Structure, Composition, Physical Properties, and Turnover of Proliferated Peroxisomes
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Characterization of the Gene for the Microbody (Glycosomal) Triosephosphate Isomerase of Trypanosoma Brucei
The EMBO Journal vol.5 no.6 pp. 1291 -1298, 1986 Characterization of the gene for the microbody (glycosomal) triosephosphate isomerase of Trypanosoma brucei Bart W.Swinkels1, Wendy C.Gibson1, Klaas A.Osinga13, isomerase, EC 5.3.1.1) is particularly suitable for such com- Roel Kramer1, Gerrit H.Veeneman2, parative studies. The enzyme is well characterized (see Straus Jacques H.van Boom2 and Piet Borst1 et al., 1985); the amino acid sequence of TIMs from both 'Division of Molecular Biology, The Netherlands Cancer Institute, eukaryotic (Kolb et al., 1974; Corran and Waley, 1975; Alber Plesmanlaan 121, 1066 CX Amsterdam, and 20rganic Chemistry and Kawasaki, 1982; Maquat et al., 1985; Straus and Gilbert, Laboratory, State University Leiden, Gorlaeus Laboratory, PO Box 9502, 1985a) and prokaryotic (Artavanis-Tsakonas and Harris, 1980; 2300 RA Leiden, The Netherlands Pichersky et al., 1984) sources has been determined and high 3Present address: Research and Development, Gist-brocades NV, Postbus 1, resolution structures for the chicken (Banner et al., 1975) and 2600 MA Delft, The Netherlands yeast (Alber et al., 1981) proteins are available. This makes TIM Communicated by P.Borst suitable for deducing long-range evolutionary relationships. To determine how microbody enzymes enter microbodies, we TIM has previously been purified from Trypanosoma brucei are studying the genes for glycosomal (microbody) enzymes (Misset and Opperdoes, 1984) and crystals for X-ray diffraction in Trypanosoma brucei. Here we present our results for triose- have been obtained (Weirenga et al., 1984), allowing the elucida- phosphate isomerase (TIM), which is found exclusively in the tion of the 3-D structure of the enzyme. -
PEX5 Regulates Autophagy Via the Mtorc1-TFEB Axis During Starvation
Eun et al. Experimental & Molecular Medicine (2018) 50:4 DOI 10.1038/s12276-017-0007-8 Experimental & Molecular Medicine ARTICLE Open Access PEX5 regulates autophagy via the mTORC1-TFEB axis during starvation So Young Eun1,JoonNoLee2,In-KooNam2, Zhi-qiang Liu1,Hong-SeobSo 1, Seong-Kyu Choe1 and RaeKil Park2 Abstract Defects in the PEX5 gene impair the import of peroxisomal matrix proteins, leading to nonfunctional peroxisomes and other associated pathological defects such as Zellweger syndrome. Although PEX5 regulates autophagy process in a stress condition, the mechanisms controlling autophagy by PEX5 under nutrient deprivation are largely unknown. Herein, we show a novel function of PEX5 in the regulation of autophagy via Transcription Factor EB (TFEB). Under serum-starved conditions, when PEX5 is depleted, the mammalian target of rapamycin (mTORC1) inhibitor TSC2 is downregulated, which results in increased phosphorylation of the mTORC1 substrates, including 70S6K, S6K, and 4E- BP-1. mTORC1 activation further suppresses the nuclear localization of TFEB, as indicated by decreased mRNA levels of TFEB, LIPA, and LAMP1. Interestingly, peroxisomal mRNA and protein levels are also reduced by TFEB inactivation, indicating that TFEB might control peroxisome biogenesis at a transcriptional level. Conversely, pharmacological inhibition of mTOR resulting from PEX5 depletion during nutrient starvation activates TFEB by promoting nuclear localization of the protein. In addition, mTORC1 inhibition recovers the damaged-peroxisome biogenesis. These data suggest that PEX5 may be a critical regulator of lysosomal gene expression and autophagy through the mTOR-TFEB- autophagy axis under nutrient deprivation. 1234567890():,; 1234567890():,; Introduction Mitochondrial antiviral-signaling protein (MAVS) func- Peroxisome is an essential cellular organelle for per- tions as an antiviral signaling platform to induce the forming various metabolic activities, including oxidation interferon-independent signaling pathways4. -
The Association of Peroxisomes with the Developing Cell Plate in Dividing Onion Root Cells Depends on Actin Microfilaments and Myosin
Planta (2003) 218: 204–216 DOI 10.1007/s00425-003-1096-2 ORIGINAL ARTICLE David A. Collings Æ John D. I. Harper Æ Kevin C. Vaughn The association of peroxisomes with the developing cell plate in dividing onion root cells depends on actin microfilaments and myosin Received: 5 April 2003 / Accepted: 23 June 2003 / Published online: 21 August 2003 Ó Springer-Verlag 2003 Abstract We have investigated changes in the distribu- cling of excess membranes from secretory vesicles via the tion of peroxisomes through the cell cycle in onion b-oxidation pathway. Differences in aggregation, a (Allium cepa L.) root meristem cells with immunofluo- phenomenon which occurs in onion, some other mono- rescence and electron microscopy, and in leek (Allium cots and to a lesser extent in tobacco BY-2 suspension porrum L.) epidermal cells with immunofluorescence and cells, but which is not obvious in the roots of Arabidopsis peroxisomal-targeted green fluorescent protein. During thaliana (L.) Heynh., may reflect differences within the interphase and mitosis, peroxisomes distribute randomly primary cell walls of these plants. throughout the cytoplasm, but beginning late in ana- phase, they accumulate at the division plane. Initially, Keywords Actin microfilaments Æ Allium Æ peroxisomes occur within the microtubule phragmoplast Microtubule Æ Cell plate Æ Peroxisome Æ Phragmoplast in two zones on either side of the developing cell plate. However, as the phragmoplast expands outwards to Abbreviations BDM: 2,3-butanedione monoxime Æ DAPI: form an annulus, peroxisomes redistribute into a ring 4¢,6-diamidino-2-phenylindole Æ ER: endoplasmic reti- immediately inside the location of the microtubules. -
Cell & Molecular Biology
BSC ZO- 102 B. Sc. I YEAR CELL & MOLECULAR BIOLOGY DEPARTMENT OF ZOOLOGY SCHOOL OF SCIENCES UTTARAKHAND OPEN UNIVERSITY BSCZO-102 Cell and Molecular Biology DEPARTMENT OF ZOOLOGY SCHOOL OF SCIENCES UTTARAKHAND OPEN UNIVERSITY Phone No. 05946-261122, 261123 Toll free No. 18001804025 Fax No. 05946-264232, E. mail [email protected] htpp://uou.ac.in Board of Studies and Programme Coordinator Board of Studies Prof. B.D.Joshi Prof. H.C.S.Bisht Retd.Prof. Department of Zoology Department of Zoology DSB Campus, Kumaun University, Gurukul Kangri, University Nainital Haridwar Prof. H.C.Tiwari Dr.N.N.Pandey Retd. Prof. & Principal Senior Scientist, Department of Zoology, Directorate of Coldwater Fisheries MB Govt.PG College (ICAR) Haldwani Nainital. Bhimtal (Nainital). Dr. Shyam S.Kunjwal Department of Zoology School of Sciences, Uttarakhand Open University Programme Coordinator Dr. Shyam S.Kunjwal Department of Zoology School of Sciences, Uttarakhand Open University Haldwani, Nainital Unit writing and Editing Editor Writer Dr.(Ms) Meenu Vats Dr.Mamtesh Kumari , Professor & Head Associate. Professor Department of Zoology, Department of Zoology DAV College,Sector-10 Govt. PG College Chandigarh-160011 Uttarkashi (Uttarakhand) Dr.Sunil Bhandari Asstt. Professor. Department of Zoology BGR Campus Pauri, HNB (Central University) Garhwal. Course Title and Code : Cell and Molecular Biology (BSCZO 102) ISBN : 978-93-85740-54-1 Copyright : Uttarakhand Open University Edition : 2017 Published By : Uttarakhand Open University, Haldwani, Nainital- 263139 Contents Course 1: Cell and Molecular Biology Course code: BSCZO102 Credit: 3 Unit Block and Unit title Page number Number Block 1 Cell Biology or Cytology 1-128 1 Cell Type : History and origin. -
Hif-2A Promotes Degradation of Mammalian Peroxisomes by Selective Autophagy
Cell Metabolism Article Hif-2a Promotes Degradation of Mammalian Peroxisomes by Selective Autophagy Katharina M. Walter,1,2,10 Miriam J. Scho¨ nenberger,1,2,10 Martin Tro¨ tzmu¨ ller,3 Michael Horn,1 Hans-Peter Elsa¨ sser,4 Ann B. Moser,5 Miriam S. Lucas,6 Tobias Schwarz,6 Philipp A. Gerber,7 Phyllis L. Faust,8 Holger Moch,9 Harald C. Ko¨ feler,3 Wilhelm Krek,1,2,* and Werner J. Kovacs1,2,* 1Institute of Molecular Health Sciences 2Competence Center for Systems Physiology and Metabolic Diseases ETH Zurich, CH-8093 Zurich, Switzerland 3Core Facility for Mass Spectrometry, Center for Medical Research, Medical University of Graz, A-8010 Graz, Austria 4Department of Cytobiology, Philipps-University Marburg, D-35037 Marburg, Germany 5Kennedy Krieger Institute, Baltimore, MD 21205, USA 6ScopeM – Scientific Center for Optical and Electron Microscopy, ETH Zurich, CH-8093 Zurich, Switzerland 7Division of Endocrinology and Diabetes, University Hospital Zurich, CH-8091 Zurich, Switzerland 8Department of Pathology and Cell Biology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA 9Institute of Surgical Pathology, University Hospital Zurich, CH-8091 Zurich, Switzerland 10Co-first Authors *Correspondence: [email protected] (W.K.), [email protected] (W.J.K.) http://dx.doi.org/10.1016/j.cmet.2014.09.017 SUMMARY expressed HIF-1b subunit and O2-regulated a subunits (HIF-1a and HIF-2a)(Keith et al., 2012). Under normoxia, HIF-a subunits Peroxisomes play a central role in lipid metabolism, are hydroxylated and targeted for proteasomal degradation by and their function depends on molecular oxygen. -
Autophagy Stimulus-Dependent Role of the Small Gtpase Ras2 in Peroxisome Degradation
biomolecules Communication Autophagy Stimulus-Dependent Role of the Small GTPase Ras2 in Peroxisome Degradation Fahd Boutouja 1,2 and Harald W. Platta 1,* 1 Biochemie Intrazellulärer Transportprozesse, Ruhr-Universität Bochum, 44801 Bochum, Germany; [email protected] 2 Institute of Pathobiochemistry, Johannes Gutenberg-University Mainz, 55099 Mainz, Germany * Correspondence: [email protected]; Tel.: +49-234-322-4968 Received: 17 October 2020; Accepted: 12 November 2020; Published: 14 November 2020 Abstract: The changing accessibility of nutrient resources induces the reprogramming of cellular metabolism in order to adapt the cell to the altered growth conditions. The nutrient-depending signaling depends on the kinases mTOR (mechanistic target of rapamycin), which is mainly activated by nitrogen-resources, and PKA (protein kinase A), which is mainly activated by glucose, as well as both of their associated factors. These systems promote protein synthesis and cell proliferation, while they inhibit degradation of cellular content by unselective bulk autophagy. Much less is known about their role in selective autophagy pathways, which have a more regulated cellular function. Especially, we were interested to analyse the central Ras2-module of the PKA-pathway in the context of peroxisome degradation. Yeast Ras2 is homologous to the mammalian Ras proteins, whose mutant forms are responsible for 33% of human cancers. In the present study, we were able to demonstrate a context-dependent role of Ras2 activity depending on the type of mTOR-inhibition and glucose-sensing situation. When mTOR was inhibited directly via the macrolide rapamycin, peroxisome degradation was still partially suppressed by Ras2, while inactivation of Ras2 resulted in an enhanced degradation of peroxisomes, suggesting a role of Ras2 in the inhibition of peroxisome degradation in glucose-grown cells. -
The Membrane Remodeling Protein Pex11p Activates the Gtpase Dnm1p During Peroxisomal Fission
The membrane remodeling protein Pex11p activates the GTPase Dnm1p during peroxisomal fission Chris Williamsa, Lukasz Opalinskia,b,1, Christiane Landgrafc, Joseph Costellod, Michael Schraderd, Arjen M. Krikkena,b, Kèvin Knoopsa, Anita M. Krama,b, Rudolf Volkmerc,e, and Ida J. van der Kleia,b,2 aMolecular Cell Biology, Groningen Biomolecular Sciences and Biotechnology Institute, and bKluyver Centre for Genomics of Industrial Fermentation, University of Groningen, 9747 AG Groningen, The Netherlands; cInstitut für Medizinische Immunologie, Charité-Universitätsmedizin Berlin, 10115 Berlin, Germany; dCollege of Life and Environmental Sciences, Biosciences, University of Exeter, Exeter EX4 4QD, United Kingdom; and eLeibniz-Institut für Molekulare Pharmakologie, 13125 Berlin, Germany Edited by Jennifer Lippincott-Schwartz, National Institutes of Health, Bethesda, MD, and approved April 14, 2015 (received for review October 9, 2014) The initial phase of peroxisomal fission requires the peroxisomal Fis1p and (in S. cerevisiae) the accessory proteins Mdv1p and membrane protein Peroxin 11 (Pex11p), which remodels the mem- Caf4p (12). Interestingly these proteins are also responsible for brane, resulting in organelle elongation. Here, we identify an ad- mitochondrial fission in yeast (13). ditional function for Pex11p, demonstrating that Pex11p also plays Dnm1p (Drp1 in mammals) (11, 14) is a large GTPase that a crucial role in the final step of peroxisomal fission: dynamin-like achieves membrane fission by forming oligomeric, ring-like struc- protein (DLP)-mediated membrane scission. First, we demonstrate tures around constricted sites on organelle membranes (15). Powered that yeast Pex11p is necessary for the function of the GTPase by GTP hydrolysis, these ring-like structures then tighten further Dynamin-related 1 (Dnm1p) in vivo. -
Biol 1020: a Tour of the Cell
Chapter 6: A Tour of the Cell Cell theory Cell organization and homeostasis Studying cells – microscopy and fractionation Eukaryotic vs. prokaryotic cells Compartments in eukaryotic cells (cell regions, organelles) Cytoskeleton Outside the cell . Chapter 6: A Tour of the Cell Cell theory Cell organization and homeostasis Studying cells – microscopy and fractionation Eukaryotic vs. prokaryotic cells Compartments in eukaryotic cells (cell regions, organelles) Cytoskeleton Outside the cell . • What are the main tenets of cell theory? • What are the major lines of evidence that all presently living cells have a common origin? . Cell theory All living organisms are composed of cells smallest “building blocks” of all multicellular organisms all cells are enclosed by a surface membrane that separates them from other cells and from their environment specialized structures with the cell are called organelles; many are membrane-bound . Cell theory Today, all new cells arise from existing cells All presently living cells have a common origin all cells have basic structural and molecular similarities all cells share similar energy conversion reactions all cells maintain and transfer genetic information in DNA the genetic code is essentially universal . • What are the main tenets of cell theory? • What are the major lines of evidence that all presently living cells have a common origin? . Chapter 6: A Tour of the Cell Cell theory Cell organization and homeostasis Studying cells – microscopy and fractionation Eukaryotic vs. prokaryotic cells Compartments in eukaryotic cells (cell regions, organelles) Cytoskeleton Outside the cell . • What is surface area to volume ratio, and why is it an important consideration for cells? • What (usually) happens to surface area to volume ratio as cells grow larger? . -
Uncovering Targeting Priority to Yeast Peroxisomes Using an In-Cell Competition Assay
Uncovering targeting priority to yeast peroxisomes using an in-cell competition assay Mira Rosenthala,1, Eyal Metzl-Raza,1, Jérôme Bürgib, Eden Yifracha, Layla Drweshc, Amir Fadela, Yoav Pelegd, Doron Rapaportc, Matthias Wilmannsb,e, Naama Barkaia, Maya Schuldinera,2, and Einat Zalckvara,2 aDepartment of Molecular Genetics, Weizmann Institute of Science, 7610001 Rehovot, Israel; bHamburg Unit c/o DESY, European Molecular Biology Laboratory, 22607 Hamburg, Germany; cInterfaculty Institute of Biochemistry, University of Tübingen, 72074 Tübingen, Germany; dStructural Proteomics Unit, Department of Life Sciences Core Facilities, Weizmann Institute of Science, 7610001 Rehovot, Israel; and eUniversity Medical Center Hamburg-Eppendorf, 20246 Hamburg, Germany Edited by William A. Prinz, National Institutes of Health, Bethesda, MD, and accepted by Editorial Board Member Tony Hunter July 17, 2020 (received for review November 16, 2019) Approximately half of eukaryotic proteins reside in organelles. To any pathway what all of the proteins that have evolved to be reach their correct destination, such proteins harbor targeting signals optimally targeted by it are, what the various mechanisms by recognized by dedicated targeting pathways. It has been shown that which they do so are, and how this is rewired under the changing differences in targeting signals alter the efficiency in which proteins metabolic conditions of the cell. are recognized and targeted. Since multiple proteins compete for any To study targeting priority for entire pathways and in living single pathway, such differences can affect the priority for which a cells, we developed a systematic tool that is based on high content protein is catered. However, to date the entire repertoire of proteins imaging in the yeast Saccharomyces cerevisiae (hereafter called with targeting priority, and the mechanisms underlying it, have not yeast). -
Pkd1 Mutation Has No Apparent Effects on Peroxisome Structure Or Lipid Metabolism
Kidney360 Publish Ahead of Print, published on July 16, 2021 as doi:10.34067/KID.0000962021 Pkd1 mutation has no apparent effects on peroxisome structure or lipid metabolism Takeshi Terabayashi1, Luis F Menezes1, Fang Zhou1, Hongyi Cai2, Peter J Walter2, Hugo M Garraffo2, Gregory G Germino1 1. Kidney Disease Branch; National Institutes of Diabetes and Digestive and Kidney Disease, NIDDK, National Institutes of Health, Bethesda, MD, United States 2. Clinical Mass Spectrometry Core; National Institutes of Diabetes and Digestive and Kidney Disease, National Institutes of Health, Bethesda, MD, United States Correspondence: Gregory G Germino Kidney Disease Branch; National Institutes of Diabetes and Digestive and Kidney Disease, NIDDK, National Institutes of Health Bethesda, Maryland 20892 United States [email protected] 1 Copyright 2021 by American Society of Nephrology. Key Points: While fatty acid oxidation defects have been reported in PKD, no studies have examined whether peroxisomes contribute to the abnormalities. We investigated peroxisome biogenesis and FA metabolism in ADPKD models and tested whether polycystin-1 co-localized with peroxisome proteins. Our studies show that loss of Pkd1 does not disrupt peroxisome biogenesis nor peroxisome-dependent FA metabolism. Abstract: Background: Multiple studies of tissue and cell samples from patients and pre-clinical models of autosomal dominant polycystic kidney disease report abnormal mitochondrial function and morphology and suggest metabolic reprogramming is an intrinsic feature of this disease. Peroxisomes interact with mitochondria physically and functionally, and congenital peroxisome biogenesis disorders can cause various phenotypes, including mitochondrial defects, metabolic abnormalities and renal cysts. We hypothesized that a peroxisomal defect might contribute to the metabolic and mitochondrial impairments observed in autosomal dominant polycystic kidney disease. -
Mechanisms and Functions of Pexophagy in Mammalian Cells
cells Review Mechanisms and Functions of Pexophagy in Mammalian Cells Jing Li 1 and Wei Wang 2,* 1 Department of Integrated Traditional Chinese and Western Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China; [email protected] 2 Department of Human Anatomy, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China * Correspondence: [email protected] Abstract: Peroxisomes play essential roles in diverse cellular metabolism functions, and their dy- namic homeostasis is maintained through the coordination of peroxisome biogenesis and turnover. Pexophagy, selective autophagic degradation of peroxisomes, is a major mechanism for removing damaged and/or superfluous peroxisomes. Dysregulation of pexophagy impairs the physiological functions of peroxisomes and contributes to the progression of many human diseases. However, the mechanisms and functions of pexophagy in mammalian cells remain largely unknown com- pared to those in yeast. This review focuses on mammalian pexophagy and aims to advance the understanding of the roles of pexophagy in human health and diseases. Increasing evidence shows that ubiquitination can serve as a signal for pexophagy, and ubiquitin-binding receptors, substrates, and E3 ligases/deubiquitinases involved in pexophagy have been described. Alternatively, pex- ophagy can be achieved in a ubiquitin-independent manner. We discuss the mechanisms of these ubiquitin-dependent and ubiquitin-independent pexophagy pathways and summarize several in- ducible conditions currently used to study pexophagy. We highlight several roles of pexophagy in human health and how its dysregulation may contribute to diseases. Citation: Li, J.; Wang, W. Keywords: peroxisome; autophagy; mammalian; pexophagy; ubiquitin; receptor Mechanisms and Functions of Pexophagy in Mammalian Cells. -
Peroxisome Diversity and Evolution
Downloaded from rstb.royalsocietypublishing.org on January 3, 2011 Peroxisome diversity and evolution Toni Gabaldón Phil. Trans. R. Soc. B 2010 365, 765-773 doi: 10.1098/rstb.2009.0240 References This article cites 63 articles, 20 of which can be accessed free http://rstb.royalsocietypublishing.org/content/365/1541/765.full.html#ref-list-1 Rapid response Respond to this article http://rstb.royalsocietypublishing.org/letters/submit/royptb;365/1541/765 Subject collections Articles on similar topics can be found in the following collections cellular biology (98 articles) evolution (2302 articles) Receive free email alerts when new articles cite this article - sign up in the box at the top Email alerting service right-hand corner of the article or click here To subscribe to Phil. Trans. R. Soc. B go to: http://rstb.royalsocietypublishing.org/subscriptions This journal is © 2010 The Royal Society Downloaded from rstb.royalsocietypublishing.org on January 3, 2011 Phil. Trans. R. Soc. B (2010) 365, 765–773 doi:10.1098/rstb.2009.0240 Review Peroxisome diversity and evolution Toni Gabaldo´n* Centre for Genomic Regulation (CRG), Dr Aiguader, 88 08003 Barcelona, Spain Peroxisomes are organelles bounded by a single membrane that can be found in all major groups of eukaryotes. A single evolutionary origin of this cellular compartment is supported by the presence, in diverse organisms, of a common set of proteins implicated in peroxisome biogenesis and maintenance. Their enzymatic content, however, can vary substantially across species, indicating a high level of evol- utionary plasticity. Proteomic analyses have greatly expanded our knowledge on peroxisomes in some model organisms, including plants, mammals and yeasts.