[AMBER] query regaridng unrestarint minimization step

From: Saman Yousuf ali <saman.yousufali64.yahoo.com>
Date: Fri, 2 Sep 2016 07:29:56 +0000 (UTC)

Dear All,I want to restraint specific residue of my target protein through out simulation. In normal MD, first step of protein-ligand complex minimzation; water is free to move and gradually released restraint on both protein-ligand and counterions. After that, unrestraint minimization step water protein-ligand atoms and counterions set free to move. My question is, for my case can I apply restraint on above mentioned residues in unrestraint step of minimization and equilibration as well or not?  I have pasted two unrestrain minimization step scripts below; suggest me which one is fine for my case.
unrestraint.in=============
protein-ligand md &cntrl
  imin   = 1,
  maxcyc = 500,
  ntpr   = 5,
  ntb    = 1,
  cut    = 10.0
 /
END
END

unrestraint.in===========protein-ligand md
 &cntrl
  imin   = 1,
  maxcyc = 500,
  ntpr   = 5,
  ntb    = 1,
  ntr    = 1,
  cut    = 10.0
 /
Hold the system fixed
5.0
RES 268 532
END
END
 Best Regards, Saman Yousuf Ali
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Received on Fri Sep 02 2016 - 01:00:02 PDT
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