate electron transfer between the terminal iron–sulfur centers F A/F Band external electron acceptors in photosystem I (PS I) complexes from the cyanobacterium Synechococcussp. PCC 6301 and from spinach. The increase of the relative contribution of the slow components of the membrane potential decay kinetics in the presence of both native (ferredoxin, flavodoxin) and artificial (methyl viologen) electron acceptors indicate the effective interaction between the terminal [4Fe–4S] cluster and acceptors. The finding that F Afails to donate electrons to flavodoxin in F B-less (HgCl 2-treated) PS I complexes suggests that F Bis the direct electron donor to flavodoxin. The lack of additional electrogenicity under conditions of effective electron transfer from the F Bredox center to soluble acceptors indicates that this reaction is electrically silent. |
| Databáze: |
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