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A specific 1-phosphatase acting on myo-inositol (1,4)-biphosphate with a high affinity (Km = 0.9 microM) has been purified 49-fold from soluble proteins of rat liver by anion exchange chromatography followed by gel filtration. This enzyme has a molecular weight of 58,000 as estimated by gel filtration, a pH optimum of 7.5, and requires Mg++ for activity. The only product formed from myo-inositol (1,4)-bisphosphate is the 4-monophosphate. Of 7 other inositol phosphates examined only myo-inositol (1,3,4)-triphosphate was a substrate.
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