Domanda del libro di testo
Several temperature-sensitive mutant strains of E. coli display the following characteristics. Predict what enzyme or function is being affected by each mutation.
Synthesis is very slow.
651
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Ch. 11 - DNA Replication and Recombination
Klug12th EditionConcepts of GeneticsISBN: 9780135564776
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TOC.tableOfContents
- Ch. 1 - Introduction to Genetics17
- Ch. 2 - Mitosis and Meiosis36
- Ch. 3 - Mendelian Genetics51
- Ch. 4 - Extensions of Mendelian Genetics74
- Ch. 5 - Chromosome Mapping in Eukaryotes51
- Ch. 6 - Genetic Analysis and Mapping in Bacteria and Bacteriophages46
- Ch. 7 - Sex Determination and Sex Chromosomes33
- Ch. 8 - Chromosome Mutations: Variation in Number and Arrangement40
- Ch. 9 - Extranuclear Inheritance31
- Ch. 10 - DNA Structure and Analysis43
- Ch. 11 - DNA Replication and Recombination44
- Ch. 12 - DNA Organization in Chromosomes30
- Ch. 13 - The Genetic Code and Transcription54
- Ch. 14 - Translation and Proteins47
- Ch. 15 - Gene Mutation, DNA Repair, and Transposition41
- Ch. 16 - Regulation of Gene Expression in Bacteria29
- Ch. 17 - Transcriptional Regulation in Eukaryotes41
- Ch. 18 - Post-transcriptional Regulation in Eukaryotes33
- Ch. 19 - Epigenetics33
- Ch. 20 - Recombinant DNA Technology44
- Ch. 21 - Genomic Analysis36
- Ch. 22 - Applications of Genetic Engineering and Biotechnology36
- Ch. 23 - Developmental Genetics37
- Ch. 24 - Cancer Genetics34
- Ch. 25 - Quantitative Genetics and Multifactorial Traits54
- Ch. 26 - Population and Evolutionary Genetics45
Klug12th EditionConcepts of GeneticsISBN: 9780135564776Non è quello che usi tu?Cambia libro di testo
Capitolo 11, Problema 21
While many commonly used antibiotics interfere with protein synthesis or cell wall formation, clorobiocin, one of several antibiotics in the aminocoumarin class, inhibits the activity of bacterial DNA gyrase. Similar drugs have been tested as treatments for human cancer. How might such drugs be effective against bacteria as well as cancer?
Guida verificata passo dopo passo1
Understand the role of DNA gyrase: DNA gyrase is an enzyme that introduces negative supercoils into DNA, which is essential for processes like DNA replication and transcription in bacteria. Inhibiting this enzyme disrupts these processes, leading to bacterial cell death.
Recognize the mechanism of clorobiocin: Clorobiocin, as an aminocoumarin antibiotic, specifically targets bacterial DNA gyrase, preventing it from functioning properly. This makes it effective against bacterial infections by halting their ability to replicate and transcribe DNA.
Connect to cancer treatment: Cancer cells often exhibit rapid and uncontrolled cell division, which requires efficient DNA replication. Drugs that inhibit enzymes involved in DNA replication, such as topoisomerases (similar to DNA gyrase in bacteria), can slow or stop the proliferation of cancer cells.
Explore the similarity between bacterial and cancer cell targets: While bacterial DNA gyrase is distinct from human topoisomerases, both enzymes play critical roles in managing DNA topology during replication. Drugs like clorobiocin may be modified to target human topoisomerases, making them effective against cancer cells.
Consider the broader implications: The ability of such drugs to disrupt essential DNA processes highlights their potential as dual-purpose treatments, targeting both bacterial infections and rapidly dividing cancer cells. Further research and development are needed to optimize their specificity and minimize side effects.
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DNA Gyrase
DNA gyrase is an essential enzyme in bacteria that introduces negative supercoils into DNA, which is crucial for DNA replication and transcription. By inhibiting this enzyme, antibiotics like clorobiocin prevent bacteria from properly managing their DNA, leading to cell death. This mechanism is particularly effective against rapidly dividing bacterial cells.
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Percorso guidato
01:45
DNA Proofreading
Aminocoumarin Antibiotics
Aminocoumarin antibiotics, such as clorobiocin, target bacterial DNA gyrase and are known for their ability to disrupt DNA replication. These antibiotics are structurally related to coumarin and are effective against a range of Gram-positive and some Gram-negative bacteria. Their unique mechanism of action makes them a valuable tool in treating bacterial infections.
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02:19R Plasmid
Cancer Treatment Mechanisms
Some antibiotics, including those that inhibit DNA gyrase, have been explored for cancer treatment due to their ability to interfere with DNA replication in rapidly dividing cells, a hallmark of cancer. By targeting the DNA replication machinery, these drugs can potentially slow down or stop the proliferation of cancer cells, similar to their effect on bacteria.
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09:46Cancer Characteristics
Pratica correlata
Domanda del libro di testo
Several temperature-sensitive mutant strains of E. coli display the following characteristics. Predict what enzyme or function is being affected by each mutation.
Supercoiled strands remain after replication, which is never completed.
706
views
Domanda del libro di testo
Many of the gene products involved in DNA synthesis were initially defined by studying mutant E. coli strains that could not synthesize DNA.
The dnaQ gene encodes the ε subunit of DNA polymerase. What effect is expected from a mutation in this gene?
491
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Domanda del libro di testo
Many of the gene products involved in DNA synthesis were initially defined by studying mutant E. coli strains that could not synthesize DNA.
The dnaE gene encodes the α subunit of DNA polymerase III. What effect is expected from a mutation in this gene? How could the mutant strain be maintained?
614
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Domanda del libro di testo
Several temperature-sensitive mutant strains of E. coli display the following characteristics. Predict what enzyme or function is being affected by each mutation.
No initiation occurs.
743
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Domanda del libro di testo
Describe the 'end-replication problem' in eukaryotes. How is it resolved?
943
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