Diphosphoinositol polyphosphate phosphohydrolase DDP1

UniProtKB accession:  Q99321

Grouped By:  Matching UniProtKB accession

UniProtKB description:  May eliminate potentially toxic dinucleoside polyphosphates during sporulation. Most active against diadenosine 5',5'''-P1,P6-hexaphosphate (Ap6A). Can also hydrolyze diadenosine 5',5'''-P1,P5-pentaphosphate (Ap5A), adenosine 5'-pentaphosphate (p5A), and adenosine 5'-tetraphosphate (p4A) are also substrates, but not diadenosine 5',5'''-P1,P4-tetraphosphate (Ap4A) or other dinucleotides, mononucleotides, nucleotide sugars, or nucleotide alcohols. Also cleaves a beta-phosphate from the diphosphate groups in PP-InsP5 (diphosphoinositol pentakisphosphate) and [PP]2-InsP4 (bisdiphosphoinositol tetrakisphosphate) (PubMed:10085096, PubMed:10419486). Also has endopolyphosphatase activity (PubMed:31175919).