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Chapter 14: Problem 27

How would the deletion of the Shine-Dalgarno sequence affect a bacterial mRNA?

Short Answer

Expert verified
Deletion of the Shine-Dalgarno sequence likely results in impaired translation initiation, preventing protein synthesis.

Step by step solution

01

Understanding the Shine-Dalgarno Sequence

The Shine-Dalgarno sequence is a ribosomal binding site in bacterial mRNA. It aligns the ribosome with the start codon of the mRNA for proper initiation of translation. It is usually located around 6-8 bases upstream of the start codon.
02

Predicting the Consequence of Deletion

If the Shine-Dalgarno sequence is deleted, the ribosome may not properly align with the mRNA. This misalignment can prevent the ribosome from recognizing the start codon, thus impairing translation initiation.
03

Exploring the Impact on Protein Synthesis

Without proper alignment and initiation at the start codon, protein synthesis might not occur because the mRNA would not be correctly translated into a protein. This could lead to the complete absence of the corresponding protein product.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Ribosomal Binding Site
In bacterial mRNA, the ribosomal binding site plays a crucial role in ensuring that protein synthesis begins correctly. The most well-known example of a ribosomal binding site in bacteria is the Shine-Dalgarno sequence. It's a short sequence of nucleotides found upstream of the start codon in mRNA.
  • This sequence ranges about 6-8 bases away from the start codon.
  • It helps position the ribosome precisely on the mRNA.
  • Proper alignment ensures the ribosome can begin translating the mRNA into protein effectively.
Correct functioning of the ribosomal binding site is vital. If this site is absent or malfunctioning, the mRNA cannot be translated efficiently, affecting the entire process of protein synthesis.
Translation Initiation
Translation initiation is the first step in the process by which cells begin to manufacture proteins. In bacteria, this process heavily relies on the interaction between the ribosome and the mRNA.
  • The ribosome must recognize the start codon, typically AUG, to start translation.
  • The Shine-Dalgarno sequence aids the ribosome in aligning correctly with the start codon.
However, if this sequence is deleted, the ribosome might fail to locate the start codon. This failure interrupts translation initiation, leading to significant biological consequences, as proteins are not synthesized.
Bacterial mRNA
Bacterial mRNA carries the genetic blueprint for protein synthesis from DNA to ribosomes. This form of mRNA is distinct because it often includes the Shine-Dalgarno sequence.
  • This ensures the mRNA is aligned correctly with the ribosome.
  • Effective translation depends on this precise interaction between mRNA and ribosome.
The integrity of mRNA, including proper sequences for binding, is essential for accurate translation. Any mutations or deletions here, like the removal of the Shine-Dalgarno sequence, can lead to improper or failed protein synthesis.
Protein Synthesis
Protein synthesis is a fundamental biological process where cells create new proteins. In bacteria, this is deeply reliant on the correct initiation and continuation of translation.
  • Proteins are synthesized from amino acids in a sequence dictated by the mRNA code.
  • The ribosome reads the mRNA's nucleotide sequence, adding amino acids to build the protein chain.
If initiation fails due to errors like missing the Shine-Dalgarno sequence, protein synthesis can be halted. This means the proteins necessary for various cellular functions might not be produced, potentially leading to cell dysfunctions or death.

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