Streptococcus pneumoniae was cloned and expressed in E.coli Er2566. The recombinant RpiB was purified by HisTrap HP chromatography. The enzyme exhibited maximal activity at pH 7.5 and 35°C, and its activity was independent of metal ions. The molecular mass of native RpiB was estimated to be 98.2 kDa as a tetramer using Sephacryl S-300 gel filtration. The enzyme showed specificity for aldose substrates possessing hydroxyl groups oriented in the same direction at the C2 and C3 positions such as L-lysose,L-talose, D-ribose, D-allose, Dgulose, D-xylose, and L-mannose. Especially, the RpiB exhibited high enzyme activity for the L-form aldoses such as L-lyxose and L-talose among various aldoses. The catalytic efficiency (kcat/Km) of RpiB for L-lyxose and L-talose were 3.86 and 1.2 mM-1s-1, respectively. Recently, L-form sugars have been increased the interest as a potential functional material in the food and pharmaceutical industry. Thus, it is suggested strongly that of RpiB from Streptococcus pneumonia is applied usefully for the production of L-form sugars.
한국생물공학회 [The Korean Society for Biotechnology and Bioengineering]
설립연도
1984
분야
공학>생물공학
소개
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