title: [Isolation of ribosomal subparticles from human placenta containing intact rRNA and determination of the functional activity of the 80S ribosome].
abstract: The method for isolation of human placenta ribosomal subunits containing intact rRNA has been determined. The method uses fresh unfrozen placenta. Activity of 80S ribosomes obtained via reassociation of 40S and 60S subunits in non-enzymatic poly(U)-mediated Phe-tRNAPhe binding, was near 75% (maximal [14C]Phe-tRNA(Phe) binding was 1.5 mol Phe-tRNA(Phe) per mol of 80S ribosomes). Activity of 80S ribosomes with damaged rRNA isolated from frozen placenta was 2 times lower (the maximum level of poly(U)-dependent Phe-tRNA(Phe) binding was 0.7 mol per mol of ribosomes). The activity 80S ribosomes in poly(U)-mediated synthesis of polyphenylalanine was determined by using fractionated ("ribosomeless") protein synthesising system from rabbit reticulocytes. In this system up to the 50 mol of Phe residues per mol of 80S ribosomes are incorporated in acid insoluble fraction in 1 hour, at 37 degrees C. The obtained level of [14C]phenylalanine incorporation is three times as much as the amount of Phe residues observed for the ribosomal subunits, isolated from frozen placenta.
authors.forename: M A
authors.initials: MA
authors.lastname: Zenkova
authors.forename: N B
authors.initials: NB
authors.lastname: Matasova
authors.forename: S V
authors.initials: SV
authors.lastname: Myl'tseva
authors.forename: G G
authors.initials: GG
authors.lastname: Karpova
mesh_terms: D002474:Cell-Free System; D004587:Electrophoresis, Agar Gel; D005260:Female; D006801:Humans; D007700:Kinetics; D010649:Phenylalanine / Q000096:biosynthesis; D010920:Placenta / Q000378:metabolism*; D011072:Poly U / Q000378:metabolism; D011247:Pregnancy; D014176:Protein Biosynthesis; D012335:RNA, Ribosomal / Q000378:metabolism*; D012360:RNA, Transfer, Phe / Q000378:metabolism; D012270:Ribosomes / Q000378:metabolism*
chemical_list: D012335:RNA, Ribosomal; D012360:RNA, Transfer, Phe; D011072:Poly U; D010649:Phenylalanine
vernacular_title: Vydelenie ribosomykh subchastits iz platsenty cheloveka, soderzhashchikh intaktnuiu rRNK, i opredelenie funktsional'noĭ aktivnosti 80S ribosom.