Purification and characterisation of intracellular alpha-galactosidases from Acinetobacter sp.

E, Sirisha; Potumarthi, Ravichandra; A, Naveen; Mangamoori, Lakshmi

Two alpha-galactosidases (Ag-I & Ag-II) were purified from Acinetobacter sp. Both the enzymes were monomeric with pH optima of 7.0 and molecular weight of 65 kDa for Ag-I and 37 kDa for Ag-II. The temperature optima for Ag-I was between 50 and 60 °C and that of Ag-II was 40 °C. Both the enzymes were strongly inhibited by metal ions Ag and Hg, pCMB and SDS (1 %). The enzymes were found to be active on both natural and synthetic substrates. Artificial substrate, pNPGal, has shown more affinity to enzyme than natural substrate raffinose. The half-life ( t) of Ag-I varied from 1.85 h at 90 °C to 7.6 h at 70 °C.

3 Biotech, 2015, Vol 5, Issue 6, p925

2190-572X

Academic Journal

10.1007/s13205-015-0290-9