Crystal Structure and Functional Characterization of Acetylornithine Aminotransferase from Corynebacterium glutamicum.
J Agric Food Chem
; 71(22): 8471-8478, 2023 Jun 07.
Article
in En
| MEDLINE
| ID: mdl-37230944
ABSTRACT
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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Full text:
1
Database:
MEDLINE
Main subject:
Corynebacterium glutamicum
Language:
En
Journal:
J Agric Food Chem
Year:
2023
Type:
Article