Acetolactate synthase (ALS) catalyzes the first common step in the
biosynthesis of the essential amino acids isoleucine, leucine, and
valine.
Native ALS is normally inhibited by sulfonylurea herbicides.
However a naturally occurring mutation causes the production of an
altered form of ALS (designated SuRB) that is insensitive to
inhibition by sulfonylurea herbicides.
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