Purification and Characterization of α-Mannosidase from Moss Hyophilla nymaniana (Fleish.) Menzel
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α-Mannosidase EC: (126.96.36.199) is the major post-translational modifications enzyme which catalyzes the cleavage of the alpha form of mannose. Lysosomal α-mannosidase assists in the processing of complex sugars from glycoproteins. Defective or deficient α-mannosidase activity causes α-mannosidosis and leads to deterioration of the central nervous system in children. In the present study, plant α-mannosidase was purified 39-fold in a stepwise manner by ammonium sulfate precipitation, dialysis, gel filtration chromatography and DEAE ion exchange chromatography. The purified mannosidase was a heterodimer consisting of approximately 72 and 50 kDa molecular mass subunits under reducing conditions. Optimum pH and temperature reported for mannosidase activity were 4.5 and 40 °C respectively. Among the various metal ions tested for the assessment of the enzyme activity, 2 mM Zn2+ strongly activated the enzyme while Hg2+and Ag2+ caused enzyme inhibition at the same concentration. The Km and Vmax values calculated from Lineweaver plot against the substrate p-nitrophenyl α-mannopyranoside were 5.4 mM and 8.4 U/ml, respectively. To the author’s knowledge, the data presented here is the first report on purification and characterization of α-mannosidase from the moss H. nymaniana.
Keywordsα-Mannosidase Gel filtration chromatography Hyophilla nymaniana (Fleish.) Menzel Ion exchange chromatography
The authors deeply acknowledge the support got from the Government from UGC Project F. No. 37-116/2009 (SR). They are also thankful to Birla Institute of Technology, Department of Bioengineering and Centre of Excellence (COE) TEQUIP II for providing R&D facilities.
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Conflict of interest
The authors declare that there is no financial or commercial conflict of interest to publish this manuscript.
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