Protein Production from Cloned Genes in E. coli
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Questions and Answers

What is the role of the promoter in E. coli gene expression?

  • Recognized by the ribosome
  • Recognized by the Sigma subunit of RNA polymerase (correct)
  • Indicates the end of the gene
  • Provides instructions for protein synthesis
  • Where is the initiation codon of a gene typically located in relation to the ribosome binding site?

  • Immediately downstream of it (correct)
  • Randomly placed within the gene
  • Within the ribosome binding site
  • Immediately upstream of it
  • What is the terminator responsible for in gene expression?

  • Initiating translation
  • Marking the end of the gene for transcription termination (correct)
  • Facilitating ribosome binding
  • Providing instructions for transcription
  • Why is it unlikely that a significant amount of recombinant protein will be synthesized in E. coli if a foreign gene is simply ligated into a standard vector?

    <p>The absence of proper expression signals for E. coli</p> Signup and view all the answers

    Which component of the transcriptional and translational apparatus recognizes the ribosome binding site?

    <p>Ribosome</p> Signup and view all the answers

    How does the terminator signal the end of gene transcription?

    <p>By forming stem-loop structure</p> Signup and view all the answers

    Study Notes

    Cloning Foreign Genes in E. coli

    • Cloning a foreign gene in E. coli without additional signals is unlikely to produce significant amounts of recombinant protein.
    • The expression of a cloned gene in E. coli requires specific signals recognized by the bacterium for transcription and translation.

    Signals Required for Gene Expression

    • Promoter: a short sequence of nucleotides that indicates the starting point of transcription, recognized by the Sigma (σ) subunit of RNA polymerase.
    • Ribosome binding site: a short nucleotide sequence recognized by the ribosome as the point of attachment to the mRNA molecule, located upstream of the initiation codon.
    • Terminator: a nucleotide sequence that marks the end of the gene, forming a stem–loop structure through self-base pairing, signaling the termination of transcription.

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    Description

    Learn why simply ligating a foreign gene into a standard vector and cloning it in E. coli may not lead to significant production of recombinant protein. Discover the importance of signals recognized by the bacterium for gene expression.

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