title: Affinity labeling by a photoreactive GTP analogue of the delta-subunit of eukaryotic initiation factor eIF-2 in different initiation complexes.
abstract: The interaction of GTP with initiation factor eIF-2 in different complexes was studied by affinity labeling using a derivative of [3H]GTP carrying a photoreactive group in the alpha-phosphate moiety. In the binary complex [eIF-2.GTP analogue], in the ternary complex [eIF-2.GTP analogue.Met-tRNAf] as well as in the eIF-2. eIF-2B complex the alpha-subunit of eIF-2 was found to be specifically labeled. GTP is concluded to interact during polypeptide chain initiation with the alpha-subunit of eIF-2 at least by its alpha-phosphate group.
authors: Department of Cell Physiology, Academy of Sciences of the GDR, Berlin-Buch.
authors: U A
authors: UA
authors: Bommer
authors: M M
authors: MM
authors: Salimans
authors: T V
authors: TV
authors: Kurzchalia
authors: H O
authors: HO
authors: Voorma
authors: G G
authors: GG
authors: Karpova
mesh_terms: D000345:Affinity Labels / Q000378:metabolism*; D000818:Animals; D001386:Azides / Q000378:metabolism*; D015852:Eukaryotic Initiation Factor-2; D006160:Guanosine Triphosphate / Q000031:analogs & derivatives* / Q000378:metabolism; D008099:Liver / Q000378:metabolism*; D008970:Molecular Weight; D010442:Peptide Chain Initiation, Translational; D010448:Peptide Initiation Factors / Q000378:metabolism*; D011506:Proteins / Q000378:metabolism*; D012346:RNA, Transfer, Amino Acyl / Q000378:metabolism; D012358:RNA, Transfer, Met; D051381:Rats; D012156:Reticulocytes / Q000378:metabolism
chemical_list: D000345:Affinity Labels; D001386:Azides; D015852:Eukaryotic Initiation Factor-2; D010448:Peptide Initiation Factors; D011506:Proteins; D012346:RNA, Transfer, Amino Acyl; D012358:RNA, Transfer, Met; C024988:tRNA, formylmethionine-; C031907:GTP gamma-4-azidoanilide; D006160:Guanosine Triphosphate