Multiple Choice
If the phi & psi angles of loop regions are plotted, where do they tend to fall on the Ramachandran plot below?
4. Protein Structure
Beta Turns
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Which of the following statements is true regarding β-turns?
A
Only Type I β-turns are stabilized by hydrogen bonds, not Type II β-turns.
B
Type II β-turns have a Pro residue at position #2 of the turn.
C
Type I β-turns have a Gly residue at position #4 of the turn.
D
Type II β-turns have a Gly residue at position #3 of the turn.
Verified step by step guidance1
Understand the structure of β-turns: β-turns are a type of secondary structure in proteins that allow the peptide chain to reverse direction. They are typically composed of four amino acid residues.
Recognize the types of β-turns: There are two main types of β-turns, Type I and Type II, each with distinct structural characteristics.
Identify the role of specific amino acids in β-turns: Glycine (Gly) and Proline (Pro) are often found in β-turns due to their unique structural properties. Glycine is small and flexible, while Proline introduces a kink in the peptide chain.
Examine the position of Glycine in Type II β-turns: In Type II β-turns, Glycine is commonly found at position #3, which helps accommodate the tight turn due to its small size.
Evaluate the given statements: The statement 'Type II β-turns have a Gly residue at position #3 of the turn' is true, as it aligns with the structural characteristics of Type II β-turns.
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