1F9O

Crystal structure of the cellulase Cel48F from C. Cellulolyticum with the thiooligosaccharide inhibitor PIPS-IG3


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.179 

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This is version 3.0 of the entry. See complete history


Literature

Crystal Structures of the Cellulase Cel48F in Complex with Inhibitors and Substrates Give Insights Into its Processive Action

Parsiegla, G.Reverbel-Leroy, C.Tardif, C.Belaich, J.P.Driguez, H.Haser, R.

(2000) Biochemistry 39: 11238-11246

  • DOI: 10.1021/bi001139p
  • Primary Citation of Related Structures:  
    1F9D, 1F9O, 1FAE, 1FBO, 1FBW

  • PubMed Abstract: 
  • Cellulase Cel48F from Clostridium cellulolyticum was described as a processive endo-cellulase. The active site is composed of a 25 A long tunnel which is followed by an open cleft. During the processive action, the cellulose substrate has to slide through the tunnel to continuously supply the leaving group site with sugar residues after the catalytic cleavage ...

    Cellulase Cel48F from Clostridium cellulolyticum was described as a processive endo-cellulase. The active site is composed of a 25 A long tunnel which is followed by an open cleft. During the processive action, the cellulose substrate has to slide through the tunnel to continuously supply the leaving group site with sugar residues after the catalytic cleavage. To study this processive action in the tunnel, the native catalytic module of Cel48F and the inactive mutant E55Q, have been cocrystallized with cellobiitol, two thio-oligosaccharide inhibitors (PIPS-IG3 and IG4) and the cello-oligosaccharides cellobiose, -tetraose and -hexaose. Seven sub-sites in the tunnel section of the active center could be identified and three of the four previously reported sub-sites in the open cleft section were reconfirmed. The sub-sites observed for the thio-oligosaccharide inhibitors and oligosaccharides, respectively, were located at two different positions in the tunnel corresponding to a shift in the chain direction of about a half sugar subunit. These two positions have different patterns of stacking interactions with aromatic residues present in the tunnel. Multiple patterns are not observed in nonprocessive endo-cellulases, where only one sugar position is favored by aromatic stacking. It is therefore proposed that the aromatic residues serve as lubricating agents to reduce the sliding barrier in the processive action.


    Related Citations: 
    • The crystal structure of the processive endocellulase CelF of Clostridium cellulolyticum in complex with a thiooligosaccharide inhibitor at 2.0 A
      Parsiegla, G., Juy, M., Reverbel-Leroy, C., Tardif, C., Belaich, J.P., Driguez, H., Haser, R.
      (1998) EMBO J 17: 5551

    Organizational Affiliation

    Institut de Biologie et Chimie des Protéines, Laboratoire de Bio-Cristallographie, Centre National de la Recherche Scientifique UMR 5086 and Université Claude Bernard Lyon I, 7 passage du Vercors, 69367 Lyon Cedex 07, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ENDO-1,4-BETA-GLUCANASE FA629Ruminiclostridium cellulolyticumMutation(s): 0 
EC: 3.2.1.4
UniProt
Find proteins for P37698 (Ruminiclostridium cellulolyticum (strain ATCC 35319 / DSM 5812 / JCM 6584 / H10))
Explore P37698 
Go to UniProtKB:  P37698
Protein Feature View
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChainsChain Length2D Diagram Glycosylation3D Interactions
beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-4-iodophenyl 1,4-dithio-beta-D-glucopyranosideB, C3 N/A Oligosaccharides Interaction
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CA
Query on CA

Download Ideal Coordinates CCD File 
D [auth A]CALCIUM ION
Ca
BHPQYMZQTOCNFJ-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.243 
  • R-Value Work: 0.179 
  • R-Value Observed: 0.179 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 61.6α = 90
b = 84.57β = 90
c = 121.82γ = 90
Software Package:
Software NamePurpose
CNSrefinement
SCALAdata scaling
X-PLORmodel building
X-PLORrefinement
DENZOdata reduction
CCP4data scaling
X-PLORphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2000-08-02
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 1.3: 2019-07-24
    Changes: Advisory, Data collection, Derived calculations, Refinement description
  • Version 1.4: 2019-08-14
    Changes: Data collection
  • Version 2.0: 2020-07-01
    Changes: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
  • Version 3.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Structure summary