Re: [AMBER] First to Second Frame Position Jump

From: Carlos Simmerling <carlos.simmerling.gmail.com>
Date: Wed, 10 Jul 2013 21:05:36 -0400

It's in the run script. Send that too...
On Jul 10, 2013 7:57 PM, "Parker de Waal" <Parker.deWaal09.kzoo.edu> wrote:

> Hi Carlos,
>
> To my knowledge the initial protein.prmtop matches the protein.inpcrd,
> however I don't know how to check this. Do you have any suggestions?
>
> Best,
> Parker
> On Jul 10, 2013 7:51 PM, "Carlos Simmerling" <carlos.simmerling.gmail.com>
> wrote:
>
> > Does the reference coordinate set exactly match the inpcrd?
> > On Jul 10, 2013 6:47 PM, "Parker de Waal" <Parker.deWaal09.kzoo.edu>
> > wrote:
> >
> > > Hi Everyone,
> > >
> > > I've come across an issue where between the first and second frame of
> an
> > 1
> > > ns equilibrium simulation (NPT ensemble, position restrained, post
> > heating
> > > and density additions) my protein and ions seem to jump drastically
> > causing
> > > a very large rmsd. Additionally it seems that my ions are clumped
> > together
> > > on the first frame and re-enter the solution during the second frame.
> > >
> > > Here are my simulation parameters:
> > > Equil
> > > &cntrl
> > > imin=0,irest=1,ntx=5,
> > > nstlim=500000,dt=0.002,
> > > ntc=2,ntf=2,
> > > cut=9.0, ntb=2, ntp=1, taup=2.0,
> > > ntpr=1000, ntwx=1000,
> > > ntt=3, gamma_ln=2.0,
> > > temp0=300.0,
> > > ntr=1, restraintmask=':1-466',
> > > restraint_wt=0.5,
> > > ioutfm = 1,
> > > /
> > >
> > > Maybe irest should equal 0? Or maybe I need to supply a tempi?
> > >
> > > For those interested I have uploaded the first 20 frames of simulation,
> > > sans water, here -> research.parkerdewaal.com/furge/prot_traj.zip
> > >
> > > Thanks Everyone again!
> > >
> > > Parker
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Received on Wed Jul 10 2013 - 18:30:03 PDT
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