5FU2

The complexity of the Ruminococcus flavefaciens cellulosome reflects an expansion in glycan recognition


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.160 

Starting Model: experimental
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This is version 2.1 of the entry. See complete history


Literature

Complexity of the Ruminococcus Flavefaciens Cellulosome Reflects an Expansion in Glycan Recognition.

Venditto, I.Luis, A.S.Rydahl, M.Schuckel, J.Fernandes, V.O.Vidal-Melgosa, S.Bule, P.Goyal, A.Pires, V.M.R.Dourado, C.G.Ferreira, L.M.A.Coutinho, P.M.Henrissat, B.Knox, J.P.Basle, A.Najmudin, S.Gilbert, H.J.Willats, W.G.T.Fontes, C.M.G.A.

(2016) Proc Natl Acad Sci U S A 113: 7136

  • DOI: https://doi.org/10.1073/pnas.1601558113
  • Primary Citation of Related Structures:  
    4D3L, 4V17, 4V18, 4V1B, 4V1I, 4V1K, 4V1L, 5AOS, 5AOT, 5FU2, 5FU3, 5FU4, 5FU5

  • PubMed Abstract: 

    The breakdown of plant cell wall (PCW) glycans is an important biological and industrial process. Noncatalytic carbohydrate binding modules (CBMs) fulfill a critical targeting function in PCW depolymerization. Defining the portfolio of CBMs, the CBMome, of a PCW degrading system is central to understanding the mechanisms by which microbes depolymerize their target substrates. Ruminococcus flavefaciens, a major PCW degrading bacterium, assembles its catalytic apparatus into a large multienzyme complex, the cellulosome. Significantly, bioinformatic analyses of the R. flavefaciens cellulosome failed to identify a CBM predicted to bind to crystalline cellulose, a key feature of the CBMome of other PCW degrading systems. Here, high throughput screening of 177 protein modules of unknown function was used to determine the complete CBMome of R. flavefaciens The data identified six previously unidentified CBM families that targeted β-glucans, β-mannans, and the pectic polysaccharide homogalacturonan. The crystal structures of four CBMs, in conjunction with site-directed mutagenesis, provide insight into the mechanism of ligand recognition. In the CBMs that recognize β-glucans and β-mannans, differences in the conformation of conserved aromatic residues had a significant impact on the topology of the ligand binding cleft and thus ligand specificity. A cluster of basic residues in CBM77 confers calcium-independent recognition of homogalacturonan, indicating that the carboxylates of galacturonic acid are key specificity determinants. This report shows that the extended repertoire of proteins in the cellulosome of R. flavefaciens contributes to an extended CBMome that supports efficient PCW degradation in the absence of CBMs that specifically target crystalline cellulose.


  • Organizational Affiliation

    Interdisciplinary Centre of Research in Animal Health, Faculdade de Medicina Veterinária, Universidade de Lisboa, Pólo Universitário do Alto da Ajuda, 1300-477 Lisbon, Portugal; Institute for Cell and Molecular Biosciences, Newcastle University, Newcastle upon Tyne NE2 4HH, United Kingdom;


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
CBM74-RFGH5
A, B
106Ruminococcus flavefaciensMutation(s): 0 
UniProt
Find proteins for A0A1A9TAF4 (Ruminococcus flavefaciens)
Explore A0A1A9TAF4 
Go to UniProtKB:  A0A1A9TAF4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A1A9TAF4
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-4)-beta-D-mannopyranose
C
5N/A
Glycosylation Resources
GlyTouCan:  G91924WY
GlyCosmos:  G91924WY
GlyGen:  G91924WY
Entity ID: 3
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-4)-beta-D-mannopyranose-(1-4)-beta-D-mannopyranose
D
7N/A
Glycosylation Resources
GlyTouCan:  G80812WN
GlyCosmos:  G80812WN
GlyGen:  G80812WN
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.40 Å
  • R-Value Free: 0.200 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.160 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 45.623α = 90
b = 47.272β = 90
c = 83.958γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
Aimlessdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-06-22
    Type: Initial release
  • Version 1.1: 2016-07-13
    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: 2024-01-10
    Changes: Data collection, Database references, Refinement description, Structure summary