Ch. 8 - Molecular Biology of Transcription and RNA Processing

Sanders - Genetic Analysis: An Integrated Approach 3rd Edition

Sanders3rd EditionGenetic Analysis: An Integrated ApproachISBN: 9780135564172Non è quello che usi tu?Cambia libro di testo

Sanders 3rd Edition

Ch. 8 - Molecular Biology of Transcription and RNA Processing

Problema 18d

Capitolo 8, Problema 18d

A 3.5-kb segment of DNA containing the complete sequence of a mouse gene is available. The DNA segment contains the promoter sequence and extends beyond the polyadenylation site of the gene. The DNA is studied by band shift assay, and the following gel bands are observed.

Match these conditions to a specific lane of the gel.
3.5-kb fragment plus RNA polymerase II

Guida verificata passo dopo passo

Step 1: Understand the experimental setup. A band shift assay is used to study protein-DNA interactions. When RNA polymerase II binds to the DNA fragment, it alters the mobility of the DNA in the gel, causing a shift in the band position.

Step 2: Analyze the gel image provided. The gel contains five lanes, each showing bands corresponding to different experimental conditions. The lanes are numbered 1 through 5.

Step 3: Match the condition '3.5-kb fragment plus RNA polymerase II' to the appropriate lane. Look for a lane where the band is shifted compared to the control lane (which contains only the 3.5-kb DNA fragment without RNA polymerase II). This shift indicates the binding of RNA polymerase II to the DNA.

Step 4: Identify the control lane. Typically, the control lane will show the unaltered position of the 3.5-kb DNA fragment. Compare the band positions in the other lanes to this control to determine which lane shows the interaction with RNA polymerase II.

Step 5: Confirm the lane where the band is shifted upward or has altered mobility, as this indicates the presence of RNA polymerase II bound to the DNA fragment. This lane corresponds to the condition described in the problem.

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Promoter Sequence

The promoter sequence is a region of DNA located upstream of a gene that initiates transcription. It serves as the binding site for RNA polymerase and transcription factors, facilitating the assembly of the transcription machinery. Understanding the promoter's role is crucial for analyzing gene expression and the effects of regulatory elements.

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08:41

Sequencing Difficulties

RNA Polymerase II

RNA polymerase II is an enzyme responsible for synthesizing messenger RNA (mRNA) from a DNA template during transcription. It plays a vital role in gene expression by transcribing protein-coding genes. The interaction between RNA polymerase II and the promoter is essential for initiating transcription, making it a key focus in studies of gene regulation.

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RNA

Gel Electrophoresis

Gel electrophoresis is a laboratory technique used to separate DNA, RNA, or proteins based on their size and charge. In this method, samples are loaded into a gel matrix and subjected to an electric field, causing molecules to migrate. The resulting bands can be analyzed to determine the presence and size of specific fragments, which is critical for interpreting results in molecular biology experiments.

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Proteomics

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A 3.5-kb segment of DNA containing the complete sequence of a mouse gene is available. The DNA segment contains the promoter sequence and extends beyond the polyadenylation site of the gene. The DNA is studied by band shift assay, and the following gel bands are observed.

Match these conditions to a specific lane of the gel.

3.5-kb fragment alone

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Match these conditions to a specific lane of the gel.

3.5-kb fragment plus TFIIB, TFIID, TFIIF, and RNA polymerase II

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Match these conditions to a specific lane of the gel.

3.5-kb fragment plus TFIIB and TFIID

375

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Match these conditions to a specific lane of the gel.

3.5-kb fragment plus TFIIB

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A 1.0-kb DNA fragment from the end of the mouse gene described in the previous problem is examined by DNA footprint protection analysis. Two samples are end-labeled with ³²P and one of the two is mixed with TFIIB, TFIID, and RNA polymerase II. The DNA exposed to these proteins is run in the right-hand lane of the gel shown below and the control DNA is run in the left-hand. Both DNA samples are treated with DNase I before running the samples on the electrophoresis gel.

What length of DNA is bound by the transcriptional proteins? Explain how the gel results support this interpretation.

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Domanda del libro di testo

A 1.0-kb DNA fragment from the end of the mouse gene described in the previous problem is examined by DNA footprint protection analysis. Two samples are end-labeled with ³²P, and one of the two is mixed with TFIIB, TFIID, and RNA polymerase II. The DNA exposed to these proteins is run in the right-hand lane of the gel shown below and the control DNA is run in the left-hand. Both DNA samples are treated with DNase I before running the samples on the electrophoresis gel.

Draw a diagram of this DNA fragment bound by the transcriptional proteins, showing the approximate position of proteins along the fragment.

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