Re: Q: Helix dipoles
Simon Brocklehurst (smb@bioch.ox.ac.uk)
Fri, 15 Mar 1996 13:20:20 +0000 (GMT)
> So, I think that alpha-helix in this example has a greater dipole moment
> than the 3-10 helix.
> In the proposed approximation, the total dipole moment in an helix is the
> sum of the contributes coming from the dipoles present in each AA.
> The dipoles coming from the C-O and N-H in each AA are parallel to the axis
> of helix if this is an alpha elix.In 3-10 helix, C-O and N-H bonds of each
> AA form an angle with the axis, so just a componet of each dipole contribute
> to the final value.
>
Hi Cristina,
Thanks for taking the time to post an answer! You're absolutely
correct in what you say. Are there any other structural feature
of helices (i.e. apart from orientation of H-bonds relative to the
helical axis) that affect the "partial charges" at their terminii?
-- Simon
_____________________________________________________________________________
|
| ,_ o Simon M. Brocklehurst,
| / //\, Oxford Centre for Molecular Sciences, Department of Biochemistry,
| \>> | University of Oxford, Oxford, UK.
| \\, E-mail: smb@bioch.ox.ac.uk | WWW: http://www.ocms.ox.ac.uk/~smb/
|____________________________________________________________________________