Dual α-1,4- And β-1,4-Glycosidase Activities by the Novel Carbohydrate-Binding Module in α- l -Fucosidase from Vibrio sp. Strain EJY3

Hwaseok Hong, Do Hyoung Kim, Hogyun Seo, Kyoung Heon Kim, Kyung Jin Kim

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Carbohydrates are structurally and functionally diverse materials including polysaccharides, and marine organisms are known to have many enzymes for the breakdown of complex polysaccharides. Here, we identified an α-l-fucosidase enzyme from the marine bacterium Vibrio sp. strain EJY3 (VejFCD) that has dual α-1,4-glucosidic and β-1,4-galactosidic specificities. We determined the crystal structure of VejFCD and provided the structural basis underlying the dual α- and β-glycosidase activities of the enzyme. Unlike other three-domain FCDs, in VejFCD, carbohydrate-binding module-B (CBM-B) with a novel β-sandwich fold tightly contacts with the CatD/CBM-B main body and provides key residues for the β-1,4-glycosidase activity of the enzyme. The phylogenetic tree analysis suggests that only a few FCDs from marine microorganisms have the key structural features for dual α-1,4- and β-1,4-glycosidase activities. This study provides the structural insights into the mechanism underlying the novel glycoside hydrolase activities and could be applied for more efficient utilization in the hydrolysis of complex carbohydrates in biotechnological applications.

Original languageEnglish
Pages (from-to)3380-3389
Number of pages10
JournalJournal of agricultural and food chemistry
Issue number11
Publication statusPublished - 2021 Mar 24

Bibliographical note

Funding Information:
This work was supported by the Basic Science Research Program (NRF2020R1A4A1018332) and the Mid-career Researcher Program (2020R1A2B5B02002631) through the National Research Foundation of Korea (NRF) funded by the Korea government (MSIT).

Publisher Copyright:
© 2021 American Chemical Society.


  • Vibrio sp. strain EJY3
  • dual α-1,4- and β-1,4-glycosidase: carbohydrate-binding module
  • marine microorganism
  • α- l -fucosidase

ASJC Scopus subject areas

  • Chemistry(all)
  • Agricultural and Biological Sciences(all)


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