[gmx-users] problem with make_ndx

[Mark Abraham]

On 1/02/2012 6:25 PM, Anushree Tripathi wrote:
> But in coordinate file(.pdb file) ,I am not getting the atoms which 
> belongs to DPPC.

You cannot do anything unless you have a coordinate file that includes 
DPPC coordinates. I don't know how to express this any more clearly.

> only I have included the name of dppc.itp file like this:
> ;Include DPPC chain topology
> #include "dppc.itp"
>
> That's why I have found the atoms wich belongs to DPPC molecule from 
> dppc.itp file itself.

These numbers are not useful, as I have already explained.

Mark

>
>
> On Wed, Feb 1, 2012 at 12:40 PM, Mark Abraham <Mark.Abraham at anu.edu.au 
> <mailto:Mark.Abraham at anu.edu.au>> wrote:
>
>     On 1/02/2012 6:04 PM, Anushree Tripathi wrote:
>>     When I run the command (i.e., make_ndx -f em.gro -o index.ndx)
>>     ,it is showing the following options:
>>      0 System              : 18379 atoms
>>       1 Protein             : 11739 atoms
>>       2 Protein-H           :  9135 atoms
>>       3 C-alpha             :  1173 atoms
>>       4 Backbone            :  3519 atoms
>>       5 MainChain           :  4693 atoms
>>       6 MainChain+Cb        :  5773 atoms
>>       7 MainChain+H         :  5842 atoms
>>       8 SideChain           :  5897 atoms
>>       9 SideChain-H         :  4442 atoms
>>      10 Prot-Masses         : 11739 atoms
>>      11 non-Protein         :  6640 atoms
>>      12 Water               :  6636 atoms
>>      13 SOL                 :  6636 atoms
>>      14 non-Water           : 11743 atoms
>>      15 Ion                 :     4 atoms
>>      16 CL                  :     4 atoms
>>      17 Water_and_ions      :  6640 atoms
>
>     So your system has 18K atoms, with 11K protein and the rest
>     solvent and ions. As Justin suggested, this coordinate file does
>     not have DPPC in it.
>
>
>
>>     for my work, I used 16|13 then 1|11.lastly I saved it using
>>     'q'.But there is no option for DPPC (as given in tutorial we have
>>     to merge protein with DPPC).After runing the command (grompp -f
>>     nvt.mdp -c em.gro -p topol.top -n index.ndx -o nvt.tpr),it is
>>     showing error:
>>
>>     Group DPPC not found in indexfile.
>>     Maybe you have non-default goups in your mdp file, while not
>>     using the '-n' option of grompp.
>>     In that case use the '-n' option.
>>
>>     To troubleshoot the error,I have kept one more group in index.ndx
>>     file with number of atoms which I found from dppc.itp file(at the
>>     end of file) like this
>>
>>     [DPPC]
>>     1    2    3    4    5    6    7    8    9   10   11   12   13  
>>     14   15
>>     16   17   18   19   20   21   22   23   24   25   26   27   28  
>>     29   30
>>     31   32   33   34   35   36   37   38   39   40   41   42   43  
>>     44   45
>>     46   47   48   49   50
>
>     These numbers have to reference the atom numbers in the coordinate
>     file, not the [moleculetype]. Since you've done the latter, you
>     get the problem with T-coupling groups. But go back and use a
>     coordinate file that actually has DPPC in it.
>
>     Mark
>
>
>>
>>     Again after running the grompp command (grompp -f nvt.mdp -c
>>     em.gro -p topol.top -n index.ndx -o nvt.tpr),I am getting the
>>     following error:
>>
>>     Atom 1 in multiple T-Coupling groups (1 and 2).
>>
>>     Please suggest me the reason as well as solution for this problem.
>>
>>
>
>
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