Hi everyone,

I would like to do a quick rigid-body refinement of a model against a low 
resolution (6 Å) cryo-EM map. The model consists of four tetramers and I want 
to refine each tetramer as a rigid body, either with one (anisotropic?) ADP per 
tetramer or at the most one per chain. I haven't yet found a good way to do 
this. With phenix.refine the default is one ADP per residue and I can't see how 
to change that behaviour (at least through the Phenix GUI). I tried Servalcat 
but I can't see a way to restrict it to rigid body only. Given more time, I 
hope to reach a fuller understanding of each program, but I need to solve the 
immediate problem in the next couple of days (what with Christmas coming up...) 
Any suggestions?

I have also understood that the best practice is to refine against the 
unsharpened map, correct?

Thanks
Derek
_____________________________________________________
Derek Logan
Professor | Biochemistry and Structural Biology
Centre for Molecular Protein Science
Lund University, Box 124, 221 00 Lund, Sweden
www.cmps.lu.se













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