Dear all,
    We are working on protein-inhibitor complex crystal structures, although we 
did get nice crystals and soaked them with inhibitor for several days, all 
structures we obtained were empty!!There are nothing at the active site. For 
several crystals. their color turned very clearly from colorless to yellow the 
color of the inhibitors, nothing found either.
    These inhibitors work very well in enzyme assay. We, especially our 
students, are very depressed...
    Any suggestions will be really appreciated!


    

Xiaopeng Hu, D.Sc.,
School of Pharmaceutical Sciences
Sun Yat-sen University,
Higher Education Mega Center
Guangzhou, Guangdong, China 510006
Tel. +86 020 39943032 

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