Abstract
PSI complexes were isolated from the thermophilic cyanobacterium, Synechococcus vulcanus, by mild detergent treatment of the thylakoid membranes, purified by sucrose-density gradient centrifugation, and then crystallized. High resolution SDS-PAGE revealed the presence of the product of the psal gene in S. vulcanus PSI complexes and crystals. Crystals of the PSI complexes retained all of the components of electron carriers and subunit polypeptides (including PsaX) known in cyanobacteria .
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