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There seem to be two conflicting demands here:

(1) How to best model a crystal structure for refinement against experimental data.

(2) How to present this model in an objective, generic way to convey something about the protein in the real (non-crystalline) world to non-specialists.

As the discussion shows, this is the best forum to discuss (1) and an NMR or EM forum will be the best place to discuss modelling issues with those techniques.

I don't think, however, that we're necessarily the experts in part (2), but rather, for example, the various curators of the PDB.

For instance, the MSD produce 'biological unit' files which are extremely useful for bioinformaticians, biochemists (and structural biologists for that matter). It's not that our refined PDB files don't encode that information already, just that we don't present it in an intuitive way in our refinement model. I don't see any obvious reason to change this.

I'm not sure that the issue of disordered side-chains is much different: if we work out how best to model (or not) these atoms for refinement, maybe the MSD folks etc. can determine the most appropriate, user-friendly way to intuitively present the information to non-specialists.

Cheers,
Charlie

--
Charlie Bond
Professorial Fellow
University of Western Australia
School of Biomedical, Biomolecular and Chemical Sciences
M310
35 Stirling Highway
Crawley WA 6009
Australia
[EMAIL PROTECTED]
+61 8 6488 4406

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