Crystallization and preliminary X-ray studies of metallothionein II from rabbit liver

Metallothionein II (M_w = 6.8 kDa), induced by cadmium and purified from rabbit liver, has been crystallized in space group P6₂22 or P6₄22. The unit-cell parameters were a = b = 113.4, c = 219.1 Å, α = β = 90.0, γ = 120.0° when crystallized from sodium citrate buffer and a = b = 113.4, c = 219.6 Å, α = β = 90.0, γ = 120.0° when crystallized from Tris–HCl buffer. There are 12 molecules per asymmetric unit and the solvent content is about 57%.