Cited by 262Enzyme Production and CharacterizationPolysaccharides and Plant Cell WallsPolysaccharides Composition and Applications

Agar degradation by microorganisms and agar-degrading enzymes

Chi, Won-Jae, Chang, Yong-Keun, Hong, Soon-Kwang·2012·Applied Microbiology and Biotechnology

Abstract

Agar is a mixture of heterogeneous galactans, mainly composed of 3,6-anhydro-L-galactoses (or L-galactose-6-sulfates) D-galactoses and L-galactoses (routinely in the forms of 3,6-anhydro-L-galactoses or L-galactose-6-sulfates) alternately linked by β-(1,4) and α-(1,3) linkages. It is a major component of the cell walls of red algae and has been used in a variety of laboratory and industrial applications, owing to its jellifying properties. Many microorganisms that can hydrolyze and metabolize agar as a carbon and energy source have been identified in seawater and marine sediments. Agarolytic microorganisms commonly produce agarases, which catalyze the hydrolysis of agar. Numerous agarases have been identified in microorganisms of various genera. They are classified according to their cleavage pattern into three types-α-agarase, β-agarase, and β-porphyranase. Although, in a broad sense, many other agarases are involved in complete hydrolysis of agar, most of those identified are β-agarases. In this article we review agarolytic microorganisms and their agar-hydrolyzing systems, covering β-agarases as well as α-agarases, α-neoagarobiose hydrolases, and β-porphyranases, with emphasis on the recent discoveries. We also present an overview of the biochemical and structural characteristics of the various types of agarases. Further, we summarize and compare the agar-hydrolyzing systems of two specific microorganisms: Gram-negative Saccharophagus degradans 2-40 and Gram-positive Streptomyces coelicolor A3(2). We conclude with a brief discussion of the importance of agarases and their possible future application in producing oligosaccharides with various nutraceutical activities and in sustainably generating stock chemicals for biorefinement and bioenergy.

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Crossref · 10.1007/s00253-012-4023-2

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  • The enzymatic breakdown of agarose is carried out by α-agarases and β-agarases, which hydrolyze agarose α-1,3 and β-1,4 linkages and produce agarobiose and neoagarobiose as final hydrolysis products, respectively.

    “The enzymatic breakdown of agarose is carried out by α-agarases (EC 3.2.1.158)and β-agarases (EC 3.2.1.81),which hydrolyze agarose α-1,3 and β-1,4 linkages and produce agarobiose and neoagarobiose as final hydrolysis products, respectively (Table 1).”

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Authors
Chi, W.-J., Chang, Y.-K., & Hong, S.-K.
Affiliations
Myongji University (KR)
Corresponding author
Hong, Soon-Kwang
Venue
Applied Microbiology and Biotechnology
Published
2012-04-19
Volume
94
Issue
4
Pages
917-930
ISSN
  • 0175-7598 (ISSN-L)
  • 1432-0614
OpenAlex
W2048637284
Cited by
262
References
102
Citations by year
2026: 12 · 2025: 18 · 2024: 17 · 2023: 22 · 2022: 17 · 2021: 25 · 2020: 21 · 2019: 16 · 2018: 23 · 2017: 19 · 2016: 24 · 2015: 16 · 2014: 19 · 2013: 11 · 2012: 2
FWCI
1.82
Type
journal article
Language
en
Open access
closed
Locations
  • Applied Microbiology and Biotechnology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biotechnology › Enzyme Production and Characterization
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Polysaccharides and Plant Cell Walls
  • Life Sciences › Agricultural and Biological Sciences › Food Science › Polysaccharides Composition and Applications
Keywords
agar degradation, agarase, β-agarase, agar hydrolysis, Streptomyces coelicolor A3(2), oligosaccharide production, nutraceuticals, bioenergy, marine sediment
MeSH terms
Agar, Glycoside Hydrolases, Hydrolysis, Protein Conformation, Seawater, Geologic Sediments, Alteromonadaceae, Streptomyces coelicolor

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