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The number of α-helical turns permeating the membrane Common Data: The width of the lipid bilayer membrane is 30 Å. It is permeated by a protein which is a right-handed α-helix. (A) 5.6 turns (B) 3.5 turns (C) 6.5 turns (D) 5.0 turns
The number of α-helical turns permeating the membrane
Common Data: The width of the lipid bilayer membrane is 30 Å. It is permeated by a protein which is a right-handed α-helix.
(A) 5.6 turns
(B) 3.5 turns
(C) 6.5 turns
(D) 5.0 turns
Answer
Answer: (D) 5.0 turns
Each turn of an α-helix spans about 5.4 Å. For a 30 Å membrane width, the number of turns is approximately 30/5.4≈5.0
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