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Acetohydroxy-acid synthases (AHAS) of two mutant strains Streptomyces cinnamonensis ACB-NLR-2 and BVR-18 were chosen for this study for their apparent activation by valine, which regularly acts as an allosteric inhibitor. Sequencing the ilvB genes coding for the AHAS catalytic subunit revealed two distant changes in the mutants, ΔQ217 and E139A, respectively. Homology modeling was used to propose...
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