CelAB, a Multifunctional Cellulase Encoded by Teredinibacter turnerae T7902 T , a Culturable Symbiont Isolated from the Wood-Boring Marine Bivalve Lyrodus pedicellatus

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We characterized a multifunctional cellulase (CelAB) encoded by the endosymbiont Teredinibacter turnerae T7902(T). CelAB contains two catalytic and two carbohydrate-binding domains, each separated by polyserine linker regions. CelAB binds cellulose and chitin, degrades multiple complex polysaccharides, and displays two catalytic activities, cellobiohydrolase (EC 3.2.1.91) and beta-1,4(3) endoglucanase (EC 3.2.1.4).