Abstract:
A polyclonal antibody prepared cyclodextrin glycosyltransferase (CGTase) was purified from rabbit antiserum by ammonium sulfate precipitation with a 45% saturation and DEAE-cellulose ion exchange chromatography. Fractions were tested for the presence and purity of IgG by SDS-polyacrylamide gel electrophoresis. The result demonstrated that antibody against CGTase of high purity was obtained by the described purification method and the antibody titer was determined to be 1:2 8 by ouchterlony immunodiffusion. The purified antibody was linked to CNBr-activated Sepharose 4 B and used for immunoaffinity purification of CGTase. The bound enzyme was eluted with 3.5 M sodium thiocyanate in 50 mM ammonium hydroxide, pH 10.5, at a flow rate 0.1 millilitre/minute at room temperature. The specific activity of the purfied CGTase was increased 155 folds and about 45% of the total activity was recovered. The prepared enzyme was separated into two bands after non denaturing-polycrylamide gel electrophoresis, but showed only a single band in SDS-polyacrylamide gel electrophoresis. The molecular weight of the protein band was estimated to be 72,000 dalton.