Re: alpha helix and beta conformation in proteins
From: Bob (bbruner_at_uclink4.berkeley.edu)
Date: 12/22/04
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Date: Tue, 21 Dec 2004 20:45:54 -0800
On 21 Dec 2004 02:55:45 -0600,
elloumi@bio.titech.ac-dot-jp.no-spam.invalid (eemen) wrote:
>could some tell me how the alpha helix and the beta conformation in
>proteins are important in the configuration of proteins.
They just happen to be two of the most common general backbone
structures (and the first two that were clearly worked out).
>is it a
>question of energy of rotation? what's the difference between the
>helix alpha and the helix beta.
Should be good pictures, with explanations, in most any modern biology
book. Both rely on hydrogen bonding between amide groups of the
backbone. In the alpha helix, the hydrogen bonding is along the axis
of the coiled chain (the helix). In the beta form, a simple view is
that segments of the chain are stretched out and lined up along side
each other, with H-bonds between the stretched out segments (i.e,
perpendicular to the axis of any particular segment).
bob
>why it's so commun to precise it in
>the structure of proteins
>
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