Hi James,
what about the use of highly anisotropic data, what it means in terms of
macromolecule arrangement within the crystal, and how to use the data
appropriately? An obvious link to item 5) and what resolution is in such
case?
An opening to item 6) and contribution of solvent as anisotropy is
especially enhanced in membrane protein crystals... what would be the
implication of the solvent and how to account for it?
All the best
Vincent
Le 15/07/2019 à 21:44, Holton, James M a écrit :
Hello folks,
I have the distinct honor of chairing the next Gordon Research
Conference on Diffraction Methods in Structural Biology (July 26-31
2020). This meeting will focus on the biggest challenges currently
faced by structural biologists, and I mean actual real-world
challenges. As much as possible, these challenges will take the form of
friendly competitions with defined parameters, data, a scoring system,
and "winners", to be established along with other unpublished results
only at the meeting, as is tradition at GRCs.
But what are the principle challenges in biological structure
determination today? I of course have my own ideas, but I feel like I'm
forgetting something. Obvious choices are:
1) getting crystals to diffract better
2) building models into low-resolution maps (after failing at #1)
3) telling if a ligand is really there or not
4) the phase problem (dealing with weak signal, twinning and
pseudotranslation)
5) what does "resolution" really mean?
6) why are macromolecular R factors so much higher than small-molecule ones?
7) what is the best way to process serial crystallography data?
8) how should one deal with non-isomorphism in multi-crystal methods?
9) what is the "structure" of something that won't sit still?
What am I missing? Is industry facing different problems than
academics? Are there specific challenges facing electron-based
techniques? If so, could the combined strength of all the world's
methods developers solve them? I'm interested in hearing the voice of
this community. On or off-list is fine.
-James Holton
MAD Scientist
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--
Vincent Chaptal, PhD
MMSB -UMR5086
Drug Resistance and Membrane Proteins Laboratory
7 passage du Vercors
69007 LYON
FRANCE
+33 4 37 65 29 01
http://mmsb.cnrs.fr/en/
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