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Photosystem I monomers from wildtype cells of Synechocystis PCC 6803 and from a mu­ tant deficient in the psaL gene were crystallized. PsaL encodes for the hydrophobic subunit L, which has been proposed to constitute the trimerization domain in the PS I trimer. The absence of subunit L facilitated crystallization of the PS I monomer. The unit cell dimensions and the space group for the crystals from this preparation could be determined to be a = b = 132 Å , c -525 Å, α = β = 90°, y = 120°, the space group is P6 1  or P6 5 . The results show the potential of using specifically designed deletion mutants of an integral membrane protein for the systematic improvement of crystal structure data.

Crystallization of Intact and Subunit L-Deficient Monomers from Synechocystis PCC 6803 Photosystem I