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Hi all, i am a new person for GROMACS. when I try to use tutorial 5(protein-ligand complex) I had some weird error in the topology and energy minimization part. originally my protein has 7 chains but I want to use only 2 chains of 7 chains. before to start gromacs I made some preprocess via chimera (I deleted solvent, ligand and other 5 chains). but when I try to make topol.top I got this error:
Fatal error:
Atom HB3 in residue MET 1 was not found in rtp entry MET with 19 atoms
while sorting atoms.
For a hydrogen, this can be a different protonation state, or it
might have had a different number in the PDB file and was rebuilt
(it might for instance have been H3, and we only expected H1 & H2).
Note that hydrogens might have been added to the entry for the N-terminus.
Remove this hydrogen or choose a different protonation state to solve it.
Option -ignh will ignore all hydrogens in the input.
and later on, I used -ignh but in that case my topol.top file does not seems well. it seems:
This is a standalone topology file
;
; Created by:
; :-) GROMACS - gmx pdb2gmx, 2021.4-Homebrew (-:
;
; Executable: /usr/local/bin/…/Cellar/gromacs/2021.4/bin/gmx
; Data prefix: /usr/local/bin/…/Cellar/gromacs/2021.4
; Working dir: /Users/…/Desktop/kodaMD
; Command line:
; gmx pdb2gmx -f …pdb -o …_processed.gro -ter -ignh
; Force field was read from the standard GROMACS share directory.
;
; Include forcefield parameters
#include “charmm27.ff/forcefield.itp”
; Include ligand parameters
#include “LIG.itp”
; Include chain topologies
#include “topol_Protein_chain_A.itp”
#include “topol_Protein_chain_B.itp”
; Include water topology
#include “charmm27.ff/tip3p.itp”
#ifdef POSRES_WATER
; Position restraint for each water oxygen
[ position_restraints ]
; i funct fcx fcy fcz
1 1 1000 1000 1000
#endif
; Include topology for ions
#include “charmm27.ff/ions.itp”
[ system ]
; Name
Protein in water
[ molecules ]
; Compound #mols
Protein_chain_A 1
Protein_chain_B 1
LIG 1
SOL 24721