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J. Biol. Chem., Vol. 265, Issue 11, 5946-5949, 04, 1990

Cloning and expression of bovine brain inositol monophosphatase

RE Diehl, P Whiting, J Potter, N Gee, CI Ragan, D Linemeyer, R Schoepfer, C Bennett and RA Dixon
Department of Molecular Biology, Sharp & Dohme Research Laboratories, West Point, Pennsylvania 19486.

Inositol monophosphatase is a key enzyme of the inositol phosphate second messenger signaling pathway. It is responsible for the provision of inositol required for synthesis of phosphatidylinositol and polyphosphoinositides and has been implicated as the pharmacological target for lithium action in brain. Using oligonucleotide probes based on partial amino acid sequence data for the bovine brain enzyme, several overlapping cDNA clones of 2-3 kilobases in length have been isolated. All contain an open reading frame encoding a 277-amino acid protein. No significant sequence homology was found with any known protein. The open reading frame was inserted into a bacterial expression vector in order to confirm the presumed identity of the protein. The expressed protein reacted with an anti-inositol monophosphatase monoclonal antibody. In addition, the protein was enzymically active and indistinguishable from the bovine brain enzyme with respect to Km values for substrate and Li+ sensitivity of inositol 1-phosphate hydrolysis.
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