In fact, if you want the truth, what I now do is to download the sf.cif file, use ccp4i to regenerate the MTZ (with the same Free R-factor flags that the authors have used for structure refinement). Then feed that into Phenix for a few rounds of positional and temperature factor refinement with TLS (very few, I am not really re-refining the structure) and look at the resulting e.d. maps. If the structure is "old" then I get improved model statistics and (I assume) improved electron density maps.
Fred. > Message du 12/12/09 00:33 > De : "Eric Bennett" > A : [email protected] > Copie à : > Objet : Re: [ccp4bb] FW: pdb-l: Retraction of 12 Structures.... > > > Fred V wrote: > > >I personally like to visualise the electron density as well, > >however, I do think that a non-crystallographer will go through the > >trouble of downloading the structure factors, installing ccp4/coot > >etc. > > > >Fred. > > They shouldn't have to go through some of that trouble. Maps should > be deposited. > > Even if you have good crystallography knowledge can you exactly > reproduce the map the authors were looking at? Software algorithms > change over the years... the software version the authors used might > not even be compilable on modern systems... some authors may not > fully specify all software settings required to get the same map > (perhaps they used NCS but you have to re-determine the NCS > yourself)... etc. > > > > > -- > Eric Bennett, [email protected] > >
