title: Synthesis of a fluorescent 7-methylguanosine analog and a fluorescence spectroscopic study of its reaction with wheatgerm cap binding proteins.
abstract: In the initiation of protein synthesis, the mRNA 5'-terminal 7-methylguanosine cap structure and several recognition proteins play a pivotal role. For the study of this cap binding reaction, one approach is to use fluorescence spectroscopy. A ribose diol-modified fluorescent cap analog, anthraniloyl-m7GTP (Ant-m7GTP), was designed and synthesized for this purpose. This fluorescent cap analog was found to have a high quantum yield, resistance to photobleaching and avoided overlap of excitation and emission wavelengths with those of proteins. The binding of Ant-m7GTP with wheatgerm initiation factors elF-4F and elF-(iso)4F was determined. The fluorescent cap analog and m7GTP had similar interactions with both cap binding proteins. Fluorescence quenching experiments showed that the microenvironment of Ant-m7GTP when bound to protein was hydrophobic.
authors.affiliation: Department of Chemistry, Hunter College of the City University of New York, NY 10021-5024, USA.
authors.forename: J
authors.initials: J
authors.lastname: Ren
authors.forename: D J
authors.initials: DJ
authors.lastname: Goss
mesh_terms: D006160:Guanosine Triphosphate / Q000138:chemical synthesis* / Q000378:metabolism; D039381:RNA Cap-Binding Proteins; D012315:RNA Caps; D016601:RNA-Binding Proteins / Q000378:metabolism*; D013050:Spectrometry, Fluorescence; D014908:Triticum; D062367:ortho-Aminobenzoates / Q000138:chemical synthesis* / Q000378:metabolism
chemical_list: D039381:RNA Cap-Binding Proteins; D012315:RNA Caps; D016601:RNA-Binding Proteins; D062367:ortho-Aminobenzoates; C063981:2'(3')-O-(N-methyl)anthraniloylguanosine 5'-triphosphate; D006160:Guanosine Triphosphate