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Updated: Aug 22, 2026
Structural Characterization of Mannan Cell Wall Polysaccharides in Plants Using PACE
Published on: October 16, 2017
Purification and characterization of an extracellular beta-1,4-mannanase from a marine bacterium, Vibrio sp. strain
Abstract:
A beta-mannanase (EC 3.2.1.78) from Vibrio sp. strain MA-138 was purified by ammonium sulfate precipitation and several chromatographic procedures including gel filtration, adsorption, and ion-exchange chromatographies. The final ion-exchange chromatography Mono Q yielded one major active fraction and three minor active fractions. The major active fraction was purified to homogeneity on the basis of native polyacrylamide gel electrophoresis (PAGE). This purified enzyme was identified as a glycoprotein by periodic acid-Schiff staining and a monomeric protein with a molecular mass of 49 kDa by sodium dodecyl sulfate-PAGE. The pI of the enzyme was 3.8. The purified enzyme exhibited maximal activity at pH 6.5 and 40 degrees C and hydrolyzed at random the internal beta-1,4-mannosidic linkages in beta-mannan to give various sizes of oligosaccharides. The first 20 N-terminal amino acid sequence of the purified enzyme showed high homology with the N-terminal region of beta-mannanase from Streptomyces lividans 66.
Insights
Researchers purified a beta-mannanase enzyme from Vibrio sp. strain MA-138. This enzyme efficiently breaks down beta-mannan into smaller oligosaccharides, showing potential for biotechnological applications.
Area of Science:
- Enzymology
- Microbiology
- Biochemistry
Background:
- Beta-mannanases are crucial enzymes for degrading beta-mannan, a major component of plant cell walls.
- Understanding the properties of novel beta-mannanases can lead to new biotechnological applications.
Purpose of the Study:
- To purify and characterize a beta-mannanase from Vibrio sp. strain MA-138.
- To investigate the enzyme's biochemical properties and N-terminal amino acid sequence.
Main Methods:
- Enzyme purification using ammonium sulfate precipitation and multiple chromatographic techniques (gel filtration, adsorption, ion-exchange).
- Homogeneity confirmed by native polyacrylamide gel electrophoresis (PAGE).
- Enzyme characterization including molecular mass (SDS-PAGE), pI, optimal pH, and temperature.
Main Results:
- A homogeneous beta-mannanase (49 kDa, pI 3.8) was purified.
- The enzyme is a glycoprotein with optimal activity at pH 6.5 and 40°C.
- It randomly hydrolyzes beta-1,4-mannosidic linkages in beta-mannan, producing oligosaccharides.
- The N-terminal sequence showed homology to other beta-mannanases.
Conclusions:
- The purified Vibrio sp. MA-138 beta-mannanase is a novel enzyme with potential for industrial applications.
- Its specific hydrolysis pattern and optimal conditions make it a candidate for biomass processing.
- Sequence homology suggests conserved functional regions among beta-mannanases.
