Dear Gaoyina,

I have not met this situation before myself, but I have some remarks:

-          Are you sure that none of your crystal contacts is a dimer interface?

-          Did you do SEC or SAXS at conditions close to the crystallization 
conditions? Crystallization conditions themselves off course lead to protein 
precipition. However, you might have stumbled upon crystallization conditions 
that break the dimer.
Best,
Herman

Von: CCP4 bulletin board [mailto:[email protected]] Im Auftrag von dpsk
Gesendet: Mittwoch, 27. Mai 2015 04:56
An: [email protected]
Betreff: [ccp4bb] About protein aggregation~!

Hi,
Recentely,we determined a monomer protein structure which looks like an dimer 
in solution via size-exclusion chromatography and SAXS,
have you guys met such a situation before? or some references,

Thank you for your reading

Best wishes,

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