Crystallization and preliminary X-ray diffraction analysis of two pH-dependent forms of a di-haem cytochrome c peroxidase from Pseudomonas nautica

Cytochrome c peroxidase from P. nautica has been crystallized in two different space groups at pH 4.0 and pH 5.3 using sodium citrate and ammonium phosphate as precipitants. Data collection under cryogenic conditions allowed the characterization of the two crystal forms.