On Fri, 4 Dec 2020 at 09:21, Luca Jovine <luca.jov...@ki.se> wrote:
>
> Yes Tristan, that would be even better - also because such an Ag1, Ag2,… 
> system could conveniently fall back on a single-character chain A, when 
> generating legacy PDB format files from the mmCIF ones.

mmCIF already has two sets of identifiers, including two separate
chain names (and both are present in all files from the wwPDB). The
one discussed here is auth_asym_id (author's chain ID - used in pdb
files), the other one is label_asym_id (let's call it label chain ID).
Having two sets of identifiers is obviously confusing (as can be seen
by just looking at any mmCIF file) and it'd help a lot if the two IDs
were consistent: the label chain ID could start with the corresponding
author's chain ID. For example, similarly to what Tristan proposed,
author's chain A could be split into label chains Amain, Ag1, Ag2,
etc.

Marcin

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