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Kumagai F, Hasezawa S, Takahashi Y, Nagata T. The Involvement of Protein Synthesis Elongation Factor 1α in the Organization of Microtubules on the Perinuclear Region during the Cell Cycle Transition from M Phase to G1Phase in Tobacco BY-2 Cells. ACTA ACUST UNITED AC 2014. [DOI: 10.1111/j.1438-8677.1995.tb00523.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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2
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Bhatia SS, Weiss TC, Romaniuk PJ. Contribution of Individual Amino Acids to the 5S RNA Binding Activity of the Xenopus Zinc Finger Protein p43. Biochemistry 2008; 47:8398-405. [DOI: 10.1021/bi800080c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Simran S. Bhatia
- Department of Biochemistry and Microbiology, University of Victoria, PO Box 3055, Victoria, BC V8W 3P6, Canada
| | - Tristen C. Weiss
- Department of Biochemistry and Microbiology, University of Victoria, PO Box 3055, Victoria, BC V8W 3P6, Canada
| | - Paul J. Romaniuk
- Department of Biochemistry and Microbiology, University of Victoria, PO Box 3055, Victoria, BC V8W 3P6, Canada
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3
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Josefsberg Ben-Yehoshua L, Lewellyn AL, Thomas P, Maller JL. The role of Xenopus membrane progesterone receptor beta in mediating the effect of progesterone on oocyte maturation. Mol Endocrinol 2006; 21:664-73. [PMID: 17185392 DOI: 10.1210/me.2006-0256] [Citation(s) in RCA: 86] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
Rapid, nongenomic membranal effects of progesterone were demonstrated in amphibian oocytes more than 30 y ago. Recently, a distinct family of membrane progestin receptors (mPRs) has been cloned in fish and other vertebrate species. In this study we explore the role of mPR in promoting oocyte maturation in Xenopus laevis. RT-PCR analysis indicates that Xenopus oocytes contain transcripts for the mPRbeta ortholog, similar to what has been reported in zebrafish oocytes, and Western blotting shows that the protein is expressed on the oocyte plasma membrane. Microinjection of mPRbeta-specific antibodies into oocytes resulted in a dramatic inhibition of progesterone-dependent oocyte maturation, whereas microinjection of mRNA encoding Myc-Xenopus mPR (XmPR)beta resulted in an accelerated rate of progesterone-induced oocyte maturation, concomitant with membranal localization of the protein. Binding studies in mammalian cells expressing XmPRbeta confirmed specific binding of progesterone by the expressed protein. These results suggest that XmPRbeta is a physiological progesterone receptor involved in initiating the resumption of meiosis during maturation of Xenopus oocytes.
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Affiliation(s)
- Liat Josefsberg Ben-Yehoshua
- Howard Hughes Medical Institute, Department of Pharmacology, University of Colorado School of Medicine, Aurora, Colorado 80045, USA
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4
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Klann A, Levy G, Lutz I, Müller C, Kloas W, Hildebrandt JP. Estrogen-like effects of ultraviolet screen 3-(4-methylbenzylidene)-camphor (Eusolex 6300) on cell proliferation and gene induction in mammalian and amphibian cells. ENVIRONMENTAL RESEARCH 2005; 97:274-281. [PMID: 15589235 DOI: 10.1016/j.envres.2004.07.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2003] [Revised: 06/11/2004] [Accepted: 07/07/2004] [Indexed: 05/24/2023]
Abstract
We tested the ultraviolet screen 3-(4-methylbenzylidene)-camphor (4-MBC; Eusolex 6300), which has been implicated as a potential endocrine disruptor, for its potential to bind to and activate endogenous estrogen receptors (ER) and to mediate ER-dependent changes in gene transcription, in hepatocytes of the water-dwelling South African clawed frog Xenopus laevis. We were able to confirm previous findings that 4-MBC accelerates cell proliferation in estrogen-dependent human breast cancer cells (MCF-7). Results of competitive binding assays of [3H]17beta-estradiol and 4-MBC using cytosolic protein preparations from Xenopus hepatocytes indicated that 4-MBC weakly binds to the ER. 4-MBC at a concentration of 100 micromol/L is not able to completely replace estradiol from the receptor. However, when 4-MBC was tested in a gene induction assay using the relative amount of ER transcript as a marker for ER-dependent transcriptional activation, we found that micromolar concentrations of this substance produced an increase in the amount of ER mRNA that was not different from the amount of mRNA that was observed upon activation of cells with 17beta-estradiol in concentrations above 1 nmol/L. The results indicate that 4-MBC has the potential to change physiological and developmental processes mediated by ER signaling mechanisms. It may therefore be a potentially harmful substance for water-dwelling animals when present in the environment at micromolar concentrations.
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Affiliation(s)
- Anja Klann
- Zoological Institute, Ernst Moritz Arndt-University, JS Bach-Strasse 11/12, D-17487 Greifswald, Germany
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5
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Negrutskii BS, El'skaya AV. Eukaryotic translation elongation factor 1 alpha: structure, expression, functions, and possible role in aminoacyl-tRNA channeling. PROGRESS IN NUCLEIC ACID RESEARCH AND MOLECULAR BIOLOGY 1998; 60:47-78. [PMID: 9594571 DOI: 10.1016/s0079-6603(08)60889-2] [Citation(s) in RCA: 154] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
This review offers a comprehensive analysis of eukaryotic translation elongation factor 1 (eEF-1 alpha) in comparison with its bacterial counterpart EF-Tu. Altogether, the data presented indicate some variances in the elongation process in prokaryotes and eukaryotes. The differences may be attributed to translational channeling and compartmentalization of protein synthesis in higher eukaryotic cells. The functional importance of the EF-1 multisubunit complex and expression of its subunits under miscellaneous cellular conditions are reviewed. A number of novel functions of EF-1 alpha, which may contribute to the coordinate regulation of multiple cellular processes including growth, division, and transformation, are characterized.
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Affiliation(s)
- B S Negrutskii
- Institute of Molecular Biology and Genetics, National Academy of Sciences of Ukraine, Kiev, Ukraine
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6
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Kristensen P, Lund A, Clark BF, Cavallius J, Merrick WC. Purification and characterisation of a tissue specific elongation factor 1 alpha (EF-1 alpha 2) from rabbit muscle. Biochem Biophys Res Commun 1998; 245:810-4. [PMID: 9588196 DOI: 10.1006/bbrc.1998.8510] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The peptide elongation factor 1 alpha (EF-1 alpha) has been isolated and characterised from a number of species. Recently we and others have reported the existence of an isoform of the ubiquitously expressed EF-1 alpha mRNA in higher eukaryotes, including human cells. This isoform has a tissue specific expression pattern, confining it primarily to muscle, heart, and brain. In the present study we have purified the isoform of EF-1 alpha from rabbit muscle. Using partial amino acid analysis, we can conclude that in rabbit muscle essentially only the isoform of elongation factor 1 alpha, designated EF-1 alpha 2, is translated. Preliminary activity assays show that the isoform has the same functional activities as the normal EF-1 alpha, designated EF-1 alpha 1, in relation to protein synthesis, but may behave differently in the ability to bind nucleotides. Based on the availability of the isoforms of EF-1 alpha purified from a mammalian species, it will be possible to conduct further comparative studies in order to elucidate the different functions of EF-1 alpha 1 and EF-1 alpha 2 proteins.
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Affiliation(s)
- P Kristensen
- Department of Chemistry, University of Aarhus, Denmark.
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7
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Numata O. Multifunctional proteins in Tetrahymena: 14-nm filament protein/citrate synthase and translation elongation factor-1 alpha. INTERNATIONAL REVIEW OF CYTOLOGY 1996; 164:1-35. [PMID: 8575889 DOI: 10.1016/s0074-7696(08)62383-9] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
One gene encoding a protein has been shown to have two entirely different functions. Such a phenomenon, which has been called "gene sharing," was first known in crystallins. We found two multifunctional proteins in the ciliated protozoan Tetrahymena: 14-nm filament protein and protein translation elongation factor 1-alpha (EF-1 alpha). The 14-nm filament protein has dual functions as a citrate synthase in mitochondria and as a cytoskeletal protein in cytoplasm. In cytoplasm, the 14-nm filament protein was involved in oral morphogenesis and in pronuclear behavior during conjugation. The observation that Tetrahymena intramitochondrial filamentous inclusions contain the 14-nm filament protein and that the citrate synthase activity of the 14-nm filament protein is decreased by polymerization and increased by depolymerization, suggests a possible modulating mechanism of citrate synthase activity by monomer-polymer conversion in mitochondria in situ. The EF-1 alpha functions as an F-actin-bundling protein and a 14-nm filament-associated protein as well as an elongation factor in protein synthesis. The F-actin-bundling activity of EF-1 alpha was regulated by Ca2+ and calmodulin. Here we review the properties and functions of two multifunctional proteins in Tetrahymena.
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Affiliation(s)
- O Numata
- Institute of Biological Sciences, University of Tsukuba, Ibaraki, Japan
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8
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Wells J, Henkler F, Leversha M, Koshy R. A mitochondrial elongation factor-like protein is over-expressed in tumours and differentially expressed in normal tissues. FEBS Lett 1995; 358:119-25. [PMID: 7828719 DOI: 10.1016/0014-5793(94)01403-n] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The tissue-specific expression of an antigen (P43) ubiquitously expressed at high levels in a variety of tumours of human and animal origin was investigated using a monoclonal antibody to P43. Whereas low amounts of P43 are expressed in the spleen, skeletal muscle and pancreas, P43 is abundantly produced in the liver and in other tissues such as the kidney, heart and brain which have levels of oxidative metabolism. Interestingly, a related protein of higher molecular weight is abundantly expressed in the lung and in amounts which were higher than those observed with other tissues. The human cDNA for P43 was isolated from a human liver cDNA library and mapped to chromosome 16 between p11.2 and 12 and also to a position near the centromere on the long arm of chromosome 17. The deduced amino acid sequence of P43 is remarkably similar to that of E. coli EF-Tu and the mitochondrial EF-Tu of S. cerevisiae with the structurally and functionally important amino acids of EF-Tu being completely conserved in P43. A comparison of the distribution of P43 and a mitochondrial protein Hsp 60 among different cellular fractions indicated a likely mitochondrial localisation for P43. Taken together these results suggest that P43 is a human mitochondrial elongation factor.
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MESH Headings
- Amino Acid Sequence
- Animals
- Antigens, Neoplasm/biosynthesis
- Base Sequence
- Blotting, Northern
- Blotting, Southern
- Cells, Cultured
- Chromosome Mapping
- Chromosomes, Human, Pair 16
- Chromosomes, Human, Pair 17
- DNA, Complementary
- Humans
- In Situ Hybridization
- Male
- Mice
- Mitochondria/metabolism
- Mitochondrial Proteins
- Molecular Sequence Data
- Peptide Elongation Factor Tu/biosynthesis
- Peptide Elongation Factors/biosynthesis
- Sequence Homology, Amino Acid
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Affiliation(s)
- J Wells
- Department of Pathology, University of Cambridge, UK
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9
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Shiina N, Gotoh Y, Kubomura N, Iwamatsu A, Nishida E. Microtubule severing by elongation factor 1 alpha. Science 1994; 266:282-5. [PMID: 7939665 DOI: 10.1126/science.7939665] [Citation(s) in RCA: 205] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
An activity that severs stable microtubules is thought to be involved in microtubule reorganization during the cell cycle. Here, a 48-kilodalton microtubule-severing protein was purified from Xenopus eggs and identified as translational elongation factor 1 alpha (EF-1 alpha). Bacterially expressed human EF-1 alpha also displayed microtubule-severing activity in vitro and, when microinjected into fibroblasts, induced rapid and transient fragmentation of cytoplasmic microtubule arrays. Thus, EF-1 alpha, an essential component of the eukaryotic translational apparatus, appears to have a second role as a regulator of cytoskeletal rearrangements.
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Affiliation(s)
- N Shiina
- Department of Genetics and Molecular Biology, Kyoto University, Japan
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10
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Yang W, Burkhart W, Cavallius J, Merrick W, Boss W. Purification and characterization of a phosphatidylinositol 4-kinase activator in carrot cells. J Biol Chem 1993. [DOI: 10.1016/s0021-9258(18)54163-6] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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11
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Abrahamsen MS, Clark TG, Mascolo P, Speer CA, White MW. Developmental gene expression in Eimeria bovis. Mol Biochem Parasitol 1993; 57:1-14. [PMID: 8426605 DOI: 10.1016/0166-6851(93)90239-t] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
By differential screening of stage-specific cDNA libraries of Eimeria bovis, we have identified and isolated a large set of genes that are regulated during development of the sporozoites and merozoites. Duplicate lifts of cDNA libraries constructed from partially sporulated oocysts and merozoites were probed with radioactively labeled first-strand cDNA prepared from partially sporulated oocyst and merozoite mRNA. Out of 60,000 plaques screened in each case, over 250 plaques from the partially sporulated oocyst library preferentially hybridized with the oocyst cDNA probe and 67 plaques from the merozoite library preferentially hybridized with the merozoite cDNA probe. Three of the oocyst phage and 7 of the merozoite phage were selected for further characterization. Northern analysis revealed a common pattern of mRNA expression for the oocyst cDNA clones. Consistent with the results of the differential screen, no hybridization to merozoite RNA was detected with any of these 3 oocyst cDNA clones. The expression of the merozoite cDNA clones was more complex, with 3 different classes of merozoite genes being identified based on their pattern of developmental regulation. Although each of the merozoite clones was expressed to some extent during sporulation, in all cases, expression was higher in merozoites than in partially sporulated oocysts, consistent with the restriction of expression defined by the differential screen. Sequence analysis revealed that 2 of the merozoite cDNA clones encode elongation factor 1 alpha and the ubiquitin/ribosomal protein fusion, and 1 of the sporozoite cDNAs displays a significant identity to insulin-degrading enzyme. The developmental expression of E. bovis genes involved in protein synthesis and degradation provides additional evidence for the importance of regulation of protein metabolism during parasite development.
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Affiliation(s)
- M S Abrahamsen
- Veterinary Molecular Biology, Montana State University, Bozeman 59717
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12
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Tissue-specific expression in mammalian brain, heart, and muscle of S1, a member of the elongation factor-1 alpha gene family. J Biol Chem 1992. [DOI: 10.1016/s0021-9258(18)35946-5] [Citation(s) in RCA: 95] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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13
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Kurasawa Y, Numata O, Katoh M, Hirano H, Chiba J, Watanabe Y. Identification of Tetrahymena 14-nm filament-associated protein as elongation factor 1 alpha. Exp Cell Res 1992; 203:251-8. [PMID: 1385189 DOI: 10.1016/0014-4827(92)90062-d] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Tetrahymena 14-nm filament-forming protein has dual functions as a citrate synthase in mitochondria and as a cytoskeletal protein involved in oral morphogenesis and in pronuclear behavior during conjugation. By immunoblotting using monoclonal and polyclonal antibodies following two-dimensional gel electrophoresis, we demonstrated that the 14-nm filament protein fraction contained two 49-kDa proteins whose isoelectric points were 8.0 and 9.0; a monoclonal antibody (MAb) 26B4 and a polyclonal antibody 49KI reacted only to a pI 8.0 protein, while two other MAbs, 11B6 and 11B8, reacted only to a pI 9.0 protein. From the N-terminal amino acid sequences, the pI 8.0 protein was identified as the previously reported 14-nm filament-forming protein/citrate synthase, but the pI 9.0 protein N-terminal sequence had no similarity with that of the pI 8.0 protein. The pI 9.0 protein is considered to be a 14-nm filament-associated protein since the pI 9.0 protein copurifies with the pI 8.0 protein during two cycles of an assembly and disassembly purification protocol. Cloning and sequencing the pI 9.0 protein gene from a Tetrahymena pyriformis cDNA library, we identified the pI 9.0 protein as elongation factor 1 alpha (EF-1 alpha) based on it sharing 73-76% sequence identity with EF-1 alpha from several species.
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Affiliation(s)
- Y Kurasawa
- Institute of Biological Sciences, University of Tsukuba, Ibaraki, Japan
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14
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Frydenberg J, Poulsen K, Petersen AK, Lund A, Olesen OF. Isolation and characterization of the gene encoding EF-1 alpha O, an elongation factor 1-alpha expressed during early development of Xenopus laevis. Gene X 1991; 109:185-92. [PMID: 1765266 DOI: 10.1016/0378-1119(91)90608-e] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
In Xenopus laevis, the gene encoding the elongation factor 1-alpha variant EF-1 alpha O, where O stands for oocyte, is expressed in oocytes and early embryos. A genomic library from X. laevis was screened with a cDNA probe coding for EF-1 alpha O. Two recombinant phages were isolated, one of which carries an entire EF-1 alpha O gene. This clone was characterized by restriction enzyme mapping and sequencing. Comparison of cDNA and genomic sequences revealed that EF-1 alpha O consists of seven exons spanning about 6.5 kb. The structure of the gene is very homologous to the human EF-1 alpha gene, as all locations of the splice junctions are conserved between the two genes. The sequence immediately upstream from the transcription start point (tsp) contains a CCAAT box, but does not contain either a TATA box or a Sp1-binding site. Interestingly, this sequence has a sequence homologous to the negative regulatory element from the TFIIIA promoter. A region located about 400 bp upstream from the tsp contains an additional number of possible regulatory sequence elements. The first intron contains G + C-rich elements which exist both isolated and as part of longer inverted repeats. Furthermore, one octamer and four Sp1-binding sites are found in this intron.
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Affiliation(s)
- J Frydenberg
- Division of Biostructural Chemistry, Aarhus University, Denmark
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Deschamps S, Morales J, Mazabraud A, le Maire M, Denis H, Brown DD. Two forms of elongation factor 1 alpha (EF-1 alpha O and 42Sp50), present in oocytes, but absent in somatic cells of Xenopus laevis. J Cell Biol 1991; 114:1109-11. [PMID: 1894690 PMCID: PMC2289126 DOI: 10.1083/jcb.114.6.1109] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
We have purified and partially sequenced the EF-1 alpha protein from Xenopus laevis oocytes (EF-1 alpha O). We show that the two cDNA clones isolated by Coppared et al. (Coppard, N. J., K. Poulsen, H. O. Madsen, J. Frydenberg, and B. F. C. Clark. 1991. J. Cell Biol. 112:237-243) do not encode 42Sp50, as claimed by these authors, but two very similar forms of EF-1 alpha O (EF-1 alpha O and EF-1 alpha O1). 42Sp50 is the major protein component of a 42S nucleoprotein particle that is very abundant in previtellogenic oocytes of X. laevis, 42Sp50 differs from EF-1 alpha O not only by its amino acid sequence, but also by several properties already reported. In particular, 42Sp50 has a low EF-1 alpha activity. It is distributed uniformly in the cytoplasm of previtellogenic oocytes, in contrast to EF-1 alpha O which is concentrated in a small region of the cytoplasm, known as the mitochondrial mass or Balbiani body.
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Affiliation(s)
- S Deschamps
- Centre de Génétique Moléculaire, Université Pierre et Marie Curie, Gif-sur-Yvette, France
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