Has a broad substrate profile, hydrolyzes amoxicillin, ticarcillin, cephalothin, ceftazidime, cefotaxime, and aztreonam, but not imipenem or cephamycins. a beta-lactam + H2O = a substituted beta-amino acid Inhibited by clavulanic acid, sulbactam, tazobactam, and imipenem. Belongs to the class-D beta-lactamase family.