alanine dipeptide: no dihdral energy terms?

From: Sebastian Stolzenberg (s.stolzenberg_at_gmail.com)
Date: Mon Mar 23 2009 - 22:33:03 CDT

Dear All,

I am a little confused trying to find dihedral force constants for my
alanine dipeptide (see bottom of this e-mail).
I ran simulations with "par_all27_prot_na.inp", but meticulously looking
for atoms along the backbone, I don't find any dihedral entries for it.

Does anybody know the solution to my mystery?
Thank you,
Best,
Sebastian

ATOM 1 CAY ALA P 1 12.989 -6.219 -7.507 1.00 0.00
PEPT
ATOM 2 HY1 ALA P 1 12.850 -6.809 -6.576 1.00 0.00
PEPT
ATOM 3 HY2 ALA P 1 14.065 -6.060 -7.736 1.00 0.00
PEPT
ATOM 4 HY3 ALA P 1 12.596 -6.978 -8.217 1.00 0.00
PEPT
ATOM 5 CY ALA P 1 12.196 -4.913 -7.519 1.00 0.00
PEPT
ATOM 6 OY ALA P 1 12.278 -4.195 -6.513 1.00 0.00
PEPT
ATOM 7 N ALA P 1 11.355 -4.629 -8.508 1.00 0.00
PEPT
ATOM 8 HN ALA P 1 11.423 -5.192 -9.327 1.00 0.00
PEPT
ATOM 9 CA ALA P 1 10.519 -3.408 -8.519 1.00 0.00
PEPT
ATOM 10 HA ALA P 1 11.150 -2.587 -8.213 1.00 0.00
PEPT
ATOM 11 CB ALA P 1 10.129 -3.154 -9.950 1.00 0.00
PEPT
ATOM 12 HB1 ALA P 1 10.953 -3.079 -10.692 1.00 0.00
PEPT
ATOM 13 HB2 ALA P 1 9.608 -4.060 -10.328 1.00 0.00
PEPT
ATOM 14 HB3 ALA P 1 9.549 -2.207 -9.937 1.00 0.00
PEPT
ATOM 15 C ALA P 1 9.407 -3.423 -7.442 1.00 0.00
PEPT
ATOM 16 O ALA P 1 9.492 -2.936 -6.326 1.00 0.00
PEPT
ATOM 17 NT ALA P 1 8.194 -3.936 -7.766 1.00 0.00
PEPT
ATOM 18 HNT ALA P 1 8.122 -4.379 -8.656 1.00 0.00
PEPT
ATOM 19 CAT ALA P 1 7.156 -4.023 -6.744 1.00 0.00
PEPT
ATOM 20 HT1 ALA P 1 7.251 -3.539 -5.748 1.00 0.00
PEPT
ATOM 21 HT2 ALA P 1 6.277 -3.623 -7.293 1.00 0.00
PEPT
ATOM 22 HT3 ALA P 1 6.830 -5.084 -6.721 1.00 0.00
PEPT

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