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Cellulose digestion by common Japanese freshwater clam Corbicula japonica
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Cellulose digestion by common Japanese freshwater clam Corbicula japonica
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Journal Article
Cellulose digestion by common Japanese freshwater clam Corbicula japonica
2007
Overview
: Cellulose digestion by Corbicula japonica was investigated according to the hypothesis that without any symbiotic aid, this organism can utilize cellulose as a carbon source. Enzymatic studies revealed the complete cellulase activity of this species, and molecular cloning resulted in the isolation of cDNA with an ORF encoding a 596‐amino‐acid protein that shares significant homology with abalone and termite cellulases with an amino acid identity of 52.2% and 50.5%, respectively. The isolated cellulase had a carbohydrate‐binding module at the N‐terminal region that was also reportedly present in abalone cellulase, and its mRNA were specifically expressed in the digestive gland. These findings strongly support the assumption that C. japonica has an endogenous cellulose, as well as abalones and termites. It is further believed that C. japonica plays an important roll in decomposing cellulose, and consequently contributes to the carbon‐cycle in the aquatic environment, as termites do in terrestrial forests.
