2ZF9

Crystal structure of a type III cohesin module from the cellulosomal ScaE cell-surface anchoring scaffoldin of Ruminococcus flavefaciens


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.164 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Cohesin diversity revealed by the crystal structure of the anchoring cohesin from Ruminococcus flavefaciens.

Alber, O.Noach, I.Rincon, M.T.Flint, H.J.Shimon, L.J.W.Lamed, R.Frolow, F.Bayer, E.A.

(2009) Proteins 77: 699-709

  • DOI: 10.1002/prot.22483
  • Primary Citation of Related Structures:  
    2ZF9

  • PubMed Abstract: 
  • The cellulosome is an intriguing multienzyme complex found in cellulolytic bacteria that plays a key role in the degradation of plant cell-wall polysaccharides. In Ruminococcus flavefaciens, a predominant fiber-degrading bacterium found in ruminants, the cellulosome is anchored to the bacterial cell wall through a relatively short ScaE scaffoldin ...

    The cellulosome is an intriguing multienzyme complex found in cellulolytic bacteria that plays a key role in the degradation of plant cell-wall polysaccharides. In Ruminococcus flavefaciens, a predominant fiber-degrading bacterium found in ruminants, the cellulosome is anchored to the bacterial cell wall through a relatively short ScaE scaffoldin. Determination of the crystal structure of the lone type-III ScaE cohesin from R. flavefaciens (Rf-CohE) was initiated as a part of a structural effort to define cellulosome assembly. The structure was determined at 1.95 A resolution by single-wavelength anomalous diffraction. This is the first detailed description of a crystal structure for a type-III cohesin, and its features were compared with those of the known type-I and type-II cohesin structures. The Rf-CohE module folds into a nine-stranded beta-sandwich with jellyroll topology, typically observed for cohesins, and includes two beta-flaps in the midst of beta-strands 4 and 8, similar to the type-II cohesin structures. However, the presence in Rf-CohE of an additional 13-residue alpha-helix located between beta-strands 8 and 9 represents a dramatic divergence from other known cohesin structures. The prominent alpha-helix is enveloped by an extensive N-terminal loop, not observed in any other known cohesin, which embraces the helix presumably enhancing its stability. A planar surface at the upper portion of the front face of the molecule, bordered by beta-flap 8, exhibits plausible dimensions and exposed amino acid residues to accommodate the dockerin-binding site.


    Related Citations: 
    • Preliminary X-ray characterization of a novel type of anchoring cohesin from the cellulosome of Ruminococcus flavefaciens
      Alber, O., Noach, I., Lamed, R., Shimon, J.W.L., Bayer, E.A., Frolow, F.
      () To be published --: --

    Organizational Affiliation

    Department of Biological Chemistry, The Weizmann Institute of Science, Rehovot 76100, Israel.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ScaE cell-surface anchored scaffoldin proteinA, B, C, D194Ruminococcus flavefaciensMutation(s): 0 
Gene Names: scaE
Find proteins for Q4A3Y2 (Ruminococcus flavefaciens)
Explore Q4A3Y2 
Go to UniProtKB:  Q4A3Y2
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
GOL
Query on GOL

Download Ideal Coordinates CCD File 
E [auth B]GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
CL
Query on CL

Download Ideal Coordinates CCD File 
F [auth B]CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A, B, C, DL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.95 Å
  • R-Value Free: 0.211 
  • R-Value Work: 0.162 
  • R-Value Observed: 0.164 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 155.56α = 90
b = 69.25β = 123.37
c = 93.03γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
MxCuBEdata collection
DENZOdata reduction
SCALEPACKdata scaling
SHELXCDphasing
SHELXEmodel building

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2008-12-30
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2017-10-11
    Changes: Refinement description