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-   -   Why is free rotation around the N-Cα bond of a peptide not allowed? (http://www.molecularstation.com/forum/peptide-forum/86539-why-free-rotation-around-n-c-alpha%3B-bond-peptide-not-allowed.html)

Charlie Shore 09-27-2012 04:16 PM

Why is free rotation around the N-Cα bond of a peptide not allowed?
 
Why is free rotation around the N-C? bond of a peptide not allowed?

A Steric clash from amino side chains prevents rotation from occurring.
B sp-hybridization due to the partial double bond character prevents rotation from occurring.
C Protein tertiary structure prevents rotation from occurring.
D The free electron pair of the nitrogen atom repulses the C? atom, preventing rotation from occurring.
E Free rotation around the N-C? bond of a peptide is allowed.

Kunal Pandya 09-28-2012 01:26 PM

Re: Why is free rotation around the N-Cα bond of a peptide not allowed?
 
Ans (B)

The partial double bond nature of the peptide bond means that there is not free rotation about the C -- N bond


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