[gmx-users] dihedral restraints in v3.3 different than v3.3.1 (or broken)

[Behnoush Zare]

Dear Dr. Neale,

I try to perform dihedral_restraints on protein helices. Searching on this subject in the gromacs manual, wiki.gromacs and gmx-mailing list give me some clue but it is not clear for me yet. Also I did some you suggest in following address: 
http://www.gromacs.org/pipermail/gmx-users/2006-December/025087.html 

In my top file I added lines below and include all the atoms in the helices in case of A,B,C,D:

[ dihedral_restraints ]
; ai   aj    ak    al  type  label  phi  psi   dphi  kfac  power
   A    B     C     D    1     1    180  180     0     1      2

And in the mdp file I include these lines:
;dihedral restraints
dihre               =  simple
dihre_fc            =  100     
dihre_tau           =  0.0
nstdihreout         =  50


But I have got error in processing the top file.

Fatal error:
Ther were 1 error(s) processing your input

I have referred to the manual and not found any thing about dihedral_restraints details. Would you please explain to me what I should do.
Thank you very much in advance for your kindness and expertize.

Best regards
Behnoush
----- Original Message -----
From: "chris neale" <chris.neale at utoronto.ca>
To: gmx-users at gromacs.org
Sent: Sunday, January 27, 2008 10:13:42 AM (GMT+0330) Asia/Tehran
Subject: [gmx-users] dihedral restraints in v3.3 different than v3.3.1 (or broken)

This is just a notice for the archives.

I was recently working on a new cluster where only gromacs 3.3 is  
installed. It took me a while to figure out that the [  
dihedral_restraints ] section is either differently implemented or  
broken in 3.3 compared to 3.3.1. Since the online list of revisions is  
not up to date past 3.2, I thought I would put a note on the mailing  
list.

There is some discussion about versions and dihedral restraints here:
http://www.gromacs.org/pipermail/gmx-users/2006-March/020512.html

And for using dihedral restraints in 3.3.1, a description is here:
http://www.gromacs.org/pipermail/gmx-users/2006-December/025087.html


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