title: Synthesis and application of bidentate photoaffinity cross-linking reagents. Nucleotide photoaffinity probes with two photoactive groups.
abstract: Two "targeted bidentate" photoaffinity cross-linking reagents, the monoanhydride of 8-N3ADP with N-(4-(benzoyl)phenylmethyl)phosphoramide ([gamma-32P]8-N3ATP gamma BP) and the monoanhydride of 8-N3GDP with N-(4-(benzoyl)phenylmethyl)-phosphoramide ([gamma-32P]8-N3GTP gamma BP), were developed for studying the inter- and intramolecular interactions of nucleotide-binding proteins. Experiments using these bidentate reagents with two photoactive groups led to specific cross-linking: [gamma-32P]8-N3GTP gamma BP and [gamma-32P]8-N3ATP gamma BP showed intersubunit cross-linking of glutamate dehydrogenase and [gamma-32P]8-N3GTP gamma BP appeared to cross-link the alpha- and beta-subunits of tubulin. The non-azido "monodentate" versions of these reagents, the monoanhydride of ADP with N-(4-(benzoyl)phenylmethyl)-phosphoramide ([gamma-32P]ATP gamma BP) and the monoanhydride of GDP with N-(4-(benzoyl)phenylmethyl)-phosphoramide ([gamma-32P]GTP gamma BP), were also synthesized and characterized. The ability of these monodentate reagents with one photoactive group to serve as photoaffinity probes was established by photolabeling specifically the exchangeable GTP-binding domain of tubulin with [gamma-32P]GTP gamma BP and the ATP-binding domain of purified adenylate kinase and several nucleotide-binding proteins in human brain homogenate with [gamma-32P]ATP gamma BP.
authors.affiliation: Department of Chemistry, College of Pharmacy, Lucille P. Markey Cancer Center, University of Kentucky, Lexington 40506.
authors.forename: K
authors.initials: K
authors.lastname: Rajagopalan
authors.forename: A J
authors.initials: AJ
authors.lastname: Chavan
authors.forename: B E
authors.initials: BE
authors.lastname: Haley
authors.forename: D S
authors.initials: DS
authors.lastname: Watt
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000262:Adenylyl Cyclases / Q000378:metabolism; D000345:Affinity Labels / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism; D001345:Autoradiography; D001921:Brain / Q000378:metabolism; D005969:Glutamate Dehydrogenase / Q000378:metabolism; D006801:Humans; D046911:Macromolecular Substances; D009682:Magnetic Resonance Spectroscopy; D009419:Nerve Tissue Proteins / Q000378:metabolism*; D010761:Phosphorus Radioisotopes; D010782:Photolysis; D012265:Ribonucleotides / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism; D014404:Tubulin / Q000378:metabolism*
chemical_list: D000345:Affinity Labels; D046911:Macromolecular Substances; D009419:Nerve Tissue Proteins; D010761:Phosphorus Radioisotopes; D012265:Ribonucleotides; D014404:Tubulin; D000255:Adenosine Triphosphate; D005969:Glutamate Dehydrogenase; D000262:Adenylyl Cyclases