title: A fast and simple method to prepare the FKBP-rapamycin binding domain of human target of rapamycin for NMR binding assays.
abstract: Mammalian target of rapamycin (TOR) controls cell growth and metabolism in response to the availability of nutrients, growth factors, and the cellular energy status. Misregulation of TOR can result in a pathogenic increase or decrease in organ size and in cancer. TOR can be inhibited by binding of a complex of rapamycin and FKBP to the FKBP-rapamycin binding (FRB) domain. Rapamycin and derivatives of it have been used as immunosuppressive drugs. Because TOR is further an interesting drug target in cancer research, we established an expression, purification, and refolding protocol for the FRB domain of human TOR (hFRB). hFRB is extracted from inclusion bodies, purified by reversed phase HPLC, and refolded by drop-wise dilution of the denatured protein into a native buffer. The procedure is very simple and can easily be scaled up to prepare large amounts of functional protein for high-throughput cancer drug screening assays by NMR and other techniques.
authors.affiliation: Biozentrum Basel, Department of Structural Biology, University of Basel, Klingelbergstr. 70, 4056 Basel, Switzerland. sonja.dames@unibas.ch
authors.forename: Sonja A
authors.initials: SA
authors.lastname: Dames
mesh_terms: D002352:Carrier Proteins / Q000302:isolation & purification*; D004591:Electrophoresis, Polyacrylamide Gel; D006801:Humans; D000076222:Mechanistic Target of Rapamycin Complex 1; D046912:Multiprotein Complexes; D019906:Nuclear Magnetic Resonance, Biomolecular; D017853:Phosphotransferases (Alcohol Group Acceptor) / Q000302:isolation & purification*; D017510:Protein Folding; D011494:Protein Kinases / Q000302:isolation & purification*; D017434:Protein Structure, Tertiary; D011506:Proteins; D058570:TOR Serine-Threonine Kinases; D014157:Transcription Factors / Q000302:isolation & purification*
chemical_list: D002352:Carrier Proteins; D046912:Multiprotein Complexes; D011506:Proteins; D014157:Transcription Factors; D011494:Protein Kinases; D017853:Phosphotransferases (Alcohol Group Acceptor); C546842:MTOR protein, human; D000076222:Mechanistic Target of Rapamycin Complex 1; D058570:TOR Serine-Threonine Kinases