[gmx-users] Citrate parameters

Mark Abraham mark.j.abraham at gmail.com
Fri Apr 12 17:47:29 CEST 2019


Hi,

It seems that all/most things before the [moleculetype] definition
duplicates the standard contents of the forcefield, as you can see from the
contents of the itp file and the original warnings you mentioned.
Unfortunately you now have the problem of determining whether all of it is
duplication, or only some of it.

Mark

On Fri., 12 Apr. 2019, 17:39 Pandya, Akash, <akash.pandya.15 at ucl.ac.uk>
wrote:

> Sorry but I don't quite understand where the duplicates come from? I've
> pasted my itp file below:
>
> [ defaults ]
> 1 2 yes 1.0 1.0
>
> [ atomtypes ]
> OC  8 15.9999 -0.760 A 0.302906 0.50208
> CC  6 12.0110  0.620 A 0.356359 0.29288
> HA  1  1.0080  0.090 A 0.235197 0.09205
> CT2 6 12.0110 -0.180 A 0.387541 0.23012
> CT  6 12.0110 -0.070 A 0.405359 0.08368
> OH1 8 15.9999 -0.540 A 0.315378 0.63639
> H   1  1.0080  0.310 A 0.040001 0.19623
>
> [ bondtypes ]
> CC     OC  1  0.126 439320.0
> CC     CT2 1  0.152 167360.0
> CT2    HA  1  0.111 258571.2
> OH1    H   1  0.096 456056.0
> CT     CC  1  0.152 167360.0
> CT2    CT  1  0.150 186188.0
> CT     OH1 1  0.142 358150.4
>
> [ angletypes ]
> OC    CC    OC  5 124.00   836.80   0.2225   58576.000
> OC    CC   CT2  5 118.00   334.72   0.2388   41840.000
> CC   CT2    HA  5 109.50   276.14   0.2163   25104.000
> HA   CT2    HA  5 109.00   297.06   0.1802    4518.720
> CT    CC    OC  5 118.00   334.72   0.2388   41840.000
> CT2   CT    CC  5 108.00   435.14   0.0000       0.000
> CT2   CT   CT2  5 113.60   488.27   0.2561    9338.688
> HA   CT2    CT  5 110.10   279.74   0.2179   18853.104
> CC   CT2    CT  5 108.00   435.14   0.0000       0.000
> CT2   CT   OH1  5 110.10   633.46   0.0000       0.000
> OH1   CT    CC  5 110.10   633.46   0.0000       0.000
> CT   OH1     H  5 106.00   481.16   0.0000       0.000
>
> [ dihedraltypes ]
> HA   CT2    CC   OC  9   180.00   0.2092 6
> CT   CT2    CC   OC  9   180.00   0.2092 6
> CT2   CT   CT2   CC  9     0.00   4.0000 3
> OH1   CT   CT2   CC  9     0.00   0.8368 3
> OH1   CT   CT2   HA  9     0.00   0.8368 3
> CC    CT   CT2   CC  9     0.00   0.8368 3
> CC    CT   CT2   HA  9     0.00   0.8368 3
> CT2   CT   CT2   HA  9     0.00   0.8368 3
> OH1   CT    CC   OC  9     0.00   1.2000 2
> CT2   CT    CC   OC  9   180.00   0.2092 6
> CC    CT   OH1    H  9     0.00   0.2092 1
> CT2   CT   OH1    H  9     0.00   0.5858 3
> CC   CT2    OC   OC  2     0.00  803.328
> CC    CT    OC   OC  2     0.00  803.328
>
> [ moleculetype ]
> CIT             3
>
> [ atoms ]
> 1   CC   1  CIT   C  1   0.620    12.011
> 2   CT2  1  CIT   C  2  -0.180    12.011
> 3   CT   1  CIT   C  3  -0.070    12.011
> 4   CC   1  CIT   C  4   0.620    12.011
> 5   CT2  1  CIT   C  5  -0.180    12.011
> 6   CC   1  CIT   C  6   0.620    12.011
> 7   OC   1  CIT   O  7  -0.760    15.999
> 8   OC   1  CIT   O  8  -0.760    15.999
> 9   OC   1  CIT   O  9  -0.760    15.999
> 10  OC   1  CIT   O 10  -0.760    15.999
> 11  OC   1  CIT   O 11  -0.760    15.999
> 12  OC   1  CIT   O 12  -0.760    15.999
> 13  OH1  1  CIT   O 13  -0.540    15.999
> 14  HA   1  CIT   H 14   0.090     1.008
> 15  HA   1  CIT   H 15   0.090     1.008
> 16  HA   1  CIT   H 16   0.090     1.008
> 17  HA   1  CIT   H 17   0.090     1.008
> 18  H    1  CIT   H 18   0.310     1.008
>
> [ bonds ]
> 1 8    1
> 1 7    1
> 1 2   1
> 2 15   1
> 2 14   1
> 2 3    1
> 3 13   1
> 3 5    1
> 3 4    1
> 4 10   1
> 4 9    1
> 5 17   1
> 5 16   1
> 5 6    1
> 6 12   1
> 6 11   1
> 13 18  1
> [ angles ]
> 8     1     7   5
> 8     1     2   5
> 7     1     2   5
> 1     2    15   5
> 15    2    14   5
> 15    2     3   5
> 1     2    14   5
> 14    2     3   5
> 1     2     3   5
> 2     3    13   5
> 13    3     5   5
> 13    3     4   5
> 2     3     5   5
> 5     3     4   5
> 2     3     4   5
> 3     4    10   5
> 10    4     9   5
> 3     4     9   5
> 3     5    17   5
> 17    5    16   5
> 17    5     6   5
> 3     5    16   5
> 16    5     6   5
> 3     5     6   5
> 5     6    12   5
> 12    6    11   5
> 5     6    11   5
> 3    13    18   5
>
> [ exclusions ]
> 18  9 10
>
> [ pairs ]
> 10 18 2 0.3 -0.760 0.310 0.17145 0.310857
> 9  18 2 0.3 -0.760 0.310 0.17145 0.310857
>
> [ dihedrals ]
> 8    1    2   15  9
> 7    1    2   15  9
> 8    1    2   14  9
> 7    1    2   14  9
> 8    1    2    3  9
> 7    1    2    3  9
> 1    2    3   13  9
> 15   2    3   13  9
> 14   2    3   13  9
> 1    2    3    5  9
> 15   2    3    5  9
> 14   2    3    5  9
> 1    2    3    4  9
> 15   2    3    4  9
> 14   2    3    4  9
> 2    3   13   18  9
> 5    3   13   18  9
> 4    3   13   18  9
> 2    3    5   17  9
> 13   3    5   17  9
> 4    3    5   17  9
> 2    3    5   16  9
> 13   3    5   16  9
> 4    3    5   16  9
> 2    3    5    6  9
> 13   3    5    6  9
> 4    3    5    6  9
> 2    3    4   10  9
> 13   3    4   10  9
> 5    3    4   10  9
> 2    3    4    9  9
> 13   3    4    9  9
> 5    3    4    9  9
> 3    5    6   12  9
> 17   5    6   12  9
> 16   5    6   12  9
> 3    5    6   11  9
> 17   5    6   11  9
> 16   5    6   11  9
>
> [ dihedrals ]
> 1  2  7     8     2
> 4  3  9     10    2
> 6  5  11    12    2
>
> #ifdef POSRES_CITMolecule
> [ position_restraints ]
> ; atom  type      fx      fy      fz
>    1 1 1000 1000 1000
>    2 1 1000 1000 1000
>    3 1 1000 1000 1000
>    4 1 1000 1000 1000
>    5 1 1000 1000 1000
>    6 1 1000 1000 1000
>    7 1 1000 1000 1000
>    8 1 1000 1000 1000
>    9 1 1000 1000 1000
>   10 1 1000 1000 1000
>   11 1 1000 1000 1000
>   12 1 1000 1000 1000
>   13 1 1000 1000 1000
>   14 1 1000 1000 1000
>   15 1 1000 1000 1000
>   16 1 1000 1000 1000
>   17 1 1000 1000 1000
>   18 1 1000 1000 1000
> #endif
>
> -----Original Message-----
> From: gromacs.org_gmx-users-bounces at maillist.sys.kth.se <
> gromacs.org_gmx-users-bounces at maillist.sys.kth.se> On Behalf Of Justin
> Lemkul
> Sent: 12 April 2019 16:14
> To: gmx-users at gromacs.org
> Subject: Re: [gmx-users] Citrate parameters
>
>
>
> On 4/12/19 10:52 AM, Pandya, Akash wrote:
> > Hi all,
> >
> > My simulation contains citrate molecules. When I try to solvate the
> system, I get this error. Can anybody help with this?
>
> Your citrate topology is introducing duplicate parameters that already
> exist in the force field. In this instance, they appear to be exact copies
> (at least for the bonded parameters shown) but this is bad practice.
> Eliminate the redundancies.
>
> -Justin
>
> > WARNING 1 [file CITff.itp, line 3]:
> >    Overriding atomtype OC
> >
> >
> > WARNING 2 [file CITff.itp, line 4]:
> >    Overriding atomtype CC
> >
> >
> > WARNING 3 [file CITff.itp, line 5]:
> >    Overriding atomtype HA
> >
> >
> > WARNING 4 [file CITff.itp, line 6]:
> >    Overriding atomtype CT2
> >
> >
> > WARNING 5 [file CITff.itp, line 7]:
> >    Overriding atomtype CT
> >
> >
> > WARNING 6 [file CITff.itp, line 8]:
> >    Overriding atomtype OH1
> >
> >
> > WARNING 7 [file CITff.itp, line 9]:
> >    Overriding atomtype H
> >
> >
> > WARNING 8 [file CITff.itp, line 13]:
> >    Overriding Bond parameters.
> >
> >    old:                                          0.1522 167360 0.1522
> 167360
> >    new: CC     CT2 1  0.152 167360.0
> >
> >
> > WARNING 9 [file CITff.itp, line 14]:
> >    Overriding Bond parameters.
> >
> >    old:                                          0.1111 258571 0.1111
> 258571
> >    new: CT2    HA  1  0.111 258571.2
> >
> >
> > WARNING 10 [file CITff.itp, line 23]:
> >    Overriding U-B parameters.
> >
> >    old:                                          109.5 276.144 0.2163
> 25104 109.5 276.144 0.2163 25104
> >    new: CC   CT2    HA  5 109.50   276.14   0.2163   25104.000
> >
> >
> > WARNING 11 [file CITff.itp, line 24]:
> >    Overriding U-B parameters.
> >
> >    old:                                          109 297.064 0.1802
> 4518.72 109 297.064 0.1802 4518.72
> >    new: HA   CT2    HA  5 109.00   297.06   0.1802    4518.720
> >
> > Generated 20503 of the 20503 non-bonded parameter combinations
> > Generating 1-4 interactions: fudge = 1 Generated 17396 of the 20503
> > 1-4 parameter combinations Excluding 3 bonded neighbours molecule type
> > 'Protein_chain_H'
> > Excluding 3 bonded neighbours molecule type 'CIT'
> > Excluding 3 bonded neighbours molecule type 'GLY'
> > Excluding 2 bonded neighbours molecule type 'SOL'
> >
> > NOTE 2 [file topol.top, line 62703]:
> >    System has non-zero total charge: -46.999995
> >    Total charge should normally be an integer. See
> >
> https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.gromacs.org%2FDocumentation%2FFloating_Point_Arithmetic&amp;data=02%7C01%7Cakash.pandya.15%40ucl.ac.uk%7C4504ba31ee1b4063a30d08d6bf59885e%7C1faf88fea9984c5b93c9210a11d9a5c2%7C0%7C0%7C636906788597905747&amp;sdata=oxvEKXN67Oq%2B2F2Wm4WQ0uPCtOZxTVsn%2Fv9hiF%2FGeCI%3D&amp;reserved=0
> >    for discussion on how close it should be to an integer.
> >
> >
> >
> > Removing all charge groups because cutoff-scheme=Verlet Analysing
> > residue names:
> > There are:  1366    Protein residues
> > There are:    23      Other residues
> > There are: 56714      Water residues
> > Analysing Protein...
> > Analysing residues not classified as Protein/DNA/RNA/Water and splitting
> into groups...
> > Number of degrees of freedom in T-Coupling group rest is 389088.00
> > Calculating fourier grid dimensions for X Y Z Using a fourier grid of
> > 104x104x104, spacing 0.120 0.120 0.120 Estimate for the relative
> > computational load of the PME mesh part: 0.19 This run will generate
> > roughly 14 Mb of data
> >
> > There were 2 notes
> >
> > There were 11 warnings
> >
> > -------------------------------------------------------
> > Program:     gmx grompp, version 2016.2
> > Source file: src/gromacs/gmxpreprocess/grompp.cpp (line 2325)
> >
> > Fatal error:
> > Too many warnings (11).
> > If you are sure all warnings are harmless, use the -maxwarn option.
> >
> > For more information and tips for troubleshooting, please check the
> > GROMACS website at
> > https://eur01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.g
> > romacs.org%2FDocumentation%2FErrors&amp;data=02%7C01%7Cakash.pandya.15
> > %40ucl.ac.uk%7C4504ba31ee1b4063a30d08d6bf59885e%7C1faf88fea9984c5b93c9
> > 210a11d9a5c2%7C0%7C0%7C636906788597905747&amp;sdata=WGY4ht%2BgVmeJ3bJX
> > YAg5Y7ciNSUk3MhMwkbnSnob%2F0I%3D&amp;reserved=0
> >
>
> --
> ==================================================
>
> Justin A. Lemkul, Ph.D.
> Assistant Professor
> Office: 301 Fralin Hall
> Lab: 303 Engel Hall
>
> Virginia Tech Department of Biochemistry
> 340 West Campus Dr.
> Blacksburg, VA 24061
>
> jalemkul at vt.edu | (540) 231-3129
>
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> ==================================================
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