Open Question
In the peptide below, circle the individual amino acid residues indicating the most likely positions for β-turns:
4. Protein Structure
Beta Turns
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Which of the following options contains a true statement about protein turns & loops?
A
Loops & turns can interact with other proteins & the environment.
B
Loops are short links causing abrupt changes in direction & extend only from β strands.
C
Loops and turns usually contain hydrophilic residues located on the interior of proteins.
D
Loops exposed to an aqueous environment are usually composed of hydrophobic amino acids.
Verified step by step guidance1
Understand the role of loops and turns in protein structure. Loops and turns are regions that connect elements of secondary structure, such as α-helices and β-strands, and often contribute to the overall 3D shape of the protein.
Recognize that loops and turns are typically found on the surface of proteins, where they can interact with other molecules, including other proteins and the environment. This interaction is crucial for protein function.
Consider the composition of loops and turns. They often contain hydrophilic residues, which are more likely to be found on the surface of proteins, interacting with the aqueous environment.
Evaluate the statement about loops extending only from β strands. While loops can connect β strands, they are not limited to this role and can connect various elements of secondary structure.
Analyze the statement regarding hydrophobic amino acids in loops exposed to an aqueous environment. Typically, loops exposed to water are composed of hydrophilic amino acids, not hydrophobic ones, as hydrophilic residues are more compatible with water.
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