7CEL

CBH1 (E217Q) IN COMPLEX WITH CELLOHEXAOSE AND CELLOBIOSE

• PDB DOI:  https://doi.org/10.2210/pdb7CEL/pdb

• Classification: HYDROLASE
• Organism(s): Trichoderma reesei
• Expression System: Trichoderma reesei
• Mutation(s): Yes 


• Deposited: 1997-09-24 Released: 1997-12-24 
• Deposition Author(s): Divne, C., Stahlberg, J., Jones, T.A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.215 
• R-Value Work: 0.176 
• R-Value Observed: 0.176 

Literature

High-resolution crystal structures reveal how a cellulose chain is bound in the 50 A long tunnel of cellobiohydrolase I from Trichoderma reesei.

Divne, C., Stahlberg, J., Teeri, T.T., Jones, T.A.

(1998) J Mol Biol 275: 309-325

• PubMed: 9466911 
• DOI: https://doi.org/10.1006/jmbi.1997.1437
• Primary Citation of Related Structures:  
  5CEL, 6CEL, 7CEL


• PubMed Abstract: 
  

Detailed information has been obtained, by means of protein X-ray crystallography, on how a cellulose chain is bound in the cellulose-binding tunnel of cellobiohydrolase I (CBHI), the major cellulase in the hydrolysis of native, crystalline cellulose by the fungus Trichoderma reesei. Three high-resolution crystal structures of different catalytically deficient mutants of CBHI in complex with cellotetraose, cellopentaose and cellohexaose have been refined at 1.9, 1.7 and 1.9 A resolution, respectively. The observed binding of cellooligomers in the tunnel allowed unambiguous identification of ten well-defined subsites for glucosyl units that span a length of approximately 50 A. All bound oligomers have the same directionality and orientation, and the positions of the glucosyl units in each binding site agree remarkably well between the different complexes. The binding mode observed here corresponds to that expected during productive binding of a cellulose chain. The structures support the hypothesis that hydrolysis by CBHI proceeds from the reducing towards the non-reducing end of a cellulose chain, and they provide a structural explanation for the observed distribution of initial hydrolysis products.

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Related Citations: 

• Activity Studies and Crystal Structures of Catalytically Deficient Mutants of Cellobiohydrolase I from Trichoderma Reesei
  Stahlberg, J., Divne, C., Koivula, A., Piens, K., Claeyssens, M., Teeri, T.T., Jones, T.A.
  (1996) J Mol Biol 264: 337

• The Three-Dimensional Crystal Structure of the Catalytic Core of Cellobiohydrolase I from Trichoderma Reesei
  Divne, C., Stahlberg, J., Reinikainen, T., Ruohonen, L., Pettersson, G., Knowles, J.K., Teeri, T.T., Jones, T.A.
  (1994) Science 265: 524

• Crystallization and Preliminary X-Ray Studies on the Core Proteins of Cellobiohydrolase I and Endoglucanase I from Trichoderma Reesei
  Divne, C., Sinning, I., Stahlberg, J., Pettersson, G., Bailey, M., Siika-Aho, M., Margolles-Clark, E., Teeri, T., Jones, T.A.
  (1993) J Mol Biol 234: 905

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Organizational Affiliation: 

Department of Molecular Biology, Uppsala University, Sweden.

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 47.74 kDa 
• Atom Count: 3,643 
• Modelled Residue Count: 434 
• Deposited Residue Count: 434 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
1,4-BETA-D-GLUCAN CELLOBIOHYDROLASE I	A	434	Trichoderma reesei	Mutation(s): 1  Gene Names: cbh1 EC: 3.2.1.91
UniProt
Find proteins for P62694 (Hypocrea jecorina) Explore P62694  Go to UniProtKB:  P62694

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
beta-D-glucopyranose-(1-4)-beta-D-glucopyranose	B	2		N/A
Glycosylation Resources
GlyTouCan:  G84824ZO GlyCosmos:  G84824ZO

Entity ID: 3
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-beta-D-glucopyranose-(1-4)-beta-D-glucopyranose	C	6		N/A
Glycosylation Resources
GlyTouCan:  G09454VW GlyCosmos:  G09454VW GlyGen:  G09454VW

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	D [auth A]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
CO	E [auth A], F [auth A]	COBALT (II) ION Co XLJKHNWPARRRJB-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
PCA	A	L-PEPTIDE LINKING	C5 H7 N O3		GLN

Biologically Interesting Molecules (External Reference) 2 Unique

Entity ID: 2
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900005	B	beta-cellobiose	Oligosaccharide / Metabolism		Ligand Interaction

Entity ID: 3
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900020	C	beta-cellohexaose	Oligosaccharide / Metabolism		Ligand Interaction

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.215 
• R-Value Work: 0.176 
• R-Value Observed: 0.176 
• Space Group: I 2 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 83.7	α = 90
b = 84.1	β = 90
c = 111.5	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
CCP4	data reduction
X-PLOR	model building
X-PLOR	refinement
CCP4	data scaling
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-12-24 
Deposition Author(s): Divne, C., Stahlberg, J., Jones, T.A.

Revision History  

• Version 1.0: 1997-12-24
  Type: Initial release
  
• Version 1.1: 2008-03-25
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 2.0: 2019-12-25
  Changes: Atomic model, Data collection, Database references, Derived calculations, Polymer sequence
• Version 3.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Atomic model, Data collection, Derived calculations, Structure summary
• Version 3.1: 2021-11-03
  Changes: Database references, Derived calculations, Structure summary