Re: [gmx-users] add a group to an amino acid

2010-11-14 Thread hengame fallah
Dear Mark, I think that i couldn't explain my problem clearly, however i have changed my .rtp but i don't know how should be my .hdb file. a) The structure of *BOC* is: *-CO-CH2-CH(C6H5Cl)-CH2-NH-* b) This is the new charges: [ BOC ] [ atoms ] Nopls_238 -0.500 1 H

Re: [gmx-users] add a group to an amino acid

2010-11-14 Thread Mark Abraham
On 14/11/2010 7:26 PM, hengame fallah wrote: Dear Mark, I think that i couldn't explain my problem clearly, however i have changed my .rtp but i don't know how should be my .hdb file. a) The structure of *_BOC_* is: *-CO-CH2-CH(C6H5Cl)-CH2-NH-* Great. b) This is the new charges: [ BOC ]

[gmx-users] water molecules (interfacial) - IIRC

2010-11-14 Thread leila karami
Dear Mark I have a question as same as atila petrosian, but my system is protein-dna. you said [IIRC g_select has some better documentation available once you run it and ask for help, somewhat like make_ndx]. please explain IIRC more. Is IIRC a program or a list of archives? any help will

Re: [gmx-users] water molecules (interfacial) - IIRC

2010-11-14 Thread Mark Abraham
On 14/11/2010 7:57 PM, leila karami wrote: Dear Mark I have a question as same as atila petrosian, but my system is protein-dna. you said [IIRC g_select has some better documentation available once you run it and ask for help, somewhat like make_ndx]. please explain IIRC more. Is IIRC a

Re: [gmx-users] add a group to an amino acid

2010-11-14 Thread hengame fallah
I read about .hdb file and then i editted my .hdb file: ... BOC 9 11H N -CCA 26HA CA N CB 15HB CB CA CG1CG2 11HD1CD1CG1CE1 11HD2CD2CG1CE2 11HE1CE1CD1CZ 1

Re: [gmx-users] add a group to an amino acid

2010-11-14 Thread Mark Abraham
On 14/11/2010 8:13 PM, hengame fallah wrote: I read about .hdb file and then i editted my .hdb file: ... BOC 9 Then you'll know from your reading what this number should be :-) It's the number of types of hydrogen atoms that might be added. For each of them, there's one line below. You

Re: [gmx-users] 1-4 interaction, a distance greater than table size

2010-11-14 Thread Justin A. Lemkul
Amin Arabbagheri wrote: Dear All, I'm simulating a DNA duplex using amber99p. starting the simulation(step 0) i face an error which tells: starting mdrun 'Protein in water' 50 steps,500.0 ps. step 0Warning: 1-4 interaction between 136 and 179 at distance 96871502.536 which is

[gmx-users] water molecules (interfacial)

2010-11-14 Thread leila karami
Dear gromacs users I was trying to count waters involved in the interface between Protein_A and Protein_B. I made a selection.dat file as follows: waterO = group SOL and name OW; heavy1 = group Protein_A and group Protein-H; heavy2 = group Protein_B and group Protein-H; inter = waterO and

[gmx-users] Spurious results with pdb2gmx -chargegrp yes option

2010-11-14 Thread sa
Dear All, I would like to get little feedback of my findings/experience with recent simulations I did with the CHARMM force field in GROMACS and the -chargegroup options with pdb2gmx. I have performed two simulations with a helical peptide (25 AA) in a cubic box filled with explicit TIP3P water.

Re: [gmx-users] Converting between cartesian coordinates and torsion angles

2010-11-14 Thread Martin Kamp Jensen
Hi Mark, Thanks (again, again) for your input! On Fri, Nov 12, 2010 at 5:35 PM, Mark Abraham mark.abra...@anu.edu.auwrote: On 13/11/2010 12:49 AM, Martin Kamp Jensen wrote: Hi, As far as I understand, a topology (a .top file) and a conformation (e.g., a .gro file) contain enough

[gmx-users] Fwd: gmx-users Digest, Vol 79, Issue 102

2010-11-14 Thread Silvia Crivelli
We have a visualization tool that allows us to visualize the changes in the energy during energy minimization. The areas with more intense color are those where the atoms contribute the most to the total energy value. I just wrote a plug-in to use Gromacs for energy minimizations (or MD

Re: [gmx-users] Converting between cartesian coordinates and torsion angles

2010-11-14 Thread Mark Abraham
On 15/11/2010 4:13 AM, Martin Kamp Jensen wrote: Hi Mark, Thanks (again, again) for your input! On Fri, Nov 12, 2010 at 5:35 PM, Mark Abraham mark.abra...@anu.edu.au mailto:mark.abra...@anu.edu.au wrote: On 13/11/2010 12:49 AM, Martin Kamp Jensen wrote: Hi, As far as I