The steady-state levels of PIs in Sac2 KO MEFs, as measured by HPLC of metabolically labeled cells, demonstrated only a very minor (∼5%, and at the limit of significance) increase in PI4P (PI4P levels expressed as the percentage of total detectable PIs in wild-type (WT) control and KO MEFs were 0.058 ± 0.0010 and 0.061 ± 0.0012 [P < 0.375], respectively).
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Sac2/INPP5F is an inositol 4-phosphatase that functions in the endocytic pathway.
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