Multiple Choice
True or False: Negatively charged residues near the α-helix N-terminal are stabilizing due to its net dipole.
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4. Protein Structure
Alpha Helix Hydrogen Bonding
Multiple Choice
The oxygen-storage protein myoglobin has 8 α-helices in its single polypeptide chain.Its 67th residue is near the center of a 19 residue α-helix. Which residue does the amino group of myoglobin's 67th residue hydrogen bond to?
A
63rd residue
B
64th residue
C
71st residue
D
72nd residue
Verified step by step guidance1
Understand the structure of an α-helix: In an α-helix, the backbone N-H group of an amino acid forms a hydrogen bond with the C=O group of the amino acid four residues earlier.
Identify the position of the 67th residue: The problem states that the 67th residue is near the center of a 19-residue α-helix.
Determine the hydrogen bonding pattern: Since the 67th residue is in an α-helix, its amino group will form a hydrogen bond with the carbonyl group of the residue located four positions earlier.
Calculate the residue number: Subtract 4 from 67 to find the residue number that the 67th residue's amino group hydrogen bonds to.
Verify the options: Compare the calculated residue number with the given options to identify the correct answer.
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