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The effect of the myo-inositol 1,4,5-trisphosphate (IP3) analogue, myo-inositol 1,4,5-trisphosphorothioate (IPS3) on the dephosphorylation of D-5-[32P]IP3 by the 5-phosphatase from human erythrocyte membranes has been investigated. DL-IPS3 was found to act as a competitive inhibitor with a Ki of 6 microM, making it the most potent inhibitor currently available for this enzyme. L-IP3 inhibited the enzyme with a Ki of 124 microM and was more potent than D-2,3-diphosphoglycerate (Ki 978 microM).
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Cooke et al. (1989) studied this question.
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