Characterization of a recombinant endo-type alginate lyase (Alg7D) from Saccharophagus degradans.

Hee Taek Kim, Hyeok-Jin Ko, Nahyun Kim, Duwoon Kim, Dongho Lee, In-Geol Choi, Hee Chul Woo, Myoung Dong Kim, Kyoung Heon Kim

Index: Biotechnol. Lett. 34(6) , 1087-92, (2012)

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Abstract

A gene, alg7D, from Saccharophagus degradans, coding for a putative alginate lyase belonging to the family of polysaccharide lyase-7, was overexpressed in Escherichia coli. The properties of the recombinant Alg7D were characterized. The enzyme endolytically depolymerized alginate by β-elimination into oligo-alginates with degrees of polymerization of 2-5. Its activity was maximal at 50°C and pH 7 and was slightly increased in the presence of Na(+). The K(M), V(max), k(cat), and k(cat)/K(M) values were: 3 mg ml(-1), 6.2 U mg(-1), 1.9 × 10(-2) s(-1), and 6.3 × 10(-3) mg(-1 )ml s(-1), respectively.