at ase , ▁ ▁L - my o - inos it ol - 1 - ph osph ate ▁ph osph at ase , ▁ ▁my o - inos it ol ▁ 1 - ph osph at ase , ▁ ▁in os it ol ▁ph osph at ase , ▁ ▁in os it ol ▁mon oph osph ate ▁ph osph at ase , ▁ ▁in os it ol - 1 ( or ▁ 4 )- mon oph osph at ase , ▁ ▁my o - inos it ol - 1 ( or ▁ 4 )- ph osph ate ▁ph osph oh yd rol ase , ▁ ▁my o - inos it ol ▁mon oph osph at ase , ▁and ▁ ▁my o - inos it ol - 1 - ph osph at ase . ▁ ▁Str ucture ▁▁ ▁The ▁en zym e ▁is ▁a ▁dim er ▁compr ising ▁ 2 7 7 ▁am ino ▁acid ▁resid ues ▁per ▁sub unit . ▁Each ▁dim er ▁exists ▁in ▁ 5 ▁layers ▁of ▁altern ating ▁α - hel ices ▁and ▁ β - sheets , ▁total ing ▁to ▁ 9 ▁α - hel ices ▁and ▁ β - sheets ▁per ▁sub unit . ▁I MP ase ▁has ▁three ▁hydro ph il ic ▁h ollow ▁active ▁sites , ▁each ▁of ▁which ▁bind ▁water ▁and ▁mag nes ium ▁mole cules . ▁These ▁binding ▁sites ▁appear ▁to ▁be ▁conser ved ▁in ▁other ▁ph osph odi ester ases ▁such ▁as ▁f ruct ose ▁ 1 , 6 - bis ph osph