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Mode of Actin for Antimicrobial Drugs
Describes the mode of action of the antimicrobial drugs on bacteria.
19
Microbiology
Undergraduate 2
04/13/2014

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Term
Penicillin
Definition
Prevent cross-linkage of NAM and NAG
Term
Bacitracin
Definition
Interferes with transportation of peptidoglycan components across inner plasma membrane.
Term
Cephalosporins
Definition
Prevent cross-linkage of NAM and NAG.
Term
Vancomycin
Definition
Blocks attachment of 4 amino acids to NAM sugars.
Term
Isoniazid
Definition
Inhibits synthesis of mycolic acid.
Term
Aminoglycoside
Definition
Binds to 30s ribosomal subunit and causes it to change shape. mRNA is incorrectly read and nonsense protein synthesized.
Term
Tetracycline
Definition
Binds to 30s robomosal subunit and blocks binding of mRNA to tRNA at the A site. Elongation and translation stops.
Term
Chloramphenicol
Definition
Binds to 50s ribosomal sununit and inhibits formaiton of peptide bonds between amino acids. Elongation and translocation stops.
Term
Macrolides
Definition
Binds to 50s ribosomal subunit and prevents translocation of tRNA's between P and A sites. Elongation and translocation stops.
Term
Oxazolidnones
Definition
Binds to 50s ribosomal subunit and inhibits joining of ribosomal subunits. No functional 70s ribosome produced.
Term
Fluoroquinolones
Definition
Inhibits DNA gyrase so bacterial chromosome remains supercoiled. Prevents DNA replication.
Term
Polymyxins
Definition
Detergent-like effect. Disrupts phosopholipid bilayer.
Term
Sulfonamides
Definition
Pteridine synthetase inhibition. Blocks PABA to dihydrofolic acid.
Term
Trimethoprim
Definition
Dihydrofolate reductase inhibition. Blocks dihydrofolic acid to tetrahydrofolic acid.
Term
Amphotericin B
Definition
Binds to ergosterol in cell membrane and creates pores. Nutrients leave through pores and fungi dies.
Term
Imidazole
Definition
Inhibits metabolic pathway so correct form of ergosterol in not synthesized.
Term
Echinocandins
Definition
Interferes with enzyme that attaches to B-glucan. B-glucans not linked to fungal cell wall, so cell is more susceptible to lysis.
Term
Chloroquine
Definition
Prevents conversion of toxic heme to nontoxic heme. Toxic heme accumulates and kills protozoan.
Term
Fuzeon
Definition
(Blocks HIV entry into cell) Inhibits activity of reverse transcriptase. HIV cannot synthesize the nucleic acids it requires for viral replication.
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