Inositol phosphatase SIW14

UniProtKB accession:  P53965

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UniProtKB description:  Selectively cleaves the beta-phosphate at the 5-position of soluble inositol pyrophosphates. Converts 5-diphosphoinositol tetrakisphosphate (5-PP-InsP(4)) into inositol pentakisphosphate (InsP(5)), 5-diphosphoinositol pentakisphosphate (5-PP-IP(5) or 5-InsP(7)) into inositol hexakisphosphate (IP(6) or InsP(6)), and 1,5-bisdiphosphoinositol tetrakisphosphate (1,5-PP-IP(5) or InsP(8)) into 1-diphosphoinositol pentakisphosphate (1-PP-IP(5) or 1-InsP(7)) (PubMed:26828065, PubMed:29540476). Modulates inositol pyrophosphate metabolism that may have an influence in stress response (PubMed:26828065). Plays a role in actin filament organization and endocytosis (PubMed:15020461). Functions as a prion suppressing factor possibly due to its phosphatase activity against inositol pyrophosphates, which are signal transduction molecules involved in prion propagation (PubMed:28923943).