Dear all,
I repeat my mail sent previously to ccp4bb on the same request:
Dear Murpholino,
there is a couple of articles addressing specifically this issue :
Urzhumtsev, A., Afonine, P.V., Lunin, V.Y., Terwilliger, T.C., Adams, P.D. (2014) "Metrics
for comparison of crystallographic maps".
Acta Cryst.,
D70,
2593-2606
Urzhumtseva, L., Urzhumtsev, A. (2016) "COMPaRS: stand-alone program for map comparison using quantile rang scaling".
J. Appl.Cryst.,
49,
2270-2275.
Best regards,
Sacha Urzhumtsev
Hi Murpholino,
You can use phenix.map_comparison map1.ccp4 map2.ccp4 contour_to_match=1.035
This will identify the contour in map2.ccp4 that encloses a volume equal to that enclosed by the contour at 1.035 (absolute, not sigma value) in map1.ccp4.
The method is described in
Afonine, P.V., Klaholz, B.P., Moriarty, N.W., Poon, B.K., Sobolev, O.V., Terwilliger, T.C., Adams, P.D, Urzhumtsev, A. (2018). New
tools for the analysis and validation of Cryo-EM maps and atomic models. Acta Cryst. D74, 814-840. bioRxiv 279844; http://scripts.iucr.org/cgi-bin/paper?S2059798318009324
All the best,
Tom T
I want to compare electron density features of map A from protein A and map B from protein B...
Because each map has a different rmsd level...
...what is the best way to compare electron density between maps?
Is there a way to normalize maps or something like that?
Thanks
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Thomas C Terwilliger
Laboratory Fellow, Los Alamos National Laboratory
Senior Scientist, New Mexico Consortium
100 Entrada Dr, Los Alamos, NM 87544
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