3.2.1.24 additional information - alpha-D-mannosidase exists in multiple forms and can be classified on the basis of their optimum pH, into three groups 681902 3.2.1.24 3.4 - - 135995 3.2.1.24 3.5 - - 135960, 135970 3.2.1.24 3.5 4 isoform alpha-mannosidase I 730990 3.2.1.24 4 - - 135980, 136025 3.2.1.24 4 - alpha-mannosidase A 135999 3.2.1.24 4 4.5 - 135988 3.2.1.24 4 4.5 enzyme from lysosomal fraction 656592 3.2.1.24 4 4.5 lysosomal or acid mannosidases. Neutral optimum pH for endoplasmic reticulum-associated mannosidases 681902 3.2.1.24 4 5 - 136026