The apparent molecular weight of g6pd , determined by gel filtration , was 220kd ; the subunit molecular weight was 50 . 5kd as determined by sds - page , suggesting that the native enzyme was a tetramer consisting of four identical subunits 凝膠過濾法測定該酶表觀分子量約為220kd , sds - page測定亞基分子量約為50 . 5kd ,可見該酶是由四個相同亞基構(gòu)成的四聚體。