The vanadium-dependent haloperoxidase from the seaweed Corallina officinalis has been purified to homogeneity and crystallised. The protein is reported to be a hexamer of 12 × 64,000 Da, contains no haem, and is dependent on vanadium for activity. The crystals are grown from polyethylene glycol (PEG) 6,000 and 0.4 M potassium chloride. They are stable and diffract to better than 2 Å resolution. They are of a cubic space group I23 (or I2,3) with cell dimensions 00055-E/asset/equation/feb2001457939500055e-math-si1.gif?v=1&s=2406c8ccca9fce35a2c620832a267d3b3cadc7d6)
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