5JVK

Structural insights into a family 39 glycoside hydrolase from the gut symbiont Bacteroides cellulosilyticus WH2.

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 

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Literature

Structural insights into a family 39 glycoside hydrolase from the gut symbiont Bacteroides cellulosilyticus WH2.

Ali-Ahmad, A., Garron, M.L., Zamboni, V., Lenfant, N., Nurizzo, D., Henrissat, B., Berrin, J.G., Bourne, Y., Vincent, F.

(2017) J Struct Biol 197: 227-235

  • DOI: 10.1016/j.jsb.2016.11.004
  • Primary Citation of Related Structures:  
    5JVK

  • PubMed Abstract: 

    • Bacteria from the human gut are equipped with an arsenal of carbohydrate-active enzymes that degrade dietary and host-derived glycans. In this study, we present the 2.5Å resolution crystal structure of a member (GH39wh2) from the human gut bacteria Bacte ...

    Bacteria from the human gut are equipped with an arsenal of carbohydrate-active enzymes that degrade dietary and host-derived glycans. In this study, we present the 2.5Å resolution crystal structure of a member (GH39wh2) from the human gut bacteria Bacteroides cellulosilyticus WH2 representative of a new subgroup within family GH39. Together with 6 other GHs, GH39wh2 belongs to a polysaccharide utilization locus (PUL) that could be involved in detecting, binding and hydrolysing a specific carbohydrate species from the intestinal tract. GH39wh2 shares a similar architecture as other members of family GH39 dominated by a typical (β/α) 8 -barrel fold harboring the catalytic residues and decorated by β-sandwich accessory domains. The GH39wh2 structure unveils an atypical shallow groove rather than a deep pocket due to drastic rearrangements in surface loops surrounding the catalytic interface. These structural adaptations seem to favour recognition of large branched substrates and may explain the lack of activity of GH39wh2 toward small xylose-based and other typical substrates from GH39 members, emphasizing the molecular diversity within the GH39 family. A phylogenetic analysis of the entire GH39 family assigns GH39wh2 as a new subgroup, consistent with the extensive remodelling of the active site region that may confer new substrate specificity toward a complex glycan chain.

    Organizational Affiliation: 

    CNRS, Aix Marseille Univ, AFMB, Marseille, France; INRA, USC 1408, AFMB, Marseille, France. Electronic address: florence.vincent@afmb.univ-mrs.fr.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Uncharacterized protein A, B, C587Bacteroides cellulosilyticusMutation(s): 0 
Gene Names: BcellWH2_03314, DWX97_09960
Find proteins for A0A0N7IFL6 (Bacteroides cellulosilyticus)
Explore A0A0N7IFL6 
Go to UniProtKB:  A0A0N7IFL6
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.241 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.207 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 157.54α = 90
b = 157.54β = 90
c = 155.644γ = 120
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
SHARPphasing

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Vaincre la mucoviscidoseFrance--

Revision History 

  • Version 1.0: 2016-12-07
    Type: Initial release
  • Version 1.1: 2017-03-29
    Changes: Database references