Source:http://linkedlifedata.com/resource/umls/id/C0700462
NCI: The potassium salt form of penicillin G, a broad-spectrum penicillin antibiotic. Penicillin G potassium binds to penicillin binding proteins (PBP), the enzymes that catalyze the synthesis of peptidoglycan, which is a critical component of the bacterial cell wall. This leads to the interruption of cell wall synthesis, consequently leading to bacterial cell growth inhibition and cell lysis.