Penicillinase Hydrolyzes beta-lactams antibiotics. Rates of hydrolysis relative to benzylpenicillin =100: ampicillin = 27, carbenicillin = 25, cloxacillin = 0, cephaloridine = 4. MRFTATVLSRVATGLALGLSMATASLAETPVEALSETVARIEEQLGARVGLSLMETGTGWSWSHREDELFLMNSTVKVPVCGAILARWDAGRLSLSDALPVRKADLVPYAPVTETRVGGNMTLDELCLAAIDMSDNVAANILIGHLGGPEAVTQFFRSVGDPTSRLDRIEPKLNDFASGDERDTTSPAAMSETLRALLLGDVLSPEARGKLAEWMRHGGVTGALLRAEAEDAWLILDKSGSGSHTRNLVAVIQPEGGAPWIATMFISDTDAEFEVRNEALKDLGRAVVAVVRE 293 Beta-lactamase BLAC_RHOCA