3(1)-hydroxy-L-isoleucine + 2-oxoglutarate + O2 = (4S)-3(1),4-dihydroxy-L-isoleucine + succinate + CO2
3(1)-hydroxy-l-isoleucine + 2-oxoglutarate + o2 = (4s)-3(1),4-dihydroxy-l-isoleucine + succinate + co2