327 karma · joined March 19, 2020
https://en.wikipedia.org/wiki/Protein#/media/File:Chaperonin...
I'm working on making a model of this chaperone complex relative to a folded protein to get a sense of how it might be interacting with the amino acid chain before it becomes globular
"Except you know what’s weird? Although the absolute diversity of prokaryotes is widely held to be unknown and unknowable at any scale, most new genetic information we find in bacteria is similar to genetic information we’ve seen elsewhere. It’s a comforting reminder that, although large-grain diversity is uncountably large, most genes in diverse bacteria have sequence-based similarity. But when you sequence a sample of mixed viruses, most of that genetic information has never been seen before, anywhere. "
it's challenging to tell apart all of the pieces in a metagenomic sample except through assembly. A "viral plasmid" like you describe would go unnoticed simply because it would map to another sequence assembly.
there's indication of high copy-number plasmids in bacteria sometimes. not sure if anyone has looked to see if any of those are kept in the outside of the cell.
usually imaged cells are washed very well before imaging, otherwise background is off the charts...
It's possible that the super simple minimalist viruses are spontaneously produced and abundant in the universe. If all that's necessary is a strand of nucelic acids and a repetitive peptide unit, then it's within the realm of possibility that these would form simply because it's thermodynamically favorable for them to fall together in some systems. Then, if they encounter a living being, they're able to piggyback on it to multiply, mutate, and recombine.
This could be further supported by the fact that viruses can coinfect cells and effectively transfer genetic and protein material between each other.
By this model the simplest viruses are just products of chemistry that, when exposed to life, gradually become more and more complex.
I guess the underlying point is that they could very well be forming on earth, continuously. If they are, then that would explain the baffling, unending diversity. They're just always forming new genetic material that gets iterated on until it works well.