Open Question
Draw a two-stranded antiparallel β-sheet with appropriate hydrogen bonding between the following peptides:
1) L-A-D-Y.
2) G-A-G-A.
3
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4. Protein Structure
Antiparallel and Parallel Beta Sheets
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Which (phi, psi) pair of bond angles is closest to those of the residues shown in the figure below?
A
(-90, -90).
B
(-90, 90).
C
(90, -90).
Verified step by step guidance1
Identify the secondary structure shown in the image. The image depicts a beta-sheet, which is a common secondary structure in proteins.
Understand that the phi (φ) and psi (ψ) angles are the dihedral angles in the backbone of the protein structure. These angles determine the conformation of the protein's secondary structure.
Recall that in a beta-sheet, the typical phi (φ) and psi (ψ) angles are around -135° and 135°, respectively. However, these angles can vary slightly depending on the specific type of beta-sheet.
Compare the given options of phi and psi angles with the typical angles for a beta-sheet. The options are (-90, -90), (-90, 90), and (90, -90).
Determine which pair of angles is closest to the typical beta-sheet angles. The pair (-90, 90) is the closest to the expected angles for a beta-sheet, making it the correct choice.
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