Intrinsic protein fluorescence assays for GEF, GAP and post-translational modifications of small GTPases.
Evidence and arguments are summarized that suggest that intrinsic (tryptophan) protein fluorescence provides an excellent and convenient signal for monitoring both GEF (guanine nucleotide exchange factor) and GAP (GTPase activating protein) activity of a large number of small GTPases. In addition, post-translational modifications of Rab proteins occurring in a region known to be a hot spot for such modifications also lead to fluorescence changes that can be accurately monitored in a time-dependent manner. It is suggested that intrinsic fluorescence should be the first method chosen for monitoring such reactions of tryptophan-containing small GTPases.
Max-Planck-Institute of Molecular Physiology, Otto-Hahn-Str. 11, 44227, Dortmund, Germany. Electronic address: philip.goody@ukb.uni-bonn.de.
Philip R
PR
Goody
D002460:Cell Line; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D020690:GTPase-Activating Proteins / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D061848:Optical Imaging / Q000379:methods*; D011499:Protein Processing, Post-Translational; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*
D004268:DNA-Binding Proteins; D020690:GTPase-Activating Proteins; C480633:SLC2A4RG protein, human; D014157:Transcription Factors
AnkX; Enzyme kinetics; GAPs; GEFs; GTPases; Intrinsic protein fluorescence