Domanda del libro di testo
Describe the manner in which activators and repressors influence the rate of transcription initiation. How might chromatin structure be involved in such regulation?
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Ch. 17 - Transcriptional Regulation in Eukaryotes
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
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Capitolo 17, Problema 10
Explain how the addition of acetyl groups to histones leads to a weaker association of DNA in nucleosomes.
Guida verificata passo dopo passo1
Histones are proteins around which DNA is wrapped to form nucleosomes, the basic units of chromatin structure.
Histones have positively charged lysine residues that interact with the negatively charged phosphate groups of DNA, leading to a tight association.
Acetylation involves the addition of acetyl groups (CH3CO) to the lysine residues on histone tails.
The addition of acetyl groups neutralizes the positive charge on lysine residues, reducing the electrostatic attraction between histones and DNA.
This reduction in attraction results in a looser association of DNA with histones, making the DNA more accessible for transcription and other processes.
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Histone Acetylation
Histone acetylation is a post-translational modification where acetyl groups are added to the lysine residues of histone proteins. This modification neutralizes the positive charge of lysines, reducing the affinity between histones and the negatively charged DNA. As a result, the chromatin structure becomes more relaxed, facilitating access to the DNA for transcription and other processes.
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07:55
Histone Protein Modifications
Nucleosome Structure
Nucleosomes are the fundamental units of chromatin, consisting of DNA wrapped around a core of histone proteins. Each nucleosome contains approximately 147 base pairs of DNA and is connected by linker DNA. The structural arrangement of nucleosomes plays a crucial role in the compaction of DNA and the regulation of gene expression, as tighter packing can inhibit access to the DNA.
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07:10Chromosome Structure
Chromatin Remodeling
Chromatin remodeling refers to the dynamic changes in the structure of chromatin that allow for the regulation of gene expression. This process involves the repositioning or restructuring of nucleosomes, often facilitated by ATP-dependent chromatin remodeling complexes. Acetylation of histones is one mechanism that promotes chromatin remodeling, leading to a more open and accessible chromatin state, which is essential for transcriptional activation.
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04:35Chromatin
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Provide a brief description of two different types of histone modification and how they impact transcription.
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