If we define high resolution as 1.2A and higher, there are ~1500 high-resolution entries (ignoring entries without experimental data). Of these ~1000 were refined with anisotropic B-factors by our method. We use the Hamilton R-ratio test to support our B-factor model choice. The ~1000 is an underestimate because the B-factor model used wasn't stored properly for the older entries. If more accurate numbers are needed, they can be mined from the PDB_REDO databank.
HTH, Robbie Joosten Netherlands Cancer Institute www.cmbi.ru.nl/pdb_redo > Date: Thu, 11 Oct 2012 12:17:39 -0700 > From: merr...@u.washington.edu > Subject: Re: [ccp4bb] anisotropic refinement > To: CCP4BB@JISCMAIL.AC.UK > > On Thursday, October 11, 2012 11:50:37 am Rex Palmer wrote: > > Dear CCP4'ers > > With the occurrence of more and more high resolution protein structures > > does anyone know at present how many such structures have been successfully > > refined anisotropicall?� > > When we tried to categorize refinement protocols in the PDB at the end > of 2009 we identified about 1200 protein structures that had been given > full anisotropic treatment. Zucker et al, Acta Cryst. (2010). D66, 889–900 > > However, using automated search of the PDB it is hard to distinguish > full aniso refinement from structures refined with TLS but having missing > or malformed TLS records. > > As to "successfully", that's a separate question :-) > May Robbie Joosten has more recent numbers from the PDB-Redo project, > and a comment on success? > > Ethan > > -- > Ethan A Merritt > Biomolecular Structure Center, K-428 Health Sciences Bldg > University of Washington, Seattle 98195-7742