[ccp4bb] [OT]:Typoglycemia

2015-01-30 Thread Bernhard Rupp (Hofkristallrat a.D.)
Today, after 6 years in circulation, John Tesmer kindly informed me about a labelling error in BMC figure 6-17 http://www.ruppweb.org/Garland/gallery/Ch6/pages/Biomolecular_Crystallograph y_Fig_6-17.htm I think the reason that nobody has noticed it until now is perhaps (in addition to the fac

[ccp4bb] How to apply NCS restraint to a ligand in refmac?

2015-01-30 Thread Ethan A Merritt
Is there some way to apply NCS restraints to the binding pose of a ligand during refmac refinement? That is, suppose I have 3 copies of the binding site and the density in each copy is OK but not great. I would be more confident of a refined pose that jointly satisfied the electron density at all

Re: [ccp4bb] How to apply NCS restraint to a ligand in refmac?

2015-01-30 Thread Jurgen Bosch
Hi Ethan, DM with a mask of the ligand in chain A then applying the NCS matrices and looking at the resulting density perhaps ? Theoretically it should improve, this is of course assuming that your ligand does not adopt different conformations in the three chains. In Refmac you can also add a NCS

Re: [ccp4bb] How to apply NCS restraint to a ligand in refmac?

2015-01-30 Thread Ethan A Merritt
On Saturday, 31 January, 2015 00:51:08 Jurgen Bosch wrote: > Hi Ethan, > DM with a mask of the ligand in chain A then applying the NCS matrices and > looking at the resulting density perhaps ? Real-space refinement is not the issue. That can be done easily in Coot by calculating an NCS-averaged m

Re: [ccp4bb] How to apply NCS restraint to a ligand in refmac?

2015-01-30 Thread Edward A. Berry
Include the ligand residue in the NCS restraint-group to which the surrounding protein residues belong? On 01/30/2015 08:24 PM, Ethan A Merritt wrote: On Saturday, 31 January, 2015 00:51:08 Jurgen Bosch wrote: > Hi Ethan, > DM with a mask of the ligand in chain A then applying the NCS matri