[chimerax-users] ChimeraX AlphaFold2

[Roden Deng Luo]

(The original text was with white front color. It shows up for me once the
texts are selected... )

Come in to just say that the alphafold2 multimer is still under active
debugging. We had faced issue #227
<https://github.com/deepmind/alphafold/issues/227> and it is solved days
ago. But we are now facing issue #236
<https://github.com/deepmind/alphafold/issues/236> frequently, mostly with
multimers whose total length exceeds 1000 amino acids. From the discussion,
these clashes are also seen in the Colab version. The developer says "We
think we may have identified the issue with overlapping domains but need to
test a bit more. It will take us a few days at least to be sure." With the
current version, it will probably waste a lot of computing time. So one
might want to hold the integration to ChimeraX until #236 is solved.

Best,
Roden


On Mon, Nov 15, 2021 at 10:32 PM Tom Goddard via ChimeraX-users <
chimerax-users at cgl.ucsf.edu> wrote:

> ChimeraX does not yet allow running AlphaFold-Multimer the version of
> AlphaFold released November 2, 2021 that can predict structures for
> molecular assemblies.  We want to offer this, although a ChimeraX version
> will only be a slight convenience over running an AlphaFold-Multimer Google
> Colab notebook with a web browser without ChimeraX.
>
> The ChimeraX Google Colab AlphaFold predictions are limited in how long a
> sequence they can handle to about 800-1000 amino acids.   This  is because
> the old Google Colab GPUs (Nvidia K80 and T4) have only 16 Gbytes of memory
> and AlphaFold runs out of memory.  When you predict a molecular assembly
> with AlphaFold-Multimer, the sum of all sequence lengths will have the same
> limit.  So only small assemblies will be possible.  To predict longer
> sequences or larger assemblies you need a GPU with more memory such as an
> Nvidia A100 with 80 Gbytes, or an A40 with 48 Gbytes.  I don't know if
> Google Colab offers or will offer those in the future.  I am currently
> working on running AlphaFold-Multimer on the UCSF cluster with A40 GPUs to
> see how well it works and what sequence length it can handle.  The memory
> use is said to increase as the square of the sequence length.  We are
> looking at whether ChimeraX could run AlphaFold  predictions on the UCSF
> Wynton cluster but we probably do not have the budget to pay for that since
> it would probably cost about $100,000 per year to maintain about 16
> high-end GPUs to meet the demand of ChimeraX users.  So we are still
> figuring out what AlphaFold services ChimeraX can offer.
>
> Tom
>
> On Nov 15, 2021, at 9:13 AM, Eric Pettersen via ChimeraX-users <
> chimerax-users at cgl.ucsf.edu> wrote:
>
> Not sure why this text does not show up in the text of the message but
> only in the summary shown by Mail.app, but apparently the text of the
> message should be:
>
>
>
> On Nov 14, 2021, at 9:48 PM, Ichcharisma via ChimeraX-users <
> chimerax-users at cgl.ucsf.edu> wrote:
>
> Hi ChimeraX Dev
>
> I wondering if I can run oligomer prediction on ChimeraX AlphaFold
> features. As we can do it with others colabfold version out there.
> Thank you
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