5IWQ: Crystal Structure Of Aspartate Aminotransferase (aspat) From Corynebacterium Glutamicum Atcc 13032

Citation:
Abstract
Aspartate aminotransferase from Corynebacterium glutamicum (CgAspAT) is a PLP-dependent enzyme that catalyzes the production of L-aspartate and alpha-ketoglutarate from L-glutamate and oxaloacetate in L-lysine biosynthesis. In order to understand the molecular mechanism of CgAspAT and compare it with those of other aspartate aminotransferases (AspATs) from the aminotransferase class I, we determined the crystal structure of CgAspAT. CgAspAT functions as a dimer, and the CgAspAT monomer consists of two domains, the core domain and the auxiliary domain. The PLP cofactor is found to be bound to CgAspAT and stabilized through unique residues. In our current structure, a citrate molecule is bound at the active site of one molecule and mimics binding of the glutamate substrate. The residues involved in binding of the PLP cofactor and the glutamate substrate were confirmed by site-directed mutagenesis. Interestingly, compared with other AspATs from aminotransferase subgroup Ia and Ib, CgAspAT exhibited unique binding sites for both cofactor and substrate; moreover, it was found to have unusual structural features in the auxiliary domain. Based on these structural differences, we propose that CgAspAT does not belong to either subgroup Ia or Ib, and can be categorized into a subgroup Ic. The phylogenetic tree and RMSD analysis also indicates that CgAspAT is located in an independent AspAT subgroup.
PDB ID: 5IWQDownload
MMDB ID: 140794
PDB Deposition Date: 2016/3/22
Updated in MMDB: 2016/07
Experimental Method:
x-ray diffraction
Resolution: 2  Å
Source Organism:
Similar Structures:
Biological Unit for 5IWQ: dimeric; determined by author and by software (PISA)
Molecular Components in 5IWQ
Label Count Molecule
Proteins (2 molecules)
2
Aspartate Aminotransferase
Molecule annotation
Chemicals (13 molecules)
1
2
2
10
3
1
* Click molecule labels to explore molecular sequence information.

Citing MMDB
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