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antimicrobials
cell wall synthesis inhibs/protein synthesis inhibs/nucleic acid synthesis inhibs/cell membrane disruption
16
Microbiology
Undergraduate 1
04/01/2013

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Cards

Term
cell wall synthesis inhibs
Definition

b lactams e.g. penicilin/cephalosporin

glycopeptides e.g. vancomycin

Term
b lactams
Definition
bind to PBPs = inhibit cross linking of peptidoglycans
Term
glycopeptides
Definition
bind to d-alanyl-d-alanine portion of pentapeptide required for peptidoglycan formation = no cross linking
Term
protein synthesis inhibitors
Definition

aminoglycosides

tetracyclines

chloramophenicol

macrolides

linezolid

Term
aminoglycosides
Definition
bind to 30s on ribo = non functioning initiation complexes
Term
tetracyclines
Definition
binds to 30s ribo = prevent elongation of peptide
Term
chloramphenicol
Definition
binds to 50s ribo =inhibits peptidyl transferase
Term
macrolides
Definition

inhibits formation of 50s ribo unit.

interacts with peptidyl transferase = blocks polypeptide exit tunnel = peptide dissociates from ribo during translocation

 

(ALSO ACTS ON HUMAN 50S RIBO UNIT = TOXICITY)

Term
LINEZOLID
Definition
binds to 23s ribosomal rna of 50s unit = prevents formation of initiation complex
Term
nucleic acid synthesis inhibs
Definition

sulphonamides

trimethoprim

quinolones

rifampacin

Term
sulphonamides
Definition
blocks synthesis of tetrahydrofolic acid (precursor to adenine, guanine, thymine)
Term
trimethoprim
Definition
inhibit dihydrofolate reductase = no purines/pyramidines/AAs made
Term
quinolones
Definition

inhibits DNA gyrase - for g -ve

inhibits topoisomerase IV - for g +ve (mainly s.aureus and cocc)

Term
cell membrane disruption
Definition

daptomycin

polymyxins

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