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  • The hemagglutinin protein in influenza virus contains a long alpha helix, with 53 residues. Which of the following correctly describes the attributes of this alpha helix?<div class='qna-option'

The hemagglutinin protein in influenza virus contains a long alpha helix, with 53 residues. Which of the following correctly describes the attributes of this alpha helix?

Option: 1

The length is 75.6 A, 14 turns, total of 102 Hydrogen bonds


Option: 2

The length is 106 A, 14 turns, total of 106 Hydrogen bonds


Option: 3

The length is 75.6 A, 14 turns, total of 104 Hydrogen bonds


Option: 4

The length is 75.6 A, 10 turns, total of 102 Hydrogen bonds


Answers (1)

best_answer

In an ideal α helix, the pitch is 0.54 nm, the rise is 0.15 nm, and the number of amino acid residues required for one complete turn is 3.6 (i.e., approximately 3 2/3 residues: one carbonyl group, three N—Cα—C units, and one nitrogen). Most α helices are slightly distorted in proteins but they generally have between 3.5 and 3.7 residues per turn. The length is 75.6 A, 14 turns, total of 102 Hydrogen bonds. Hence, the correct answer is option 1. 

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Pankaj

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