Clavaminic acid synthetase (CAS) -like; CAS is a trifunctional Fe(II)/ 2-oxoglutarate (2OG) oxygenase carrying out three reactions in the biosynthesis of clavulanic acid, an inhibitor of class A serine beta-lactamases. In general, Fe(II)-2OG oxygenases catalyze a hydroxylation reaction, which leads to the incorporation of an oxygen atom from dioxygen into a hydroxyl group and conversion of 2OG to succinate and CO2