2-oxoglutarate + deoxyamidinoproclavaminate + O2 = amidinoproclavaminate + CO2 + succinate 2-oxoglutarate + O2 + proclavaminate = CO2 + dihydroclavaminate + H2O + succinate 2-oxoglutarate + dihydroclavaminate + O2 = clavaminate + CO2 + H2O + succinate Binds 1 Fe(2+) ion per subunit. Antibiotic biosynthesis; clavulanate biosynthesis; clavulanate from D-glyceraldehyde 3-phosphate and L-arginine: step 3/8. Antibiotic biosynthesis; clavulanate biosynthesis; clavulanate from D-glyceraldehyde 3-phosphate and L-arginine: step 5/8. Antibiotic biosynthesis; clavulanate biosynthesis; clavulanate from D-glyceraldehyde 3-phosphate and L-arginine: step 6/8. Belongs to the clavaminate synthase family.