On 8 Jul 2011, at 19:13, Katherine Sippel wrote:

> I know that the PDB updated its validation server in May as described in 
> their news link but it seemed to indicate an increase in output options 
> rather than a change in criteria. Is anyone aware of  what changes were made 
> to the validation server in regards to the preferred geometrical and 
> stereochemical features?

As far as I can tell empirically, if I run the validation server today it 
complains about

a) waters which make a perfectly good contact with a residue in a different ASU

b) waters which make a perfectly good contact with metal ions or with other 
waters which themselves make a perfectly good contact with the protein.

and this means it's really not much use for validation of large complicated 
proteins with hundreds of waters.

Tom

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