3BWZ

Crystal structure of the type II cohesin module from the cellulosome of Acetivibrio cellulolyticus with an extended linker conformation


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.152 
  • R-Value Work: 0.122 

wwPDB Validation 3D Report Full Report


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Literature

Intermodular linker flexibility revealed from crystal structures of adjacent cellulosomal cohesins of Acetivibrio cellulolyticus.

Noach, I.Frolow, F.Alber, O.Lamed, R.Shimon, L.J.Bayer, E.A.

(2009) J.Mol.Biol. 391: 86-97

  • DOI: 10.1016/j.jmb.2009.06.006
  • Primary Citation of Related Structures:  
  • Also Cited By: 3L8Q

  • PubMed Abstract: 
  • Cellulosome complexes comprise an intercalated set of multimodular dockerin-containing enzymatic subunits connected to cohesin-containing nonenzymatic subunits called scaffoldins. The adjoining modules in each cellulosomal subunit are interconnected ...

    Cellulosome complexes comprise an intercalated set of multimodular dockerin-containing enzymatic subunits connected to cohesin-containing nonenzymatic subunits called scaffoldins. The adjoining modules in each cellulosomal subunit are interconnected by a variety of linker segments of different lengths and composition. The exact role of the cellulosomal linkers has yet to be described, although it is assumed that they contribute to the architecture and action of the cellulosome by providing the protein subunits with flexibility and by providing spacers between the enzymatic modules that could enhance interactions with the cellulose substrate. Here we present four crystal structures of Acetivibrio cellulolyticus cellulosomal type II cohesins with linker extensions. Two of the structures represent two different crystal forms (trigonal and orthorhombic) of the same N-terminal cohesin module (CohB1) together with its full (6-residue) native C-terminal linker, derived from scaffoldin B. The other two structures belong to the adjacent (second) cohesin module (CohB2), each of which was crystallized with the same 6-residue linker segment, but now positioned at the N-terminus and with either a truncated (5-residue) or a full-length (45-residue) C-terminal linker, respectively. Comparison between the two CohB1 structures revealed significant differences in the conformation of their equivalent C-terminal linker segment. In one crystal form a helical conformation was observed, as opposed to an extended conformation in the other. The CohB2 structures also displayed diverse conformations in their linker segments. In these structures, different linker conformations were observed in the individual molecules within the asymmetric unit of each structure. This conformational diversity implies that the linkers may adopt alternative conformations in their natural environment, consistent with varying environmental conditions. The findings suggest that linkers can play an important role in the assembly, dynamics and function of the cellulosomal components.


    Related Citations: 
    • Preliminary x-ray characterisation and phasing of a type II cohesin domain from the cellulosome of Acetivibrio cellulolyticus
      Noach, I.,Lamed, R.,Xu, Q.,Rosenheck, S.,Shimon, L.J.W.,Bayer, E.,Frolow, F.
      (2003) Acta Crystallogr.,Sect.D D59: 1670


    Organizational Affiliation

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




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cellulosomal scaffoldin adaptor protein B
A
181Hungateiclostridium cellulolyticumMutation(s): 0 
Gene Names: scaB
Find proteins for Q7WYN3 (Hungateiclostridium cellulolyticum)
Go to UniProtKB:  Q7WYN3
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
EDO
Query on EDO

Download SDF File 
Download CCD File 
A
1,2-ETHANEDIOL
ETHYLENE GLYCOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
NO3
Query on NO3

Download SDF File 
Download CCD File 
A
NITRATE ION
N O3
NHNBFGGVMKEFGY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.2 Å
  • R-Value Free: 0.152 
  • R-Value Work: 0.122 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 37.455α = 90.00
b = 55.780β = 90.00
c = 87.912γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
HKL-3000data reduction
HKL-2000data collection
HKL-3000data scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-01-13
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance