Inositol polyphosphate-4-phosphatase, type II, 105kDa is a

protein Proteins are large biomolecules and macromolecules that comprise one or more long chains of amino acid residues. Proteins perform a vast array of functions within organisms, including catalysing metabolic reactions, DNA replication, res ...

that in humans is encoded by the INPP4B

gene In biology, the word gene (from , ; "...Wilhelm Johannsen coined the word gene to describe the Mendelian units of heredity..." meaning ''generation'' or ''birth'' or ''gender'') can have several different meanings. The Mendelian gene is a b ...

. INPP4B encodes the inositol polyphosphate 4-phosphatase type II, a dual specificity phosphatase. INPP4B is involved in

phosphatidylinositol Phosphatidylinositol (or Inositol Phospholipid) consists of a family of lipids as illustrated on the right, where red is x, blue is y, and black is z, in the context of independent variation, a class of the phosphatidylglycerides. In such molecul ...

signaling pathways. This enzyme removes the

phosphate In chemistry, a phosphate is an anion, salt, functional group or ester derived from a phosphoric acid. It most commonly means orthophosphate, a derivative of orthophosphoric acid . The phosphate or orthophosphate ion is derived from phosph ...

group at position 4 of the inositol ring from inositol 3,4-bisphosphate and phosphate groups from phosphotyrosines. There is limited data to suggest that the human type II enzyme is subject to alternative splicing, as has been established for the type I enzyme.

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Further reading