InterPro domain: IPR004861

This group of atypical dual-specificity phosphatases are predominantly from fungi, plants and bacteria. This entry includes budding yeast Siw14 (also known as Oca3) and related proteins. Siw14 is a inositol pyrophosphate phosphatase that modulates inositol pyrophosphate metabolism by dephosphorylating the IP7isoform 5PP-IP5to IP6 [ 1 ]. This entry also includes budding yeast Oca1/2/4/6 and Arabidopsis DSP1/2/3/4/5. All DSPs tested (AtPFA-DSP1, -2, -3, and -5) displayed phosphatase activity toward PI(3,5)P2, with AtPFA-DSP2 showing a higher activity [ 2 ]. Oca1/2/4/6 are putative phosphatases associated with the caffeine-sensitivity stress pathway in S. cerevisiae [ 3 ].

1. A Novel Inositol Pyrophosphate Phosphatase in Saccharomyces cerevisiae: Siw14 PROTEIN SELECTIVELY CLEAVES THE β-PHOSPHATE FROM 5-DIPHOSPHOINOSITOL PENTAKISPHOSPHATE (5PP-IP5). null 291, 6772-83
2. Phylogenetic and genetic linkage between novel atypical dual-specificity phosphatases from non-metazoan organisms. null 285, 341-54