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Antibiotics
Antibiotics
49
Biology
Graduate
09/09/2009

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Term
Ciprofloxacin
Definition
inhibits Topo II and thus stops DNA transcription since DNA becomes too positively supercoiled; bacteriocidal
Term
Quinolones
Definition
inhibits Topo II and thus stops DNA transcription since DNA becomes too positively supercoiled
Term
Nalidixic Acid
Definition
inhibits Topo II and thus stops DNA transcription since DNA becomes too positively supercoiled
Term
trimethoprim
Definition
inhibits dNTP synthesis by inhibiting dihydrofolate reductase thus reducing the tetrahydrofolate pool
Term
sulfonamide
Definition
PABA analog and so inhibits folic acid synthesis; used in conjunction with trimethoprim; used to treat Nocardia infection
Term
Penicillin
Definition
β-lactam antibiotic; D-ala-D-ala analog; targets cell wall synthesis by inhibiting peptidoglycan cross-linking (transpeptidation) outside the bacterium; bacteriocidal
Term
vancomycin
Definition
inhibits incorporation of NAG and NAM subunits into growing peptidoglycan chain by binding to d-alanine-d-alanyl side chain (inhibits transglycosylase); also inhibits transpeptidation (transpeptidase); ONLY for gram positive bacteria; bacteriocidal
Term
bacitracin
Definition
inhibits recylcing of BPP (lipid carrier) which carries subunits of bacterial cell wall through cellular membrane to periplasm by inhibiting dephosphorylation and so BP can't pick up the subunits
Term
Fosphomycin
Definition
analog of PEP; acts as mimic of substrate for enzyme reaction from NAG to NAM synthesis and so blocks cell wall synthesis; works in cytosol
Term
Cycloserine
Definition
mimics shape of D-alanine and so competes with enzyme alanine racemase which converts L-alanine to D-alanine and competes for D-ala-D-ala synthetase which makes the D-ala-D-ala subunit of the peptidoglycan chain; works in the cytosol
Term
isoniazid
Definition
inhibits cell wall synthesis by targeting mycolic acid; used for TB
Term
ethambutol
Definition
inhibits cell wall synthesis; used for TB
Term
pyrazinamide
Definition
inhibits fatty acid synthesis; used for TB
Term
chloramphenicol
Definition
inhibits 50S ribosomal subunit; bacteriostatic; NOT used in combo with bacteriocidal drugs; useful in meningitis because accumulates in CSF
Term
para-aminosalicylic acid
Definition
inhibits folate synthesis; used for TB
Term
ethionamide
Definition
inhibits protein synthesis; used for TB
Term
kanamycin
Definition
inhibits protein synthesis; used for TB
Term
Rifampin
Definition
RNA polymerase inhibitor; used for Mycobacterium leprae infection; can be used for TB treatment; prophylactic treatment for meningitis
Term
cephalosporin
Definition
β-lactam antibiotic; inhibits transpeptidation
Term
carbapenems
Definition
β-lactam antibiotic; inhibits transpeptidation
Term
monobactams
Definition
β-lactam antibiotic; inhibits transpeptidation
Term
ampicillin
Definition
penicillin derivative
Term
methicillin
Definition
penicillin derivative
Term
piperacillin
Definition
penicillin derivative
Term
Cefazolin
Definition
1st generation cephalosporin; β-lactam antibiotic
Term
Cefaclor
Definition
2nd generation cephalosporin; β-lactam antibiotic
Term
Ceftriaxone
Definition
3rd generation cephalosporin; β-lactam antibiotic
Term
Amoxicillin
Definition
pencillin derivative;
Term
clavulanic acid
Definition
β-lactamase inhibitor; comibined with penicillin or other penicillin derivatives
Term
sulbactam
Definition
β-lactamase inhibitor; comibined with penicillin or other penicillin derivatives
Term
tazobactam
Definition
β-lactamase inhibitor; comibined with penicillin or other penicillin derivatives
Term
Polymyxin B
Definition
antibiotic targeting membranes by altering structure and making it more permeable thus causing lysis due to osmotic pressure; used for resistant gram negative bacteria; problem because eukaryotic cells also have membranes
Term
Streptomycin
Definition
aminoglycoside antibiotic; inhibits 30S ribosomal subunit (inhibits protein synthesis); extremely bacteriocidal once in cell (not reversible); low therapeutic value; used for TB treatment; bacteriocidal
Term
Tobramycin
Definition
aminocyclotol antibiotic; inhibits 30S ribosomal subunit (inhibits protein synthesis)
Term
tetracycline
Definition
inhibits 30S ribosomal subunit; effective only against rapidly dividing cells; used to treat INTRACELLULAR bacterial infections; bacteriostatic
Term
doxycycline
Definition
tetracycline antibiotic that targets 30S ribosomal subunit; bacteriostatic
Term
Bacteriocidal Drugs
Definition
vancomycin; penicillins; cephalosporins; ciproflaxin; streptomycin (aminoglycosides)
Term
Bacteriostatic Drugs
Definition
sulphonamides; tetracyclines; chloramphenicol; lincamycin; clindamycin
Term
erythomycin
Definition
macrolide; inhibits 50S ribosomal subunit
Term
azithromycin
Definition
macrolide; inhibits 50S ribosomal subunit; broader spectrum than erythomycin
Term
clindamycin
Definition
lincosamide antibiotic; inhibits the 50S ribosomal subunit
Term
Levofloxacin
Definition
Topo II (Gyrase) inhibitor
Term
Moxifloxacin
Definition
Topo II (Gyrase) inhibitor
Term
Linezolid (zyvox)
Definition
prevents formation of fmet-tRNA:mRNA:30S subunit ternary complex, preventing initiation of translation (protein synthesis)
Term
Streptogramin (Synercid)
Definition
combo of Quinupristin (competes with macrolides for 50S binding) and Dalfopristin (binds to 50S ribosomal unit and prevents elongation)
Term
Daptomycin
Definition
target is bacterial membrane; used for skin infections; used for gram positive aerobes that are resistant to other antibiotics
Term
Polymixin B
Definition
targets plasma membrane; maybe problem because our cells also have plasma membranes
Term
inhibitors of the 30S ribosomal subunit
Definition
aminoglycosides (streptomycin) and tetracyclines (tetracycline & doxycycline)
Term
inhibitors of 50S ribosomal subunit
Definition
chloramphenicol, macrolides (erythromycin & azithromycin) and linosamide (clindamycin)
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