8HT4 image
Entry Detail
PDB ID:
8HT4
Keywords:
Title:
Crystal structure of Acetylornithine aminotransferase complex with PLP from Corynebacterium glutamicum
Biological Source:
PDB Version:
Deposition Date:
2022-12-20
Release Date:
2024-01-17
Method Details:
Experimental Method:
Resolution:
2.51 Å
R-Value Free:
0.25
R-Value Work:
0.17
R-Value Observed:
0.17
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Acetylornithine aminotransferase
Chain IDs:A, B
Chain Length:399
Number of Molecules:2
Biological Source:Corynebacterium glutamicum ATCC 13032
Ligand Molecules
Primary Citation
Crystal Structure and Functional Characterization of Acetylornithine Aminotransferase from Corynebacterium glutamicum.
J.Agric.Food Chem. 71 8471 8478 (2023)
PMID: 37230944 DOI: 10.1021/acs.jafc.3c00659

Abstact

The amino acids l-arginine and l-ornithine are widely used in animal feed and as health supplements and pharmaceutical compounds. In arginine biosynthesis, acetylornithine aminotransferase (AcOAT) uses pyridoxal-5'-phosphate (PLP) as a cofactor for amino group transfer. Here, we determined the crystal structures of the apo and PLP complex forms of AcOAT from Corynebacterium glutamicum (CgAcOAT). Our structural observations revealed that CgAcOAT undergoes an order-to-disorder conformational change upon binding with PLP. Additionally, we observed that unlike other AcOATs, CgAcOAT exists as a tetramer. Subsequently, we identified the key residues involved in PLP and substrate binding based on structural analysis and site-directed mutagenesis. This study might provide structural insights on CgAcOAT, which can be utilized for the development of improved l-arginine production enzymes.

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