교과서 질문
Describe the role of attenuation in the regulation of tryptophan biosynthesis.
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Ch. 15 - Regulation of Gene Expression in Bacteria
Klug10th EditionEssentials of GeneticsISBN: 9780135588789
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Table of contents
- Ch. 1 - Introduction to Genetics16
- Ch. 2 - Mitosis and Meiosis28
- Ch. 3 - Mendelian Genetics37
- Ch. 4 - Modification of Mendelian Ratios53
- Ch. 5 - Sex Determination and Sex Chromosomes32
- Ch. 6 - Chromosome Mutations: Variation in Number and Arrangement37
- Ch. 7 - Linkage and Chromosome Mapping in Eukaryotes36
- Ch. 8 - Genetic Analysis and Mapping in Bacteria and Bacteriophages24
- Ch. 9 - DNA Structure and Analysis38
- Ch. 10 - DNA Replication29
- Ch. 11 - Chromosome Structure and DNA Sequence Organization22
- Ch. 12 - The Genetic Code and Transcription36
- Ch. 13 - Translation and Proteins27
- Ch. 14 - Gene Mutation, DNA Repair, and Transposition34
- Ch. 15 - Regulation of Gene Expression in Bacteria22
- Ch. 16 - Regulation of Gene Expression in Eukaryotes37
- Ch. 17 - Recombinant DNA Technology27
- Ch. 18 - Genomics, Bioinformatics, and Proteomics30
- Ch. 19 - The Genetics of Cancer21
- Ch. 20 - Quantitative Genetics and Multifactorial Traits37
- Ch. 21 - Population and Evolutionary Genetics45
15장, 문제 15
Bacterial sRNAs can bind to mRNAs through complementary binding to regulate gene expression. What determines whether the sRNA/mRNA binding will promote or repress mRNA translation?
검증된 단계별 안내1
Understand that bacterial sRNAs regulate gene expression by binding to mRNAs through complementary base pairing, affecting translation.
Recognize that the outcome of sRNA/mRNA binding depends on the specific binding site on the mRNA, such as the ribosome binding site (RBS) or other regulatory regions.
If the sRNA binds near or overlaps the ribosome binding site, it can physically block ribosome access, leading to repression of translation.
Alternatively, sRNA binding can stabilize the mRNA or alter its secondary structure to expose the ribosome binding site, thereby promoting translation.
Therefore, the key factor determining promotion or repression is the location and effect of the sRNA binding on the mRNA's accessibility to the ribosome and its stability.
주요 개념
질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.
sRNA-mRNA Complementary Binding
Small RNAs (sRNAs) regulate gene expression by base-pairing with target mRNAs through complementary sequences. This binding can affect mRNA stability or translation efficiency depending on the binding site and interaction strength.
추천 영상:
가이드 코스
08:39
mRNA Processing
Mechanisms of Translation Regulation by sRNAs
sRNA binding can either block the ribosome binding site (RBS) to repress translation or expose the RBS by altering mRNA structure to promote translation. The outcome depends on where the sRNA binds relative to key regulatory regions on the mRNA.
추천 영상:
가이드 코스
07:58Translation initiation
Role of RNA Chaperones and mRNA Structure
Proteins like Hfq assist sRNAs in binding mRNAs and influence the regulatory effect. Additionally, the secondary structure of mRNA affects accessibility of binding sites, determining whether sRNA binding stabilizes or destabilizes the mRNA or alters translation.
추천 영상:
가이드 코스
05:43RNA
관련 실천
교과서 질문
A bacterial operon is responsible for the production of the biosynthetic enzymes needed to make the hypothetical amino acid tisophane (tis). The operon is regulated by a separate gene, R. The deletion of R causes the loss of enzyme synthesis. In the wild-type condition, when tis is present, no enzymes are made; in the absence of tis, the enzymes are made. Mutations in the operator gene (O⁻) result in repression regardless of the presence of tis. Is the operon under positive or negative control? Propose a model for:
(a) Repression of the genes in the presence of tis in wild-type cells
(b) The mutations.
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