Re: Bad structure after converting the coarse grained last frame to all-atom

From: Peter Freddolino (
Date: Tue Sep 18 2018 - 12:26:59 CDT

It looks like the do_rotations argument is set by default in the gui, but
just to confirm, could you try doing the reversal via the text interface
(see for
directions). Be sure to specify the value 1 for the do_rotations argument,
which should do its best to minimize the perturbations to the reversed
structure. Also, are you trying to reverse cg the water and ions? I would
not recommend doing so, but rather, reversing the lipid/protein and then

On Tue, Sep 18, 2018 at 11:58 AM, Rabeta Yeasmin <>

> Dear Mr. Peter,
> I have used CG Builder GUI in VMD to reverse the coarse-grained molecule.
> That did not ask me to set do_rotations argument. And my system contains
> two protein, POPC and POPG lipid, water and ions. I have used the RBCG
> model that is provided in VMD 1.9.2 as plugins. I think it is the old RBCG
> model from 2007.
> Thanks.
> Rabeta Yeasmin
> On Mon, Sep 17, 2018 at 3:58 PM Peter Freddolino <>
> wrote:
>> Can you please clarify the precise command that you used to reverse
>> coarse grain the molecule? Did you have the do_rotations argument set? What
>> does your system contain?
>> Also, what CG model are you using? I would hope a recent martini version
>> and not the old RBCG model from 2007, unless you're trying to precisely
>> reproduce one of those old papers...
>> Best,
>> Peter
>> On Mon, Sep 17, 2018 at 12:50 PM, Rabeta Yeasmin <
>> > wrote:
>>> Dear NAMD users,
>>> I have run some coarse-grained simulation of a protein-lipid system in
>>> NAMD using residue-based coarse-grained simulation. After running 500ns, I
>>> have converted back the last structure of coarse-grained simulation to the
>>> all-atom system. But the structure has a lot of stretching. And during the
>>> minimization of the converted structure, it showed a lot f warning like-
>>> Warning: Tuple 540098 with atoms 20552(159) 20548(159) missing patch 129
>>> I have tried another way to overcome this kind of problem. I have
>>> minimized the last structure of coarse-grained simulation before
>>> converting it to the all-atom system. But that did not work too. Can you
>>> please suggest me what can cause this kind of problem?
>>> Thanks.
>>> Rabeta Yeasmin

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