期刊
BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS
卷 1787, 期 3, 页码 144-154出版社
ELSEVIER
DOI: 10.1016/j.bbabio.2008.12.006
关键词
Ferredoxin-NADP(+) reductase; Flavodoxin; Protein-protein interaction; Electron transfer; Photosystem; Transient interaction
资金
- Spanish Ministry of Education and Science [BIO2007-65890-C02-01]
- DGA [PM062/2007]
Under iron-deficient conditions Flavodoxin (Fld) replaces Ferredoxin in Anabaena as electron carrier from Photosystem I (PSI) to Ferredoxin-NADP(+) reductase (FNR). Several residues modulate the Fld interaction with FNR and PSI, but no one appears as specifically critical for efficient electron transfer (ET). Fld shows a strong dipole moment, with its negative end directed towards the flavin ring. The role of this dipole moment in the processes of interaction and ET with positively charged surfaces exhibited by PSI and FNR has been analysed by introducing single and multiple charge reversal mutations on the Fld surface. Our data confirm that in this system interactions do not rely on a precise complementary surface of the reacting molecules. In fact, they indicate that the initial orientation driven by the alignment of dipole moment of the Fld molecule with that of the partner contributes to the formation of a bunch of alternative binding modes competent for the efficient ET reaction. Additionally, the fact that Fld uses different interaction surfaces to dock to PSI and to FNR is confirmed. (C) 2008 Elsevier B.V. All rights reserved.
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