Re: [AMBER] high value in MMPBSA

From: Ray Luo, Ph.D. <ray.luo.uci.edu>
Date: Tue, 8 May 2012 09:43:49 -0700

Most likely the files were generated wrong, can you properly visualize
all the water-free files in VMD?

Ray

On Tue, May 8, 2012 at 8:56 AM, 21119012 <21119012.zju.edu.cn> wrote:
> Hi Bill,
>
> Thank you for your reply. The problem has just been resolved.
>
> In general namelist variables of MMPBSA.py, "strip_mask" means the variable that specifies which atoms are stripped from the trajectory. Default = ":WAT:Cl-:CIO:Cs+:IB:K+:Li+:MG2:Na+:Rb+". That is, MG2 will be removed from trajectory by MMPBSA.py when trajin initial mdrcd file for later energy calculation.
>
> There is a MG2 in my system which is stripped out by PTRAJ so the produced mdcrd files become inconsistent with the corresponding prmtop files. This is the reason for my case.
>
> Solution: add the following to the "mmpbsa.in" file:
> strip_mask=":WAT:Cl-:CIO:Cs+:IB:K+:Li+:Na+:Rb+"
> You may find MG2 is not included here.
>
> Thanks again.
>
> Cao Yang,
> Zhejiang University, China
>
>
>
>>From: Bill Miller III <brmilleriii.gmail.com>
>>Reply-To: AMBER Mailing List <amber.ambermd.org>
>>To: xiaojiong <xiaojiong.zju.edu.cn>,AMBER Mailing List <amber.ambermd.org>
>>Subject: Re: [AMBER] high value in MMPBSA
>>Date: Tue, 8 May 2012 07:51:08 -0400
>>
>>As the error message suggests, there appears to be inconsistencies with the parameters among your different topology files. I would suggest recreating your dry complex, receptor, and ligand prmtops from your solvated complex prmtop using ante-MMPBSA.py or parmed.py.
>>
>>
>>I hope that helps.
>>
>>-Bill
>>
>>
>>
>>On May 8, 2012, at 5:34 AM, "xiaojiong"
>  wrote:
>>
>>> Hi,
>>>
>>> I came across a problem in MMPBSA calculation recently. The binding free energy is extremely high especially for the VDWAALS and 1-4 VDW part.
>>> I examine the "_MMPBSA_complex.pdb" file in VMD and find that the structure of the ligand crushes while the amino acids are OK.
>>> I guess there are some inconsistencies between the prmtop file and the trajectories of the ligand. But I couldn't figure out the point. Could you give me some suggestions?
>>>
>>> Here is the "FINAL_RESULTS_MMPBSA.dat" file:
>>>
>>> |Input file:
>>> |--------------------------------------------------------------
>>> |Input file for running PB and GB
>>> |&general
>>> |   startframe=201, verbose=1,
>>> |#  entropy=1,
>>> |/
>>> |&gb
>>> |  igb=2, saltcon=0.100
>>> |/
>>> |&pb
>>> |  istrng=0.100,
>>> |/
>>> |
>>> |
>>> |--------------------------------------------------------------
>>> |Solvated complex topology file:  3BWY_neg_lut5_LYN_SAM.prmtop
>>> |Complex topology file:           3BWY_neg_lut5_LYN_SAM_nosolv.prmtop
>>> |Receptor topology file:          3BWY_neg_lut5_LYN_SAM_noH_nolut.prmtop
>>> |Ligand topology file:            neg_luteolin5.prmtop
>>> |Initial mdcrd(s):                production3.mdcrd
>>> |
>>> |Best guess for receptor mask:   ":1-216"
>>> |Best guess for  ligand  mask:   ":217"
>>> |Ligand residue name is "LUT"
>>> |
>>> |Calculations performed using 200 frames.
>>> |Poisson Boltzmann calculations performed using internal PBSA solver in sander.
>>> |
>>> |All units are reported in kcal/mole.
>>> -------------------------------------------------------------------------------
>>> -------------------------------------------------------------------------------
>>>
>>> GENERALIZED BORN:
>>>
>>>
>>>
>>> WARNING: INCONSISTENCIES EXIST WITHIN 1-4 NON-BONDED TERMS.
>>>         CHECK YOUR INPUT FILES AND SYSTEM SETUP. THESE RESULTS MAY NOT BE RELIABLE (check differences)!
>>>
>>> The most common cause of this is inconsistent charge definitions across topology files.
>>> Complex:
>>> Energy Component            Average              Std. Dev.   Std. Err. of Mean
>>> -------------------------------------------------------------------------------
>>> VDWAALS        21006150336550031360.0000 212017833520375070720.0000 15029545730918023168.0000
>>> EEL                      -7468.4040             1236.3948             87.6457
>>> 1-4 VDW        4282229701684408877056.0000 42099142055861577318400.0000 2984329055037626515456.0000
>>> 1-4 EEL                    982.2488              968.2529             68.6376
>>> EGB                      -5610.6208              465.7548             33.0165
>>> ESURF                       55.2802                2.3492              0.1665
>>>
>>> G gas          4303235852020958101504.0000 42097542547851609899008.0000 2984215668921074188288.0000
>>> G solv                   -5555.3406              465.9751             33.0321
>>>
>>> TOTAL          4303235852020958101504.0000 42097542547851609899008.0000 2984215668921074188288.0000
>>>
>>>
>>> Receptor:
>>> Energy Component            Average              Std. Dev.   Std. Err. of Mean
>>> -------------------------------------------------------------------------------
>>> VDWAALS        21005544796506038272.0000 212017893069718487040.0000 15029549952259053568.0000
>>> EEL                      -7695.4620             1235.8941             87.6102
>>> 1-4 VDW        4281985119177865691136.0000 42099166792161559576576.0000 2984330808547440328704.0000
>>> 1-4 EEL                   1443.2652              958.3304             67.9342
>>> EGB                      -5608.2873              478.6512             33.9307
>>> ESURF                       55.9342                2.4598              0.1744
>>>
>>> G gas          4302990663974364119040.0000 42097567469026228043776.0000 2984217435536303325184.0000
>>> G solv                   -5552.3531              478.9203             33.9498
>>>
>>> TOTAL          4302990663974364119040.0000 42097567469026228043776.0000 2984217435536303325184.0000
>>>
>>>
>>> Ligand:
>>> Energy Component            Average              Std. Dev.   Std. Err. of Mean
>>> -------------------------------------------------------------------------------
>>> VDWAALS        141210847715258.3125 1666571428388523.0000 118140116238851.9688
>>> EEL                        252.6849               97.0809              6.8819
>>> 1-4 VDW        244582506544392416.0000 3440575681575656960.0000 243895943507772832.0000
>>> 1-4 EEL                   -461.0165               83.8380              5.9431
>>> EGB                       -164.6754               30.2935              2.1475
>>> ESURF                        2.6234                0.2556              0.0181
>>>
>>> G gas          244723717392107936.0000 3440566046845218816.0000 243895260519840544.0000
>>> G solv                    -162.0521               30.3183              2.1492
>>>
>>> TOTAL          244723717392107904.0000 3440566046845219328.0000 243895260519840576.0000
>>>
>>>
>>> Differences (Complex - Receptor - Ligand):
>>> Energy Component            Average              Std. Dev.   Std. Err. of Mean
>>> -------------------------------------------------------------------------------
>>> VDWAALS        464329196269944.4375 6456047927338494.0000 457657103432328.0625
>>> EEL                        -25.6269              102.8246              7.2890
>>> 1-4 VDW                   -488.0288             4686.7461            332.2346
>>> 1-4 EEL                     -0.0000                0.0001              0.0000
>>> EGB                        162.3420               79.1399              5.6101
>>> ESURF                       -3.2774                0.9013              0.0639
>>>
>>> DELTA G gas    464329196191104.1875 6456047927344164.0000 457657103432730.0000
>>> DELTA G solv               159.0645               79.0900              5.6065
>>>
>>>
>>> DELTA G binding = 464329196191261.6875 +/- 6456047927344175.0000   457657103432730.8125
>>>
>>>
>>> -------------------------------------------------------------------------------
>>> -------------------------------------------------------------------------------
>>>
>>> POISSON BOLTZMANN:
>>>
>>>
>>>
>>> WARNING: INCONSISTENCIES EXIST WITHIN 1-4 NON-BONDED TERMS.
>>>         CHECK YOUR INPUT FILES AND SYSTEM SETUP. THESE RESULTS MAY NOT BE RELIABLE (check differences)!
>>>
>>> The most common cause of this is inconsistent charge definitions across topology files.
>>> Complex:
>>> Energy Component            Average              Std. Dev.   Std. Err. of Mean
>>> -------------------------------------------------------------------------------
>>> VDWAALS        21006150336550055936.0000 212017833520375234560.0000 15029545730918033408.0000
>>> EEL                      -7468.4040             1236.3948             87.6457
>>> 1-4 VDW        4282229701684408877056.0000 42099142055861577318400.0000 2984329055037626515456.0000
>>> 1-4 EEL                    982.2488              968.2529             68.6376
>>> EPB                      -4320.4560              369.9319             26.2238
>>> ECAVITY                     53.0443                0.8530              0.0605
>>>
>>> G gas          4303235852020958101504.0000 42097542547851609899008.0000 2984215668921074188288.0000
>>> G solv                   -4267.4117              369.6239             26.2019
>>>
>>> TOTAL          4303235852020958101504.0000 42097542547851609899008.0000 2984215668921074188288.0000
>>>
>>>
>>> Receptor:
>>> Energy Component            Average              Std. Dev.   Std. Err. of Mean
>>> -------------------------------------------------------------------------------
>>> VDWAALS        21005544796506054656.0000 212017893069718683648.0000 15029549952259067904.0000
>>> EEL                      -7695.4620             1235.8941             87.6102
>>> 1-4 VDW        4281985119177865691136.0000 42099166792161559576576.0000 2984330808547440328704.0000
>>> 1-4 EEL                   1443.2652              958.3304             67.9342
>>> EPB                      -4348.3379              384.4561             27.2534
>>> ECAVITY                     53.2268                0.8828              0.0626
>>>
>>> G gas          4302990663974364119040.0000 42097567469026228043776.0000 2984217435536303325184.0000
>>> G solv                   -4295.1110              384.1966             27.2350
>>>
>>> TOTAL          4302990663974364119040.0000 42097567469026228043776.0000 2984217435536303325184.0000
>>>
>>>
>>> Ligand:
>>> Energy Component            Average              Std. Dev.   Std. Err. of Mean
>>> -------------------------------------------------------------------------------
>>> VDWAALS        141210847715258.4062 1666571428388523.7500 118140116238852.0312
>>> EEL                        252.6849               97.0809              6.8819
>>> 1-4 VDW        244582506544392416.0000 3440575681575656960.0000 243895943507772832.0000
>>> 1-4 EEL                   -461.0165               83.8380              5.9431
>>> EPB                       -143.9965               26.3195              1.8657
>>> ECAVITY                      1.8704                0.3239              0.0230
>>>
>>> G gas          244723717392107936.0000 3440566046845218816.0000 243895260519840544.0000
>>> G solv                    -142.1260               26.3208              1.8658
>>>
>>> TOTAL          244723717392107904.0000 3440566046845219328.0000 243895260519840576.0000
>>>
>>>
>>> Differences (Complex - Receptor - Ligand):
>>> Energy Component            Average              Std. Dev.   Std. Err. of Mean
>>> -------------------------------------------------------------------------------
>>> VDWAALS        464329196269953.1875 6456047927338652.0000 457657103432339.3125
>>> EEL                        -25.6269              102.8246              7.2890
>>> 1-4 VDW                   -488.0288             4686.7461            332.2346
>>> 1-4 EEL                     -0.0000                0.0001              0.0000
>>> EPB                        171.8783               85.5514              6.0646
>>> ECAVITY                     -2.0530                0.3528              0.0250
>>>
>>> DELTA G gas    464329196191114.7500 6456047927344320.0000 457657103432741.0625
>>> DELTA G solv               169.8253               85.5208              6.0624
>>>
>>>
>>> DELTA G binding = 464329196191280.3750 +/- 6456047927344334.0000   457657103432742.0625
>>>
>>>
>>> -------------------------------------------------------------------------------
>>> -------------------------------------------------------------------------------
>>>
>>> Cao Yang,
>>> Zhejiang University, China
>>>
>>> _______________________________________________
>>> AMBER mailing list
>>> AMBER.ambermd.org
>>> http://lists.ambermd.org/mailman/listinfo/amber
>>
>>_______________________________________________
>>AMBER mailing list
>>AMBER.ambermd.org
>>http://lists.ambermd.org/mailman/listinfo/amber
>>
>>
> _______________________________________________
> AMBER mailing list
> AMBER.ambermd.org
> http://lists.ambermd.org/mailman/listinfo/amber

_______________________________________________
AMBER mailing list
AMBER.ambermd.org
http://lists.ambermd.org/mailman/listinfo/amber
Received on Tue May 08 2012 - 10:00:04 PDT
Custom Search