1EX1

BETA-D-GLUCAN EXOHYDROLASE FROM BARLEY

• PDB DOI: https://doi.org/10.2210/pdb1EX1/pdb

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


• Deposited: 1998-11-10 Released: 1999-11-17 
• Deposition Author(s): Varghese, J.N., Hrmova, M., Fincher, G.B.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.202 
• R-Value Work: 0.170 

Literature

Three-dimensional structure of a barley beta-D-glucan exohydrolase, a family 3 glycosyl hydrolase.

Varghese, J.N., Hrmova, M., Fincher, G.B.

(1999) Structure 7: 179-190

• PubMed: 10368285 
• DOI: https://doi.org/10.1016/s0969-2126(99)80024-0
• Primary Citation of Related Structures:  
  1EX1


• PubMed Abstract: 
  

  Cell walls of the starchy endosperm and young vegetative tissues of barley (Hordeum vulgare) contain high levels of (1-->3,1-->4)-beta-D-glucans. The (1-->3,1-->4)-beta-D-glucans are hydrolysed during wall degradation in germinated grain and during wall loosening in elongating coleoptiles. These key processes of plant development are mediated by several polysaccharide endohydrolases and exohydrolases.

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Organizational Affiliation: 

Biomolecular Research Institute, 343 Royal Parade, Parkville, Victoria 3052 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: 66.97 kDa 
• Atom Count: 4,885 
• Modelled Residue Count: 602 
• Deposited Residue Count: 605 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (BETA-D-GLUCAN EXOHYDROLASE 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)-alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-D-fucopyranose-(1-3)]2-acetamido-2-deoxy-beta-D-glucopyranose	B	6		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G82785HO GlyCosmos:  G82785HO

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NAG	C [auth A]	2-acetamido-2-deoxy-beta-D-glucopyranose C8 H15 N O6 OVRNDRQMDRJTHS-FMDGEEDCSA-N
GLC	D [auth A]	alpha-D-glucopyranose C6 H12 O6 WQZGKKKJIJFFOK-DVKNGEFBSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.20 Å
• R-Value Free: 0.202 
• R-Value Work: 0.170 
• Space Group: P 4₃ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 102.09	α = 90
b = 102.09	β = 90
c = 184.5	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
PROTEIN	model building
SHARP	phasing
REFMAC	refinement
PROTEIN	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1999-11-17 
Deposition Author(s): Varghese, J.N., Hrmova, M., Fincher, G.B.

Revision History  

• Version 1.0: 1999-11-17
  Type: Initial release
  
• Version 1.1: 2008-04-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance
• Version 1.3: 2017-10-04
  Changes: Advisory, Refinement description
• Version 2.0: 2020-07-29
  Type: Remediation
  Reason: Carbohydrate remediation
  Changes: Advisory, Atomic model, Data collection, Database references, Derived calculations, Structure summary
• Version 2.1: 2023-12-27
  Changes: Data collection, Database references, Structure summary