Helices can be described by the notation nm where n is the n

Helices can be described by the notation n_m, where n is the number of residues per helical turn and m is the number of atoms, including H, in the ring that is closed by the H bond.

a. What is the notaiton for the alpha helix?

b. Is the 3₁₀ helix steeper or shallower than the alpha helix?

Solution

answer a}   The Notation for the Alpha helix is as follows:

where,

N = number of repeating units per turn

M= the number of atoms that complete the cyclic system that is enclosed by the hydrogen bond.

so the Nm notation for the alpha helix is 3.6_13

answer b}

310 helix is definetely steeper as it has 6 Angstroms pitch in comparison to alpha helix it contains only 5.4 Angstroms.