Re: [AMBER] problem with energy minimization (sander)

From: Maryam Hamzehee <maryam_h_7860.yahoo.com>
Date: Wed, 10 Feb 2016 13:13:27 +0000 (UTC)

Dear Jason
Many thanks for your email and reply. I set the igb=6, the problem was fixed.
Thanks a lotMaryam 
 

    On Wednesday, 10 February 2016, 16:14, Jason Swails <jason.swails.gmail.com> wrote:
 

 On Wed, Feb 10, 2016 at 7:26 AM, Maryam Hamzehee <maryam_h_7860.yahoo.com>
wrote:

> Dear all
> I am trying to do energy minimization with my protein, unfortunately it
> was stopped and gave the following error:
>  NSTEP      ENERGY          RMS            GMAX        NAME    NUMBER
>  71    NaN            NaN              0.0000E+00    N          1
>  BOND    =          NaN  ANGLE  =          NaN  DIHED      =
> NaN VDWAALS =        0.0000  EEL    =        0.0000  EGB        =
> -48743.1044 1-4 VDW =          NaN  1-4 EEL =          NaN  RESTRAINT  =
>        0.0000
> ​​
>
The pd
> ​​
> b file of protein as well as output file are attached.
> Your h
> ​​
> elp in this regard would be appreciated.
>

​This is weird.  The first step has EGB becoming NaN with the igb=1 model.
A couple ideas -- try a short minimization in the gas phase (igb=6).  Also
see if igb=2 or igb=5 gets the same kind of problems.

​Also look in your prmtop file for the flag RADIUS_SET.  What is the value
there?​


HTH,
Jason



>
> All the bestMaryam
>
>
>
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>


-- 
Jason M. Swails
BioMaPS,
Rutgers University
Postdoctoral Researcher
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Received on Wed Feb 10 2016 - 05:30:04 PST
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