proteinator.bsky.social
PhD candidate in bioinformatics
Protein structure prediction / Protein design
17 posts
23 followers
55 following
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🤡🤡🤡
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😂😂😂
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Ah yeah, didn’t fit into the previous post: there’s no bias in sec structure distro in the PDB. Also in the paper I attached above we have a plot showing the mean of PDB regards to hels and strands and of different gen models 😅
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Gen models just learn the locality of the helices very quickly and “cheat” on the metrics by overrepresenting helices. Especially for bigger proteins > 500 aas it really becomes apparent..
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Not sure it’s that easy. We recently proposed a checkpointing selection criterion (arxiv.org/abs/2411.05238) to match better the distribution of secondary structure elements of native proteins from PDB but it doesn’t seem to work too good.
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the consequence of that is pretty well known - rock-stable rigid proteins 🤠
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Keep me in the loop, I'd be interested in seeing it! We just need someone to run this multiple times xD However, my guess would be that strands will approach 0% on avg in this setup.
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Typically gen models for protein structure are mode collapsed towards alpha-helices, AF3 won't be an exception here either if used in such a way. The reason why it hallucinates helices is just simply they're easy to learn as an optimal minimization of the diffusion loss fct during training
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That's an interesting assumption though I don't think this will work for something bigger than let's say 150-200aa. And clearly it will hallucinate helical bundles just arranged in slightly (maybe not) different topologies. Not sure it's of any meaning 😅
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I'm not sure I'm following. How is it useful if seq -> str mapping is not guaranteed anymore? This puts the equality sign between random seq and pMPNN generated seq
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yeah, doesn't change the thing. There should be just an alternative, non-static encoding of protein structures. Maybe as a multivariate energy (not in the physical sense) landscape of protein conformations 😀
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Well, it clearly shows the over-reliance on conformations of crystal structures. I guess training should include some probability distros of protein structures accounting for dynamics, though it's obviously a non-trivial problem to solve..
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Looks like recursion sneaked in 😂
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what is this 😅 ...
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At least it's encouraging to see that the old but gold SE(3) eq architecture outperforms all atom diffusion models in the low RNA structure data regime 😀
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As promised on twitter - only horses 😂