Quality Control: Difference between revisions

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This is an attempt of putting together a number of datasets with different characteristics (high and low resolution, good and bad crystals, untwinned and twinned), their evaluation with different versions of [[XDS]] up to the structure solution (as far as that can be done automatically), and the determination of the quality of the resulting data using experimental phasing and refinement.
This is an attempt of putting together a number of datasets with different characteristics (high and low resolution, good and bad crystals, untwinned and twinned), their evaluation with different versions of [[XDS]] up to the structure solution (as far as that can be done automatically), and the determination of the quality of the resulting data using experimental phasing and refinement.


The '''goal''' of this is to find generally optimal parameters for XDS data reduction, to compare new versions of [[XDS]] with older ones, and to discover bugs or regressions. At the same time, it serves to display standard procedures for solving crystal structures, which may be used for teaching or learning crystallography.
== Assorted projects ==
 
The '''metrics''' I would like to look at is
* anomalous signal: SHELXC anomalous correlations (internally or between wavelengths); SHELXD (fixed version) success rates and CCall/CCweak maximum values. Clemens Vonrhein additionally suggested anomalous difference fourier peak heights.
* refinement of a given (known) set of heavy atom positions in (e.g.) SHARP (fixed version): r.m.s. or absolute phase difference, or map correlation w.r.t. phases from good model
* refinement with (e.g.) refmac5 (fixed version) of a given model, finding LL and R/R<sub>free</sub>


For each project mentioned below, both '''the raw data ''and'' the [[XDS]] data reduction is available''' - links are on the project pages, which are named according to their [http://www.rcsb.org PDB] ids.  
For each project mentioned below, both '''the raw data ''and'' the [[XDS]] data reduction is available''' - links are on the project pages, which are named according to their [http://www.rcsb.org PDB] ids.  
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* 2-wl Bromide MAD: PDB id [[1RQW]] ([http://www.rcsb.org/pdb/explore.do?structureId=1RQW Thaumatin], a sweet-tasting protein of 207 resides, spacegroup P4<sub>1</sub>2<sub>1</sub>2, resolution 1.8 Å, collected at the DGK Workshop 2007; could also treat either peak or inflection as SAD. These datasets have been made available by Manfred S. Weiss and Annette Faust (see [http://www.embl-hamburg.de/Xray_Tutorial/ Xray Tutorial]).
* 2-wl Bromide MAD: PDB id [[1RQW]] ([http://www.rcsb.org/pdb/explore.do?structureId=1RQW Thaumatin], a sweet-tasting protein of 207 resides, spacegroup P4<sub>1</sub>2<sub>1</sub>2, resolution 1.8 Å, collected at the DGK Workshop 2007; could also treat either peak or inflection as SAD. These datasets have been made available by Manfred S. Weiss and Annette Faust (see [http://www.embl-hamburg.de/Xray_Tutorial/ Xray Tutorial]).


== ACA2011 ==


As part of the [http://bl831.als.lbl.gov/example_data_sets/ACA2011/DPWTP-website/index.html 2011 ACA workshop on data processing], organized by Ed Collins and Andy Torelli, I extensively document XDS data processing (and in most cases also structure solution) of
As part of the [http://bl831.als.lbl.gov/example_data_sets/ACA2011/DPWTP-website/index.html 2011 ACA workshop on data processing], organized by Ed Collins and Andy Torelli, I extensively document XDS data processing (and in most cases also structure solution) of
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* [[1Y13]]: SAD with a twist that requires some detective work.
* [[1Y13]]: SAD with a twist that requires some detective work.


Recently I've written [[SIM_MX]] which should make parts of testing and development of XDS independant from real data.
== [[ACA2014]] ==
 
Data from several projects were processed by experts at the "Data processing with the pros" session of the [[ACA2014]] in Albuquerque, New Mexico (USA) at the end of May 2014.
 
== Simulated data ==
 
I wrote [[SIM_MX]] which makes testing and development of XDS independant from real data.
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