AZUP_PARPN pazS Pseudoazurin MFHHSLAAAAAALLALAAPGFAATHEVHMLNKGESGAMVFEPAFVRAEPGDVINFVPTDKSHNVEAIKEILPEGVESFKSKINESYTLTVTEPGLYGVKCTPHFGMGMVGLVQVGDAPENLDAAKTAKMPKKARERMDAELAQVN 145 This soluble electron transfer copper protein is required for the inactivation of copper-containing nitrite reductase in the presence of oxygen.