Applied Biochemistry and Biotechnology

, Volume 187, Issue 1, pp 116–128 | Cite as

One-Step Bioprocess of Inulin to Product Inulo-Oligosaccharides Using Bacillus subtilis Secreting an Extracellular Endo-Inulinase

  • Ruifan Jiang
  • Yibin Qiu
  • Weiwei Huang
  • Li Zhang
  • Feng Xue
  • Hao Ni
  • Difen Mei
  • Jian GaoEmail author
  • Hong XuEmail author


Inulo-oligosaccharides (IOSs), a novel food additive and health product, represent a promising alternative to antibiotics. As prebiotics, IOSs can be obtained from inulin by endo-inulinase-mediated hydrolysis. Nonetheless, enzymatic catalysis is not feasible industrially because of the required catalytic conditions and cost. In this study, a 2331-bp optimized gene inuQ (from Pseudomonas mucidolens) encoding endo-inulinase was cloned into shuttle vector PHY300PLK and transfected into Bacillus subtilis WB800-R, with the simultaneous deletion of gene sacC encoding levanase. The maximal IOS yield after hydrolysis of the crude extract of inulin was 67.84 ± 0.72 g/L for a recombinant strain with the signal peptide nprB from alkaline protease and promoter P43. The conversion rate reached 75.38%. For the major IOSs, the degree of polymerization was between 3 and 5. This study offers a simple and efficient one-step bioprocess for IOS production from inulin through secretion of an extracellular heterologous endo-inulinase by B. subtilis.


Inulo-oligosaccharides Inulin Endo-inulinase Bacillus subtilis 


Funding Information

This work was financially supported by the National Natural Science Foundation of China (Grant 21376203), the Promotion Program of Achievements in Scientific Research for Industrial Production of Higher Education of Jiangsu Province (Grant JHB2011-54), Qinglan Project of Higher Education of Jiangsu Province, Overseas Research & Training Program for University Prominent Young & Middle-aged Teachers and Presidents of Jiangsu Province, Jiangsu Agricultural Key Technology Research and Development Program (Grant BE2012394).

Compliance with Ethical Standards

Conflict of Interest

The authors declare that they have no conflict of interest.

Supplementary material

12010_2018_2806_MOESM1_ESM.docx (83 kb)
ESM 1 (DOCX 82 kb)


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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Ruifan Jiang
    • 1
    • 2
  • Yibin Qiu
    • 1
  • Weiwei Huang
    • 1
  • Li Zhang
    • 2
  • Feng Xue
    • 2
  • Hao Ni
    • 2
  • Difen Mei
    • 2
  • Jian Gao
    • 2
    Email author
  • Hong Xu
    • 1
    Email author
  1. 1.State Key Laboratory of Materials-Oriented Chemical Engineering, College of Food Science and Light IndustryNanjing Tech UniversityNanjingPeople’s Republic of China
  2. 2.School of Marine and BioengineeringYancheng Institute of TechnologyYanchengPeople’s Republic of China

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