Why can't penicillin and lysozyme kill Gram-negative bacteria?
Apr 04, 2023
Source: Cainiu Health
Dr. Yang Shuwen
Introduction
Since penicillin and lysozyme exert their bactericidal effects by disrupting peptidoglycan and inhibiting cell wall formation, they are ineffective against Gram-negative bacteria due to the low peptidoglycan content in their cell walls. In addition, Gram-negative bacteria can be treated with medications such as mezlocillin tablets or ceftriaxone sodium tablets, to which these bacteria are relatively sensitive.
Penicillin and lysozyme achieve their bactericidal effects by disrupting peptidoglycan and inhibiting cell wall formation. However, Gram-negative bacteria contain too little peptidoglycan in their cell walls, making them resistant to these agents.
Penicillin is an antibacterial drug, and lysozyme is a glycoside hydrolase. Both substances target the peptidoglycan layer of bacterial cell walls, damaging the structural integrity of the bacterial envelope. Because the osmotic pressure inside bacterial cells is relatively high and the cytoplasmic membrane is fragile, penicillin and lysozyme can cause bacteria to swell and rupture, effectively killing them. Penicillin and lysozyme are highly effective against Gram-positive bacteria. However, due to their low peptidoglycan content, Gram-negative bacteria are less susceptible to these agents, so penicillin and lysozyme cannot completely eliminate Gram-negative bacteria.
In addition, Gram-negative bacteria can be treated with medications such as mezlocillin tablets or ceftriaxone sodium tablets. These drugs are more effective against Gram-negative bacteria and can eradicate the infection. However, these medications should only be used under the guidance of a physician. Self-medication without medical supervision should be avoided to prevent potential harm to the body.
