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Plastocyanin: Structural and functional analysis

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Abstract

Plastocyanin is one of the best characterized of the photosynthetic electron transfer proteins. Since the determination of the structure of poplar plastocyanin in 1978, the structure of algal (Scenedesmus, Enteromorpha, Chlamydomonas) and plant (French bean) plastocyanins has been determined either by crystallographic or NMR methods, and the poplar structure has been refined to 1.33 Å resolution. Despite the sequence divergence among plastocyanins of algae and vascular plants (e.g., 62% sequence identity between theChlamydomonas and poplar proteins), the three-dimensional structures are remarkably conserved (e.g., 0.76 Å rms deviation in the Cα positions between theChlamydomonas and poplar proteins). Structural features include a distorted tetrahedral copper binding site at one end of an eight-stranded antiparallel β-barrel, a pronounced negative patch, and a flat hydrophobic surface. The copper site is optimized for its electron transfer function, and the negative and hydrophobic patches are proposed to be involved in recognition of physiological reaction partners. Chemical modification, cross-linking, and site-directed mutagenesis experiments have confirmed the importance of the negative and hydrophobic patches in binding interactions with cytochromef and Photosystem I, and validated the model of two functionally significant electron transfer paths in plastocyanin. One putative electron transfer path is relatively short (∼4 Å) and involves the solvent-exposed copper ligand His-87 in the hydrophobic patch, while the other is more lengthy (∼12–15 Å) and involves the nearly conserved residue Tyr-83 in the negative patch.

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  1. Department of Chemistry and Biochemistry and Molecular Biology Institute, University of California, 90024, Los Angeles, California

    Matthew R. Redinbo, Todd O. Yeates & Sabeeha Merchant

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Redinbo, M.R., Yeates, T.O. & Merchant, S. Plastocyanin: Structural and functional analysis. J Bioenerg Biomembr 26, 49–66 (1994). https://doi.org/10.1007/BF00763219

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