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Restoration of cellulase activity in the inactive cellulosomal protein Cel9V from Ruminiclostridium cellulolyticum.
FEBS Letters 2018 January
Ruminiclostridium cellulolyticum produces extracellular cellulosomes which contain interalia numerous family-9 glycoside hydrolases, including the inactive Cel9V. The latter shares the same organization and 79% sequence identity with the active cellulase Cel9E. Nevertheless, two aromatic residues and a four-residue stretch putatively critical for the activity are missing in Cel9V. Introduction of one Trytophan and the four-residue stretch restored some weak activity in Cel9V, whereas the replacement of its catalytic domain by that of Cel9E generated a fully active cellulase. Altogether our data indicate that a series of mutations in the catalytic domain of Cel9V lead to an essentially inactive cellulase.
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