Question
Helix length. Calculate the axial length of an $\alpha$ helix that is 120 amino acids long. How long would the polypeptide be if it were fully extended?
Step 1
It is a right-handed coiled or spiral conformation, in which every backbone N-H group donates a hydrogen bond to the backbone C=O group of the amino acid located three or four residues earlier along the protein sequence. Show more…
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Calculate the axial length of an alpha helix that is of 120 amino acids long? How long would the polypeptide be if it were fully extended?
a. How long is an $\alpha$ -helix that contains 74 amino acids? b. How long is a fully extended peptide chain that contains the same number of amino acids? (The distance between consecutive amino acids in a fully extended chain is $3.5 \AA$; the repeat distance of an $\alpha \text { -helix is } 5.4 \AA .)$
What is the length of a polypeptide with 80 amino acids residues in a single, contiguous α helix? (Hint: An idealized α helix has 3.6 residues per turn and rise along helical axis is 5.4 Å)
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