Cephalosporin mechanism of action may include:

Cephalosporins are beta-lactam antibiotics that bactericidally inhibit bacterial cell wall synthesis. Their structural similarity to the D-alanyl-D-alanine peptide terminus allows them to competitively bind to penicillin-binding proteins (PBPs), specifically transpeptidases. Transpeptidases are essential enzymes responsible for cross-linking the peptidoglycan chains that maintain the structural integrity and rigidity of the bacterial cell wall. By inhibiting transpeptidase activity and activation of autolytic enzymes within the cell wall, cephalosporins prevent final peptidoglycan cross-linking. This weakens the cell wall, causing osmotic instability, cell lysis, and ultimate bacterial death. Because eukaryotic human cells lack a peptidoglycan cell wall, this targeted mechanism provides selective toxicity against susceptible Gram-positive and Gram-negative bacterial species during active cell growth.

Option A: Protein synthesis inhibition is the mechanism of action for aminoglycosides, tetracyclines, and macrolides, not cephalosporin beta-lactam antibiotics.

Option C: Inhibition of essential metabolite synthesis (such as folate synthesis) is the mechanism of action of sulfonamides and trimethoprim.

Option D: Altering cell membrane permeability and disruption is characteristic of lipopeptide and polypeptide antibiotics like daptomycin and polymyxins.

Option E: Inhibition of genetic information translation involves ribosomal targeting antibiotics like aminoglycosides or oxazolidinones, rather than cell wall-active agents.

1. Goodman & Gilman's: The Pharmacological Basis of Therapeutics, 13th Ed., Chapter 56: Penicillins, Cephalosporins, and Other β-Lactam Antibiotics, pp. 1023-1038.

2. Foye's Principles of Medicinal Chemistry, 7th Ed., Chapter 33: β-Lactam Antibiotics, pp. 1045-1060.

3. MIT OpenCourseWare, Health Sciences and Technology, HST.151: Principles of Pharmacology, "Cell Wall Inhibitors".