Integration of Bacterial Expansin on Agarolytic Complexes to Enhance the Degrading Activity of Red Algae by Control of Gelling Properties

Da Woon Jeong, Jeong Eun Hyeon, Young Chul Joo, Sang Kyu Shin, Sung Ok Han

Research output: Contribution to journalArticle

2 Citations (Scopus)


Expansin act by loosening hydrogen bonds in densely packed polysaccharides. This work characterizes the biological functions of expansin in the gelling and degradation of algal polysaccharides. In this study, the bacterial expansin BpEX from Bacillus pumilus was fused with the dockerin module of a cellulosome system for assembly with agarolytic complexes. The assembly of chimeric expansin caused an indicative enhancement in agarase activity. The enzymatic activities on agar substrate and natural biomass were 3.7-fold and 3.3-fold higher respectively than that of agarase as a single enzyme. To validate the effect on the agar degradation, the regulation potential of parameters related to gel rheology by bacterial expansin was experimentally investigated to indicate that the bacterial expansin lowered the gelling temperature and viscosity of agar. Thus, these results demonstrated the possibility of advancing more efficient strategies for utilizing agar as oligo sugar source in the biorefinery field that uses marine biomass as feedstocks.

Original languageEnglish
Pages (from-to)1-9
Number of pages9
JournalMarine Biotechnology
Publication statusAccepted/In press - 2017 Nov 18



  • Agar gel
  • Agarolytic complex
  • Bacterial expansin
  • Cellulosome
  • Red algae

ASJC Scopus subject areas

  • Biotechnology
  • Aquatic Science

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