title: Binuclear terbium(III) complex as a probe for tyrosine phosphorylation.
abstract: By using the luminescence from binuclear complexes of Tb(III) (Tb(2)-L(1) and Tb(2)-L(2)), phosphorylated Tyr residue in peptides was selectively detected in neutral aqueous solutions. Neither the non-phosphorylated Tyr, pSer, pThr, nor the other phosphate-containing biomolecules tested affected the luminescence intensity to any notable extent. Upon the binding of the pTyr to these Tb(III) complexes, the luminescence from the metal ion was notably promoted, as the light energy absorbed by the benzene ring of pTyr is efficiently transferred to the Tb(III) center. The binding activity of the binuclear Tb(III) complexes towards pTyr is two orders of magnitude larger than that of the corresponding mononuclear complex. These binuclear complexes were successfully used for real-time monitoring of enzymatic phosphorylation of a peptide by a tyrosine kinase.
authors.affiliation: Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-Ku, Tokyo, 153-8904 Japan.
authors.forename: Hiroki
authors.initials: H
authors.lastname: Akiba
authors.forename: Jun
authors.initials: J
authors.lastname: Sumaoka
authors.forename: Makoto
authors.initials: M
authors.lastname: Komiyama
mesh_terms: D000595:Amino Acid Sequence; D006801:Humans; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D049449:Luminescence; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry; D010455:Peptides / Q000737:chemistry*; D010766:Phosphorylation; D010770:Phosphotransferases / Q000378:metabolism*; D013725:Terbium / Q000737:chemistry* / Q000378:metabolism; D014443:Tyrosine / Q000032:analysis / Q000737:chemistry* / Q000378:metabolism; D014867:Water / Q000737:chemistry
chemical_list: D028581:Lanthanoid Series Elements; D009942:Organometallic Compounds; D010455:Peptides; D014867:Water; D013725:Terbium; D014443:Tyrosine; D010770:Phosphotransferases