Senior Principal Scientist
I participated in a structure-based drug design team by leading a group focusing on the overproduction and purification of recombinant proteins for X-ray and NMR studies. I also developed new technologies for protein expression & affinity purification, including the first vector for expression of biotin-tagged proteins in E. coli (Tsao et al.,Gene, 1996, 59-64). I also pioneered the development of E. coli BL21(DE3) mutants with genetic lesions created by phage transducion that were designed to prevent cross-labeling of other amino acids, for NMR experiments where it was desirable to label only one or a few amino acids with !5-N (Waugh, D.S., J. Biomol. NMR, 1996, 184-192), I have prepared dozens of stable isotopically labeled proteins, including 15N, 13C and 2H, for NMR studies. Both of these endeavors have resulted in a multitude of requests for biological materials. I have deposited the Biotin acceptor peptide vector with Addgene, so I don't get too many personal requests for that anymore, although Addgene does. Unfortunately, I have yet to find a repository for the he genetically modified E. coli strains I created. They are still available only from me.