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  • 1
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    Development, Testing, And Deployment of an Air Sampling Manifold for Spiking Elemental and Oxidized Mercury During the Reno Atmospheric Mercury Intercomparison Experiment (RAMIX) (2013)
    American Chemical Society (ACS)
    Details
    Publication Date: 2013-03-22
    Description: Environmental Science & Technology DOI: 10.1021/es304185a
    Print ISSN: 0013-936X
    Electronic ISSN: 1520-5851
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Published by American Chemical Society (ACS)
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  • 2
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    UBE2O remodels the proteome during terminal erythroid differentiation (2017)
    American Association for the Advancement of Science (AAAS)
    In: Science
    Details
    Publication Date: 2017-08-04
    Description: During terminal differentiation, the global protein complement is remodeled, as epitomized by erythrocytes, whose cytosol is ~98% globin. The erythroid proteome undergoes a rapid transition at the reticulocyte stage; however, the mechanisms driving programmed elimination of preexisting cytosolic proteins are unclear. We found that a mutation in the murine Ube2o gene, which encodes a ubiquitin-conjugating enzyme induced during erythropoiesis, results in anemia. Proteomic analysis suggested that UBE2O is a broad-spectrum ubiquitinating enzyme that remodels the erythroid proteome. In particular, ribosome elimination, a hallmark of reticulocyte differentiation, was defective in Ube2o –/– mutants. UBE2O recognized ribosomal proteins and other substrates directly, targeting them to proteasomes for degradation. Thus, in reticulocytes, the induction of ubiquitinating factors may drive the transition from a complex to a simple proteome.
    Keywords: Biochemistry, Cell Biology, Online Only
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Geosciences , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    Role of a ubiquitin-like modification in polarized morphogenesis (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-03-30
    Description: Type I ubiquitin-like proteins constitute a family of protein modifiers. Here we report the identification of a posttranslational protein modifier from Saccharomyces cerevisiae, Hub1. Overexpression of Hub1 resulted in enhanced conjugate formation when its carboxyl-terminal residue was deleted, suggesting that mature Hub1 may be produced by proteolytic processing. In vivo targets of Hub1 conjugation included cell polarity factors Sph1 and Hbt1. In the hub1Delta mutant, the subcellular localization of both Hbt1 and Sph1 was disrupted, and cell polarization during the formation of mating projections was defective. Consistent with these polarization defects, the hub1Delta mutant was deficient in mating.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dittmar, Gunnar A G -- Wilkinson, Caroline R M -- Jedrzejewski, Paul T -- Finley, Daniel -- GM58223/GM/NIGMS NIH HHS/ -- GM62663/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2002 Mar 29;295(5564):2442-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11923536" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Biological Evolution ; *Cell Polarity ; Electrophoresis, Gel, Two-Dimensional ; Gene Deletion ; Genes, Fungal ; Humans ; Ligases/chemistry/genetics/*metabolism ; Mass Spectrometry ; *Microfilament Proteins ; Molecular Sequence Data ; Morphogenesis ; Mutation ; Peptides/pharmacology ; Phenotype ; Protein Processing, Post-Translational ; Recombinant Fusion Proteins/metabolism ; Saccharomyces cerevisiae/genetics/growth & development/*physiology ; Saccharomyces cerevisiae Proteins/chemistry/genetics/*metabolism ; Schizosaccharomyces/genetics ; Sequence Alignment ; Subcellular Fractions/metabolism ; Ubiquitin/chemistry/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Proteasome subunit Rpn13 is a novel ubiquitin receptor (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-05-24
    Description: Proteasomal receptors that recognize ubiquitin chains attached to substrates are key mediators of selective protein degradation in eukaryotes. Here we report the identification of a new ubiquitin receptor, Rpn13/ARM1, a known component of the proteasome. Rpn13 binds ubiquitin through a conserved amino-terminal region termed the pleckstrin-like receptor for ubiquitin (Pru) domain, which binds K48-linked diubiquitin with an affinity of approximately 90 nM. Like proteasomal ubiquitin receptor Rpn10/S5a, Rpn13 also binds ubiquitin-like (UBL) domains of UBL-ubiquitin-associated (UBA) proteins. In yeast, a synthetic phenotype results when specific mutations of the ubiquitin binding sites of Rpn10 and Rpn13 are combined, indicating functional linkage between these ubiquitin receptors. Because Rpn13 is also the proteasomal receptor for Uch37, a deubiquitinating enzyme, our findings suggest a coupling of chain recognition and disassembly at the proteasome.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2839886/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2839886/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Husnjak, Koraljka -- Elsasser, Suzanne -- Zhang, Naixia -- Chen, Xiang -- Randles, Leah -- Shi, Yuan -- Hofmann, Kay -- Walters, Kylie J -- Finley, Daniel -- Dikic, Ivan -- CA097004/CA/NCI NIH HHS/ -- GM008700/GM/NIGMS NIH HHS/ -- GM043601/GM/NIGMS NIH HHS/ -- R01 CA097004/CA/NCI NIH HHS/ -- R01 CA097004-05/CA/NCI NIH HHS/ -- R01 CA097004-06A1/CA/NCI NIH HHS/ -- R37 GM043601/GM/NIGMS NIH HHS/ -- R37 GM043601-17/GM/NIGMS NIH HHS/ -- T32 GM008700/GM/NIGMS NIH HHS/ -- T32 GM008700-09/GM/NIGMS NIH HHS/ -- England -- Nature. 2008 May 22;453(7194):481-8. doi: 10.1038/nature06926.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Biochemistry II and Cluster of Excellence Macromolecular Complexes, Goethe University, Theodor-Stern-Kai 7, D-60590 Frankfurt (Main), Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18497817" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding Sites/genetics ; Cell Adhesion Molecules/chemistry/genetics/metabolism ; Humans ; Membrane Glycoproteins/chemistry/genetics/metabolism ; Mice ; Molecular Sequence Data ; Mutation/genetics ; Phenotype ; Proteasome Endopeptidase Complex/*chemistry/genetics/*metabolism ; Protein Subunits/chemistry/genetics/metabolism ; Saccharomyces cerevisiae Proteins/chemistry/genetics/metabolism ; Ubiquitin/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 5
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    Ubiquitin docking at the proteasome through a novel pleckstrin-homology domain interaction (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-05-24
    Description: Targeted protein degradation is largely performed by the ubiquitin-proteasome pathway, in which substrate proteins are marked by covalently attached ubiquitin chains that mediate recognition by the proteasome. It is currently unclear how the proteasome recognizes its substrates, as the only established ubiquitin receptor intrinsic to the proteasome is Rpn10/S5a (ref. 1), which is not essential for ubiquitin-mediated protein degradation in budding yeast. In the accompanying manuscript we report that Rpn13 (refs 3-7), a component of the nine-subunit proteasome base, functions as a ubiquitin receptor, complementing its known role in docking de-ubiquitinating enzyme Uch37/UCHL5 (refs 4-6) to the proteasome. Here we merge crystallography and NMR data to describe the ubiquitin-binding mechanism of Rpn13. We determine the structure of Rpn13 alone and complexed with ubiquitin. The co-complex reveals a novel ubiquitin-binding mode in which loops rather than secondary structural elements are used to capture ubiquitin. Further support for the role of Rpn13 as a proteasomal ubiquitin receptor is demonstrated by its ability to bind ubiquitin and proteasome subunit Rpn2/S1 simultaneously. Finally, we provide a model structure of Rpn13 complexed to diubiquitin, which provides insights into how Rpn13 as a ubiquitin receptor is coupled to substrate deubiquitination by Uch37.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2825158/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2825158/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schreiner, Patrick -- Chen, Xiang -- Husnjak, Koraljka -- Randles, Leah -- Zhang, Naixia -- Elsasser, Suzanne -- Finley, Daniel -- Dikic, Ivan -- Walters, Kylie J -- Groll, Michael -- CA097004/CA/NCI NIH HHS/ -- GM008700/GM/NIGMS NIH HHS/ -- GM43601/GM/NIGMS NIH HHS/ -- R01 CA097004/CA/NCI NIH HHS/ -- R01 CA097004-05/CA/NCI NIH HHS/ -- R01 CA097004-06A1/CA/NCI NIH HHS/ -- R37 GM043601/GM/NIGMS NIH HHS/ -- R37 GM043601-17/GM/NIGMS NIH HHS/ -- T32 GM008700/GM/NIGMS NIH HHS/ -- T32 GM008700-09/GM/NIGMS NIH HHS/ -- England -- Nature. 2008 May 22;453(7194):548-52. doi: 10.1038/nature06924.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Integrated Protein Science at the Department Chemie, Lehrstuhl fur Biochemie, Technische Universitat Munchen, Lichtenbergstrasse 4, D-85747 Garching, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18497827" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Animals ; Cell Adhesion Molecules/*chemistry/genetics/*metabolism ; Crystallography, X-Ray ; Humans ; Membrane Glycoproteins/chemistry/genetics/metabolism ; Mice ; Models, Molecular ; Nuclear Magnetic Resonance, Biomolecular ; Proteasome Endopeptidase Complex/*chemistry/*metabolism ; Protein Binding ; Protein Structure, Tertiary ; Protein Subunits/chemistry/genetics/metabolism ; Ubiquitin/chemistry/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
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    Chaperone-mediated pathway of proteasome regulatory particle assembly (2009)
    Nature Publishing Group (NPG)
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    Publication Date: 2009-05-05
    Description: The proteasome is a protease that controls diverse processes in eukaryotic cells. Its regulatory particle (RP) initiates the degradation of ubiquitin-protein conjugates by unfolding the substrate and translocating it into the proteasome core particle (CP) to be degraded. The RP has 19 subunits, and their pathway of assembly is not understood. Here we show that in the yeast Saccharomyces cerevisiae three proteins are found associated with RP but not with the RP-CP holoenzyme: Nas6, Rpn14 and Hsm3. Mutations in the corresponding genes confer proteasome loss-of-function phenotypes, despite their virtual absence from the holoenzyme. These effects result from deficient RP assembly. Thus, Nas6, Rpn14 and Hsm3 are RP chaperones. The RP contains six ATPases-the Rpt proteins-and each RP chaperone binds to the carboxy-terminal domain of a specific Rpt. We show in an accompanying study that RP assembly is templated through the Rpt C termini, apparently by their insertion into binding pockets in the CP. Thus, RP chaperones may regulate proteasome assembly by directly restricting the accessibility of Rpt C termini to the CP. In addition, competition between the RP chaperones and the CP for Rpt engagement may explain the release of RP chaperones as proteasomes mature.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2727592/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2727592/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roelofs, Jeroen -- Park, Soyeon -- Haas, Wilhelm -- Tian, Geng -- McAllister, Fiona E -- Huo, Ying -- Lee, Byung-Hoon -- Zhang, Fan -- Shi, Yigong -- Gygi, Steven P -- Finley, Daniel -- 5F32GM75737-2/GM/NIGMS NIH HHS/ -- GM043601/GM/NIGMS NIH HHS/ -- GM67945/GM/NIGMS NIH HHS/ -- R37 GM043601/GM/NIGMS NIH HHS/ -- R37 GM043601-19/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Jun 11;459(7248):861-5. doi: 10.1038/nature08063.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19412159" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases/chemistry/metabolism ; Carrier Proteins/genetics/metabolism ; Conserved Sequence ; Evolution, Molecular ; Holoenzymes/chemistry/metabolism ; Humans ; Models, Molecular ; Molecular Chaperones/genetics/*metabolism ; Mutation ; Phenotype ; Proteasome Endopeptidase Complex/*chemistry/genetics/*metabolism ; Protein Binding ; Protein Structure, Tertiary ; Proto-Oncogene Proteins/genetics/metabolism ; Saccharomyces cerevisiae/*enzymology/genetics ; Saccharomyces cerevisiae Proteins/genetics/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
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    Hexameric assembly of the proteasomal ATPases is templated through their C termini (2009)
    Nature Publishing Group (NPG)
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    Publication Date: 2009-05-05
    Description: Substrates of the proteasome are recognized and unfolded by the regulatory particle, and then translocated into the core particle (CP) to be degraded. A hetero-hexameric ATPase ring, containing subunits Rpt1-6, is situated within the base subassembly of the regulatory particle. The ATPase ring sits atop the CP, with the Rpt carboxy termini inserted into pockets in the CP. Here we identify a previously unknown function of the Rpt proteins in proteasome biogenesis through deleting the C-terminal residue from each Rpt in the yeast Saccharomyces cerevisiae. Our results indicate that assembly of the hexameric ATPase ring is templated on the CP. We have also identified an apparent intermediate in base assembly, BP1, which contains Rpn1, three Rpts and Hsm3, a chaperone for base assembly. The Rpt proteins with the strongest assembly phenotypes, Rpt4 and Rpt6, were absent from BP1. We propose that Rpt4 and Rpt6 form a nucleating complex to initiate base assembly, and that this complex is subsequently joined by BP1 to complete the Rpt ring. Our studies show that assembly of the proteasome base is a rapid yet highly orchestrated process.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2722381/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2722381/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Park, Soyeon -- Roelofs, Jeroen -- Kim, Woong -- Robert, Jessica -- Schmidt, Marion -- Gygi, Steven P -- Finley, Daniel -- 5F32GM75737-2/GM/NIGMS NIH HHS/ -- F32 GM075737-01A2/GM/NIGMS NIH HHS/ -- GM043601/GM/NIGMS NIH HHS/ -- GM67945/GM/NIGMS NIH HHS/ -- R01 GM084228/GM/NIGMS NIH HHS/ -- England -- Nature. 2009 Jun 11;459(7248):866-70. doi: 10.1038/nature08065.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19412160" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases/*chemistry/genetics/*metabolism ; Molecular Chaperones/metabolism ; Proteasome Endopeptidase Complex/*biosynthesis/*chemistry/genetics/metabolism ; Saccharomyces cerevisiae/*enzymology/genetics ; Saccharomyces cerevisiae Proteins/chemistry/genetics/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
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    Enhancement of proteasome activity by a small-molecule inhibitor of USP14 (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-09-11
    Description: Proteasomes, the primary mediators of ubiquitin-protein conjugate degradation, are regulated through complex and poorly understood mechanisms. Here we show that USP14, a proteasome-associated deubiquitinating enzyme, can inhibit the degradation of ubiquitin-protein conjugates both in vitro and in cells. A catalytically inactive variant of USP14 has reduced inhibitory activity, indicating that inhibition is mediated by trimming of the ubiquitin chain on the substrate. A high-throughput screen identified a selective small-molecule inhibitor of the deubiquitinating activity of human USP14. Treatment of cultured cells with this compound enhanced degradation of several proteasome substrates that have been implicated in neurodegenerative disease. USP14 inhibition accelerated the degradation of oxidized proteins and enhanced resistance to oxidative stress. Enhancement of proteasome activity through inhibition of USP14 may offer a strategy to reduce the levels of aberrant proteins in cells under proteotoxic stress.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2939003/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2939003/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, Byung-Hoon -- Lee, Min Jae -- Park, Soyeon -- Oh, Dong-Chan -- Elsasser, Suzanne -- Chen, Ping-Chung -- Gartner, Carlos -- Dimova, Nevena -- Hanna, John -- Gygi, Steven P -- Wilson, Scott M -- King, Randall W -- Finley, Daniel -- DK082906/DK/NIDDK NIH HHS/ -- GM65592/GM/NIGMS NIH HHS/ -- GM66492/GM/NIGMS NIH HHS/ -- NS047533/NS/NINDS NIH HHS/ -- P30 NS057098/NS/NINDS NIH HHS/ -- P30 NS057098-049002/NS/NINDS NIH HHS/ -- R01 GM066492/GM/NIGMS NIH HHS/ -- R01 GM067945/GM/NIGMS NIH HHS/ -- R01 NS047533/NS/NINDS NIH HHS/ -- R01 NS047533-06A2/NS/NINDS NIH HHS/ -- England -- Nature. 2010 Sep 9;467(7312):179-84. doi: 10.1038/nature09299.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20829789" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cells, Cultured ; Humans ; Mice ; Proteasome Endopeptidase Complex/*metabolism ; Proteins/*metabolism ; Ubiquitin Thiolesterase/*antagonists & inhibitors ; Ubiquitination
    Print ISSN: 0028-0836
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 9
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    Varshavsky's contributions (2004)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2004-11-20
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Baumeister, Wolfgang -- Bachmair, Andreas -- Chau, Vincent -- Cohen, Robert -- Coffino, Phil -- Demartino, George -- Deshaies, Raymond -- Dohmen, Juergen -- Emr, Scott -- Finley, Daniel -- Hampton, Randy -- Hill, Christopher -- Hochstrasser, Mark -- Huber, Robert -- Jackson, Peter -- Jentsch, Stefan -- Johnson, Erica -- Kwon, Yong Tae -- Pagano, Michele -- Pickart, Cecile -- Rechsteiner, Martin -- Scheffner, Martin -- Sommer, Thomas -- Tansey, William -- Tyers, Mike -- Vierstra, Richard -- Weissman, Allan -- Wilkinson, Keith D -- Wolf, Dieter -- New York, N.Y. -- Science. 2004 Nov 19;306(5700):1290-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/15550643" target="_blank"〉PubMed〈/a〉
    Keywords: History, 20th Century ; History, 21st Century ; Nobel Prize ; Proteasome Endopeptidase Complex/*metabolism ; Proteins/metabolism ; Ubiquitin/*metabolism ; Ubiquitin-Protein Ligase Complexes/genetics/*metabolism ; United States
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Reconfiguration of the proteasome during chaperone-mediated assembly (2013)
    Nature Publishing Group (NPG)
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    Publication Date: 2013-05-07
    Description: The proteasomal ATPase ring, comprising Rpt1-Rpt6, associates with the heptameric alpha-ring of the proteasome core particle (CP) in the mature proteasome, with the Rpt carboxy-terminal tails inserting into pockets of the alpha-ring. Rpt ring assembly is mediated by four chaperones, each binding a distinct Rpt subunit. Here we report that the base subassembly of the Saccharomyces cerevisiae proteasome, which includes the Rpt ring, forms a high-affinity complex with the CP. This complex is subject to active dissociation by the chaperones Hsm3, Nas6 and Rpn14. Chaperone-mediated dissociation was abrogated by a non-hydrolysable ATP analogue, indicating that chaperone action is coupled to nucleotide hydrolysis by the Rpt ring. Unexpectedly, synthetic Rpt tail peptides bound alpha-pockets with poor specificity, except for Rpt6, which uniquely bound the alpha2/alpha3-pocket. Although the Rpt6 tail is not visualized within an alpha-pocket in mature proteasomes, it inserts into the alpha2/alpha3-pocket in the base-CP complex and is important for complex formation. Thus, the Rpt-CP interface is reconfigured when the lid complex joins the nascent proteasome to form the mature holoenzyme.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3687086/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3687086/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Park, Soyeon -- Li, Xueming -- Kim, Ho Min -- Singh, Chingakham Ranjit -- Tian, Geng -- Hoyt, Martin A -- Lovell, Scott -- Battaile, Kevin P -- Zolkiewski, Michal -- Coffino, Philip -- Roelofs, Jeroen -- Cheng, Yifan -- Finley, Daniel -- 1S10RR026814-01/RR/NCRR NIH HHS/ -- 5P20RR017708/RR/NCRR NIH HHS/ -- 8 P20 GM103420/GM/NIGMS NIH HHS/ -- P20 GM103418/GM/NIGMS NIH HHS/ -- P20 RR016475/RR/NCRR NIH HHS/ -- P20 RR017708/RR/NCRR NIH HHS/ -- R01 GM082893/GM/NIGMS NIH HHS/ -- R01GM045335/GM/NIGMS NIH HHS/ -- R01GM082893/GM/NIGMS NIH HHS/ -- R37GM043601/GM/NIGMS NIH HHS/ -- S10 RR026814/RR/NCRR NIH HHS/ -- England -- Nature. 2013 May 23;497(7450):512-6. doi: 10.1038/nature12123. Epub 2013 May 5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23644457" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases/chemistry/genetics/metabolism ; Adenosine Triphosphate/metabolism ; Binding Sites ; Carrier Proteins/metabolism ; Cryoelectron Microscopy ; Holoenzymes/chemistry/metabolism ; Models, Molecular ; Molecular Chaperones/*metabolism ; Proteasome Endopeptidase Complex/*chemistry/genetics/*metabolism ; Protein Conformation ; Recombinant Fusion Proteins/chemistry/genetics/metabolism ; Saccharomyces cerevisiae/enzymology/genetics/growth & development/*metabolism ; Saccharomyces cerevisiae Proteins/chemistry/genetics/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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