Abstract
A ferredoxin from the thermophilic archaebacterium, Thermoplasma acidophilum, is supposed to contain two (4Fe-4S) active centers; one center could be linked by four cysteine residues to the protein and the other bonded with three cysteines and an unknown group. This ferredoxin has been crystallized by salting-out against 2.3 m-ammonium sulfate solution. The space group is P2 12 12 with cell dimensions of a = 59.20 A ̊ , b = 52.77 A ̊ and c = 41.28 A ̊ . Four molecules pack in the unit cell with V m = 2.03 A ̊ 3/dalton .
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