Purification and crystallization of Photosystem I complex from a 
phycobilisome-less mutant of the cyanobacterium Synechococcus PCC 7002

Tsiotis, Georgios; Nitschke, W.; Haase, Winfried; Michel, Hartmut

doi:10.1007/BF00016559

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Purification and crystallization of Photosystem I complex from a phycobilisome-less mutant of the cyanobacterium Synechococcus PCC 7002

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Tsiotis, Georgios
Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Haase, Winfried
Department of Physiology, Max Planck Institute of Biophysics, Max Planck Society;

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Michel, Hartmut
Department of Molecular Membrane Biology, Max Planck Institute of Biophysics, Max Planck Society;

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Citation

Tsiotis, G., Nitschke, W., Haase, W., & Michel, H. (1993). Purification and crystallization of Photosystem I complex from a phycobilisome-less mutant of the cyanobacterium Synechococcus PCC 7002. Photosynthesis Research, 35(3), 285-297. doi:10.1007/BF00016559.

Cite as: https://hdl.handle.net/21.11116/0000-0007-098B-3

Abstract

An active photosystem (PSI) complex was isolated from a phycobilisome-less mutant of the mesophilic cyanobacterium Synechococcus PCC 7002 by a mild procedure. Purification of PS I was achieved using a sucrose density gradient and an isoelectric focussing subsequent to the extraction of PSI from thylakoids with dodecyl-β-maltoside. Electron microscopy and gel filtration HPLC suggested that the isolated complex represents a trimeric form of PSI. The trimeric form was resistant to pH or detergent exchange. A ‘molecular weight’ of 690 kDa to 760 kDa has been determined for the complex by gel filtration HPLC in several detergents or mixtures of detergents.

The PSI complex contains the polypeptides of the psaA, psaB, psaC, psaD, psaE, psaL gene products and two small polypeptides as determined by SDS-PAGE and N-terminal sequencing; its antenna size is 77±2 Chl a/P₇₀₀. The full set of Fe-S clusters (F_A, F_B and F_X) was observed by EPR-spectroscopy. A preliminary characterization of crystals obtained from this preparation was carried out using SDS-PAGE, optical and EPR spectroscopy.