Structural highlights
Function
[LYSN_THET2] Catalyzes the transfer of an amino group between 2-oxoadipate (2-OA) and glutamate (Glu) to yield alpha-aminodipate (AAA). It can also transaminate glutamate, leucine, and aromatic amino acids. It also contributes in the biosynthesis of other amino acids such as leucine.[1]
Evolutionary Conservation
Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.
Publication Abstract from PubMed
To clarify the mechanism for substrate recognition of alpha-aminoadipate aminotransferase (AAA-AT) from Thermus thermophilus, the crystal structure of AAA-AT complexed with N-(5'-phosphopyridoxyl)-l-glutamate (PPE) was determined at 1.67 A resolution. The crystal structure revealed that PPE is recognized by amino acid residues the same as those seen in N-(5'-phosphopyridoxyl)-l-alpha-aminoadipate (PPA) recognition; however, to bind the gamma-carboxyl group of Glu at a fixed position, the Calpha atom of the Glu moiety moves 0.80 A toward the gamma-carboxyl group in the PPE complex. Markedly decreased activity for Asp can be explained by the shortness of the aspartyl side chain to be recognized by Arg23 and further dislocation of the Calpha atom of bound Asp. Site-directed mutagenesis revealed that Arg23 has dual functions for reaction, (i) recognition of gamma (delta)-carboxyl group of Glu (AAA) and (ii) rearrangement of alpha2 helix by changing the interacting partners to place the hydrophobic substrate at the suitable position.
Dual roles of a conserved pair, Arg23 and Ser20, in recognition of multiple substrates in alpha-aminoadipate aminotransferase from Thermus thermophilus.,Ouchi T, Tomita T, Miyagawa T, Kuzuyama T, Nishiyama M Biochem Biophys Res Commun. 2009 Oct 9;388(1):21-7. Epub 2009 Jul 24. PMID:19632206[2]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Miyazaki T, Miyazaki J, Yamane H, Nishiyama M. alpha-Aminoadipate aminotransferase from an extremely thermophilic bacterium, Thermus thermophilus. Microbiology. 2004 Jul;150(Pt 7):2327-34. PMID:15256574 doi:10.1099/mic.0.27037-0
- ↑ Ouchi T, Tomita T, Miyagawa T, Kuzuyama T, Nishiyama M. Dual roles of a conserved pair, Arg23 and Ser20, in recognition of multiple substrates in alpha-aminoadipate aminotransferase from Thermus thermophilus. Biochem Biophys Res Commun. 2009 Oct 9;388(1):21-7. Epub 2009 Jul 24. PMID:19632206 doi:10.1016/j.bbrc.2009.07.096
