Backbone 1H, 13C, and 15N resonance assignments of BoMan26A, a β-mannanase of the glycoside hydrolase family 26 from the human gut bacterium Bacteroides ovatus

Biomol NMR Assign. 2019 Apr;13(1):213-218. doi: 10.1007/s12104-019-09879-w. Epub 2019 Feb 7.


Bacteroides ovatus is a member of the human gut microbiota. The importance of this microbial consortium involves the degradation of complex dietary glycans mainly conferred by glycoside hydrolases. In this study we focus on one such catabolic glycoside hydrolase from B. ovatus. The enzyme, termed BoMan26A, is a β-mannanase that takes part in the hydrolytic degradation of galactomannans. The crystal structure of BoMan26A has previously been determined to reveal a TIM-barrel like fold, but the relation between the protein structure and the mode of substrate processing has not yet been studied. Here we report residue-specific assignments for 95% of the 344 backbone amides of BoMan26A. The assignments form the basis for future studies of the relationship between substrate interactions and protein dynamics. In particular, the potential role of loops adjacent to glycan binding sites is of interest for such studies.

Keywords: Glycoside hydrolase; Polysaccharide utilization locus; TIM-barrel; β-Mannanase.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacteroides / enzymology*
  • Carbon Isotopes
  • Gastrointestinal Microbiome*
  • Humans
  • Nitrogen Isotopes
  • Nuclear Magnetic Resonance, Biomolecular*
  • Protein Structure, Secondary
  • Protons
  • beta-Mannosidase / chemistry*


  • Carbon Isotopes
  • Nitrogen Isotopes
  • Nitrogen-15
  • Protons
  • beta-Mannosidase
  • Carbon-13