4JE5 : Crystal structure of the aromatic aminotransferase Aro8, a putative alpha-aminoadipate aminotransferase in Saccharomyces cerevisiae

  • Stacie L. Bulfer (Contributor)
  • Joseph S. Brunzelle (Contributor)
  • Raymond C. Trievel (Contributor)



Experimental Technique/Method:X-RAY DIFFRACTION
Release Date:2013-09-11
Deposition Date:2013-02-26
Revision Date:2013-10-16#2013-10-23#2017-11-15
Molecular Weight:228431.08
Macromolecule Type:Protein
Residue Count:2012
Atom Site Count:15842

α-Aminoadipate aminotransferase (AAA-AT) catalyzes the amination of 2-oxoadipate to α-aminoadipate in the fourth step of the α-aminoadipate pathway of lysine biosynthesis in fungi. The aromatic aminotransferase Aro8 has recently been identified as an AAA-AT in Saccharomyces cerevisiae. This enzyme displays broad substrate selectivity, utilizing several amino acids and 2-oxo acids as substrates. Here we report the 1.91Å resolution crystal structure of Aro8 and compare it to AAA-AT LysN from Thermus thermophilus and human kynurenine aminotransferase II. Inspection of the active site of Aro8 reveals asymmetric cofactor binding with lysine-pyridoxal-5-phosphate bound within the active site of one subunit in the Aro8 homodimer and pyridoxamine phosphate and a HEPES molecule bound to the other subunit. The HEPES buffer molecule binds within the substrate-binding site of Aro8, yielding insights into the mechanism by which it recognizes multiple substrates and how this recognition differs from other AAA-AT/kynurenine aminotransferases.
Date made available2013

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