7EAP image
Entry Detail
PDB ID:
7EAP
Keywords:
Title:
Crystal structure of IpeA-XXXG complex
Biological Source:
PDB Version:
Deposition Date:
2021-03-08
Release Date:
2022-03-16
Method Details:
Experimental Method:
Resolution:
1.42 Å
R-Value Free:
0.14
R-Value Work:
0.11
R-Value Observed:
0.11
Space Group:
P 31 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Fn3_like domain-containing protein
Chain IDs:A
Chain Length:765
Number of Molecules:1
Biological Source:Aspergillus oryzae (strain ATCC 42149 / RIB 40)
Primary Citation
Structural basis for the catalytic mechanism of the glycoside hydrolase family 3 isoprimeverose-producing oligoxyloglucan hydrolase from Aspergillus oryzae.
Febs Lett. 596 1944 1954 (2022)
PMID: 35717558 DOI: 10.1002/1873-3468.14427

Abstact

Aspergillus oryzae isoprimeverose-producing oligoxyloglucan hydrolase (IpeA) releases isoprimeverose units (α-d-xylopyranosyl-(1→6)-d-glucose) from the non-reducing end of xyloglucan oligosaccharides and belongs to glycoside hydrolase family 3. In this paper, we report the X-ray crystal structure of the IpeA complexed with a xyloglucan oligosaccharide, (XXXG: Glc4 Xyl3). Trp515 of IpeA plays a critical role in XXXG recognition at positive subsites. In addition, docking simulation of IpeA-XXXG suggested that two Tyr residues (Tyr268 and Tyr445) are involved in the catalytic reaction mechanism of IpeA. Tyr268 plays an important role in product turnover, whereas Tyr445 stabilizes the acid/base Glu524 residue, which serves as a proton donor. Our findings indicate that the substrate recognition machinery of IpeA is specifically adapted to xyloglucan oligosaccharides.

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