Re: [ccp4bb]: Rotational Disorder in Protein Crystals

[Ed Lattman]

A reply to your last point is that an atomic structure was produced by Ken Holmes and collaborators from fibers of tobacco mosaic virus.  The rod-like particles are rotationally disordered about a single axis.  Low resolution 3-d reconstructions of spherical virus particles have been made using solution scattering data.  Here the particles were fully rationally averaged. You'd need a good model for the disorder in the crystal,  With that and heavy atom or A.S. derivatives you can probably get phases.  An interpretable model lis another story. Ed Eaton E. Lattman Mail to: Dean of Research and Graduate Education Johns Hopkins University Professor of Biophysics 3400 North Charles Street Krieger School of Arts and Sciences Mergenthaler 237 Johns Hopkins University Baltimore, MD 21218 410 516-8215 voice 410 516-4100 fax On May 17, 2006, at 12:41 PM, Steven Muchmore wrote: ***  For details on how to be removed from this list visit the  *** ***          CCP4 home page http://www.ccp4.ac.uk         *** I was wondering about the possibility (futility?) of working with a (potentially) rotationally disordered data set. Is it possible to use a disordered data set for molecular replacement?  What would one look for in the rotation and translation functions? Is it possible to refine against rotationally disordered data in protein data? Is it possible, in principle, to generate interpretable e-density maps from rotationally disordered data for protein structures? Steve __________________________________________________ Do You Yahoo!? Tired of spam?  Yahoo! Mail has the best spam protection around  http://mail.yahoo.com