title: Peptide bond formation stimulated by protein synthesis factor EF-P depends on the aminoacyl moiety of the acceptor.
abstract: Elongation factor EF-P is a soluble protein that stimulates peptide bond synthesis catalyzed by the 50-S ribosomal subunit. This factor was previously identified and characterized based on its ability to promote the synthesis of formylmethionine-puromycin. In the present work, we tested the ability of EF-P to promote peptide bond synthesis between ribosome-bound fMet-tRNA and several analogues of the 3' terminus of aminoacyl-tRNA, i.e. the cytidylyl(3'-5')-[2'(3')-O-L-aminoacyladenosines]. EF-P promoted synthesis to the greatest extent with certain acceptors which were otherwise inefficient in the peptidyl transferase reaction. This activity of EF-P could not be replaced by the other soluble proteins known to be involved in polypeptide synthesis, such as EF-Tu, EF-Ts and EF-G. One role of EF-P in protein synthesis may be to allow peptide bond synthesis to occur more efficiently with some aminoacyl-tRNAs that are poor acceptors for the ribosomal peptidyl transferase.
mesh_terms: D004926:Escherichia coli / Q000378:metabolism*; D007700:Kinetics; D009239:N-Formylmethionine; D010441:Peptide Chain Elongation, Translational; D010445:Peptide Elongation Factors / Q000378:metabolism*; D010458:Peptidyl Transferases / Q000378:metabolism; D012346:RNA, Transfer, Amino Acyl / Q000378:metabolism*; D012270:Ribosomes / Q000378:metabolism*
chemical_list: D010445:Peptide Elongation Factors; D012346:RNA, Transfer, Amino Acyl; D009239:N-Formylmethionine; D010458:Peptidyl Transferases