I recently had a case, unpublished right now, where the NMR structure of the monomer was determined and all other biochemical evidence showed a monomer as the active form. The resulting crystal structure turned out to be a domain swapped dimer. The group I did the work for are still puzzling over it and have tried a number of things to see if the structure is biologically significant.

Leonard Thomas Ph. D.
Macromolecular Crystallography Laboratory Manager
University of Oklahoma
Department of Chemistry and Biochemistry
620 Parrington Oval
Norman, OK 73032

[email protected]
Office: 405-325-1126
Lab: 405-325-7571

On Dec 11, 2008, at 10:09 AM, Santarsiero, Bernard D. wrote:

In parallel with the discussion around this off-CCP4-topic, are they any
good examples of the opposite case, where the protein is a monomer in
solution (as evident from light scattering, MW determination through
centrifugation, EPR, etc.) but crystallizes as a dimer or higher multimer?

Bernie Santarsiero

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