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Title

The transient complex of poplar plastocyanin with cytochrome f: effects of ionic strength and pH

AuthorsLange, Christian; Cornvik, Tobias; Díaz-Moreno, Irene ; Ubbink, Marcellus
KeywordsElectron transfer
Photosynthesis
Protein complex
NMR spectroscopy
Transient complex
Issue DateApr-2005
PublisherElsevier
CitationBiochimica et Biophysica Acta - Bioenergetics 1707(2-3): 179-188 (2005)
AbstractThe orientation of poplar plastocyanin in the complex with turnip cytochrome f has been determined by rigid-body calculations using restraints from paramagnetic NMR measurements. The results show that poplar plastocyanin interacts with cytochrome f with the hydrophobic patch of plastocyanin close to the heme region on cytochrome f and via electrostatic interactions between the charged patches on both proteins. Plastocyanin is tilted relative to the orientation reported for spinach plastocyanin, resulting in a longer distance between iron and copper (13.9 A). With increasing ionic strength, from 0.01 to 0.11 M, all observed chemical-shift changes decrease uniformly, supporting the idea that electrostatic forces contribute to complex formation. There is no indication for a rearrangement of the transient complex in this ionic strength range, contrary to what had been proposed earlier on the basis of kinetic data. By decreasing the pH from pH 7.7 to pH 5.5, the complex is destabilized. This may be attributed to the protonation of the conserved acidic patches or the copper ligand His87 in poplar plastocyanin, which are shown to have similar pK(a) values. The results are interpreted in a two-step model for complex formation.
Description10 páginas, 7 figuras
Publisher version (URL)http://dx.doi.org/10.1016/j.bbabio.2004.12.002
URIhttp://hdl.handle.net/10261/33647
DOI10.1016/j.bbabio.2004.1.002
ISSN0005-2728
Appears in Collections:(IBVF) Artículos
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