Dear Sir,

I energy optimised the polymer-protein structure using HYPERCHEM. The moment I 
created peptide bonds between them, the pdb was saved like the format mentioned 
previously. for eg;
HETATM    1  N          1    -24.998  12.703  12.925
> 
> HETATM    2  C          2    -24.749  12.813  11.460
> 
> HETATM    3  C          3    -24.428  11.438  10.881
> 
> HETATM    4  O          4    -25.267  10.544  11.131
> 
> HETATM    5  H          5    -25.225  13.528  13.462
> 
> HETATM    6  H          6    -25.636  13.216  10.970
> 
> HETATM    7  H          7    -23.903  13.478  11.291


So, if there is NO other way of using this type of pdb file in GROMACS; can you 
please suggest any other software where I can successfully make covalent bonds 
between the protein and polymer, optimise them under force-field algorithms and 
THEN use the pdb file in GROMACS? 
Eagerly awaiting your advise and reply!!!

>>>"What program did you use to create this new PDB file?  It looks like it 
>>>severely 
crippled the file, changing just about everything about it.  There is certainly 
no way to use this .pdb file, since there aren't even any residue names defined 
in it.

-Justin"
<<<<

Thanking you, 
Regards,
Anand


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