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a-helix vs. B-pleated sheets in terms of H-bonding

Explain, with reference to hydrogen bonding, why the a-helix and B-sheet secondary structures of proteins are different?

This is an IB question, does anyone know what they are looking for?
i know that a-helix is a spiral structure and that B-sheet is pleated sheets but how do i answer in terms of H-bonding?
Reply 1
Avatar for Bateman
Bateman
17
yeah, you just copy and pasted your hw question, so i'm not helping you.
Research this a little more and do it yourself.
I'll give you a tip though, the a is spiral because it doesn't bond to it's neighbours, and b does.
Reply 2
Avatar for Oracle_163
Oracle_163
alpha helix assumes the conformation due to the extensive hydrogen bonding between every four CO and NH groups of the amino acids(if I'm not wrong), whereas beta pleated sheet is due to the parallel nature of the CO-NH groups hence it assumes a sheet form.

Work on from there =)

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