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Ch. 8 - Molecular Biology of Transcription and RNA Processing
Sanders - Genetic Analysis: An Integrated Approach 3rd Edition
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Tutti i libri di testoSanders 3rd EditionCh. 8 - Molecular Biology of Transcription and RNA ProcessingProblema 16a
Capitolo 8, Problema 16a

The segment of the bacterial TrpA gene involved in intrinsic termination of transcription is the following:
3'-TGGGTCGGGGCGGATTACTGCCCCGAAAAAAAACTTG-5'
5'-ACCCAGCCCCGCCTAATGACGGGGCTTTTTTTTGAAC-3' Draw the mRNA structure that forms during transcription of this segment of the TrpA gene.

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1
Identify the template strand for transcription. In this case, the template strand is the 3'-5' strand (3'-TGGGTCGGGGCGGATTACTGCCCCGAAAAAAAACTTG-5'). The RNA polymerase will use this strand to synthesize the complementary mRNA strand.
Transcribe the mRNA sequence by pairing complementary RNA nucleotides to the template strand. Replace thymine (T) in the DNA with uracil (U) in the RNA. For example, A pairs with U, T pairs with A, G pairs with C, and C pairs with G.
Determine the sequence of the mRNA. The resulting mRNA sequence will be complementary to the template strand and will run in the 5'-3' direction. For example, the first few bases of the mRNA will be 5'-ACCCAGCCCCGC...-3'.
Analyze the mRNA sequence for the intrinsic termination signal. Intrinsic termination in bacteria often involves a GC-rich region followed by a series of uracil (U) residues. The GC-rich region forms a hairpin loop structure, and the U-rich region causes the RNA polymerase to dissociate.
Draw the mRNA structure. Represent the GC-rich region as a hairpin loop, with complementary base pairing between the GC-rich sequences. Follow this with a single-stranded U-rich tail to complete the intrinsic termination structure.

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Transcription

Transcription is the process by which the genetic information encoded in DNA is copied into messenger RNA (mRNA). During transcription, RNA polymerase binds to the DNA at the promoter region and synthesizes a complementary RNA strand using one of the DNA strands as a template. This process is crucial for gene expression, as it allows the information in genes to be translated into proteins.
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Eukaryotic Transcription

mRNA Structure

mRNA, or messenger RNA, is a single-stranded nucleic acid that carries the genetic code from DNA to the ribosome, where proteins are synthesized. The structure of mRNA includes a 5' cap, a coding region that corresponds to the gene, and a poly-A tail at the 3' end. Understanding the mRNA structure is essential for visualizing how the genetic code is translated into functional proteins.
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Ribosome Structure

Intrinsic Termination

Intrinsic termination is a mechanism that signals the end of transcription in prokaryotes, such as bacteria. It occurs when a specific sequence in the newly synthesized RNA forms a stable hairpin structure followed by a series of uracil (U) nucleotides, causing RNA polymerase to dissociate from the DNA. This process is vital for ensuring that transcription stops at the correct location, preventing the production of unnecessary RNA.
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Translation Termination
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The segment of the bacterial TrpA gene involved in intrinsic termination of transcription is the following:

3'-TGGGTCGGGGCGGATTACTGCCCCGAAAAAAAACTTG-5'

5'-ACCCAGCCCCGCCTAATGACGGGGCTTTTTTTTGAAC-3'

Explain how a sequence of this type leads to intrinsic termination of transcription.

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A 2-kb fragment of E. coli DNA contains the complete sequence of a gene for which transcription is terminated by the rho protein. The fragment contains the complete promoter sequence as well as the terminator region of the gene. The cloned fragment is examined by band shift assay. Each lane of a single electrophoresis gel contains the 2-kb cloned fragment under the following conditions:

Lane 1: 2-kb fragment alone

Lane 2: 2-kb fragment plus the core enzyme

Lane 3: 2-kb fragment plus the RNA polymerase holoenzyme

Lane 4: 2-kb fragment plus rho protein

Diagram the relative positions expected for the DNA fragments in this gel electrophoresis analysis.

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Domanda del libro di testo

The segment of the bacterial TrpA gene involved in intrinsic termination of transcription is the following:

3'-TGGGTCGGGGCGGATTACTGCCCCGAAAAAAAACTTG-5'

5'-ACCCAGCCCCGCCTAATGACGGGGCTTTTTTTTGAAC-3'

Label the template and coding DNA strands.

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The eukaryotic gene Gen-100 contains four introns labeled A to D. Imagine that Gen-100 has been isolated and its DNA has been denatured and mixed with polyadenylated mRNA from the gene.

Are intron regions single stranded or double stranded? Why?

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Domanda del libro di testo

The eukaryotic gene Gen-100 contains four introns labeled A to D. Imagine that Gen-100 has been isolated and its DNA has been denatured and mixed with polyadenylated mRNA from the gene.

Illustrate the R-loop structure that would be seen with electron microscopy.

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Domanda del libro di testo

The eukaryotic gene Gen-100 contains four introns labeled A to D. Imagine that Gen-100 has been isolated and its DNA has been denatured and mixed with polyadenylated mRNA from the gene.

Label the introns.

587
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