Background: Carbohydrate binding modules (CBMs) specific to chitosan have yet to be identified. Results: Two CBMs located at the C terminus of a chitosanase from Paenibacillus sp. IK-5 specifically bound chitosan oligosaccharides. Conclusion: Individual CBMs can accommodate at least two glucosamine units at loops extruded from the core -sandwich. Significance: The synergistic action of the two CBMs appears to facilitate chitosan hydrolysis.
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