title: Limiting factors of the translation machinery.
abstract: Cell-free production of proteins is a rapid developing technology for many applications in proteomic sciences. Although great progress was made in the last years, in vitro protein synthesis is still less efficient than in vivo protein synthesis. For Escherichia coli based systems, all factors needed for cell-free protein synthesis are established, as shown in the reconstituted PURE system. Here we report the influence of additional translation factors, aminoacyl-tRNA synthetases and translational active ribosomes on cell-free protein synthesis of E. coli S30 extracts, indicating that none of these factors is a limiting factor for the protein synthesis. Furthermore, we show that varying the ratio of ribosomes including associated factors to other factors present in the extracts could not increase the yield of protein synthesized. In summary our results provide strong evidence for an optimal reconstitution of the translation machinery in E. coli S30 extracts.
authors.affiliation: Department of Biophysics and Physical Biochemistry, University of Regensburg, Postfach, D-93040 Regensburg, Federal Republic of Germany.
authors.forename: Axel
authors.initials: A
authors.lastname: Freischmidt
authors.forename: Maren
authors.initials: M
authors.lastname: Meysing
authors.forename: Michael
authors.initials: M
authors.lastname: Liss
authors.forename: Ralf
authors.initials: R
authors.lastname: Wagner
authors.forename: Hans Robert
authors.initials: HR
authors.lastname: Kalbitzer
authors.forename: Gudrun
authors.initials: G
authors.lastname: Horn
mesh_terms: D000604:Amino Acyl-tRNA Synthetases / Q000737:chemistry* / Q000378:metabolism; D002457:Cell Extracts; D002474:Cell-Free System / Q000737:chemistry / Q000378:metabolism*; D004926:Escherichia coli / Q000737:chemistry / Q000378:metabolism; D014176:Protein Biosynthesis; D012269:Ribosomal Proteins / Q000737:chemistry* / Q000378:metabolism; D012270:Ribosomes / Q000737:chemistry* / Q000378:metabolism
chemical_list: D002457:Cell Extracts; D012269:Ribosomal Proteins; D000604:Amino Acyl-tRNA Synthetases