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Mannanase Man26A from Cellulomonas fimi has a mannan-binding module
D Stoll1, A Boraston, H Stålbrand
1Department of Microbiology and Immunology, University of British Columbia, Vancouver, B.C., Canada.
FEMS Microbiology Letters
|February 17, 2000
Summary
This study identifies a novel mannan-binding module (Man26Abm) in the modular mannanase Man26A. This module selectively binds soluble mannans, like locust bean gum, but not insoluble ones.
Area of Science:
- Biochemistry
- Enzymology
- Microbiology
Background:
- Mannanases are enzymes that degrade mannans, important polysaccharides in plant cell walls.
- Modular enzymes often possess distinct functional domains, including substrate-binding modules.
- Understanding substrate specificity is crucial for enzyme applications.
Purpose of the Study:
- To characterize the substrate-binding properties of the mannan-binding module (Man26Abm) from the modular mannanase Man26A.
- To determine the specificity of Man26Abm for different polysaccharide substrates.
Main Methods:
- Purification and characterization of the mannan-binding module (Man26Abm).
- Binding assays using soluble and insoluble mannans, cellulose, chitin, and xylan.
- Determination of binding affinity (K(d)) using locust bean gum (LBG).
Main Results:
- Man26Abm specifically binds to soluble mannans.
- No binding was observed for insoluble mannans, cellulose, chitin, or xylan.
- The dissociation constant (K(d)) for Man26Abm binding to LBG was determined to be approximately 0.2 microM.
Conclusions:
- Man26A is the first reported mannanase to possess a dedicated mannan-binding module.
- The Man26Abm module exhibits high specificity for soluble mannans, indicating a potential role in targeted mannan degradation.