sander failed with prmtop COM.prmtop!

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Gabriela Lima

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Apr 26, 2023, 2:39:52 PM4/26/23
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Hello, I'm trying to perform a QM/MM calculation with a protein-ligand complex, but I'm dealing with the following error:

[INFO ] calculating complex contribution... 0%| | 0/1001 [elapsed: 00:00 remaining: ?] File "/home/gabrielalima/anaconda3/envs/mmpbsa/bin/gmx_MMPBSA", line 8, in <module> sys.exit(gmxmmpbsa()) File "/home/gabrielalima/anaconda3/envs/mmpbsa/lib/python3.9/site-packages/GMXMMPBSA/app.py", line 101, in gmxmmpbsa app.run_mmpbsa() File "/home/gabrielalima/anaconda3/envs/mmpbsa/lib/python3.9/site-packages/GMXMMPBSA/main.py", line 203, in run_mmpbsa self.calc_list.run(rank, self.stdout) File "/home/gabrielalima/anaconda3/envs/mmpbsa/lib/python3.9/site-packages/GMXMMPBSA/calculation.py", line 131, in run calc.run(rank, stdout=stdout, stderr=stderr) File "/home/gabrielalima/anaconda3/envs/mmpbsa/lib/python3.9/site-packages/GMXMMPBSA/calculation.py", line 208, in run raise CalcError(f'{self.program} failed with prmtop {self.prmtop}!') CalcError: /home/gabrielalima/Downloads/amber20/bin/sander failed with prmtop COM.prmtop! Exiting. All files have been retained.

I have already performed the structure fit, removed the PBC, but it still hasn't solved the issue. The same input file with another complex worked perfectly.

The command I am using is:

gmx_MMPBSA -O -i ../../qmmm.in -cs 6_md.tpr -ci index.ndx -cg 1 13 -ct 6_md_fit.xtc -cp topol.top -nogui -o results.dat -eo results.csv

What could be wrong? I am sending the files attached and the trajectory file can be obtained here (https://drive.google.com/file/d/1lH8IUwa0NRyGapyzy5UANsWohYV2JSgT/view?usp=sharing).

Thank you in advance.

topol.top
qmmm.in
6_md.tpr
UNL_GMX.gro
UNL_GMX.itp

Mario Sergio Valdes

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Apr 26, 2023, 2:41:36 PM4/26/23
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Please, attach the gmx_MMPBSA.log file

Mario Sergio Valdes

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Apr 26, 2023, 4:39:18 PM4/26/23
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I think the problem is the protonation state of the ligand. As I see it, it only has a hydrogen atom added and nothing else. No carbon or nitrogen atom has full valences. The algorithm tries to add them but fails since this is completely inconsistent. Please check if the structure is correct
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