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How can I get the final optimized coordinate PDB file after molecular mechanics optimization?

From NWChem

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After molecular mechanics optimization, I could not get optimized coordinate PDB file. The "1IVD_opt_final_1.pdb" was the same as the "1IVD_opt.pdb" file. How can I get the final optimized coordinate PDB file?

The prepare file is as follow:

start 1IVD

permanent_dir ./perm
scratch_dir ./data

prepare
system 1IVD_opt
source 6.pdb
periodic
new_top new_seq
new_rst
center
orient
solvate box 8.0
modify segment 471 quantum
update lists
ignore
write 1IVD_opt.pdb
write 1IVD_opt.rst
end

task prepare

The MM optimization input file is as follow:

echo

start 1IVD

memory total 25000 Mb
permanent_dir ./perm
scratch_dir ./data

prepare
read 1IVD_opt.rst
write 1IVD_opt_mm_1.rst
end

task prepare

md
system 1IVD_opt
sd 2000 init 0.01 min 1.0e-5 max 0.05
noshake solute
msa 6000
record rest 1
record coord 1
print step 1 extra
print energies 1
end

task md optimize

prepare
read 1IVD_opt.rst
write 1IVD_opt_final_1.pdb
end

task prepare


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