1IEX

Crystal structure of barley beta-D-glucan glucohydrolase isoenzyme Exo1 in complex with 4I,4III,4V-S-trithiocellohexaose

• PDB DOI: https://doi.org/10.2210/pdb1IEX/pdb

• Classification: HYDROLASE
• Organism(s): Hordeum vulgare
• Mutation(s): No 


• Deposited: 2001-04-11 Released: 2001-11-14 
• Deposition Author(s): Hrmova, M., DeGori, R., Fincher, G.B., Smith, B.J., Driguez, H., Varghese, J.N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.211 
• R-Value Work: 0.178 

Literature

Catalytic mechanisms and reaction intermediates along the hydrolytic pathway of a plant beta-D-glucan glucohydrolase.

Hrmova, M., Varghese, J.N., De Gori, R., Smith, B.J., Driguez, H., Fincher, G.B.

(2001) Structure 9: 1005-1016

• PubMed: 11709165 
• DOI: https://doi.org/10.1016/s0969-2126(01)00673-6
• Primary Citation of Related Structures:  
  1IEQ, 1IEV, 1IEW, 1IEX


• PubMed Abstract: 
  

  Barley beta-D-glucan glucohydrolases represent family 3 glycoside hydrolases that catalyze the hydrolytic removal of nonreducing glucosyl residues from beta-D-glucans and beta-D-glucooligosaccharides. After hydrolysis is completed, glucose remains bound in the active site.

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Organizational Affiliation: 

Department of Plant Science, University of Adelaide, Waite Campus, 5064, Glen Osmond, SA, Australia. [e-mail]

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 67.15 kDa 
• Atom Count: 4,987 
• Modelled Residue Count: 603 
• Deposited Residue Count: 605 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
BETA-D-GLUCAN GLUCOHYDROLASE ISOENZYME EXO1	A	605	Hordeum vulgare	Mutation(s): 0  EC: 3.2.1.58
UniProt
Find proteins for Q9XEI3 (Hordeum vulgare subsp. vulgare) Explore Q9XEI3  Go to UniProtKB:  Q9XEI3

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-2)-alpha-D-mannopyranose-(1-6)-beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-3)]2-acetamido-2-deoxy-beta-D-glucopyranose	B	6		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G92311HB GlyCosmos:  G92311HB GlyGen:  G92311HB

Entity ID: 3
Molecule	Chains	Length	2D Diagram	Glycosylation	3D Interactions
beta-D-glucopyranose-(1-4)-4-thio-beta-D-glucopyranose	C	2	N/A	N/A
Glycosylation Resources
GlyTouCan:  G98094RO GlyCosmos:  G98094RO

Small Molecules

Ligands 1 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

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 3
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_900034	C	thio-beta-cellobiose	Oligosaccharide / Substrate analog

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.211 
• R-Value Work: 0.178 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 102.42	α = 90
b = 102.42	β = 90
c = 185.48	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
CNS	refinement
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2001-11-14 
Deposition Author(s): Hrmova, M., DeGori, R., Fincher, G.B., Smith, B.J., Driguez, H., Varghese, J.N.

Revision History  

• Version 1.0: 2001-11-14
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary
• Version 2.1: 2023-08-16
  Changes: Data collection, Database references, Refinement description, Structure summary