Crystal structure of Podospora anserina GH26-CBM35 beta-(1,4)- mannanase

Experimental Data Snapshot

  • Resolution: 2.85 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 

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This is version 2.1 of the entry. See complete history


Structural and Biochemical Analyses of Glycoside Hydrolase Families 5 and 26 Beta-(1,4)-Mannanases from Podospora Anserina Reveal Differences Upon Manno-Oligosaccharides Catalysis.

Couturier, M.Roussel, A.Rosengren, A.Leone, P.Stalbrand, H.Berrin, J.G.

(2013) J Biol Chem 288: 14624

  • DOI: https://doi.org/10.1074/jbc.M113.459438
  • Primary Citation of Related Structures:  
    3ZIZ, 3ZM8

  • PubMed Abstract: 

    The microbial deconstruction of the plant cell wall is a key biological process that is of increasing importance with the development of a sustainable biofuel industry. The glycoside hydrolase families GH5 (PaMan5A) and GH26 (PaMan26A) endo-β-1,4-mannanases from the coprophilic ascomycete Podospora anserina contribute to the enzymatic degradation of lignocellulosic biomass. In this study, P. anserina mannanases were further subjected to detailed comparative analysis of their substrate specificities, active site organization, and transglycosylation capacity. Although PaMan5A displays a classical mode of action, PaMan26A revealed an atypical hydrolysis pattern with the release of mannotetraose and mannose from mannopentaose resulting from a predominant binding mode involving the -4 subsite. The crystal structures of PaMan5A and PaMan26A were solved at 1.4 and 2.85 Å resolution, respectively. Analysis of the PaMan26A structure supported strong interaction with substrate at the -4 subsite mediated by two aromatic residues Trp-244 and Trp-245. The PaMan26A structure appended to its family 35 carbohydrate binding module revealed a short and proline-rich rigid linker that anchored together the catalytic and the binding modules.

  • Organizational Affiliation

    INRA, UMR1163 BCF, Aix Marseille Université, Polytech Marseille, F-13288 Marseille, France.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
GH26 ENDO-BETA-1,4-MANNANASE475Podospora anserina S mat+Mutation(s): 0 
Find proteins for E2GHW2 (Podospora anserina)
Explore E2GHW2 
Go to UniProtKB:  E2GHW2
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupE2GHW2
Sequence Annotations
  • Reference Sequence


Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
Glycosylation Resources
GlyTouCan:  G42666HT
GlyCosmos:  G42666HT
GlyGen:  G42666HT
Experimental Data & Validation

Experimental Data

  • Resolution: 2.85 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.206 
  • R-Value Observed: 0.209 
  • Space Group: P 65 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 97.49α = 90
b = 97.49β = 90
c = 268.717γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
SCALAdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-04-17
    Type: Initial release
  • Version 1.1: 2013-06-12
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary
  • Version 2.1: 2023-12-20
    Changes: Data collection, Database references, Refinement description, Structure summary