Multiple Choice
Heat shock protein 70 (HSP70), a chaperone protein found in many organisms, is one of the most highly conserved proteins in all of biology.Which of the following statements about HSP70 is true?
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4. Protein Structure
Chaperone Proteins
Multiple Choice
Which statement most accurately characterizes the effect of high temperatures (>50˚C) on protein folding?
A
High temperatures increase the rate of protein folding so proteins adopt their native fold faster.
B
There is little to no effect of high temperature on protein folding.
C
At high temperatures, proteins are denatured but will re-fold into their native state upon cooling.
D
At high temperatures, proteins are denatured and at risk of forming intermolecular aggregates.
Verified step by step guidance1
Understand the concept of protein folding: Proteins fold into specific three-dimensional structures that are crucial for their function. This folding is driven by interactions such as hydrogen bonds, hydrophobic interactions, and van der Waals forces.
Recognize the impact of temperature on protein structure: High temperatures can disrupt the non-covalent interactions that stabilize the protein's native structure, leading to denaturation.
Define denaturation: Denaturation refers to the loss of the native structure of a protein, which often results in loss of function. This process is typically irreversible at high temperatures.
Consider the risk of aggregation: When proteins are denatured, they may expose hydrophobic regions that can lead to intermolecular interactions, causing aggregation. Aggregates are often non-functional and can be detrimental to cellular processes.
Conclude the effect of high temperatures: High temperatures (>50˚C) generally lead to protein denaturation and increase the risk of forming intermolecular aggregates, rather than promoting faster folding or having little effect.
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