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Overexpression and molecular characterization of Aga50D from Saccharophagus degradans 2-40: an exo-type β-agarase producing neoagarobiose

Applied Microbiology and Biotechnology volume 86, pages 227–234 (2010)Cite this article

Abstract

β-Agarases are mostly categorized into three glycoside hydrolase (GH) families 16, 50, and 86. Recent genomic analysis of Saccharophagus degradans 2–40 revealed the presence of five agarase genes belonging to these GH families. Among the five agarases, Aga50D (a member of GH50) had neither been functionally characterized nor overexpressed. In this report, we present soluble overexpression and molecular characterization of Aga50D. Aga50D was expressed in an active form resulting in a single major product from agarose without intermediates. While known GH50 agarases have both endo-lytic and exo-lytic activities, which produce neoagarobiose as a final product through the intermediate, neoagaro-oligosaccharides, identification and analysis of the reaction product by mass spectrometry and 13C NMR showed that Aga50D had unique exo-lytic activity and was able to produce neoagarobiose directly from agarose. The optimum pH and temperature for the activity were 7.0 and 30°C, respectively. The K m and V max for agarose were 41.9 mg/ml (4.2 mM) and 17.9 U/mg, respectively.

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Affiliations

  1. School of Life Sciences and Biotechnology, Korea University, Anam-Dong Seongbuk-Gu, Seoul, 136-713, Korea

    Hee Taek Kim, Dongho Lee & Kyoung Heon Kim

  2. Division of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Anam-Dong, Seongbuk-Gu, Seoul, 136-713, Korea

    Saeyoung Lee, Won-Gi Bang & In-Geol Choi

  3. Department of Life Science, College of Natural Sciences, Ehwa Womans University, Seoul, 120-750, Korea

    Hyun-Soo Kim

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  1. Hee Taek Kim
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  2. Saeyoung Lee
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  3. Dongho Lee
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  4. Hyun-Soo Kim
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  6. Kyoung Heon Kim
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  7. In-Geol Choi
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Correspondence to In-Geol Choi.

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Hee Taek Kim and Saeyoung Lee contributed equally to this study.

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Kim, H.T., Lee, S., Lee, D. et al. Overexpression and molecular characterization of Aga50D from Saccharophagus degradans 2-40: an exo-type β-agarase producing neoagarobiose. Appl Microbiol Biotechnol 86, 227–234 (2010). https://doi.org/10.1007/s00253-009-2256-5

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  • DOI: https://doi.org/10.1007/s00253-009-2256-5

Keywords

  • β-Agarase
  • GH50
  • Exo-lytic activity
  • Neoagarobiose
  • Saccharification