Which statement best describes the role of hydrophobic amino acids in protein folding?

Which statement best describes the role of hydrophobic amino acids in protein folding?

• A. They remain exposed to water on the protein surface.
• B. They determine the amino acid sequence during translation.
• C. They tend to be buried inside the protein away from water, helping folding.
• D. They are not involved in folding.

Answer: (C)

In aqueous environments, the tendency of hydrophobic amino acids to avoid water drives protein folding. Their nonpolar side chains cluster together away from the surrounding water, forming a hydrophobic core that stabilizes the folded structure. This burying of nonpolar residues reduces the disruptive effect that water has on exposed hydrophobic surfaces, making the overall folded state more favorable. That’s why the statement describing these residues as being buried inside the protein away from water and helping folding is the best description. For context, the exterior of a soluble protein is typically enriched in polar and charged amino acids, which interact favorably with water. The amino acid sequence itself, encoded in the genetic material, determines the order of residues, and while hydrophobic residues are important for folding, they don’t determine sequence during translation. Hydrophobic residues do play a central role in folding, so saying they’re not involved in folding would be misleading.

In aqueous environments, the tendency of hydrophobic amino acids to avoid water drives protein folding. Their nonpolar side chains cluster together away from the surrounding water, forming a hydrophobic core that stabilizes the folded structure. This burying of nonpolar residues reduces the disruptive effect that water has on exposed hydrophobic surfaces, making the overall folded state more favorable. That’s why the statement describing these residues as being buried inside the protein away from water and helping folding is the best description.

For context, the exterior of a soluble protein is typically enriched in polar and charged amino acids, which interact favorably with water. The amino acid sequence itself, encoded in the genetic material, determines the order of residues, and while hydrophobic residues are important for folding, they don’t determine sequence during translation. Hydrophobic residues do play a central role in folding, so saying they’re not involved in folding would be misleading.