Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 62.5 kDa 
• Atom Count: 4,696 
• Modelled Residue Count: 537 
• Deposited Residue Count: 543 
• Unique protein chains: 1

 1ST8

Crystal structure of fructan 1-exohydrolase IIa from Cichorium intybus

• PDB DOI: 10.2210/pdb1ST8/pdb

• Classification: HYDROLASE
• Organism(s): Cichorium intybus
• Expression System: Komagataella pastoris
• Mutation(s): No 


• Deposited: 2004-03-25 Released: 2005-03-01 
• Deposition Author(s): Verhaest, M., Van den Ende, W., De Ranter, C.J., Van Laere, A., Rabijns, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.35 Å
• R-Value Free: 0.200 
• R-Value Work: 0.183 
• R-Value Observed: 0.183 

Literature

X-ray diffraction structure of a plant glycosyl hydrolase family 32 protein: fructan 1-exohydrolase IIa of Cichorium intybus.

Verhaest, M., van den Ende, W., Roy, K.L., De Ranter, C.J., van Laere, A., Rabijns, A.

(2005) Plant J 41: 400-411

• PubMed: 15659099 
• DOI: 10.1111/j.1365-313X.2004.02304.x
• Primary Citation of Related Structures:  
  1ST8


• PubMed Abstract: 
  

Fructan 1-exohydrolase, an enzyme involved in fructan degradation, belongs to the glycosyl hydrolase family 32. The structure of isoenzyme 1-FEH IIa from Cichorium intybus is described at a resolution of 2.35 A. The structure consists of an N-terminal fivefold beta-propeller domain connected to two C-terminal beta-sheets. The putative active site is located entirely in the beta-propeller domain and is formed by amino acids which are highly conserved within glycosyl hydrolase family 32. The fructan-binding site is thought to be in the cleft formed between the two domains. The 1-FEH IIa structure is compared with the structures of two homologous but functionally different enzymes: a levansucrase from Bacillus subtilis (glycosyl hydrolase family 68) and an invertase from Thermotoga maritima (glycosyl hydrolase family 32).

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Organizational Affiliation: 

Laboratorium voor Analytische Chemie en Medicinale Fysicochemie, Faculteit Farmaceutische Wetenschappen, K.U. Leuven, E. Van Evenstraat 4, B-3000 Leuven, Belgium.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
fructan 1-exohydrolase IIa	A	543	Cichorium intybus	Mutation(s): 0  Gene Names: 1-feh IIa EC: 3.2.1.80
UniProt
Find proteins for Q93X60 (Cichorium intybus) Explore Q93X60  Go to UniProtKB:  Q93X60

Oligosaccharides

Help

Entity ID: 2
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
alpha-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	B	3		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G62182OO GlyCosmos:  G62182OO GlyGen:  G62182OO

Entity ID: 3
Molecule	Chains	Chain Length	2D Diagram	Glycosylation
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose	C	2		N-Glycosylation
Glycosylation Resources
GlyTouCan:  G42666HT GlyCosmos:  G42666HT GlyGen:  G42666HT

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
GOL	D [auth A], E [auth A], F [auth A], G [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.35 Å
• R-Value Free: 0.200 
• R-Value Work: 0.183 
• R-Value Observed: 0.183 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 139.83	α = 90
b = 139.83	β = 90
c = 181.94	γ = 90

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Released Date: 2005-03-01 
Deposition Author(s): Verhaest, M., Van den Ende, W., De Ranter, C.J., Van Laere, A., Rabijns, A.

Revision History  

• Version 1.0: 2005-03-01
  Type: Initial release
  
• Version 1.1: 2008-04-29
  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: Advisory, Atomic model, Data collection, Derived calculations, Non-polymer description, Structure summary