Enzymatic depolymerization of seaweed polysaccharides is gaining interest for the production of functional oligosaccharides and fermentable sugars. We describe a thermostable alginate lyase belonging to Polysaccharide Lyase family 7 (PL7), which can be used to degrade brown seaweed, Saccharina latissima, at conditions also suitable for a commercial cellulase cocktail (Cellic CTec2). This enzyme, AMOR_PL7A, is a β-D-mannuronate specific (EC 4.2.2.3) endoacting alginate lyase, which degrades

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... ate and poly-mannuronate within a broad range of pH, temperature and salinity. At 65 o C and pH 6.0, its Km and kcat values for sodium alginate are 0.51 +/-0.09 mg/mL and 7.8 +/-0.3 s -1 respectively. Degradation of seaweed with blends of Cellic CTec2 and AMOR_PL7A at 55 o C in seawater showed that the lyase efficiently reduces viscosity and increases glucose solublization. Thus, AMOR_PL7A may be useful in development of efficient protocols for enzymatic seaweed processing.