Crystallographic characterization of tetanus toxin fragment C

The C-terminal fragment from tetanus toxin has been crystallized. The 50 kDa protein forms prismatic crystals with an orthorhombic unit cell of dimensions a = 64.03 A, b = 76.31 A and c = 135.3 A. The space group is P2(1)2(1)2(1). Assuming one molecule per asymmetric unit, the solvent occupies 63% of the unit cell.