5A8O

Crystal structure of beta-glucanase SdGluc5_26A from Saccharophagus degradans in complex with cellotetraose


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.151 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 2.1 of the entry. See complete history


Literature

The Quaternary Structure of a Glycoside Hydrolase Dictates Specificity Towards Beta-Glucans

Lafond, M.Sulzenbacher, G.Freyd, T.Henrissat, B.Berrin, J.G.Garron, M.L.

(2016) J Biol Chem 291: 7183

  • DOI: https://doi.org/10.1074/jbc.M115.695999
  • Primary Citation of Related Structures:  
    5A8M, 5A8N, 5A8O, 5A8P, 5A8Q, 5A94, 5A95

  • PubMed Abstract: 

    In the Carbohydrate-Active Enzyme (CAZy) database, glycoside hydrolase family 5 (GH5) is a large family with more than 6,000 sequences. Among the 51 described GH5 subfamilies, subfamily GH5_26 contains members that display either endo-β(1,4)-glucanase or β(1,3;1,4)-glucanase activities. In this study, we focused on the GH5_26 enzyme fromSaccharophagus degradans(SdGluc5_26A), a marine bacterium known for its capacity to degrade a wide diversity of complex polysaccharides.SdGluc5_26A displays lichenase activity toward β(1,3;1,4)-glucans with a side cellobiohydrolase activity toward β(1,4)-glucans. The three-dimensional structure ofSdGluc5_26A adopts a stable trimeric quaternary structure also observable in solution. The N-terminal region ofSdGluc5_26A protrudes into the active site of an adjacent monomer. To understand whether this occupation of the active site could influence its activity, we conducted a comprehensive enzymatic characterization ofSdGluc5_26A and of a mutant truncated at the N terminus. Ligand complex structures and kinetic analyses reveal that the N terminus governs the substrate specificity ofSdGluc5_26A. Its deletion opens the enzyme cleft at the -3 subsite and turns the enzyme into an endo-β(1,4)-glucanase. This study demonstrates that experimental approaches can reveal structure-function relationships out of reach of current bioinformatic predictions.


  • Organizational Affiliation

    From the Institut des Sciences Moléculaires de Marseille-BiosCiences, UMR7313 CNRS, Aix-Marseille University, Pôle de l'Etoile, 13284 Marseille, France, the INRA, UMR1163, Biodiversité et Biotechnologie Fongiques, Aix-Marseille University, Polytech'Marseille, F-13288 Marseille, France.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
PUTATIVE RETAINING B-GLYCOSIDASE365Saccharophagus degradans 2-40Mutation(s): 1 
EC: 3.2.1.73
UniProt
Find proteins for Q21KE5 (Saccharophagus degradans (strain 2-40 / ATCC 43961 / DSM 17024))
Explore Q21KE5 
Go to UniProtKB:  Q21KE5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ21KE5
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

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Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-beta-D-glucopyranose
B
4N/A
Glycosylation Resources
GlyTouCan:  G00025MO
GlyCosmos:  G00025MO
GlyGen:  G00025MO
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PGE
Query on PGE

Download Ideal Coordinates CCD File 
J [auth A]
K [auth A]
L [auth A]
M [auth A]
N [auth A]
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A]
TRIETHYLENE GLYCOL
C6 H14 O4
ZIBGPFATKBEMQZ-UHFFFAOYSA-N
SO4
Query on SO4

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E [auth A],
F [auth A]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
GOL
Query on GOL

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G [auth A],
H [auth A],
I [auth A]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
CL
Query on CL

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C [auth A]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
MG
Query on MG

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D [auth A]MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
Biologically Interesting Molecules (External Reference) 1 Unique
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.173 
  • R-Value Work: 0.149 
  • R-Value Observed: 0.151 
  • Space Group: P 41 3 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 143.773α = 90
b = 143.773β = 90
c = 143.773γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALAdata scaling
PHASERphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2016-01-20
    Type: Initial release
  • Version 1.1: 2016-04-06
    Changes: Database references
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Other, Structure summary
  • Version 2.1: 2024-01-10
    Changes: Data collection, Database references, Refinement description, Structure summary