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  • 1
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    A transmembrane form of the prion protein in neurodegenerative disease (1998)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1998-02-28
    Description: At the endoplasmic reticulum membrane, the prion protein (PrP) can be synthesized in several topological forms. The role of these different forms was explored with transgenic mice expressing PrP mutations that alter the relative ratios of the topological forms. Expression of a particular transmembrane form (termed CtmPrP) produced neurodegenerative changes in mice similar to those of some genetic prion diseases. Brains from these mice contained CtmPrP but not PrPSc, the PrP isoform responsible for transmission of prion diseases. Furthermore, in one heritable prion disease of humans, brain tissue contained CtmPrP but not PrPSc. Thus, aberrant regulation of protein biogenesis and topology at the endoplasmic reticulum can result in neurodegeneration.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hegde, R S -- Mastrianni, J A -- Scott, M R -- DeFea, K A -- Tremblay, P -- Torchia, M -- DeArmond, S J -- Prusiner, S B -- Lingappa, V R -- AG02132/AG/NIA NIH HHS/ -- New York, N.Y. -- Science. 1998 Feb 6;279(5352):827-34.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of California, San Francisco, CA 94143-0444, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9452375" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Brain/metabolism/pathology ; Cricetinae ; Endopeptidases/metabolism ; Endoplasmic Reticulum/chemistry/*metabolism ; Gerstmann-Straussler-Scheinker Disease/metabolism ; Humans ; Intracellular Membranes/chemistry ; Mesocricetus ; Mice ; Mice, Transgenic ; Molecular Sequence Data ; Mutation ; Neurodegenerative Diseases/*etiology/metabolism/pathology ; PrPC Proteins/biosynthesis/*chemistry/genetics/*metabolism ; PrPSc Proteins/chemistry/metabolism ; Prion Diseases/etiology/metabolism/pathology ; Prions/biosynthesis/*chemistry/genetics/*metabolism ; Protein Conformation
    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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  • 2
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    Allergenicity resulting from functional mimicry of a Toll-like receptor complex protein (2008)
    Nature Publishing Group (NPG)
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    Publication Date: 2008-12-09
    Description: Aeroallergy results from maladaptive immune responses to ubiquitous, otherwise innocuous environmental proteins. Although the proteins targeted by aeroallergic responses represent a tiny fraction of the airborne proteins humans are exposed to, allergenicity is a quite public phenomenon-the same proteins typically behave as aeroallergens across the human population. Why particular proteins tend to act as allergens in susceptible hosts is a fundamental mechanistic question that remains largely unanswered. The main house-dust-mite allergen, Der p 2, has structural homology with MD-2 (also known as LY96), the lipopolysaccharide (LPS)-binding component of the Toll-like receptor (TLR) 4 signalling complex. Here we show that Der p 2 also has functional homology, facilitating signalling through direct interactions with the TLR4 complex, and reconstituting LPS-driven TLR4 signalling in the absence of MD-2. Mirroring this, airway sensitization and challenge with Der p 2 led to experimental allergic asthma in wild type and MD-2-deficient, but not TLR4-deficient, mice. Our results indicate that Der p 2 tends to be targeted by adaptive immune responses because of its auto-adjuvant properties. The fact that other members of the MD-2-like lipid-binding family are allergens, and that most defined major allergens are thought to be lipid-binding proteins, suggests that intrinsic adjuvant activity by such proteins and their accompanying lipid cargo may have some generality as a mechanism underlying the phenomenon of allergenicity.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2843411/" 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/PMC2843411/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Trompette, Aurelien -- Divanovic, Senad -- Visintin, Alberto -- Blanchard, Carine -- Hegde, Rashmi S -- Madan, Rajat -- Thorne, Peter S -- Wills-Karp, Marsha -- Gioannini, Theresa L -- Weiss, Jerry P -- Karp, Christopher L -- R01 AI075159/AI/NIAID NIH HHS/ -- R01 AI075159-01/AI/NIAID NIH HHS/ -- R01 EY014648/EY/NEI NIH HHS/ -- R01 HL067736/HL/NHLBI NIH HHS/ -- R01 HL067736-05/HL/NHLBI NIH HHS/ -- England -- Nature. 2009 Jan 29;457(7229):585-8. doi: 10.1038/nature07548. Epub 2008 Dec 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Molecular Immunology, Cincinnati Children's Hospital Medical Center and the University of Cincinnati College of Medicine, Cincinnati, Ohio 45229, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19060881" target="_blank"〉PubMed〈/a〉
    Keywords: Air ; Allergens/chemistry/genetics/*immunology/*metabolism ; Animals ; Antigens, Dermatophagoides/chemistry/genetics/*immunology/*metabolism ; Arthropod Proteins ; Asthma/genetics/immunology ; Cell Line ; Disease Models, Animal ; Female ; Humans ; Lipopolysaccharides/immunology ; Lymphocyte Antigen 96/chemistry/deficiency/genetics/immunology/metabolism ; Mice ; Molecular Mimicry/*immunology ; Protein Binding ; Toll-Like Receptor 4/deficiency/genetics/*immunology/*metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 3
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    The structural basis of tail-anchored membrane protein recognition by Get3 (2009)
    Nature Publishing Group (NPG)
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    Publication Date: 2009-08-14
    Description: Targeting of newly synthesized membrane proteins to the endoplasmic reticulum is an essential cellular process. Most membrane proteins are recognized and targeted co-translationally by the signal recognition particle. However, nearly 5% of membrane proteins are 'tail-anchored' by a single carboxy-terminal transmembrane domain that cannot access the co-translational pathway. Instead, tail-anchored proteins are targeted post-translationally by a conserved ATPase termed Get3. The mechanistic basis for tail-anchored protein recognition or targeting by Get3 is not known. Here we present crystal structures of yeast Get3 in 'open' (nucleotide-free) and 'closed' (ADP.AlF(4)(-)-bound) dimer states. In the closed state, the dimer interface of Get3 contains an enormous hydrophobic groove implicated by mutational analyses in tail-anchored protein binding. In the open state, Get3 undergoes a striking rearrangement that disrupts the groove and shields its hydrophobic surfaces. These data provide a molecular mechanism for nucleotide-regulated binding and release of tail-anchored proteins during their membrane targeting by Get3.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mateja, Agnieszka -- Szlachcic, Anna -- Downing, Maureen E -- Dobosz, Malgorzata -- Mariappan, Malaiyalam -- Hegde, Ramanujan S -- Keenan, Robert J -- MC_UP_A022_1007/Medical Research Council/United Kingdom -- Intramural NIH HHS/ -- England -- Nature. 2009 Sep 17;461(7262):361-6. doi: 10.1038/nature08319. Epub 2009 Aug 12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry & Molecular Biology, The University of Chicago, Gordon Center for Integrative Science, Room W238, 929 East 57th Street, Chicago, Illinois 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/19675567" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Diphosphate/metabolism ; Adenosine Triphosphatases/*chemistry/*metabolism ; Adenosine Triphosphate/metabolism ; Aluminum Compounds/chemistry/metabolism ; Crystallography, X-Ray ; Fluorides/chemistry/metabolism ; Guanine Nucleotide Exchange Factors/*chemistry/*metabolism ; Hydrophobic and Hydrophilic Interactions ; Membrane Proteins/chemistry/*metabolism ; Methanococcus ; Models, Molecular ; Protein Binding ; Protein Conformation ; Protein Multimerization ; Saccharomyces cerevisiae/*chemistry ; Saccharomyces cerevisiae Proteins/*chemistry/*metabolism ; Structure-Activity Relationship
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 4
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    A ribosome-associating factor chaperones tail-anchored membrane proteins (2010)
    Nature Publishing Group (NPG)
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    Publication Date: 2010-08-03
    Description: Hundreds of proteins are inserted post-translationally into the endoplasmic reticulum (ER) membrane by a single carboxy-terminal transmembrane domain (TMD). During targeting through the cytosol, the hydrophobic TMD of these tail-anchored (TA) proteins requires constant chaperoning to prevent aggregation or inappropriate interactions. A central component of this targeting system is TRC40, a conserved cytosolic factor that recognizes the TMD of TA proteins and delivers them to the ER for insertion. The mechanism that permits TRC40 to find and capture its TA protein cargos effectively in a highly crowded cytosol is unknown. Here we identify a conserved three-protein complex composed of Bat3, TRC35 and Ubl4A that facilitates TA protein capture by TRC40. This Bat3 complex is recruited to ribosomes synthesizing membrane proteins, interacts with the TMDs of newly released TA proteins, and transfers them to TRC40 for targeting. Depletion of the Bat3 complex allows non-TRC40 factors to compete for TA proteins, explaining their mislocalization in the analogous yeast deletion strains. Thus, the Bat3 complex acts as a TMD-selective chaperone that effectively channels TA proteins to the TRC40 insertion pathway.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2928861/" 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/PMC2928861/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mariappan, Malaiyalam -- Li, Xingzhe -- Stefanovic, Sandra -- Sharma, Ajay -- Mateja, Agnieszka -- Keenan, Robert J -- Hegde, Ramanujan S -- MC_UP_A022_1007/Medical Research Council/United Kingdom -- ZIA HD008862-02/Intramural NIH HHS/ -- England -- Nature. 2010 Aug 26;466(7310):1120-4. doi: 10.1038/nature09296. Epub 2010 Aug 1.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cell Biology and Metabolism Program, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/20676083" target="_blank"〉PubMed〈/a〉
    Keywords: Carrier Proteins/metabolism ; Endoplasmic Reticulum/metabolism ; Humans ; Membrane Proteins/*metabolism ; Molecular Chaperones/*metabolism ; Protein Transport ; Ribosomes/*metabolism ; Signal Recognition Particle/metabolism ; Ubiquitins/metabolism
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 5
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    A direct and melanopsin-dependent fetal light response regulates mouse eye development (2013)
    Nature Publishing Group (NPG)
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    Publication Date: 2013-01-22
    Description: Vascular patterning is critical for organ function. In the eye, there is simultaneous regression of embryonic hyaloid vasculature (important to clear the optical path) and formation of the retinal vasculature (important for the high metabolic demands of retinal neurons). These events occur postnatally in the mouse. Here we have identified a light-response pathway that regulates both processes. We show that when mice are mutated in the gene (Opn4) for the atypical opsin melanopsin, or are dark-reared from late gestation, the hyaloid vessels are persistent at 8 days post-partum and the retinal vasculature overgrows. We provide evidence that these vascular anomalies are explained by a light-response pathway that suppresses retinal neuron number, limits hypoxia and, as a consequence, holds local expression of vascular endothelial growth factor (VEGFA) in check. We also show that the light response for this pathway occurs in late gestation at about embryonic day 16 and requires the photopigment in the fetus and not the mother. Measurements show that visceral cavity photon flux is probably sufficient to activate melanopsin-expressing retinal ganglion cells in the mouse fetus. These data thus show that light--the stimulus for function of the mature eye--is also critical in preparing the eye for vision by regulating retinal neuron number and initiating a series of events that ultimately pattern the ocular blood vessels.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3746810/" 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/PMC3746810/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rao, Sujata -- Chun, Christina -- Fan, Jieqing -- Kofron, J Matthew -- Yang, Michael B -- Hegde, Rashmi S -- Ferrara, Napoleone -- Copenhagen, David R -- Lang, Richard A -- AR-47363/AR/NIAMS NIH HHS/ -- R01 EY001869/EY/NEI NIH HHS/ -- R01 EY014648/EY/NEI NIH HHS/ -- R01 EY021636/EY/NEI NIH HHS/ -- R01 EY022917/EY/NEI NIH HHS/ -- R01 EY023179/EY/NEI NIH HHS/ -- England -- Nature. 2013 Feb 14;494(7436):243-6. doi: 10.1038/nature11823. Epub 2013 Jan 16.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Visual Systems Group, Abrahamson Pediatric Eye Institute, Division of Pediatric Ophthalmology, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio 45229, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23334418" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Count ; Cell Hypoxia/radiation effects ; Eye/*blood supply/*growth & development/metabolism/radiation effects ; Female ; Fetus/cytology/embryology/metabolism/*radiation effects ; *Light ; Light Signal Transduction/*radiation effects ; Mice ; Mice, Inbred C57BL ; Neovascularization, Pathologic ; Neovascularization, Physiologic/radiation effects ; Photons ; Retinal Ganglion Cells/cytology/metabolism/radiation effects ; Retinal Neurons/cytology/metabolism/*radiation effects ; Rod Opsins/deficiency/genetics/*metabolism ; Vascular Endothelial Growth Factor A/metabolism
    Print ISSN: 0028-0836
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 6
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    The mechanism of membrane-associated steps in tail-anchored protein insertion (2011)
    Nature Publishing Group (NPG)
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    Publication Date: 2011-08-26
    Description: Tail-anchored (TA) membrane proteins destined for the endoplasmic reticulum are chaperoned by cytosolic targeting factors that deliver them to a membrane receptor for insertion. Although a basic framework for TA protein recognition is now emerging, the decisive targeting and membrane insertion steps are not understood. Here we reconstitute the TA protein insertion cycle with purified components, present crystal structures of key complexes between these components and perform mutational analyses based on the structures. We show that a committed targeting complex, formed by a TA protein bound to the chaperone ATPase Get3, is initially recruited to the membrane through an interaction with Get2. Once the targeting complex has been recruited, Get1 interacts with Get3 to drive TA protein release in an ATPase-dependent reaction. After releasing its TA protein cargo, the now-vacant Get3 recycles back to the cytosol concomitant with ATP binding. This work provides a detailed structural and mechanistic framework for the minimal TA protein insertion cycle.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3760497/" 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/PMC3760497/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mariappan, Malaiyalam -- Mateja, Agnieszka -- Dobosz, Malgorzata -- Bove, Elia -- Hegde, Ramanujan S -- Keenan, Robert J -- MC_UP_A022_1007/Medical Research Council/United Kingdom -- R01 GM086487/GM/NIGMS NIH HHS/ -- R01GM086487/GM/NIGMS NIH HHS/ -- Intramural NIH HHS/ -- England -- Nature. 2011 Aug 24;477(7362):61-6. doi: 10.1038/nature10362.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cell Biology and Metabolism Program, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21866104" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Endoplasmic Reticulum/metabolism ; Membrane Proteins/chemistry/*metabolism ; Models, Molecular ; Protein Transport ; Saccharomyces cerevisiae/metabolism/*physiology ; Saccharomyces cerevisiae Proteins/chemistry/*metabolism
    Print ISSN: 0028-0836
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 7
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    Protein targeting and degradation are coupled for elimination of mislocalized proteins (2011)
    Nature Publishing Group (NPG)
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    Publication Date: 2011-07-12
    Description: A substantial proportion of the genome encodes membrane proteins that are delivered to the endoplasmic reticulum by dedicated targeting pathways. Membrane proteins that fail targeting must be rapidly degraded to avoid aggregation and disruption of cytosolic protein homeostasis. The mechanisms of mislocalized protein (MLP) degradation are unknown. Here we reconstitute MLP degradation in vitro to identify factors involved in this pathway. We find that nascent membrane proteins tethered to ribosomes are not substrates for ubiquitination unless they are released into the cytosol. Their inappropriate release results in capture by the Bag6 complex, a recently identified ribosome-associating chaperone. Bag6-complex-mediated capture depends on the presence of unprocessed or non-inserted hydrophobic domains that distinguish MLPs from potential cytosolic proteins. A subset of these Bag6 complex 'clients' are transferred to TRC40 for insertion into the membrane, whereas the remainder are rapidly ubiquitinated. Depletion of the Bag6 complex selectively impairs the efficient ubiquitination of MLPs. Thus, by its presence on ribosomes that are synthesizing nascent membrane proteins, the Bag6 complex links targeting and ubiquitination pathways. We propose that such coupling allows the fast tracking of MLPs for degradation without futile engagement of the cytosolic folding machinery.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3150218/" 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/PMC3150218/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hessa, Tara -- Sharma, Ajay -- Mariappan, Malaiyalam -- Eshleman, Heather D -- Gutierrez, Erik -- Hegde, Ramanujan S -- MC_UP_A022_1007/Medical Research Council/United Kingdom -- ZIA HD008861-02/Intramural NIH HHS/ -- England -- Nature. 2011 Jul 10;475(7356):394-7. doi: 10.1038/nature10181.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cell Biology and Metabolism Program, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21743475" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arsenite Transporting ATPases/metabolism ; Cattle ; Cell Membrane/metabolism ; Cytoplasm/metabolism ; Endoplasmic Reticulum/metabolism ; Humans ; Hydrophobic and Hydrophilic Interactions ; Molecular Chaperones/metabolism ; Multiprotein Complexes/metabolism ; Neuropeptide Y/chemistry ; Prions/chemistry/*metabolism ; Prolactin/chemistry ; Proteasome Endopeptidase Complex/metabolism ; Protein Folding ; Protein Precursors/chemistry ; Protein Sorting Signals/physiology ; Protein Structure, Tertiary ; Protein Transport ; Ribosomes/metabolism ; Ubiquitin/metabolism ; *Ubiquitination
    Print ISSN: 0028-0836
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    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
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    Cell Biology. Local synthesis and disposal (2014)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2014-11-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shao, Sichen -- Hegde, Ramanujan S -- MC_UP_A022_1007/Medical Research Council/United Kingdom -- New York, N.Y. -- Science. 2014 Nov 7;346(6210):701-2. doi: 10.1126/science.1261602.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MRC Laboratory of Molecular Biology, Cambridge, CB2 0QH, UK. ; MRC Laboratory of Molecular Biology, Cambridge, CB2 0QH, UK. rhegde@mrc-lmb.cam.ac.uk.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25378608" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cells/*metabolism ; Endoplasmic Reticulum/*metabolism ; *Endoplasmic Reticulum-Associated Degradation ; Humans ; Membrane Proteins/*metabolism ; Mitochondria/*metabolism ; Mitochondrial Proteins/*metabolism ; Multiprotein Complexes/*metabolism ; Nuclear Envelope/*metabolism ; *Peptide Chain Initiation, Translational ; *Protein Biosynthesis ; Ribosomes/*metabolism ; Saccharomyces cerevisiae/*metabolism ; Saccharomyces cerevisiae Proteins/*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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  • 9
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    Protein targeting. Structure of the Get3 targeting factor in complex with its membrane protein cargo (2015)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2015-03-07
    Description: Tail-anchored (TA) proteins are a physiologically important class of membrane proteins targeted to the endoplasmic reticulum by the conserved guided-entry of TA proteins (GET) pathway. During transit, their hydrophobic transmembrane domains (TMDs) are chaperoned by the cytosolic targeting factor Get3, but the molecular nature of the functional Get3-TA protein targeting complex remains unknown. We reconstituted the physiologic assembly pathway for a functional targeting complex and showed that it comprises a TA protein bound to a Get3 homodimer. Crystal structures of Get3 bound to different TA proteins showed an alpha-helical TMD occupying a hydrophobic groove that spans the Get3 homodimer. Our data elucidate the mechanism of TA protein recognition and shielding by Get3 and suggest general principles of hydrophobic domain chaperoning by cellular targeting factors.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4413028/" 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/PMC4413028/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mateja, Agnieszka -- Paduch, Marcin -- Chang, Hsin-Yang -- Szydlowska, Anna -- Kossiakoff, Anthony A -- Hegde, Ramanujan S -- Keenan, Robert J -- MC_UP_A022_1007/Medical Research Council/United Kingdom -- P41 GM103403/GM/NIGMS NIH HHS/ -- R01 GM086487/GM/NIGMS NIH HHS/ -- U01 GM094588/GM/NIGMS NIH HHS/ -- U54 GM087519/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2015 Mar 6;347(6226):1152-5. doi: 10.1126/science.1261671.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57th Street, Chicago, IL 60637, USA. ; MRC Laboratory of Molecular Biology, Francis Crick Avenue, Cambridge CB2 0QH, UK. rhegde@mrc-lmb.cam.ac.uk bkeenan@uchicago.edu. ; Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57th Street, Chicago, IL 60637, USA. rhegde@mrc-lmb.cam.ac.uk bkeenan@uchicago.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/25745174" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphatases/*chemistry/metabolism ; Crystallography, X-Ray ; Cytosol/enzymology ; Guanine Nucleotide Exchange Factors/*chemistry/metabolism ; Hydrophobic and Hydrophilic Interactions ; Membrane Proteins/*chemistry/metabolism ; Molecular Chaperones/chemistry/metabolism ; Multiprotein Complexes/chemistry/metabolism ; Protein Multimerization ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Protein Transport ; Saccharomyces cerevisiae Proteins/*chemistry/metabolism
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  • 10
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    Structure of the Sec61 channel opened by a signal sequence (2016)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 2016-01-02
    Description: Secreted and integral membrane proteins compose up to one-third of the biological proteome. These proteins contain hydrophobic signals that direct their translocation across or insertion into the lipid bilayer by the Sec61 protein-conducting channel. The molecular basis of how hydrophobic signals within a nascent polypeptide trigger channel opening is not understood. Here, we used cryo-electron microscopy to determine the structure of an active Sec61 channel that has been opened by a signal sequence. The signal supplants helix 2 of Sec61alpha, which triggers a rotation that opens the central pore both axially across the membrane and laterally toward the lipid bilayer. Comparisons with structures of Sec61 in other states suggest a pathway for how hydrophobic signals engage the channel to gain access to the lipid bilayer.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4700591/" 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/PMC4700591/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Voorhees, Rebecca M -- Hegde, Ramanujan S -- MC_UP_A022_1007/Medical Research Council/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2016 Jan 1;351(6268):88-91. doi: 10.1126/science.aad4992.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉MRC Laboratory of Molecular Biology, Medical Research Council, Francis Crick Avenue, Cambridge CB2 0QH, UK. ; MRC Laboratory of Molecular Biology, Medical Research Council, Francis Crick Avenue, Cambridge CB2 0QH, UK. rhegde@mrc-lmb.cam.ac.uk.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26721998" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cryoelectron Microscopy ; Crystallography, X-Ray ; Dogs ; Hydrophobic and Hydrophilic Interactions ; Lipid Bilayers/chemistry ; Membrane Proteins/*chemistry ; Protein Sorting Signals ; Protein Structure, Secondary ; Ribosomes/chemistry
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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