Problem 156 How might the presence of a fold... [FREE SOLUTION]

Chapter 8: Problem 156

How might the presence of a folding/refolding-chaperone mitigate the effects of a mis-sense mutation?

Short Answer

Expert verified

Chaperone proteins help mitigate the effects of mis-sense mutations by aiding in proper folding and refolding of the mutant proteins.

Step by step solution

Understand Mis-sense Mutation

A mis-sense mutation is a type of genetic mutation where one amino acid in a protein is replaced with another. This can potentially alter the protein's function if the new amino acid affects the structure or function of the protein.

Role of Chaperone Proteins

Chaperone proteins assist other proteins in folding correctly. They help stabilize the folding intermediates, prevent misfolding, and can assist in refolding denatured or misfolded proteins back to their correct conformation.

Mitigation Mechanism

When a mis-sense mutation occurs, it may lead to incorrect folding of the protein. Folding/refolding-chaperones can recognize misfolded or partially folded proteins, bind to them, and either help them fold correctly or refold them into the correct structure.

Practical Examples

For instance, heat shock proteins (HSPs) are a type of chaperone that can mitigate the effects of mis-sense mutations. In many cases, HSPs can prevent the protein from aggregating and maintain its function despite the mutation.

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Key Concepts

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

mis-sense mutation

A mis-sense mutation occurs when a single nucleotide change in the DNA sequence results in the substitution of one amino acid for another in the protein. This can have several possible effects:

It might have no effect if the change is in a less crucial part of the protein or if the amino acid properties are similar.
It might alter protein function if the new amino acid disrupts normal structure or function.
It can cause the protein to be misfolded, rendering it nonfunctional or toxic to cells.

Mis-sense mutations can be mostly neutral, beneficial, or harmful. The context within the protein's overall structure will heavily impact the mutation's consequence.

chaperone proteins

Chaperone proteins are a group of proteins that assist in the proper folding and maintenance of other proteins. They have several key roles:

Stabilizing unfolded proteins to prevent aggregation.
Assisting in folding proteins into their functional conformations.
Refolding misfolded proteins back to their correct shapes.

Some well-known chaperones include heat shock proteins (HSPs), which get their name from their upregulation in response to stress conditions like increased temperature. Chaperones work by binding to misfolded or partially folded polypeptides, providing an environment that is conducive to correct folding and preventing them from forming non-functional or toxic aggregates.

protein folding

Protein folding is the process by which a polypeptide chain folds into its three-dimensional active form. Proper folding is crucial for the protein to achieve its functional state. Here are some essential points:

Proteins begin as linear chains of amino acids synthesized by ribosomes.
The sequence of amino acids determines the pathway the protein will take to fold into its final structure.
Incorrect folding can lead to nonfunctional proteins or diseases such as Alzheimer's and cystic fibrosis.

Chaperone proteins play a vital role in ensuring proteins fold correctly. When mis-sense mutations cause misfolding, chaperone proteins act as a quality control system, ensuring that proteins attain their correct shapes and functions, mitigating the effects of potentially harmful mutations. This ability of chaperones is indispensable in maintaining cellular health and preventing diseases associated with protein misfolding.

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How might the presence of a folding/refolding-chaperone mitigate the effects of a mis-sense mutation?

Short Answer

Step by step solution

Understand Mis-sense Mutation

Role of Chaperone Proteins

Mitigation Mechanism

Practical Examples

Key Concepts

mis-sense mutation

chaperone proteins

protein folding

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