Add ribbon representation in structure viewer

[Luthaf]

This is a popular representation for bio-molecules, in particular proteins, supported by both JSmol and 3Dmol.js. Two separate people asked for us to support this!

This kind of representation requires some information about the secondary structure, which we would need to add to the input file. I'm not sure which exact information is required to construct the ribbon, I would guess the list and order of alpha carbons in amino-acids? If you have more information on the subject, please let us know!

[ceriottm]

would make sense to only do this after we converge on jsmol vs 3dmol.js though

On Thu, 15 Apr 2021 at 18:33, Guillaume Fraux @.***> wrote:

This is a popular representation for bio-molecules, in particular proteins, supported by both JSmol and 3Dmol.js. Two separate people asked for us to support this!

This kind of representation requires some information about the secondary structure, which we would need to add to the input file. I'm not sure which exact information is required to construct the ribbon, I would guess the list and order of alpha carbons in amino-acids? If you have more information on the subject, please let us know!

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[Luthaf]

Agreed! I'm opening the issue to keep track of it.

With a bit more research, it looks like we need to have secondary structure assignment for atoms (i.e. is this atom part of an helix, a beta strand, etc.). There is some code to guess the secondary structure in 3Dmol: https://github.com/3dmol/3Dmol.js/blob/17aa414914b0898e4089436524c89cf875505307/3Dmol/parsers.js#L310. Alternatively, we can put this data inside the input JSON, and guess/compute it when generating the JSON file.