Nucleoside-triphosphate pyrophosphatase Pyrophosphatase that hydrolyzes non-canonical purine nucleotides such as XTP and ITP to their respective monophosphate derivatives. Probably excludes non-canonical purines from DNA precursor pool, thus preventing their incorporation into DNA and avoiding chromosomal lesions. Non-standard purine NTP pyrophosphatase MKIYFATGNPNKIKEANIILKDLKDVEIEQIKISYPEIQGTLEEVAEFGAKWVYNILKKPVIVEDSGFFVEALNGFPGTYSKFVQETIGNEGILKLLEGKDNRNAYFKTVIGYCDENGVRLFKGIVKGRVSEEIRSKGYGFAYDSIFIPEEEERTFAEMTTEEKSQISHRKKAFEEFKKFLLDRI 185 NTPA_METJA Nucleoside-triphosphate diphosphatase Non-canonical purine NTP pyrophosphatase MJ0226 MJ0226