C-S lyase involved in glucosinolate biosynthesis. Converts S-(alkylacetohydroximoyl)-L-cysteine to thiohydroximate. Functions in auxin homeostasis. Probably required for glucosinolate activation in response to pathogens. Hyperproliferation of lateral roots. Small and epinastic cotyledons and true leaves. Rare floral organs and sterile flowers. High levels of endogenous free and conjugated auxin. Belongs to the class-I pyridoxal-phosphate-dependent aminotransferase family.