title: Peroxynitrite disables the tyrosine phosphorylation regulatory mechanism: Lymphocyte-specific tyrosine kinase fails to phosphorylate nitrated cdc2(6-20)NH2 peptide.
abstract: To determine if nitration of tyrosine residues by peroxynitrite (PN), which can be generated endogenously, can disrupt the phosphorylation of tyrosine residues in proteins involved in cell signaling networks, we studied the effect of PN-promoted nitration of tyrosine residues in a pentadecameric peptide, cdc2(6-20)NH2, on the ability of the peptide to be phosphorylated. cdc2(6-20)NH2 corresponds to the tyrosine phosphorylation site of p34cdc2 kinase, which is phosphorylated by lck kinase (lymphocyte-specific tyrosine kinase, p56lck). PN nitrates both Tyr-15 and Tyr-19 of the peptide in phosphate buffer (pH 7.5) at 37 degrees C. Nitration of Tyr-15. which is the phosphorylated amino acid residue, inhibits completely the phosphorylation of the peptide. The nitration reaction is enhanced by either Fe(III)EDTA or Cu(II)-Zn(II)-superoxide dismutase (Cu,Zn-SOD). The kinetic data are consistent with the view that reactions of Fe(111)EDTA or Cu,Zn-SOD with the cis form of PN yield complexes in which PN decomposes more slowly to form N02+, the nitrating agent. Thus, the nitration efficiency of PN is enhanced. These results are discussed from the point of view that PN-promoted nitration will result in permanent impairment of cyclic cascades that control signal transduction processes and regulate cell cycles.
authors.affiliation: Laboratory of Biochemistry, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD 20892, USA.
authors.forename: S K
authors.initials: SK
authors.lastname: Kong
authors.forename: M B
authors.initials: MB
authors.lastname: Yim
authors.forename: E R
authors.initials: ER
authors.lastname: Stadtman
authors.forename: P B
authors.initials: PB
authors.lastname: Chock
mesh_terms: D000595:Amino Acid Sequence; D016203:CDC2 Protein Kinase / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D002453:Cell Cycle; D004492:Edetic Acid / Q000494:pharmacology; D005290:Ferric Compounds / Q000494:pharmacology; D066298:In Vitro Techniques; D007502:Iron Chelating Agents / Q000494:pharmacology; D007700:Kinetics; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck); D008969:Molecular Sequence Data; D009566:Nitrates / Q000378:metabolism / Q000494:pharmacology*; D010446:Peptide Fragments / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D010766:Phosphorylation; D015398:Signal Transduction; D014443:Tyrosine / Q000378:metabolism*; D019061:src-Family Kinases / Q000378:metabolism*
chemical_list: D005290:Ferric Compounds; D007502:Iron Chelating Agents; D009566:Nitrates; D010446:Peptide Fragments; C039642:peroxynitric acid; D014443:Tyrosine; D004492:Edetic Acid; D019860:Lymphocyte Specific Protein Tyrosine Kinase p56(lck); D019061:src-Family Kinases; D016203:CDC2 Protein Kinase; C019179:Fe(III)-EDTA