Probable calcium-binding peroxygenase. May be involved in pollination. RH + ROOH = ROH + ROH. Binds 1 heme b (iron(II)-protoporphyrin IX) group. Homodimer. Expressed in pollen coat. Transmembrane regions are predicted by sequence analysis tools, but these regions probably constitute hydrophobic domains associated to phospholipids. The proline-knot motif (81-90) may be involved in targeting to lipid bodies. Belongs to the caleosin family.