4IIB image
Entry Detail
PDB ID:
4IIB
Keywords:
Title:
Crystal structure of beta-glucosidase 1 from Aspergillus aculeatus
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-12-20
Release Date:
2013-04-10
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.16
R-Value Work:
0.13
R-Value Observed:
0.13
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Beta-glucosidase 1
Chain IDs:A, B
Chain Length:841
Number of Molecules:2
Biological Source:Aspergillus aculeatus
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
ASN A ASN GLYCOSYLATION SITE
Primary Citation
Crystal structures of glycoside hydrolase family 3 beta-glucosidase 1 from Aspergillus aculeatus
Biochem.J. 452 211 221 (2013)
PMID: 23537284 DOI: 10.1042/BJ20130054

Abstact

GH3 (glycoside hydrolase family 3) BGLs (β-glucosidases) from filamentous fungi have been widely and commercially used for the supplementation of cellulases. AaBGL1 (Aspergillus aculeatus BGL1) belongs to the GH3 and shows high activity towards cellooligosaccharides up to high degree of polymerization. In the present study we determined the crystal structure of AaBGL1. In addition to the substrate-free structure, the structures of complexes with glucose and various inhibitors were determined. The structure of AaBGL1 is highly glycosylated with 88 monosaccharides (18 N-glycan chains) in the dimer. The largest N-glycan chain comprises ten monosaccharides and is one of the largest glycans ever observed in protein crystal structures. A prominent insertion region exists in a fibronectin type III domain, and this region extends to cover a wide surface area of the enzyme. The subsite +1 of AaBGL1 is highly hydrophobic. Three aromatic residues are present at subsite +1 and are located in short loop regions that are uniquely present in this enzyme. There is a long cleft extending from subsite +1, which appears to be suitable for binding long cellooligosaccharides. The crystal structures of AaBGL1 from the present study provide an important structural basis for the technical improvement of enzymatic cellulosic biomass conversion.

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Primary Citation of related structures