CelAB, a Multifunctional Cellulase Encoded by Teredinibacter turnerae T7902T, a Culturable Symbiont Isolated from the Wood-Boring Marine Bivalve Lyrodus pedicellatus.

We characterized a multifunctional cellulase (CeIAB) encoded by the endosymbiont Teredinibacter turnerae T7902T. CeIAB contains two catalytic and two carbohydrate-binding domains, each separated by polyserine linker regions. CeIAB binds cellulose and chitin, degrades multiple complex polysaccharides, and displays two catalytic activities, cellobiohydrolase (EC 3.2.1.91) and β-1,4(3) endoglucanase (EC 3.2.1.4). [ABSTRACT FROM AUTHOR]