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Heubeck C, Schön A. Cyanelle ribonuclease P: isolation and structure-function studies of an organellar ribonucleoprotein enzyme. Methods Enzymol 2002; 342:118-34. [PMID: 11586887 DOI: 10.1016/s0076-6879(01)42540-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Affiliation(s)
- C Heubeck
- Institut für Biochemie, Universität Würzburg, Biozentrum D-97074 Würzburg, Germany
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2
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Andrews AJ, Hall TA, Brown JW. Characterization of RNase P holoenzymes from Methanococcus jannaschii and Methanothermobacter thermoautotrophicus. Biol Chem 2001; 382:1171-7. [PMID: 11592398 DOI: 10.1515/bc.2001.147] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The partial purification and basic biochemical characterization of the RNase P holoenzymes of two species of methanogenic Archaea, Methanothermobacter thermoautotrophicus (previously Methanobacterium thermoautotrophicum strain deltaH) and Methanococcus jannaschii, are described. The properties of these enzymes, particularly buoyant density in Cs2SO4 and recent information about the subunit composition of the archaeal enzymes, suggest that RNase P enzymes in Archaea are much more alike than earlier studies in Sulfolobus acidocaldarius and Haloferax volcanii suggested.
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Affiliation(s)
- A J Andrews
- Department of Microbiology, North Carolina State University, Raleigh 27695-7615, USA
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3
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Patel VB, Cunningham CC, Hantgan RR. Physiochemical properties of rat liver mitochondrial ribosomes. J Biol Chem 2001; 276:6739-46. [PMID: 11106644 DOI: 10.1074/jbc.m005781200] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
In the present study, the physiochemical properties of rat liver mitochondrial ribosomes were examined and compared with Escherichia coli ribosomes. The sedimentation and translational diffusion coefficients as well as the molecular weight and buoyant density of rat mitochondrial ribosomes were determined. Sedimentation coefficients were established using the time-derivative algorithm (Philo, J. S. (2000) Anal. Biochem. 279, 151-163). The sedimentation coefficients of the intact monosome, large subunit, and small subunit were 55, 39, and 28 S, respectively. Mitochondrial ribosomes had a particle composition of 75% protein and 25% RNA. The partial specific volume was 0.688 ml/g, as determined from the protein and RNA composition. The buoyant density of formaldehyde-fixed ribosomes in cesium chloride was 1.41 g/cm(3). The molecular masses of mitochondrial and E. coli ribosomes determined by static light-scattering experiments were 3.57 +/- 0.14 MDa and 2.49 +/- 0.06 MDa, respectively. The diffusion coefficient obtained from dynamic light-scattering measurements was 1.10 +/- 0.01 x 10(-7) cm(2) s(-1) for mitochondrial ribosomes and 1.72 +/- 0.03 x 10(-7) cm(2) s(-1) for the 70 S E. coli monosome. The hydration factor determined from these hydrodynamic parameters were 4.6 g of water/g of ribosome and 1.3 g/g for mitochondrial and E. coli ribosomes, respectively. A calculated hydration factor of 3.3 g/g for mitochondrial ribosomes was also obtained utilizing a calculated molecular mass and the Svedberg equation. These measurements of solvation suggest that ribosomes are highly hydrated structures. They are also in agreement with current models depicting ribosomes as porous structures containing numerous gaps and tunnels.
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Affiliation(s)
- V B Patel
- Department of Biochemistry, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157-1016, USA
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4
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Cordier A, Schön A. Cyanelle RNase P: RNA structure analysis and holoenzyme properties of an organellar ribonucleoprotein enzyme. J Mol Biol 1999; 289:9-20. [PMID: 10339401 DOI: 10.1006/jmbi.1999.2762] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The cyanelle of the primitive alga Cyanophora paradoxa is the only photosynthetic organelle where the ribonucleoprotein nature of ribonuclease P has been functionally proven. To increase our knowledge about RNA structure and overall composition of this enzyme, we have now determined relevant physical parameters and performed RNA accessibility experiments. Buoyant density and relative molecular mass of cyanelle RNase P were more similar to the eukaryotic (nuclear or mitochondrial) than to the bacterial enzyme type, despite the close phylogenetic relationship between plastids and cyanobacteria. Enzymatic and chemical probing was used to establish the secondary structure of cyanelle RNase P RNA. The results obtained with the naked transcript support the previously proposed, phylogenetically derived structure. Probing of the RNA in the holoenzyme resulted in reduced sensitivity at a large number of positions, indicating that these regions might be located in the interior of the ribonucleoprotein. Protection of the RNA in cyanelle RNase P was more extensive than reported for the Escherichia coli holoenzyme, but similar to the pattern observed in yeast nuclear RNase P. Taken together, these results indicate that the protein contribution in cyanelle RNase P is much larger than in the bacterial enzymes, and that the overall composition of the holoenzyme resembles that found in eukaryotes.
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Affiliation(s)
- A Cordier
- Institut für Biochemie, Bayerische Julius-Maximilians-Universität, Biozentrum, Würzburg, 97074, Germany
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5
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Rossmanith W, Karwan RM. Characterization of human mitochondrial RNase P: novel aspects in tRNA processing. Biochem Biophys Res Commun 1998; 247:234-41. [PMID: 9642109 DOI: 10.1006/bbrc.1998.8766] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Human mitochondrial RNase P does not distinguish itself from other RNase P enzymes by most of its basic properties. 5' phosphates on tRNA products, strict dependence on a divalent cation, independence of ATP or other cofactors, and sensitivity to puromycin are generally characteristic for RNase P. Slow sedimentation of human mitochondrial RNase P in glycerol gradients suggests a molecular weight considerably lower than that of bacterial or nuclear RNase P. In contrast to fungi, all putative components of mammalian mitochondrial RNase P are encoded by the nucleus. Intriguingly, no indication of the involvement of a trans-acting RNA was found in mammalian mitochondrial tRNA processing. Mitochondrial RNase P is resistant to rigorous treatments with nucleases and exhibits a protein-like density in Cs2SO4 gradients. Moreover, an analysis of copurifying RNAs revealed no putative RNase P RNA candidates. These data suggest that mammalian mitochondrial RNase P, unlike its nuclear counterpart or its bacterial relatives, is not a ribonucleoprotein but a protein enzyme.
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Affiliation(s)
- W Rossmanith
- Institut für Tumorbiologie-Krebsforschung der Universität Wien, Borschkegasse 8a, Vienna, A-1090, Austria.
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6
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Arends S, Schon A. Partial purification and characterization of nuclear ribonuclease P from wheat. EUROPEAN JOURNAL OF BIOCHEMISTRY 1997; 244:635-45. [PMID: 9119034 DOI: 10.1111/j.1432-1033.1997.t01-1-00635.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Ribonuclease P (RNase P) from wheat nuclei has been purified over 1000-fold, using wheat germ extract as starting material and a combination of poly(ethylenglycol) precipitation and column chromatography. The enzyme was shown to be of nuclear origin by its characteristic ionic requirements; for optimum activity it requires 0.5-1.5 mM Mg2+, which can be partly replaced by Mn2+. With about 100 kDa, wheat nuclear RNase P has the lowest molecular mass reported so far for a eukaryotic RNase P. The enzyme has an isoelectric point of 5.0 and a buoyant density of 1.34 g/ml in CsCl, suggesting the presence of a nucleic acid component; it is, however, insensitive against treatment with micrococcal nuclease. Wheat germ RNase P requires an intact tertiary structure of the pre-tRNA substrate; its cleavage efficiency is also influenced by the presence of an intron, and by the nature of the 3' terminus of the substrate. The apparent Km and Vmax for an intronless plant pre-tRNA(Tyr) are 10.3 nM and 1.12 fmol/min, respectively.
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MESH Headings
- Base Sequence
- Cell Nucleus/enzymology
- Endoribonucleases/genetics
- Endoribonucleases/isolation & purification
- Endoribonucleases/metabolism
- Isoelectric Point
- Kinetics
- Micrococcal Nuclease
- Molecular Sequence Data
- Molecular Structure
- Molecular Weight
- Nucleic Acid Conformation
- Oligodeoxyribonucleotides/genetics
- RNA Precursors/chemistry
- RNA Precursors/genetics
- RNA Precursors/metabolism
- RNA Processing, Post-Transcriptional
- RNA, Catalytic/genetics
- RNA, Catalytic/isolation & purification
- RNA, Catalytic/metabolism
- RNA, Plant/chemistry
- RNA, Plant/genetics
- RNA, Plant/metabolism
- RNA, Transfer, Tyr/chemistry
- RNA, Transfer, Tyr/genetics
- RNA, Transfer, Tyr/metabolism
- Ribonuclease P
- Substrate Specificity
- Triticum/enzymology
- Triticum/genetics
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Affiliation(s)
- S Arends
- Institut für Biochemie, Bayerische Julius-Maximilians-Universität, Biozentrum, Würzburg, Germany
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7
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Abstract
Ribonuclease P (RNase P) is responsible for the generation of mature 5' termini of tRNA. The RNA component of this complex encodes the enzymatic activity in bacteria and is itself catalytically active under appropriate conditions in vitro. The role of the subunits in eucaryotes has not yet been established. We have partially purified RNase P activity from the ciliate protozoan Tetrahymena thermophila to learn more about the biochemical characteristics of RNase P from a lower eucaryote. The Tetrahymena RNase P displays a pH optimum and temperature optimum characteristic of RNase P enzymes isolated from other organisms. The Km of the T. thermophila enzyme for pre-tRNAGln is 1.6 x 10(-7)M, which is comparable to the values reported for other examples of RNase P. The Tetrahymena RNase P is a ribonucleoprotein complex, as supported by its sensitivity to micrococcal nuclease and proteinase K. The buoyant density of the enzyme in Cs2SO4 is 1.42 g/ml, which suggests that the RNA component of the Tetrahymena enzyme comprises a significantly greater percentage of the holoenzyme than that determined for RNase P of other Eucarya or Archaea. The holoenzyme has a requirement for divalent cations displaying characteristics that are unique for RNase P but closely resemble preferences reported for the Tetrahymena group I intron RNA. Puromycin inhibits pre-tRNA processing by the Tetrahymena complex, and implications of the similarities between recognition of tRNA by ribosomal components and RNase P are discussed.
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MESH Headings
- Animals
- Base Sequence
- Cations, Divalent
- Chromatography, Affinity
- Chromatography, Ion Exchange
- DNA Primers
- Endoribonucleases/antagonists & inhibitors
- Endoribonucleases/isolation & purification
- Endoribonucleases/metabolism
- Molecular Sequence Data
- Nucleic Acid Conformation
- Puromycin/pharmacology
- RNA Precursors/chemistry
- RNA Precursors/metabolism
- RNA, Catalytic/antagonists & inhibitors
- RNA, Catalytic/isolation & purification
- RNA, Catalytic/metabolism
- RNA, Transfer, Gln/chemistry
- RNA, Transfer, Gln/metabolism
- Ribonuclease P
- Substrate Specificity
- Tetrahymena thermophila/enzymology
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Affiliation(s)
- H L True
- Department of Microbiology and College of Medicine, University of Illinois, Urbana, Illinois 61801, USA
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8
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Abstract
Ribonuclease P (RNase P) is a key enzyme involved in tRNA biosynthesis. It catalyses the endonucleolytic cleavage of nearly all tRNA precursors to produce 5'-end matured tRNA. RNase P activity has been found in all organisms examined, from bacteria to mammals. Eubacterial RNase RNA is the only known RNA enzyme which functions in trans in nature. Similar behaviour has not been demonstrated in RNase P enzymes examined from archaebacteria or eukaryotes. Characterisation of RNase P enzymes from more diverse eukaryotic species, including the slime mold Dictyostelium discoideum, is useful for comparative analysis of the structure and function of eukaryotic RNase P.
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Affiliation(s)
- D Drainas
- Department of Biochemistry, School of Medicine, University of Patras, Greece
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9
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Stathopoulos C, Kalpaxis DL, Drainas D. Partial purification and characterization of RNase P from Dictyostelium discoideum. EUROPEAN JOURNAL OF BIOCHEMISTRY 1995; 228:976-80. [PMID: 7737203 DOI: 10.1111/j.1432-1033.1995.tb20349.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Ribonuclease P (RNase P) from Dictyostelium discoideum has been purified 470-fold. D. discoideum RNase P cleaves the precursor to Schizosaccharomyces pombe suppressor tRNA(Ser) at the same site as S. pombe RNase P, producing the mature 5' end of tRNA(Ser). pH and temperature optima for enzyme activity are 7.6 and 37 degrees C, respectively. The enzyme shows optimal activity in the presence of 5 mM MgCl2 and 10 mM NH4Cl or 5 mM KCl. The apparent Km for the S. pombe tRNA precursor derived from the supS1 tRNA(Ser) gene is 240 nM, and the apparent Vmax is 3.6 pmol/min. Inhibition of D. discoideum RNase P by proteinase K and micrococcal nuclease strongly indicates that the activity requires both protein and RNA components. In cesium sulfate density gradients, the enzyme has a buoyant density of 1.23 g/ml, indicating a low RNA/protein ratio for the holoenzyme.
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Affiliation(s)
- C Stathopoulos
- Laboratory of Biological Chemistry, School of Medicine, University of Patras, Rio-Patras, Greece
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10
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Zimmerly S, Drainas D, Sylvers LA, Söll D. Identification of a 100-kDa protein associated with nuclear ribonuclease P activity in Schizosaccharomyces pombe. EUROPEAN JOURNAL OF BIOCHEMISTRY 1993; 217:501-7. [PMID: 8223594 DOI: 10.1111/j.1432-1033.1993.tb18270.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Ribonuclease P from the fission yeast Schizosaccharomyces pombe has been purified to apparent homogeneity. A purification of 23,000-fold was achieved by four fractionation steps with DEAE-cellulose chromatography, phosphocellulose chromatography, glycerol-gradient fractionation and finally tRNA-affinity chromatography. A 100-kDa protein was present in the most pure preparations in amounts approximately stoichiometric with the previously identified RNA components of the enzyme, K1-RNA and K2-RNA [Krupp, G., Cherayil, B., Frendeway, D., Nishikawa, S. & Söll, D. (1986) EMBO J. 5, 1697-1703]. A cross-linking experiment utilizing a 4-thiouridine-substituted precursor tRNA demonstrated that the 100-kDa protein interacts with the ribonuclease P substrate in a specific fashion. We therefore conclude that the protein component of S. pombe ribonuclease P is a 100-kDa protein.
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Affiliation(s)
- S Zimmerly
- Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06520-8114
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11
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Darr SC, Pace B, Pace NR. Characterization of ribonuclease P from the archaebacterium Sulfolobus solfataricus. J Biol Chem 1990. [DOI: 10.1016/s0021-9258(19)38248-1] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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12
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Structural differences between ribosomes of various eukaryotes: stability, density, mass, size and structure in solution of cytoplasmic ribosomes from Tetrahumena, Artemia and Euglena. Int J Biol Macromol 1983. [DOI: 10.1016/0141-8130(83)90061-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Upreti RK, Holoubek V. The effect of partial hepatectomy and chronic alcohol administration on the population of basic polypeptides of rat liver nuclear ribonucleoprotein monoparticles. PHARMACOLOGICAL RESEARCH COMMUNICATIONS 1982; 14:689-99. [PMID: 6890689 DOI: 10.1016/s0031-6989(82)80074-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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14
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Upreti RK, Holoubek V. Methylation of proteins of the nuclear ribonucleoprotein particles in liver and kidney of rats injected with actinomycin D. Biochimie 1982; 64:435-42. [PMID: 7115786 DOI: 10.1016/s0300-9084(82)80582-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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15
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Upreti RK, Holoubek V. The effect of inhibition of RNA synthesis by actinomycin D on the population of basic polypeptides of the 30S unclear ribonucleoprotein particles. Biochimie 1982; 64:247-54. [PMID: 6178441 DOI: 10.1016/s0300-9084(82)80491-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
In rats injected intraperitoneally with actinomycin D (2 mg/kg body weight) 12 h earlier, the yield of the 30S ribonucleoprotein particles isolated from liver nuclei by extraction with 0.1 M NaCl at pH 8.0 decreased by 60 per cent. The protein-to-RNA ratio of these particles increased to 32:1 from the ratio 4.4:1 found in the same particles isolated from the nuclei of liver of control rats. The particles isolated from the liver nuclei of rats injected with actinomycin D were depleted of all charge isomers of the two most prominent polypeptides (33,000 and 39,000 daltons) present in the particles of liver of control animals. The most abundant protein in these particles was a 43,000 dalton polypeptide. This polypeptide is the least prominent of the 3 major polypeptides present in the control particles. The same charge isomers of the 43,000 dalton polypeptide were present in the nuclear ribonucleoprotein particles isolated from the liver of control animals and from the liver of animals treated with actinomycin D 12 h earlier. In control animals the nuclear ribonucleoprotein monoparticles isolated from kidney contained 3 major polypeptides of the same molecular weight with the same distribution of their charge isomers as were present in the particles isolated from liver nuclei. The injection of actinomycin D 12 h earlier was without any effect on the protein composition of the 30S nuclear ribonucleoprotein particles of rat kidney.
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16
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Nieuwenhuysen P, Clauwaert J. Physicochemical characterization of ribosomal particles from the eukaryote Artemia. J Biol Chem 1981. [DOI: 10.1016/s0021-9258(19)68808-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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17
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Reboud A, Dubost S, Buisson M, Reboud J. tRNA binding stabilizes rat liver 60 S ribosomal subunits during treatment with LiCl. J Biol Chem 1980. [DOI: 10.1016/s0021-9258(18)43668-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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18
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De Herdt E, Slegers H, Kondo M. Identification and characterization of a 19-S complex containing a 27 000-Mr protein in Artemia salina. EUROPEAN JOURNAL OF BIOCHEMISTRY 1979; 96:423-30. [PMID: 111924 DOI: 10.1111/j.1432-1033.1979.tb13054.x] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The cytoplasm of the cryptobiotic Artemia salina gastrula contains a large quantity of a unique 19-S complex. This particle is a specific aggregated form of a 27 000-Mr protein, having a molecular weight of 10(6) and an apparent buoyant density of 1.25 -- 1.26 g/cm3 in sucrose and 1.31 g/cm3 in CsCl. The relative quantity of this 19-S complex decreases significantly with respect to 80-S monoribosomes during the postgastrula development. Biochemical and immunological studies indicate that the 27 000-Mr protein is one of the RNA-binding proteins [Ovchinnikov et al., FEBS Lett. 88, 21 -- 26 (1978)] but is absent in the protein components associated with poly(A)-containing ribonucleoprotein complexes. The possibility is also suggested that the 27 000-Mr protein and Artemia elongation factor eEF-Ts might be related to each other on the basis of amino acid composition and immunological cross-reactivity.
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19
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Nieuwenhuysen P. Determination of small differences in buoyant density of macromolecules by analytical density gradient equilibrium centrifugation. JOURNAL OF BIOCHEMICAL AND BIOPHYSICAL METHODS 1979; 1:3-8. [PMID: 95253 DOI: 10.1016/0165-022x(79)90041-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A sensitive method is proposed for the determination of small differences between the buoyant densities of different species of monodisperse macromolecules by analytical density gradient equilibrium centrifugation. The procedure involves the measurement at sedimentation equilibrium of the bandwidths of the concentration distribution of the separate macromolecules and of a mixture of the different species. The difference in buoyant densities can then be estimated from the difference between the bandwidths.
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20
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Nieuwenhuysen P, de Herdt E, Clauwaert J. Ribonucleic acid and protein content of eukaryotic ribosomes isolated from Artemia salina. Anal Biochem 1978; 88:532-8. [PMID: 697021 DOI: 10.1016/0003-2697(78)90453-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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21
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Patel NT, Holoubek V. Protein composition of liver nuclear ribonucleoportein particles of rats fed carcinogenic aminoazo dyes. Biochem Biophys Res Commun 1976; 73:112-9. [PMID: 826249 DOI: 10.1016/0006-291x(76)90504-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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22
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Bondy SC, Purdy JL. Migration of ribosomes along the axons of the chick visual pathway. BIOCHIMICA ET BIOPHYSICA ACTA 1975; 390:332-41. [PMID: 47765 DOI: 10.1016/0005-2787(75)90354-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The axoplasmic migration of ribosomes has been detected in the visual system of the chick. Monocular injection of radioactive uridine or an amino acid mixture was followed by sedimentation analysis in sucrose or cesium sulfate density gradients, of ribosomes prepared from the retinae of injected eyes and the left and right optic lobes. By this means both RNA and protein components of ribosomes were found to migrate from the retina to the innervated contralateral optic lobe. Following denervation of the distal nerve segment by eye removal, the stability of the transported RNA was reduced, suggesting its presynaptic location. The transport of RNA was not significantly imparied by intraocular injection of inhibitors of informational RNA or mitochondrial RNA synthesis prior to injection of radioactive uridine but was depressed by a low dose of actinomycin D.
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23
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Leister DE, Dawid IB. Physical Properties and Protein Constituents of Cytoplasmic and Mitochondrial Ribosomes of Xenopus laevis. J Biol Chem 1974. [DOI: 10.1016/s0021-9258(19)42334-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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24
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Kanda F, Ochiai H, Iwabuchi M. Molecular-weight determinations and stoichiometric measurements of 40-S and 60-S ribosomal proteins of the cellular slime mold Dictyostelium discoideum. EUROPEAN JOURNAL OF BIOCHEMISTRY 1974; 44:469-79. [PMID: 4858001 DOI: 10.1111/j.1432-1033.1974.tb03505.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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