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

From: Jason Swails <jason.swails.gmail.com>
Date: Wed, 10 Feb 2016 07:44:28 -0500

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 - 05:00:03 PST
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