Re: [AMBER] Help with imagining curled protein

From: Matthew Guberman-Pfeffer <matthew.guberman-pfeffer.uconn.edu>
Date: Wed, 14 Jul 2021 11:11:43 -0400

Hello Dan,

Thanks for the reply. I’ve tried autoimage. I’ve also tried specifying the middle domain, or all three domains as the anchor. None of that worked. I’d be glad to share the trajectory if you’d like to take a look.

If imaging or autoimaging results in a “broken” structure, how would distance imaging as part of an analysis function not result in the same “broken” structure?

Best,
Matthew


> On Jul 13, 2021, at 1:06 PM, Daniel Roe <daniel.r.roe.gmail.com> wrote:
>
> *Message sent from a system outside of UConn.*
>
>
> Hi,
>
> Try 'autoimage' and see if that works for you. You can use it as-is,
> or try specifying different expressions for the anchor mask.
>
> This will only affect calculations that don't automatically perform
> distance imaging. The 'hbond' calculation has imaging off by default,
> but it can be turned on. Most calculations will automatically image
> distances anyway - check the description in the manual to be certain.
>
> -Dan
>
> On Tue, Jul 13, 2021 at 10:00 AM Matthew Guberman-Pfeffer
> <matthew.guberman-pfeffer.uconn.edu <mailto:matthew.guberman-pfeffer.uconn.edu>> wrote:
>>
>> Dear Amber Community,
>>
>> My fairly straight, filamentous protein curled during dynamics, and I’m struggling to find a way to image it back into the box, if possible. I want to post-process the energetics with an implicit solvent, but I’m concerned that the results will be meaningless unless I figure out how to image the protein correctly. Because it’s a homotrimeric complex, I’ve tried the below script for imaging in cpptraj
>>
>> parm xxx.parm7
>> reference xxx.rst7
>> trajin xxx.mdcrd
>> trajout yyy.mdcrd
>>
>> center :1-282 mass origin #domain 1
>> image origin center
>> center :1-564 mass origin #domain 1-2
>> image origin center
>> center :1-846 mass origin #domain 1-3
>> image origin center
>>
>> But I still get the below (figures attached from 2 different frames). What can/should I try? How much of this issue is a visualization problem and won’t affect a non-periodic (implicit solvent) calculation?
>>
>> Best regards,
>> Matthew
>>
>>
>>
>>
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Received on Wed Jul 14 2021 - 08:30:02 PDT
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