This enzyme has 2 sites of interest. The first is the catalytic site from which the enzyme initiates the production process of branched-chain amino acids (Val, Leu, Ile). The second is the herbicide binding site and this is connected by a transport channel to the former. The action of the herbicide is to block this channel from being used, stopping the transport of pyruvate or 2ketobyruvate to be used at the catalytic site. There is no evidence that the point mutation P197S or attachment of CS causes a conformational change to Arabidopsis Thaliana AHAS in comparing x-ray structures uninhibited and inhibited, nor also in computational energy minimization of Soybean S197 AHAS and in complex with CS; the 2 share much of their sequences and are visually indistinguishable in the backbone structure.