catalytic activity:Myo-inositol hexakisphosphate + H(2)O = myo-inositol pentakisphosphate (mixed isomers) + phosphate.,disease:Defects in MINPP1 may be involved in follicular thyroid tumors development.,function:Acts as a phosphoinositide 5- and phosphoinositide 6-phosphatase and regulates cellular levels of inositol pentakisphosphate (InsP5) and inositol hexakisphosphate (InsP6) (By similarity). May play a role in bone development (endochondral ossification).,tissue specificity:Widely expressed with highest levels in kidney, liver and placenta.,
Endoplasmic reticulum lumen .
Widely expressed with highest levels in kidney, liver and placenta.