Abstract
A membrane protein complex, photosynthetic reaction center purified from the thermophilic purple sulfur bacterium, Chromatium tepidum has been crystallized from a phosphate butter containing a detergent, n-octyl-β- D-glucopyranoside and a precipitant, polyethylene glycol 4000. The crystals diffracted X-rays beyond 3Å resolution with synchrotron radiation and are suitable for high-resolution X-ray crystallographic studies. The crystals belong to the orthorhombic space group P2 12 12 1 with unit-cell dimensions of a = 136Å, b = 197Å, and c = 82Å. Assuming that they contain one reaction center complex in the asymmetric unit, V M was calculated to be 4.3 Å 3/Da, which agrees with the values obtained in the membrane protein complexes.
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