Pyrophosphatase that hydrolyzes the non-canonical purine nucleotides inosine triphosphate (ITP), deoxyinosine triphosphate (dITP) as well as 2'-deoxy-N-6-hydroxylaminopurine triposphate (dHAPTP) and xanthosine 5'-triphosphate (XTP) to their respective monophosphate derivatives. The enzyme does not distinguish between the deoxy- and ribose forms. Probably excludes non-canonical purines from RNA and DNA precursor pools, thus preventing their incorporation into RNA and DNA and avoiding chromosomal lesions (By similarity). Nucleoside-triphosphate pyrophosphatase 198 ITPA_RAT Inosine triphosphate pyrophosphatase Non-canonical purine NTP pyrophosphatase Nucleoside-triphosphate diphosphatase Non-standard purine NTP pyrophosphatase Itpa MAASLVGKKIVFVTGNAKKLEEVIQILGDKFPCTLVAQKIDLPEYQGEPDEISIQKCQEAARQVQGPVLVEDTCLCFNALGGLPGPYIKWFLQKLKPEGLYQLLAGFEDKSAYALCTFALSTGDPSQPVLLFRGKTPGQIVMPRGSRDFGWDPCFQPDGYEQTYAEMPKAEKNTISHRFRALFKLQEYFGVTDGAGDH