Alpha helices are a type of secondary structure in proteins..?
Alpha helices are a type of secondary structure in proteins. What is the length of a 49.0kDa single‑stranded α‑helical protein segment? Assume a mean residue mass of 110 Da.
- hcbiochemLv 71 month ago
Number of residues = 49000 D / 110 D/residue = 445 residues
Number of turns of alpha helix = 445 residues / 3.6 residues/turn = 124 turns
Each turn of the alpha helix has a pitch of 5.4 angstrom or 0.54 nm. So
124 turns X 5.4 angstrom/turn = 668 angstrom = 66.8 nm