Three-dimensional Structure of YaaE from Bacillus subtilis, a Glutaminase Implicated in Pyridoxal-5′-phosphate Biosynthesis*

The structure of YaaE from Bacillus subtilis was determined at 2.5-Å resolution. YaaE is a member of the triad glutamine aminotransferase family and functions in a recently identified alternate pathway for the biosynthesis of vitamin B6. Proposed active residues include conserved Cys-79, His-170, and Glu-172. YaaE shows similarity to HisH, a glutaminase involved in histidine biosynthesis. YaaD associates with YaaE. A homology model of this protein was constructed. YaaD is predicted to be a (β/α)8 barrel on the basis of sequence comparisons. The predicted active site includes highly conserved residues 211–216 and 233–235. Finally, a homology model of a putative YaaD-YaaE complex was prepared using the structure of HisH-F as a model. This model predicts that the ammonia molecule generated by YaaE is channeled through the center of the YaaD barrel to the putative YaaD active site.

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