Abstract

A variety of herbicides act by inhibiting the branched chain amino‐acid biosynthetic enzyme, acetolactate synthase (EC 4.1.3.18). The initial consequences of this event are 2‐ketoacid accumulation and amino‐acid starvation. Recent studies demonstrate that 2‐ketoacid imbalances play a significant role in the action of these herbicides; such imbalances may also be important in certain inborn errors of human metabolism.