Dear Jan,

You statistics look quite solid.

R-factors are not good criteria to judge the resolution cut-off. The weighting 
schemes in refinement programs have much improved since the late 1990s. A good 
starting point to learn more is 
Rupp's "Against Method: Table 1 -Cui Bono?", https://doi.org/10.1016/j.str.
2018.04.013

Best regards,
Tim

On Tuesday, April 16, 2019 6:57:06 PM CEST Jan van Agthoven wrote:
> Hi everyone,
> I’m trying to publish two structures at 3.1Å resolution with the following
> refinement statistics:
> 
> Resolution range (Å)                           49.2-3.1                     
>             49.3-3.1 Rfactor (%)                                           
> 24.0 (32.4)                              23.4 (32.0) Rfree (%)             
>                                 26.6 (29.2)                             
> 26.3 (31.6)
> 
> Data collection
> Completeness                                      100 (100)                 
>               100 (100)
> 
> Redundancy                                        6.9 (7.0)                 
>                 6.2 (6.3)
> 
> Molecules in asymmetric unit              1                                 
>             1
> 
> Average I/σ                                         14.1 (1.7)              
>                  15.3 (2.0)
> 
> Rmerge (%)                                          14.9 (100)              
>                 12.7 (100)
> 
> Rmeas (%)                                            16.2 (100)             
>                  13.9 (100)
> 
> Rsym (%)                                               6.2 (68.6)           
>                     5.5 (57.1) Wilson B-factor                             
>        65.6                                        62.7
> 
> I’ve been told that the Rfree factor in the last shell are too high. Does
> anyone know how I can improve these Rfree factors other then cutting the
> resolution, which already is rather low?
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-- 
--
Tim Gruene
Head of the Centre for X-ray Structure Analysis
Faculty of Chemistry
University of Vienna

Phone: +43-1-4277-70202

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