[AMBER] No restraint defined when using torsional restraints

From: Kari Gaalswyk via AMBER <amber.ambermd.org>
Date: Mon, 15 Jan 2024 19:35:19 +0000

Hello,

I am trying to apply torsion restraints throughout the system, and the restraints are not being recognized during the minimization phase. I used makeANG_dist to create the RST file, and the min.in file is below:

energy minimization stage 1
 &cntrl
  imin=1, maxcyc=50000, ncyc=25000,
  cut=9.0, ntb=1,
  ntc=1, ntf=1,
  ntpr=10,
  ntr=1, nmropt=1,
  restraintmask=':1-242',
  restraint_wt=10.0
 /
&wt type='END'/
DISANG=RST

In the output file, it shows that the restraints are not being recognized but that the file is:

--------------------------------------------------------------------------------
   3. ATOMIC COORDINATES AND VELOCITIES
--------------------------------------------------------------------------------

default_name
 begin time read from input coords = 0.000 ps



           Begin reading energy term weight changes/NMR restraints
 WEIGHT CHANGES:
                         ** No weight changes given **

 RESTRAINTS:
 Requested file redirections:
  DISANG = RST
 Restraints will be read from file: RST
Here are comments from the DISANG input file:

                          ** No restraint defined **

                  Done reading weight changes/NMR restraints

The RST file looks like this:

&rst iat = 34,36,37,43,
r1 = -100.0, r2 = -80.00000, r3 = -40.00000, r4 = -20.0,
rk2 = 10, rk3 = 10,
&end

&rst iat = 36,37,43,45,
r1 = -100.0, r2 = -80.00000, r3 = -40.00000, r4 = -20.0,
rk2 = 10, rk3 = 10,
&end

I have followed a similar protocol before for distance restraints and had no problem (restraints were seen in .out file and distances constrained accordingly).

Cheers,
Kari Gaalswyk
University of Denver
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Received on Mon Jan 15 2024 - 12:00:02 PST
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