Principles of Antimicrobial Chemotherapy Study Guide
This guide covers the fundamental principles of antimicrobial chemotherapy, exploring how drugs are used to combat infections. It details the characteristics of an ideal antimicrobial agent, various classifications of these drugs, and methods used to test their effectiveness against microbes. The guide also addresses the critical issue of antimicrobial resistance and the mechanisms by which drugs target and inhibit microbial growth. Finally, it touches upon emerging strategies for developing new
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Mechanisms of Gene Expression and Replication
Mechanisms of Gene Expression and Replication
This chapter studies mechanisms of gene regulation, expression, and replication in living cells including the central dogma of molecular biology.
- RNA Transcription
- DNA Replication
- Protein Synthesis (Translation)
- Mutations
- Central Dogma of Molecular Biology
- Genotype vs Phenotype
- Gene Expression
- Genome
- Semiconservative DNA replication
Mechanisms of DNA Replication
DNA replication is the process by which the DNA molecule is duplicated through semiconservative replication using complementary base pairing.
- Semiconservative replication
- Complementary base pairing
- DNA replication in bacteria
- Helicase
- Single-Stranded Binding Proteins
- Primase
- Topoisomerase
- DNA Polymerase I
- Ligase
- Leading strand
- Lagging strand
- Okazaki fragments
- Origin of replication
Transcription in Prokaryotes and Eukaryotes
The process of transcription involves the flow of genetic information from DNA to RNA through initiation, elongation, and termination.
- Central Dogma of Molecular Biology
- Transcription
- RNA polymerase
- Promoter
- Initiation
- Elongation
- Termination
- Prokaryotic transcription
- Eukaryotic transcription
- 5' cap
- 3' poly-A tail
- Introns
- Exons
- Splicing
The Mechanism of Protein Synthesis
Translation involves the flow of genetic information from DNA to protein through initiation, elongation, and termination.
- Central Dogma of Molecular Biology
- Translation
- Genetic Code
- Amino acid
- Start codon
- Stop codons
- Ribosome
- Initiation
- Elongation
- Termination
- Prokaryotic vs Eukaryotic translation
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Understanding Mutations and DNA Repair
A permanent, heritable change in the DNA sequence can result in mutations that affect phenotype through point mutations or frameshift mutations.
- Mutation
- Point mutations
- Silent mutation
- Missense mutation
- Nonsense mutation
- Insertion/deletion mutations
- Frameshift mutation
- Spontaneous mutations
- Induced mutations
- Mutagens
- Chemical mutagens
- Ionizing radiation
- Non-ionizing radiation
- Thymine dimers
- DNA repair
- Proofreading
- Mismatch repair
- Nucleotide excision repair
- Dark repair
- Direct repair
Genetic Diversity and Horizontal Gene Transfer
Horizontal gene transfer increases genetic diversity in asexually-reproducing organisms through transformation, transduction, and conjugation.
- Genetic diversity
- Asexual reproduction
- Mutations
- Horizontal gene transfer
- Transformation
- Transduction
- Conjugation
- Streptococcus pneumoniae
- DNA as hereditary material
- Genotype
- Phenotype
- Bacteriophage
- Conjugation pilus
- F plasmid
- Virulence factors
- Antibiotic resistance
Principles and Mechanisms of Antimicrobial Chemotherapy
Principles of Antimicrobial Chemotherapy
The use of drugs to control infection through antimicrobial chemotherapy and the identification of infectious agents.
- Antimicrobial chemotherapy
- Characteristics of ideal antimicrobial drugs
- Prophylaxis
- Antibiotics
- Semisynthetic drugs
- Synthetic drugs
- Narrow-spectrum antimicrobials
- Broad-spectrum antimicrobials
- Drug susceptibility testing
- Zone of inhibition
- Antimicrobial resistance
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Goals and Mechanisms of Antimicrobial Drugs
Antimicrobial drugs aim to disrupt cell processes or structures of bacteria, fungi, or protozoa through selective toxicity.
- Selective toxicity
- Inhibition of cell wall synthesis
- Inhibition of nucleic acid structure and function
- Inhibition of the ribosome in protein synthesis
- Interference with cytoplasmic membrane structure or function
- Inhibition of folic acid synthesis
- Broad-spectrum drugs
- Narrow-spectrum drugs
- Penicillins
- Cephalosporins
- Carbapenems
- Aminoglycosides
- Tetracyclines
- Macrolides
- Sulfonamides
- Fluoroquinolones
- Polymyxins
Agents Used to Treat Microbial Infections
This content discusses various agents used to treat fungal, antimalarial, antiprotozoal, helminthic, and viral infections, including the challenges of treating bacteria in biofilms.
- Bacteria in biofilms
- Biofilm treatment strategies
- Agents to treat fungal infections
- Macrolide polyenes
- Azoles
- Echinocandins
- Allylamines
- Antimalarial drugs
- Anti-protozoal drugs
- Antihelminthic drug therapy
- Agents to treat helminthic infections
- Agents to treat viral infections
- Inhibition of virus entry
- Inhibition of nucleic acid synthesis
- Inhibition of viral assembly/release
Mechanisms of Antimicrobial Resistance
Microorganisms develop drug resistance through spontaneous mutations, horizontal transfer of resistance factors, or metabolic changes.
- Antimicrobial Resistance
- Spontaneous mutations
- Horizontal transfer
- Resistance (R) factors
- Conjugation
- Transformation
- Transduction
- Beta-lactamases
- Multidrug-resistant (MDR) pumps
- Natural Selection
New Approaches to Antimicrobial Therapy
New approaches to antimicrobial therapy include RNA interference strategies, mimicking defense peptides, CRISPR, drugs from noncultivable bacteria, bacteriophages, and probiotics.
- Urgent threats
- Serious threats
- Concerning threats
- RNA interference strategies
- Defense peptides
- CRISPR
- Noncultivable bacteria
- Bacteriophages
- Probiotics
Microbial Interactions and Drug Adverse Reactions
Nutrients encourage the growth of beneficial microbes and drugs can cause adverse toxic reactions or allergic responses in the host.
- Prebiotics
- Fructans
- Bifidobacterium
- Fecal transplants
- Clostridioides difficile infection
- Ulcerative colitis
- Selective toxicity
- Chemotherapy
- Adverse side effect
- Antibacterials
- Carbenicillin
- Ampicillin
- Cephalosporins
- Sulfonamides
- Polymyxin
- Quinolones
- Antifungals
- Amphotericin B
- Flucytosine
- Antiprotozoal drugs
Antimicrobials and Microbiota Alteration
Broad-spectrum antimicrobials can cause suppression and alteration of the microbiota, leading to superinfection and the development of resistance.
- Normal microbial colonists
- Broad-spectrum antimicrobials
- Superinfection
- Antibiotic-associated colitis
- Clostridioides difficile
- Drug resistance
- Bystander microbes
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