Structural and functional evaluation of three well-conserved serine residues in tobacco acetohydroxyacid synthase.


The first step in the common pathway for the biosynthesis of branched-chain amino acids (BCAAs) is catalyzed by acetohydroxyacid synthase (AHAS). The roles of three well-conserved serine residues (S167, S506, and S539) in tobacco AHAS were determined using site-directed mutagenesis. The mutations S167F and S506F were found to be inactive and abolished the… (More)
DOI: 10.1016/j.biochi.2009.09.010


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