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Acetohydroxyacid synthase (AHAS; EC 4.1.3.18) contains catalytic and regulatory subunits, the latter being required for sensitivity to feedback regulation by leucine, valine and isoleucine. The regulatory subunit of Arabidopsis thaliana AHAS possesses a sequence repeat and we have suggested previously that one repeat binds leucine while the second binds valine or isoleucine, with synergy between the...
Acetolactate synthase catalyses the first step in branched-chain amino acid biosynthesis. The bacterial enzyme contains two large and two small subunits but there is only limited and circumstantial evidence for a small subunit in the eukaryotic enzyme. Here this evidence is summarised and protein sequences of two putative eukaryotic small subunits, from a yeast and a red alga, are presented.
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