title: Interaction of elongation factor Tu with 2'(3')-O-aminoacyloligonucleotides derived from the 3' terminus of aminoacyl-tRNA.
abstract: The interaction between Escherichia coli elongation factor-Tu-GTP complex and chemically synthesized 2'(3')-O-aminoacyldinucleoside phosphates with the nucleotide sequence of the 3' terminus of aminoacyl-tRNA (AA-tRNA) has been studied. It was found that C-A-Phe, C-A-Pro, and C-A-Asp interact with EF-Tu-GTP, causing the release of GTP bound to the enzyme. The specificity of this interaction closely resembles that of AA-tRNA since C-A and C-A(Ac-Phe) as well as the corresponding tRNAs are inactive. The 3'-O-aminoacyl derivative C-2'-dA-Phe does not interact with EF-Tu-GTP, whereas the 2'-O-aminoacyl derivative C-3'-dA-Phe is almost as active as the 2'(3')-O-aminoacyl derivative, C-A-Phe. C-A-Phe also interacts with the EF-Tu-GDP complex in a manner similar to its interaction with EF-Tu-GTP. It is concluded that interaction of 2'(3')-O-aminoacyloligonucleotides possessing the sequence of the 3' terminus of AA-tRNA is analogous to the interaction of that terminus with EF-Tu and it is suggested that EF-Tu is specific for 2'-O-AA-tRNA.
mesh_terms: D001665:Binding Sites; D006150:Guanine Nucleotides; D006160:Guanosine Triphosphate; D007700:Kinetics; D046911:Macromolecular Substances; D008958:Models, Molecular; D009690:Nucleic Acid Conformation; D009841:Oligonucleotides; D010445:Peptide Elongation Factors; D010649:Phenylalanine; D011485:Protein Binding; D012343:RNA, Transfer
chemical_list: D006150:Guanine Nucleotides; D046911:Macromolecular Substances; D009841:Oligonucleotides; D010445:Peptide Elongation Factors; D010649:Phenylalanine; D006160:Guanosine Triphosphate; D012343:RNA, Transfer