1ST8 image
Deposition Date 2004-03-25
Release Date 2005-03-01
Last Version Date 2024-10-30
Entry Detail
PDB ID:
1ST8
Keywords:
HYDROLASE
Title:
Crystal structure of fructan 1-exohydrolase IIa from Cichorium intybus
Biological Source:
Source Organism:
Cichorium intybus (Taxon ID: 13427)
Host Organism:
Pichia pastoris
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.35 Å
R-Value Free:
0.2
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
P 41 21 2
1ST8 validation report
Macromolecular Entities
Protein Blast
Polymer Type:polypeptide(L)
Molecule:fructan 1-exohydrolase IIa
Chain IDs:A
Chain Length:543
Number of Molecules:1
Biological Source:Cichorium intybus
UniProt ID:Q93X60 Pfam ID:PF00251, PF08244
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Ligand Molecules
GOL
Primary Citation
X-ray diffraction structure of a plant glycosyl hydrolase family 32 protein: fructan 1-exohydrolase IIa of Cichorium intybus.
Plant J. 41 400 411 (2005)
PMID: 15659099 DOI: 10.1111/j.1365-313X.2004.02304.x

Abstact

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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Disease

Primary Citation of related structures
1ST8