Archives of Microbiology

, Volume 196, Issue 1, pp 17–23 | Cite as

The mannobiose-forming exo-mannanase involved in a new mannan catabolic pathway in Bacteroides fragilis

  • Kazuki Kawaguchi
  • Takeshi Senoura
  • Shigeaki Ito
  • Toki Taira
  • Hiroyuki Ito
  • Jun Wasaki
  • Susumu Ito
Original Paper

Abstract

We have proposed a new mannan catabolic pathway in Bacteroides fragilis NCTC 9343 that involves a putative mannanase ManA in glycoside hydrolase family 26 (BF0771), a mannobiose and/or sugar transporter (BF0773), mannobiose 2-epimerase (BF0774), and mannosylglucose phosphorylase (BF0772). If this hypothesis is correct, ManA has to generate mannobiose from mannans as the major end product. In this study, the BF0771 gene from the B. fragilis genome was cloned and expressed in Escherichia coli cells. The expressed protein was found to produce mannobiose exclusively from mannans and initially from manno-oligosaccharides. Production of 4-O-β-d-glucopyranosyl-d-mannose or 4-O-β-d-mannopyranosyl-d-glucose from mannans was not detectable. The results indicate that this enzyme is a novel mannobiose-forming exo-mannanase, consistent with the new microbial mannan catabolic pathway we proposed.

Keywords

Bacteroides fragilis Mannanase Mannobiose 2-epimerase Mannosylglucose phosphorylase 

Supplementary material

203_2013_938_MOESM1_ESM.pptx (1.1 mb)
Supplementary material 1 (PPTX 1103 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Kazuki Kawaguchi
    • 1
  • Takeshi Senoura
    • 2
  • Shigeaki Ito
    • 3
  • Toki Taira
    • 1
  • Hiroyuki Ito
    • 4
  • Jun Wasaki
    • 5
  • Susumu Ito
    • 1
  1. 1.Department of Bioscience and Biotechnology, Faculty of AgricultureUniversity of the RyukyusNishiharaJapan
  2. 2.Research Institute for Bioresources and BiotechnologyIshikawa Prefectural UniversityNonoichiJapan
  3. 3.Tobacco Science Research CenterJapan Tobacco Inc.YokohamaJapan
  4. 4.Department of Applied ChemistryAkita National College of TechnologyAkitaJapan
  5. 5.Graduate School of Biosphere ScienceHiroshima UniversityHigashi-HiroshimaJapan

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