Abstract
Improved crystallization methods led to the growth of large single crystals of the photosystem I reaction centre isolated from the thermophilic cyanobacterium Phormidium laminosum. Although the crystals exhibited a high degree of mosaicity, some preliminary X-ray diffraction studies were performed. The highest order reflections found correspond to interplanar spacings of approx. 0.8 nm. In conjunction with electron microscopy of thin three-dimensional crystals, a triclinic or monoclinic crystal system with unit cell dimensions 30 × 18 × 18 nm was assigned. In addition, our data suggest the presence of four trimeric complexes per unit cell, which may be organised as two face-to-face pairs.
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