Re: [ccp4bb] Off topic: PKa of protein-DNA complex.

2010-08-14 Thread John R Helliwell
Dear Yang, There are several. I also commend to you:- Crystallography Reviews, Volume 15, Issue 4 October 2009 , pages 231 - 259 An evaluation review of the prediction of protonation states in proteins versus crystallographic experiment  Authors: Stuart J. Fisher; James Wilkinson; Richard H.

Re: [ccp4bb] PEG in the pdb? zero occ

2010-08-14 Thread Eleanor Dodson
I agree that zero occupancy is a bit ugly, but useful when not sure whether you will ever see that LYS.. But I dont think it wlll displace bulk solvent - at least not in REFMAC where an atom with occ=0.0 will not contribute to the atom map. And I expect this is true for all other structure

Re: [ccp4bb] PEG in the pdb? zero occ

2010-08-14 Thread Edwin Pozharski
Perhaps I was confused by the refinement exclude keyword which explicitly says that atoms excluded from refinement will contribute to the mask calculation.  Thanks for the correction. I would still object to the zero-occupancy atoms on semantic grounds.  Partial occupancy means that an atom

Re: [ccp4bb] what is the scaling factor generally used when calculating R factor?

2010-08-14 Thread Pavel Afonine
Hi Hailiang, I posted this several times and here is another one.. The exact formula and all the related details are here: http://cci.lbl.gov/~afonine/FandR/Fmodel_and_Rfactor.pdf (there is a small typo in the formula found by Lothar, but I leave it for you to find -:) ) Also, here is