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Vibrio alginolyticus ATCC 17749 was proved to produce an extracellular alginate lyase. The enzyme was purified from the culture fluid by ammonium sulfate precipitation followed by phenyl Sepharose CL-4B and blue Sepharose CL-6B chromatographies. The final enzyme preparation was homogeneous as judged by SDS-polyacrylamide gel electrophoresis. The lyase was found to be specific for β-1, 4 bonds involving D-mannuronate units in alginate. A calcium chloride concentration of 1×10-2M activated the enzyme to reach a maximal activity, and calcium chloride was also effective on the increase in thermostability of the enzyme.

Alginate Lyase from Vibrio alginolyticus ATCC 17749.