Re: [AMBER] Bad atom type

From: David A Case via AMBER <amber.ambermd.org>
Date: Mon, 24 Nov 2025 08:17:21 -0700

On Fri, Nov 21, 2025, Priyasha Majee via AMBER wrote:
>
>Kindly explain me this error and provide an elaborate explanation and
>fix.
>
>On 2025-11-20 19:35, Tomás Benjamín Cáceres Madariaga wrote:
>
>>Hi, this link contains relevant information about your issue.
>>http://archive.ambermd.org/202411/0053.html

Please see the link above, plus this one:

    http://archive.ambermd.org/202411/0054.html

But the real reason behind this situation is that Amber's GB model expects
ion effects to be handled by the implicit solvent model, and not by
including explicit ions. I undestand that there are reasons why one might
want to have explicit ions, but be aware that you are in largely uncharted
territory here.

You might want to read this paper:

%A E.S. Kolesnikov
%A Y. Xiong
%A A.V. Onufriev
%T Implicit Solvent with Explicit Ions Generalized Born Model in Molecular Dynamics: Application to DNA
%J J. Chem. Theory Comput.
%V 20
%P 8724-8739
%D 2024

and also look at Section 4.2 in the Amber 2025 Reference Manual.

...regards...dac


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Received on Mon Nov 24 2025 - 07:30:02 PST
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