AMBER Archive (2009)

Subject: [AMBER] "rfree: End of file on unit 5"

From: Remya S R (amm07bi022_at_students.amrita.ac.in)
Date: Mon Mar 30 2009 - 01:21:53 CDT

Amber,

        I was trying to simulate 227d.pdb .First i edited the pdb file , such that it contained only the dna . A 1000 step minimization was carried out by keeping the dna fixed with 500kcal/mol Angstrom. This was then followed by a 25ps MD to warm up the system from 100K to 300K, with the dna fixed with a 100kcal/mol Angstrom restraint and 1fs time step. The system was further equilibrated by 25ps of MD at 300K, with restraint on the dna reduced to 50kcal/mol Angstrom using 2fs time step. A five step minimization protocol, each of 1000 steps was then used with the restraint gradually reduced by 5kcal/mol Angstrom progressively by starting with a 25kcal/mol Angstrom restraint .Till this step , everything went fine.
       Then I ran a 10ps MD simulation to heat the system from 100K to 300K with no restraints on the complex. I used the .rst file from the last minimization step as the coordinate file. This step didn't generate a .rst and .mdcrd file . When I opened the .out file, it had the message
                     "rfree: End of file on unit 5" .

I can't figure out , what went wrong . Please help me fix the problem. I am sending the files used and the command for the last step.

command : ./sander -O -i dna_fmd.in -o dnafmd.out -p dna_wat.prmtop -c dna_min55.rst -r dnafmd.rst -x dnafmd.mdcrd -ref dna_min55.rst

with regards
REMYA




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