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Singh AK, Chaube B, Citrin KM, Fowler JW, Lee S, Catarino J, Knight J, Lowery S, Shree S, Boutagy N, Ruz-Maldonado I, Harry K, Shanabrough M, Ross TT, Malaker S, Suárez Y, Fernández-Hernando C, Grabinska K, Sessa WC. Loss of cis-PTase function in the liver promotes a highly penetrant form of fatty liver disease that rapidly transitions to hepatocellular carcinoma. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.11.13.566870. [PMID: 38014178 PMCID: PMC10680637 DOI: 10.1101/2023.11.13.566870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2023]
Abstract
Obesity-linked fatty liver is a significant risk factor for hepatocellular carcinoma (HCC) 1,2 ; however, the molecular mechanisms underlying the transition from non-alcoholic fatty liver disease (NAFLD) to HCC remains unclear. The present study explores the role of the endoplasmic reticulum (ER)-associated protein NgBR, an essential component of the cis-prenyltransferases (cis-PTase) enzyme 3 , in chronic liver disease. Here we show that genetic depletion of NgBR in hepatocytes of mice (N-LKO) intensifies triacylglycerol (TAG) accumulation, inflammatory responses, ER/oxidative stress, and liver fibrosis, ultimately resulting in HCC development with 100% penetrance after four months on a high-fat diet. Comprehensive genomic and single cell transcriptomic atlas from affected livers provides a detailed molecular analysis of the transition from liver pathophysiology to HCC development. Importantly, pharmacological inhibition of diacylglycerol acyltransferase-2 (DGAT2), a key enzyme in hepatic TAG synthesis, abrogates diet-induced liver damage and HCC burden in N-LKO mice. Overall, our findings establish NgBR/cis-PTase as a critical suppressor of NAFLD-HCC conversion and suggests that DGAT2 inhibition may serve as a promising therapeutic approach to delay HCC formation in patients with advanced non-alcoholic steatohepatitis (NASH).
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2
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Nguyen MN, Chakraborty D, Rao SR, Onysk A, Radkiewicz M, Surmacz L, Swiezewska E, Soubeyrand E, Akhtar TA, Kraft TW, Sherry DM, Fliesler SJ, Pittler SJ. A Dhdds K42E knock-in RP59 mouse model shows inner retina pathology and defective synaptic transmission. Cell Death Dis 2023; 14:420. [PMID: 37443173 PMCID: PMC10345138 DOI: 10.1038/s41419-023-05936-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2022] [Revised: 06/07/2023] [Accepted: 06/29/2023] [Indexed: 07/15/2023]
Abstract
Retinitis pigmentosa (RP) defines a group of hereditary progressive rod-cone degenerations that exhibit a common phenotype caused by variants in over 70 genes. While most variants in the dehydrodolichyl diphosphate synthase (DHDDS) gene result in syndromic abnormalities, some variants cause non-syndromic RP (RP59). DHDDS encodes one subunit of the enzyme cis-prenyltransferase (CPT), which is required for the synthesis of dolichol (Dol), that is a necessary protein glycosylation cofactor. We previously reported the creation and initial characterization of a knock-in (KI) mouse model harboring the most prevalent RP59-associated DHDDS variant (K42E) to understand how defects in DHDDS lead to retina-specific pathology. This model exhibited no profound retinal degeneration, nor protein N-glycosylation defects. Here, we report that the Dol isoprenylogue species in retina, liver, and brain of the K42E mouse model are statistically shorter than in the corresponding tissues of age-matched controls, as reported in blood and urine of RP59 patients. Retinal transcriptome analysis demonstrated elevation of many genes encoding proteins involved in synaptogenesis and synaptic function. Quantitative retinal cell layer thickness measurements demonstrated a significant reduction in the inner nuclear layer (INL) and total retinal thickness (TRT) beginning at postnatal (PN) ∼2 months, progressively increasing to PN 18-mo. Histological analysis revealed cell loss in the INL, outer plexiform layer (OPL) disruption, and ectopic localization of outer nuclear layer (ONL) nuclei into the OPL of K42E mutant retinas, relative to controls. Electroretinograms (ERGs) of mutant mice exhibited reduced b-wave amplitudes beginning at PN 1-mo, progressively declining through PN 18-mo, without appreciable a-wave attenuation, relative to controls. Our results suggest that the underlying cause of DHDDS K42E variant driven RP59 retinal pathology is defective synaptic transmission from outer to inner retina.
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Affiliation(s)
- Mai N Nguyen
- Department of Optometry and Vision Science, Vision Science Research Center, School of Optometry, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Dibyendu Chakraborty
- Department of Optometry and Vision Science, Vision Science Research Center, School of Optometry, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Sriganesh Ramachandra Rao
- Research Service, VA Western New York Healthcare System, Buffalo, NY, 14215, USA
- Departments of Ophthalmology and Biochemistry and Neuroscience Graduate Program, Jacobs School of Medicine and Biomedical Sciences, The State University of New York, University at Buffalo, Buffalo, NY, 14203, USA
| | - Agnieszka Onysk
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, 02106, Poland
| | - Mariusz Radkiewicz
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, 02106, Poland
| | - Liliana Surmacz
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, 02106, Poland
| | - Ewa Swiezewska
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, 02106, Poland
| | - Eric Soubeyrand
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, N1G2W1, Canada
| | - Tariq A Akhtar
- Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, N1G2W1, Canada
| | - Timothy W Kraft
- Department of Optometry and Vision Science, Vision Science Research Center, School of Optometry, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - David M Sherry
- Departments of Cell Biology, Neurosurgery, and Pharmaceutical Sciences, University of Oklahoma Health Sciences Center, Oklahoma City, OK, 73104, USA
| | - Steven J Fliesler
- Research Service, VA Western New York Healthcare System, Buffalo, NY, 14215, USA
- Departments of Ophthalmology and Biochemistry and Neuroscience Graduate Program, Jacobs School of Medicine and Biomedical Sciences, The State University of New York, University at Buffalo, Buffalo, NY, 14203, USA
| | - Steven J Pittler
- Department of Optometry and Vision Science, Vision Science Research Center, School of Optometry, University of Alabama at Birmingham, Birmingham, AL, 35294, USA.
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3
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Rao SR, Pittler SJ, Fliesler SJ. Perspectives on Retinal Dolichol Metabolism, and Visual Deficits in Dolichol Metabolism-Associated Inherited Disorders. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2023; 1415:449-456. [PMID: 37440071 DOI: 10.1007/978-3-031-27681-1_66] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
De novo synthesis of dolichol (Dol) and dolichyl phosphate (Dol-P) is essential for protein glycosylation. Herein, we provide a brief overview of Dol and Dol-P synthesis and the maintenance of their cellular content. Retinal Dol metabolism and the requirement of Dol-linked oligosaccharide synthesis in the neural retina also are discussed. There are recently discovered and an emerging class of rare congenital disorders that affect Dol metabolism, involving the genes DHDDS, NUS1, SRD5A3, and DOLK. Further understanding of these congenital disorders is evolving, based upon studies utilizing yeast and murine models, as well as clinical reports of these rare disorders. We summarize the known visual deficits associated with Dol metabolism disorders, and identify the need for generation and characterization of suitable animal models of these disorders to elucidate the underlying molecular and cellular mechanisms of the associated retinopathies.
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Affiliation(s)
- Sriganesh Ramachandra Rao
- Departments of Ophthalmology and Biochemistry, and Neuroscience Graduate Program, Jacobs School of Medicine and Biomedical Sciences, State University of New York, Buffalo, NY, USA
- Research Service, VA Western NY Healthcare System, Buffalo, NY, USA
| | - Steven J Pittler
- Department of Optometry and Vision Science, Vision Science Research Center, School of Optometry, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Steven J Fliesler
- Departments of Ophthalmology and Biochemistry, and Neuroscience Graduate Program, Jacobs School of Medicine and Biomedical Sciences, State University of New York, Buffalo, NY, USA.
- Research Service, VA Western NY Healthcare System, Buffalo, NY, USA.
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4
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Fliesler SJ, Ramachandra Rao S, Nguyen MN, KhalafAllah MT, Pittler SJ. Vertebrate Animal Models of RP59: Current Status and Future Prospects. Int J Mol Sci 2022; 23:13324. [PMID: 36362109 PMCID: PMC9657489 DOI: 10.3390/ijms232113324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2022] [Revised: 10/27/2022] [Accepted: 10/28/2022] [Indexed: 09/20/2023] Open
Abstract
Retinitis pigmentosa-59 (RP59) is a rare, recessive form of RP, caused by mutations in the gene encoding DHDDS (dehydrodolichyl diphosphate synthase). DHDDS forms a heterotetrameric complex with Nogo-B receptor (NgBR; gene NUS1) to form a cis-prenyltransferase (CPT) enzyme complex, which is required for the synthesis of dolichol, which in turn is required for protein N-glycosylation as well as other glycosylation reactions in eukaryotic cells. Herein, we review the published phenotypic characteristics of RP59 models extant, with an emphasis on their ocular phenotypes, based primarily upon knock-in of known RP59-associated DHDDS mutations as well as cell type- and tissue-specific knockout of DHDDS alleles in mice. We also briefly review findings in RP59 patients with retinal disease and other patients with DHDDS mutations causing epilepsy and other neurologic disease. We discuss these findings in the context of addressing "knowledge gaps" in our current understanding of the underlying pathobiology mechanism of RP59, as well as their potential utility for developing therapeutic interventions to block the onset or to dampen the severity or progression of RP59.
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Affiliation(s)
- Steven J. Fliesler
- Departments of Ophthalmology and Biochemistry, Neuroscience Graduate Program, Jacobs School of Medicine, State University of New York—University at Buffalo, Buffalo, NY 14203, USA
- Research Service, VA Western NY Healthcare System, Buffalo, NY 14215, USA
| | - Sriganesh Ramachandra Rao
- Departments of Ophthalmology and Biochemistry, Neuroscience Graduate Program, Jacobs School of Medicine, State University of New York—University at Buffalo, Buffalo, NY 14203, USA
- Research Service, VA Western NY Healthcare System, Buffalo, NY 14215, USA
| | - Mai N. Nguyen
- Department of Optometry and Vision Science, Vision Science Research Center, School of Optometry, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Mahmoud Tawfik KhalafAllah
- Department of Optometry and Vision Science, Vision Science Research Center, School of Optometry, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Steven J. Pittler
- Department of Optometry and Vision Science, Vision Science Research Center, School of Optometry, University of Alabama at Birmingham, Birmingham, AL 35294, USA
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5
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Giladi M, Lisnyansky Bar-El M, Vaňková P, Ferofontov A, Melvin E, Alkaderi S, Kavan D, Redko B, Haimov E, Wiener R, Man P, Haitin Y. Structural basis for long-chain isoprenoid synthesis by cis-prenyltransferases. SCIENCE ADVANCES 2022; 8:eabn1171. [PMID: 35584224 PMCID: PMC9116609 DOI: 10.1126/sciadv.abn1171] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/05/2021] [Accepted: 04/01/2022] [Indexed: 06/15/2023]
Abstract
Isoprenoids are synthesized by the prenyltransferase superfamily, which is subdivided according to the product stereoisomerism and length. In short- and medium-chain isoprenoids, product length correlates with active site volume. However, enzymes synthesizing long-chain products and rubber synthases fail to conform to this paradigm, because of an unexpectedly small active site. Here, we focused on the human cis-prenyltransferase complex (hcis-PT), residing at the endoplasmic reticulum membrane and playing a crucial role in protein glycosylation. Crystallographic investigation of hcis-PT along the reaction cycle revealed an outlet for the elongating product. Hydrogen-deuterium exchange mass spectrometry analysis showed that the hydrophobic active site core is flanked by dynamic regions consistent with separate inlet and outlet orifices. Last, using a fluorescence substrate analog, we show that product elongation and membrane association are closely correlated. Together, our results support direct membrane insertion of the elongating isoprenoid during catalysis, uncoupling active site volume from product length.
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Affiliation(s)
- Moshe Giladi
- Department of Physiology and Pharmacology, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv 6997801, Israel
- Tel Aviv Sourasky Medical Center, Tel Aviv 6423906, Israel
| | - Michal Lisnyansky Bar-El
- Department of Physiology and Pharmacology, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv 6997801, Israel
| | - Pavla Vaňková
- Institute of Microbiology of the Czech Academy of Sciences, Division BioCeV, Prumyslova 595, 252 50 Vestec, Czech Republic
| | - Alisa Ferofontov
- Department of Physiology and Pharmacology, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv 6997801, Israel
| | - Emelia Melvin
- Department of Physiology and Pharmacology, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv 6997801, Israel
| | - Suha Alkaderi
- Department of Physiology and Pharmacology, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv 6997801, Israel
| | - Daniel Kavan
- Institute of Microbiology of the Czech Academy of Sciences, Division BioCeV, Prumyslova 595, 252 50 Vestec, Czech Republic
| | - Boris Redko
- Blavatnik Center for Drug Discovery, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Elvira Haimov
- Blavatnik Center for Drug Discovery, Tel Aviv University, Tel Aviv 6997801, Israel
| | - Reuven Wiener
- Department of Biochemistry and Molecular Biology, IMRIC, Hadassah Medical School, The Hebrew University, Jerusalem 9112001, Israel
| | - Petr Man
- Institute of Microbiology of the Czech Academy of Sciences, Division BioCeV, Prumyslova 595, 252 50 Vestec, Czech Republic
| | - Yoni Haitin
- Department of Physiology and Pharmacology, Sackler School of Medicine, Tel-Aviv University, Tel-Aviv 6997801, Israel
- Sagol School of Neuroscience, Tel Aviv University, Tel Aviv 6997801, Israel
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6
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Galosi S, Edani BH, Martinelli S, Hansikova H, Eklund EA, Caputi C, Masuelli L, Corsten-Janssen N, Srour M, Oegema R, Bosch DGM, Ellis CA, Amlie-Wolf L, Accogli A, Atallah I, Averdunk L, Barañano KW, Bei R, Bagnasco I, Brusco A, Demarest S, Alaix AS, Di Bonaventura C, Distelmaier F, Elmslie F, Gan-Or Z, Good JM, Gripp K, Kamsteeg EJ, Macnamara E, Marcelis C, Mercier N, Peeden J, Pizzi S, Pannone L, Shinawi M, Toro C, Verbeek NE, Venkateswaran S, Wheeler PG, Zdrazilova L, Zhang R, Zorzi G, Guerrini R, Sessa WC, Lefeber DJ, Tartaglia M, Hamdan FF, Grabińska KA, Leuzzi V. De novo DHDDS variants cause a neurodevelopmental and neurodegenerative disorder with myoclonus. Brain 2022; 145:208-223. [PMID: 34382076 PMCID: PMC8967098 DOI: 10.1093/brain/awab299] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 07/03/2021] [Accepted: 07/16/2021] [Indexed: 11/12/2022] Open
Abstract
Subcellular membrane systems are highly enriched in dolichol, whose role in organelle homeostasis and endosomal-lysosomal pathway remains largely unclear besides being involved in protein glycosylation. DHDDS encodes for the catalytic subunit (DHDDS) of the enzyme cis-prenyltransferase (cis-PTase), involved in dolichol biosynthesis and dolichol-dependent protein glycosylation in the endoplasmic reticulum. An autosomal recessive form of retinitis pigmentosa (retinitis pigmentosa 59) has been associated with a recurrent DHDDS variant. Moreover, two recurring de novo substitutions were detected in a few cases presenting with neurodevelopmental disorder, epilepsy and movement disorder. We evaluated a large cohort of patients (n = 25) with de novo pathogenic variants in DHDDS and provided the first systematic description of the clinical features and long-term outcome of this new neurodevelopmental and neurodegenerative disorder. The functional impact of the identified variants was explored by yeast complementation system and enzymatic assay. Patients presented during infancy or childhood with a variable association of neurodevelopmental disorder, generalized epilepsy, action myoclonus/cortical tremor and ataxia. Later in the disease course, they experienced a slow neurological decline with the emergence of hyperkinetic and/or hypokinetic movement disorder, cognitive deterioration and psychiatric disturbances. Storage of lipidic material and altered lysosomes were detected in myelinated fibres and fibroblasts, suggesting a dysfunction of the lysosomal enzymatic scavenger machinery. Serum glycoprotein hypoglycosylation was not detected and, in contrast to retinitis pigmentosa and other congenital disorders of glycosylation involving dolichol metabolism, the urinary dolichol D18/D19 ratio was normal. Mapping the disease-causing variants into the protein structure revealed that most of them clustered around the active site of the DHDDS subunit. Functional studies using yeast complementation assay and in vitro activity measurements confirmed that these changes affected the catalytic activity of the cis-PTase and showed growth defect in yeast complementation system as compared with the wild-type enzyme and retinitis pigmentosa-associated protein. In conclusion, we characterized a distinctive neurodegenerative disorder due to de novo DHDDS variants, which clinically belongs to the spectrum of genetic progressive encephalopathies with myoclonus. Clinical and biochemical data from this cohort depicted a condition at the intersection of congenital disorders of glycosylation and inherited storage diseases with several features akin to of progressive myoclonus epilepsy such as neuronal ceroid lipofuscinosis and other lysosomal disorders.
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Affiliation(s)
- Serena Galosi
- Department of Human Neuroscience, Sapienza University, Rome 00185, Italy
| | - Ban H Edani
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520, USA.,Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Simone Martinelli
- Department of Oncology and Molecular Medicine, Istituto Superiore di Sanità, Rome 00161, Italy
| | - Hana Hansikova
- Department of Pediatrics and Inherited Metabolic Disorders, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague 12808, Czech Republic
| | - Erik A Eklund
- Section for Pediatrics, Department of Clinical Sciences, Lund University, Lund 22184, Sweden
| | - Caterina Caputi
- Department of Human Neuroscience, Sapienza University, Rome 00185, Italy
| | - Laura Masuelli
- Department of Experimental Medicine, Sapienza University, Rome 00161, Italy
| | - Nicole Corsten-Janssen
- Department of Genetics, University of Groningen, University Medical Center Groningen, Groningen 9700, The Netherlands
| | - Myriam Srour
- Department of Pediatrics, McGill University, Montreal, QC H4A 3J1, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, QC H4A 3J1, Canada
| | - Renske Oegema
- Department of Genetics, University Medical Center Utrecht, Utrecht 3584 CX, The Netherlands
| | - Daniëlle G M Bosch
- Department of Genetics, University Medical Center Utrecht, Utrecht 3584 CX, The Netherlands
| | - Colin A Ellis
- Department of Neurology, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Louise Amlie-Wolf
- Division of Medical Genetics, Nemours/A I duPont Hospital for Children, Wilmington, DE 19803, USA
| | - Andrea Accogli
- Department of Pediatrics, McGill University, Montreal, QC H4A 3J1, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, QC H4A 3J1, Canada
| | - Isis Atallah
- Division of Genetic Medicine, Lausanne University Hospital and University of Lausanne, Lausanne 1011, Switzerland
| | - Luisa Averdunk
- Department of General Pediatrics, Neonatology and Pediatric Cardiology, Medical Faculty and University Hospital Düsseldorf, Heinrich-Heine-University Düsseldorf 40225, Germany
| | - Kristin W Barañano
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore, MD 21287, USA
| | - Roberto Bei
- Department of Clinical Sciences and Translational Medicine, University of Rome 'Tor Vergata', Rome 00133, Italy
| | - Irene Bagnasco
- Division of Neuropsychiatry, Epilepsy Center for Children, Martini Hospital, Turin 10128, Italy
| | - Alfredo Brusco
- Department of Medical Sciences, University of Torino & Medical Genetics Unit, Città della Salute e della Scienza University Hospital, Turin 10126, Italy
| | - Scott Demarest
- Children's Hospital Colorado, Aurora, CO 80045, USA.,Department of Pediatrics, University of Colorado School of Medicine, Aurora, CO 80045, USA
| | - Anne-Sophie Alaix
- Hopital Universitaire Necker Enfants Malades APHP, Paris 75015, France
| | | | - Felix Distelmaier
- Department of General Pediatrics, Neonatology and Pediatric Cardiology, Medical Faculty and University Hospital Düsseldorf, Heinrich-Heine-University Düsseldorf 40225, Germany
| | - Frances Elmslie
- South West Thames Regional Genetics Service, St. George's Healthcare NHS Trust, London SW17 0QT, UK
| | - Ziv Gan-Or
- Department of Neurology and Neurosurgery, McGill University, Montreal, QC H4A 3J1, Canada.,Montréal Neurological Institute and Hospital, McGill University, Montreal, QC H3A 2B4, Canada.,Department of Human Genetics, McGill University, Montréal, QC H3A 0C7, Canada
| | - Jean-Marc Good
- Division of Genetic Medicine, Lausanne University Hospital and University of Lausanne, Lausanne 1011, Switzerland
| | - Karen Gripp
- Division of Medical Genetics, Nemours/A I duPont Hospital for Children, Wilmington, DE 19803, USA
| | - Erik-Jan Kamsteeg
- Department of Human Genetics, Radboud University Medical Centre, Nijmegen 6525, The Netherlands
| | - Ellen Macnamara
- Undiagnosed Diseases Program, National Institutes of Health, Bethesda, MD 20892-2152, USA
| | - Carlo Marcelis
- Department of Clinical Genetics, Radboud University Medical Centre, Nijmegen 6525, The Netherlands
| | - Noëlle Mercier
- Service d'Epileptologie et Médecine du handicap, Hôpital Neurologique, Institution de Lavigny, Lavigny 1175, Switzerland
| | - Joseph Peeden
- East Tennessee Children's Hospital, University of Tennessee Department of Medicine, Knoxville, TN 37916, USA
| | - Simone Pizzi
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, IRCCS, Rome 00146, Italy
| | - Luca Pannone
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, IRCCS, Rome 00146, Italy
| | - Marwan Shinawi
- Department of Pediatrics, Washington University School of Medicine, St. Louis, MO 63110, USA
| | - Camilo Toro
- Undiagnosed Diseases Program, National Institutes of Health, Bethesda, MD 20892-2152, USA
| | - Nienke E Verbeek
- Department of Genetics, University Medical Center Utrecht, Utrecht 3584 CX, The Netherlands
| | - Sunita Venkateswaran
- Division of Neurology, Children's Hospital of Eastern Ontario, Ottawa ON K1H 8L1, Canada
| | | | - Lucie Zdrazilova
- Department of Pediatrics and Inherited Metabolic Disorders, First Faculty of Medicine, Charles University in Prague and General University Hospital in Prague, Prague 12808, Czech Republic
| | - Rong Zhang
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520, USA.,Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Giovanna Zorzi
- Department of Pediatric Neurology, IRCCS Foundation Carlo Besta Neurological Institute, Milan 20133, Italy
| | - Renzo Guerrini
- AOU Meyer, Pediatric Neurology, Neurogenetics and Neurobiology Unit and Laboratories, Meyer Children's Hospital, University of Florence, Florence 50139, Italy
| | - William C Sessa
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520, USA.,Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Dirk J Lefeber
- Department of Neurology, Translational Metabolic Laboratory, Donders Institute for Brain, Cognition and Behavior, Radboud University Medical Centre, Nijmegen 6525 AJ, The Netherlands
| | - Marco Tartaglia
- Genetics and Rare Diseases Research Division, Ospedale Pediatrico Bambino Gesù, IRCCS, Rome 00146, Italy
| | - Fadi F Hamdan
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC H3T1C5, Canada
| | - Kariona A Grabińska
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520, USA.,Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520, USA
| | - Vincenzo Leuzzi
- Department of Human Neuroscience, Sapienza University, Rome 00185, Italy
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7
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Structural basis of heterotetrameric assembly and disease mutations in the human cis-prenyltransferase complex. Nat Commun 2020; 11:5273. [PMID: 33077723 PMCID: PMC7573591 DOI: 10.1038/s41467-020-18970-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Accepted: 09/23/2020] [Indexed: 11/17/2022] Open
Abstract
The human cis-prenyltransferase (hcis-PT) is an enzymatic complex essential for protein N-glycosylation. Synthesizing the precursor of the glycosyl carrier dolichol-phosphate, mutations in hcis-PT cause severe human diseases. Here, we reveal that hcis-PT exhibits a heterotetrameric assembly in solution, consisting of two catalytic dehydrodolichyl diphosphate synthase (DHDDS) and inactive Nogo-B receptor (NgBR) heterodimers. Importantly, the 2.3 Å crystal structure reveals that the tetramer assembles via the DHDDS C-termini as a dimer-of-heterodimers. Moreover, the distal C-terminus of NgBR transverses across the interface with DHDDS, directly participating in active-site formation and the functional coupling between the subunits. Finally, we explored the functional consequences of disease mutations clustered around the active-site, and in combination with molecular dynamics simulations, we propose a mechanism for hcis-PT dysfunction in retinitis pigmentosa. Together, our structure of the hcis-PT complex unveils the dolichol synthesis mechanism and its perturbation in disease. The human cis-prenyltransferase (hcis-PT) complex synthesizes the precursor of the glycosyl carrier dolichol-phosphate and as such it is essential for protein N-glycosylation. The crystal structure of the complex reveals unusual tetrameric architecture and provides insights into dolichol synthesis mechanism and functional consequences of disease-associated hcis-PT mutations.
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8
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Edani BH, Grabińska KA, Zhang R, Park EJ, Siciliano B, Surmacz L, Ha Y, Sessa WC. Structural elucidation of the cis-prenyltransferase NgBR/DHDDS complex reveals insights in regulation of protein glycosylation. Proc Natl Acad Sci U S A 2020; 117:20794-20802. [PMID: 32817466 PMCID: PMC7456142 DOI: 10.1073/pnas.2008381117] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
Abstract
Cis-prenyltransferase (cis-PTase) catalyzes the rate-limiting step in the synthesis of glycosyl carrier lipids required for protein glycosylation in the lumen of endoplasmic reticulum. Here, we report the crystal structure of the human NgBR/DHDDS complex, which represents an atomic resolution structure for any heterodimeric cis-PTase. The crystal structure sheds light on how NgBR stabilizes DHDDS through dimerization, participates in the enzyme's active site through its C-terminal -RXG- motif, and how phospholipids markedly stimulate cis-PTase activity. Comparison of NgBR/DHDDS with homodimeric cis-PTase structures leads to a model where the elongating isoprene chain extends beyond the enzyme's active site tunnel, and an insert within the α3 helix helps to stabilize this energetically unfavorable state to enable long-chain synthesis to occur. These data provide unique insights into how heterodimeric cis-PTases have evolved from their ancestral, homodimeric forms to fulfill their function in long-chain polyprenol synthesis.
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Affiliation(s)
- Ban H Edani
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520
| | - Kariona A Grabińska
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520
| | - Rong Zhang
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520
| | - Eon Joo Park
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520
| | - Benjamin Siciliano
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520
| | - Liliana Surmacz
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, 02-106, Warsaw, Poland
| | - Ya Ha
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520;
| | - William C Sessa
- Vascular Biology and Therapeutics Program, Yale University School of Medicine, New Haven, CT 06520;
- Department of Pharmacology, Yale University School of Medicine, New Haven, CT 06520
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9
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A new role for dolichol isoform profile in the diagnostics of CDG disorders. Clin Chim Acta 2020; 507:88-93. [DOI: 10.1016/j.cca.2020.04.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Revised: 03/23/2020] [Accepted: 04/10/2020] [Indexed: 11/22/2022]
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10
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Ramachandra Rao S, Skelton LA, Wu F, Onysk A, Spolnik G, Danikiewicz W, Butler MC, Stacks DA, Surmacz L, Mu X, Swiezewska E, Pittler SJ, Fliesler SJ. Retinal Degeneration Caused by Rod-Specific Dhdds Ablation Occurs without Concomitant Inhibition of Protein N-Glycosylation. iScience 2020; 23:101198. [PMID: 32526701 PMCID: PMC7287266 DOI: 10.1016/j.isci.2020.101198] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 04/10/2020] [Accepted: 05/20/2020] [Indexed: 12/16/2022] Open
Abstract
Dehydrodolichyl diphosphate synthase (DHDDS) catalyzes the committed step in dolichol synthesis. Recessive mutations in DHDDS cause retinitis pigmentosa (RP59), resulting in blindness. We hypothesized that rod photoreceptor-specific ablation of Dhdds would cause retinal degeneration due to diminished dolichol-dependent protein N-glycosylation. Dhddsflx/flx mice were crossed with rod-specific Cre recombinase-expressing (Rho-iCre75) mice to generate rod-specific Dhdds knockout mice (Dhddsflx/flx iCre+). In vivo morphological and electrophysiological evaluation of Dhddsflx/flx iCre+ retinas revealed mild retinal dysfunction at postnatal (PN) 4 weeks, compared with age-matched controls; however, rapid photoreceptor degeneration ensued, resulting in almost complete loss of rods and cones by PN 6 weeks. Retina dolichol levels were markedly decreased by PN 4 weeks in Dhddsflx/flx iCre+ mice, relative to controls; despite this, N-glycosylation of retinal proteins, including opsin (the dominant rod-specific glycoprotein), persisted in Dhddsflx/flx iCre+ mice. These findings challenge the conventional mechanistic view of RP59 as a congenital disorder of glycosylation. Deletion of Dhdds in rod cells caused rapid retinal degeneration in mice Retinal dolichol levels markedly decreased before onset of degeneration Protein N-glycosylation was uncompromised despite Dhdds deletion Degeneration also involved gliosis, microglial activation, and phagoptosis
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Affiliation(s)
- Sriganesh Ramachandra Rao
- Department of Ophthalmology/Ross Eye Institute, Jacobs School of Medicine and Biomedical Sciences, State University of New York- University at Buffalo, Buffalo, NY 14209, USA; Research Service, VA Western NY Healthcare System, Buffalo, NY 142015, USA; Department of Biochemistry, Jacobs School of Medicine and Biomedical Sciences, State University of New York- University at Buffalo, Buffalo, NY 14203, USA
| | - Lara A Skelton
- Department of Ophthalmology/Ross Eye Institute, Jacobs School of Medicine and Biomedical Sciences, State University of New York- University at Buffalo, Buffalo, NY 14209, USA; Research Service, VA Western NY Healthcare System, Buffalo, NY 142015, USA; Department of Biochemistry, Jacobs School of Medicine and Biomedical Sciences, State University of New York- University at Buffalo, Buffalo, NY 14203, USA
| | - Fuguo Wu
- Department of Ophthalmology/Ross Eye Institute, Jacobs School of Medicine and Biomedical Sciences, State University of New York- University at Buffalo, Buffalo, NY 14209, USA; Department of Biochemistry, Jacobs School of Medicine and Biomedical Sciences, State University of New York- University at Buffalo, Buffalo, NY 14203, USA; New York State Center of Excellence in Bioinformatics and Life Sciences, State University of New York- University at Buffalo, Buffalo, NY 14203, USA
| | - Agnieszka Onysk
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Grzegorz Spolnik
- Institute of Organic Chemistry, Polish Academy of Sciences, Warsaw 02106, Poland
| | - Witold Danikiewicz
- Institute of Organic Chemistry, Polish Academy of Sciences, Warsaw 02106, Poland
| | - Mark C Butler
- Department of Ophthalmology/Ross Eye Institute, Jacobs School of Medicine and Biomedical Sciences, State University of New York- University at Buffalo, Buffalo, NY 14209, USA; Research Service, VA Western NY Healthcare System, Buffalo, NY 142015, USA
| | - Delores A Stacks
- Department of Optometry and Vision Science, Vision Science Research Center, School of Optometry, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Liliana Surmacz
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Xiuqian Mu
- Department of Ophthalmology/Ross Eye Institute, Jacobs School of Medicine and Biomedical Sciences, State University of New York- University at Buffalo, Buffalo, NY 14209, USA; Department of Biochemistry, Jacobs School of Medicine and Biomedical Sciences, State University of New York- University at Buffalo, Buffalo, NY 14203, USA; New York State Center of Excellence in Bioinformatics and Life Sciences, State University of New York- University at Buffalo, Buffalo, NY 14203, USA
| | - Ewa Swiezewska
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Warsaw, Poland
| | - Steven J Pittler
- Department of Optometry and Vision Science, Vision Science Research Center, School of Optometry, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Steven J Fliesler
- Department of Ophthalmology/Ross Eye Institute, Jacobs School of Medicine and Biomedical Sciences, State University of New York- University at Buffalo, Buffalo, NY 14209, USA; Research Service, VA Western NY Healthcare System, Buffalo, NY 142015, USA; Department of Biochemistry, Jacobs School of Medicine and Biomedical Sciences, State University of New York- University at Buffalo, Buffalo, NY 14203, USA.
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11
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Lack of Overt Retinal Degeneration in a K42E Dhdds Knock-In Mouse Model of RP59. Cells 2020; 9:cells9040896. [PMID: 32272552 PMCID: PMC7226774 DOI: 10.3390/cells9040896] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Revised: 03/30/2020] [Accepted: 04/04/2020] [Indexed: 12/17/2022] Open
Abstract
Dehydrodolichyl diphosphate synthase (DHDDS) is required for protein N-glycosylation in eukaryotic cells. A K42E point mutation in the DHDDS gene causes an autosomal recessive form of retinitis pigmentosa (RP59), which has been classified as a congenital disease of glycosylation (CDG). We generated K42E Dhdds knock-in mice as a potential model for RP59. Mice heterozygous for the Dhdds K42E mutation were generated using CRISPR/Cas9 technology and crossed to generate DhddsK42E/K42E homozygous mice. Spectral domain-optical coherence tomography (SD-OCT) was performed to assess retinal structure, relative to age-matched wild type (WT) controls. Immunohistochemistry against glial fibrillary acidic protein (GFAP) and opsin (1D4 epitope) was performed on retinal frozen sections to monitor gliosis and opsin localization, respectively, while lectin cytochemistry, plus and minus PNGase-F treatment, was performed to assess protein glycosylation status. Retinas of DhddsK42E/K42E mice exhibited grossly normal histological organization from 1 to 12 months of age. Anti-GFAP immunoreactivity was markedly increased in DhddsK42E/K42E mice, relative to controls. However, opsin immunolocalization, ConA labeling and PNGase-F sensitivity were comparable in mutant and control retinas. Hence, retinas of DhddsK42E/K42E mice exhibited no overt signs of degeneration, yet were markedly gliotic, but without evidence of compromised protein N-glycosylation. These results challenge the notion of RP59 as a DHDDS loss-of-function CDG and highlight the need to investigate unexplored RP59 disease mechanisms.
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12
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A2E Distribution in RPE Granules in Human Eyes. Molecules 2020; 25:molecules25061413. [PMID: 32244898 PMCID: PMC7144568 DOI: 10.3390/molecules25061413] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 03/11/2020] [Accepted: 03/17/2020] [Indexed: 12/30/2022] Open
Abstract
A2E (N-retinylidene-N-retinylethanolamine) is a major fluorophore in the RPE (retinal pigment epithelium). To identify and characterize A2E-rich RPE lipofuscin, we fractionated RPE granules from human donor eyes into five fractions (F1–F5 in ascending order of density) by discontinuous sucrose density gradient centrifugation. The dry weight of each fraction was measured and A2E was quantified by liquid chromatography/mass spectrometry (LC/MS) using a synthetic A2E homolog as a standard. Autofluorescence emission was characterized by a customer-built spectro-fluorometer system. A significant A2E level was detected in every fraction, and the highest level was found in F1, a low-density fraction that makes up half of the total weight of all RPE granules, contains 67% of all A2E, and emits 75% of projected autofluorescence by all RPE granules. This group of RPE granules, not described previously, is therefore the most abundant RPE lipofuscin granule population. A progressive decrease in autofluorescence was observed from F2 to F4, whereas no autofluorescence emission was detected from the heavily pigmented F5. The identification of a novel and major RPE lipofuscin population could have significant implications in our understanding of A2E and lipofuscin in human RPE.
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13
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Nafar Z, Wen R, Guan Z, Li Y, Jiao S. Quantifying lipofuscin in retinal pigment epithelium in vivo by visible-light optical coherence tomography-based multimodal imaging. Sci Rep 2020; 10:2942. [PMID: 32076069 PMCID: PMC7031367 DOI: 10.1038/s41598-020-59951-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 02/05/2020] [Indexed: 11/09/2022] Open
Abstract
Lipofuscin in the retinal pigment epithelium (RPE) is the major source of fundus autofluorescence (FAF). A technical challenge to accurately quantify the FAF intensities, thus the lipofuscin concentration, is to compensate the light attenuation of RPE melanin. We developed the VIS-OCT-FAF technology to accomplish optical coherence tomography (OCT) and FAF simultaneously with a single broadband visible light source. We demonstrated that light attenuation by RPE melanin can be assessed and corrected using the depth-resolved OCT signals. FAF images from albino and pigmented rats showed that without compensation, FAF signals from pigmented rats are lower than that from albinos. After compensation, however, FAF signals from pigmented rats are higher. This finding is supported by measurements of lipofuscin fluorophore A2E in the RPE using liquid chromatography/mass spectrometry (LC/MS) showing that compensated FAF intensities correlate linearly with A2E contents. The present work represents an important step toward accurately assessing RPE lipofuscin concentrations by FAF.
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Affiliation(s)
- Zahra Nafar
- Department of Biomedical Engineering, Florida International University, 10555 W Flagler St, Miami, FL, 33174, USA
| | - Rong Wen
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, 1638 NW 10 Ave, Miami, FL, 33136, USA.
| | - Ziqiang Guan
- Department of Biochemistry, Duke University School of Medicine, 307 Research Dr, Durham, NC, 27710, USA
| | - Yiwen Li
- Bascom Palmer Eye Institute, University of Miami Miller School of Medicine, 1638 NW 10 Ave, Miami, FL, 33136, USA
| | - Shuliang Jiao
- Department of Biomedical Engineering, Florida International University, 10555 W Flagler St, Miami, FL, 33174, USA.
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14
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Shores DR, Everett AD. Children as Biomarker Orphans: Progress in the Field of Pediatric Biomarkers. J Pediatr 2018; 193:14-20.e31. [PMID: 29031860 PMCID: PMC5794519 DOI: 10.1016/j.jpeds.2017.08.077] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Revised: 08/04/2017] [Accepted: 08/30/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Darla R Shores
- Division of Gastroenterology, Hepatology, and Nutrition, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD.
| | - Allen D Everett
- Division of Cardiology, Department of Pediatrics, Johns Hopkins School of Medicine, Baltimore, MD
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15
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Kimchi A, Khateb S, Wen R, Guan Z, Obolensky A, Beryozkin A, Kurtzman S, Blumenfeld A, Pras E, Jacobson SG, Ben-Yosef T, Newman H, Sharon D, Banin E. Nonsyndromic Retinitis Pigmentosa in the Ashkenazi Jewish Population: Genetic and Clinical Aspects. Ophthalmology 2017; 125:725-734. [PMID: 29276052 DOI: 10.1016/j.ophtha.2017.11.014] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2017] [Revised: 11/07/2017] [Accepted: 11/08/2017] [Indexed: 01/19/2023] Open
Abstract
PURPOSE To analyze the genetic and clinical findings in retinitis pigmentosa (RP) patients of Ashkenazi Jewish (AJ) descent, aiming to identify genotype-phenotype correlations. DESIGN Cohort study. PARTICIPANTS Retinitis pigmentosa patients from 230 families of AJ origin. METHODS Sanger sequencing was performed to detect specific founder mutations known to be prevalent in the AJ population. Ophthalmologic analysis included a comprehensive clinical examination, visual acuity (VA), visual fields, electroretinography, color vision testing, and retinal imaging by OCT, pseudocolor, and autofluorescence fundus photography. MAIN OUTCOME MEASURES Inheritance pattern and causative mutation; retinal function as assessed by VA, visual fields, and electroretinography results; and retinal structural changes observed on clinical funduscopy as well as by pseudocolor, autofluorescence, and OCT imaging. RESULTS The causative mutation was identified in 37% of families. The most prevalent RP-causing mutations are the Alu insertion (c.1297_8ins353, p.K433Rins31*) in the male germ cell-associated kinase (MAK) gene (39% of families with a known genetic cause for RP) and c.124A>G, p.K42E in dehydrodolichol diphosphate synthase (DHDDS) (33%). Additionally, disease-causing mutations were identified in 11 other genes. Analysis of clinical parameters of patients with mutations in the 2 most common RP-causing genes revealed that MAK patients had better VA and visual fields at relatively older ages in comparison with DHDDS patients. Funduscopic findings of DHDDS patients matched those of MAK patients who were 20 to 30 years older. Patients with DHDDS mutations were referred for electrophysiologic evaluation at earlier ages, and their cone responses became nondetectable at a much younger age than MAK patients. CONCLUSIONS Our AJ cohort of RP patients is the largest reported to date and showed a substantial difference in the genetic causes of RP compared with cohorts of other populations, mainly a high rate of autosomal recessive inheritance and a unique composition of causative genes. The most common RP-causing genes in our cohort, MAK and DHDDS, were not described as major causative genes in other populations. The clinical data show that in general, patients with biallelic MAK mutations had a later age of onset and a milder retinal phenotype compared with patients with biallelic DHDDS mutations.
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Affiliation(s)
- Adva Kimchi
- Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Samer Khateb
- Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Rong Wen
- Bascom Palmer Eye Institute, University of Miami, Miami, Florida
| | - Ziqiang Guan
- Duke University Medical Center, Durham, North Carolina
| | - Alexey Obolensky
- Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Avigail Beryozkin
- Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Shoshi Kurtzman
- Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Anat Blumenfeld
- Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel
| | - Eran Pras
- Department of Ophthalmology, Assaf Harofeh Medical Center, Zerifin, Israel; Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel
| | - Samuel G Jacobson
- Department of Ophthalmology, Scheie Eye Institute, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Tamar Ben-Yosef
- The Rappaport Faculty of Medicine, Technion-Israel Institute of Technology, Haifa, Israel
| | - Hadas Newman
- Sackler Faculty of Medicine, Tel-Aviv University, Tel-Aviv, Israel; Department of Ophthalmology, Sourasky Medical Center, Tel-Aviv, Israel
| | - Dror Sharon
- Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel.
| | - Eyal Banin
- Department of Ophthalmology, Hadassah-Hebrew University Medical Center, Jerusalem, Israel.
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16
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Long SL, Li YK, Xie YJ, Long ZF, Shi JF, Mo ZC. Neurite Outgrowth Inhibitor B Receptor: A Versatile Receptor with Multiple Functions and Actions. DNA Cell Biol 2017; 36:1142-1150. [PMID: 29058484 DOI: 10.1089/dna.2017.3813] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Members of the reticulon protein family are predominantly distributed within the endoplasmic reticulum. The neurite outgrowth inhibitor (Nogo) has three subtypes, including Nogo-A (200 kDa), Nogo-B (55 kDa), and Nogo-C (25 kDa). Nogo-A and Nogo-C are potent Nogos that are predominantly expressed in the central nervous system. Nogo-B, the splice variant of reticulon-4, is expressed widely in multiple human organ systems, including the liver, lung, kidney, blood vessels, and inflammatory cells. Moreover, the Nogo-B receptor (NgBR) can interact with Nogo-B and can independently affect nervous system regeneration, the chemotaxis of endothelial cells, proliferation, and apoptosis. In recent years, it has been demonstrated that NgBR plays an important role in human pathophysiological processes, including lipid metabolism, angiogenesis, N-glycosylation, cell apoptosis, chemoresistance in human hepatocellular carcinoma, and epithelial-mesenchymal transition. The pathophysiologic effects of NgBR have garnered increased attention, and the detection and enhancement of NgBR expression may be a novel approach to monitor the development and to improve the prognosis of relevant human clinical diseases.
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Affiliation(s)
- Shuang-Lian Long
- Department of Histology and Embryology, Clinical Anatomy and Reproductive Medicine Application Institute, University of South China , Hengyang, China
| | - Yu-Kun Li
- Department of Histology and Embryology, Clinical Anatomy and Reproductive Medicine Application Institute, University of South China , Hengyang, China
| | - Yuan-Jie Xie
- Department of Histology and Embryology, Clinical Anatomy and Reproductive Medicine Application Institute, University of South China , Hengyang, China
| | - Zhi-Feng Long
- Department of Histology and Embryology, Clinical Anatomy and Reproductive Medicine Application Institute, University of South China , Hengyang, China
| | - Jin-Feng Shi
- Department of Histology and Embryology, Clinical Anatomy and Reproductive Medicine Application Institute, University of South China , Hengyang, China
| | - Zhong-Cheng Mo
- Department of Histology and Embryology, Clinical Anatomy and Reproductive Medicine Application Institute, University of South China , Hengyang, China
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17
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Giladi M, Edri I, Goldenberg M, Newman H, Strulovich R, Khananshvili D, Haitin Y, Loewenstein A. Purification and characterization of human dehydrodolychil diphosphate synthase (DHDDS) overexpressed in E. coli. Protein Expr Purif 2017; 132:138-142. [PMID: 28167250 DOI: 10.1016/j.pep.2017.02.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2016] [Revised: 02/01/2017] [Accepted: 02/02/2017] [Indexed: 01/09/2023]
Abstract
Protein asparagine (N)-linked glycosylation is a post-translational modification that occurs in the endoplasmic reticulum; it plays an important role in protein folding, oligomerization, quality control, sorting, and transport. Accordingly, disorders of glycosylation may affect practically every organ system. Dehydrodolichyl diphosphate synthase (DHDDS) is an eukaryotic cis prenyltransferase (cis-PT) that catalyzes chain elongation of farnesyl diphosphate via multiple condensations with isopentenyl diphosphate to form dehydrodolichyl diphosphate, a precursor for the glycosyl carrier dolichylpyrophophate involved in N-linked glycosylation. Mutations in DHDDS were shown to result in retinitis pigmentosa, ultimately leading to blindness, but the exact molecular mechanism by which the mutations affect DHDDS function remains elusive. In addition, bacterial cis-PT homologs are involved in bacterial wall synthesis and are therefore potential targets for new antibacterial agents. However, as eukaryotic cis-PT were not thoroughly characterized structurally and functionally, rational design of prokaryotic cis-PT specific drugs is currently impossible. Here, we present a simple protocol for purification of functionally active human DHDDS under non-denaturating conditions using a codon-optimized construct. The purified protein forms a stable homodimer, similar to its bacterial homologs, and shows time- and substrate-dependent activity. Purification of this protein requires the presence of a detergent for protein solubility. The protocol described here may be utilized for the overexpression of other eukaryotic cis-PT. Future structural and functional studies of the recombinant DHDDS may shed light on the mechanisms underlying DHDDS-related retinitis pigmentosa and lead to novel therapeutic approaches.
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Affiliation(s)
- Moshe Giladi
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Tel Aviv Sourasky Medical Center, Tel Aviv, Israel.
| | - Ilan Edri
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | | | - Hadas Newman
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Department of Ophthalmology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
| | - Roi Strulovich
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Daniel Khananshvili
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Yoni Haitin
- Department of Physiology and Pharmacology, Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
| | - Anat Loewenstein
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; Department of Ophthalmology, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel
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18
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Grabińska KA, Park EJ, Sessa WC. cis-Prenyltransferase: New Insights into Protein Glycosylation, Rubber Synthesis, and Human Diseases. J Biol Chem 2016; 291:18582-90. [PMID: 27402831 PMCID: PMC5000101 DOI: 10.1074/jbc.r116.739490] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
cis-Prenyltransferases (cis-PTs) constitute a large family of enzymes conserved during evolution and present in all domains of life. cis-PTs catalyze consecutive condensation reactions of allylic diphosphate acceptor with isopentenyl diphosphate (IPP) in the cis (Z) configuration to generate linear polyprenyl diphosphate. The chain lengths of isoprenoid carbon skeletons vary widely from neryl pyrophosphate (C10) to natural rubber (C>10,000). The homo-dimeric bacterial enzyme, undecaprenyl diphosphate synthase (UPPS), has been structurally and mechanistically characterized in great detail and serves as a model for understanding the mode of action of eukaryotic cis-PTs. However, recent experiments have revealed that mammals, fungal, and long-chain plant cis-PTs are heteromeric enzymes composed of two distantly related subunits. In this review, the classification, function, and evolution of cis-PTs will be discussed with a special emphasis on the role of the newly described NgBR/Nus1 subunit and its plants' orthologs as essential, structural components of the cis-PTs activity.
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Affiliation(s)
- Kariona A Grabińska
- From the Department of Pharmacology and Vascular Biology and Therapeutics Program (VBT), Yale University School of Medicine, New Haven, Connecticut 06520
| | - Eon Joo Park
- From the Department of Pharmacology and Vascular Biology and Therapeutics Program (VBT), Yale University School of Medicine, New Haven, Connecticut 06520
| | - William C Sessa
- From the Department of Pharmacology and Vascular Biology and Therapeutics Program (VBT), Yale University School of Medicine, New Haven, Connecticut 06520
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19
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Sabry S, Vuillaumier-Barrot S, Mintet E, Fasseu M, Valayannopoulos V, Héron D, Dorison N, Mignot C, Seta N, Chantret I, Dupré T, Moore SEH. A case of fatal Type I congenital disorders of glycosylation (CDG I) associated with low dehydrodolichol diphosphate synthase (DHDDS) activity. Orphanet J Rare Dis 2016; 11:84. [PMID: 27343064 PMCID: PMC4919849 DOI: 10.1186/s13023-016-0468-1] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Accepted: 06/15/2016] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Type I congenital disorders of glycosylation (CDG-I) are mostly complex multisystemic diseases associated with hypoglycosylated serum glycoproteins. A subgroup harbour mutations in genes necessary for the biosynthesis of the dolichol-linked oligosaccharide (DLO) precursor that is essential for protein N-glycosylation. Here, our objective was to identify the molecular origins of disease in such a CDG-Ix patient presenting with axial hypotonia, peripheral hypertonia, enlarged liver, micropenis, cryptorchidism and sensorineural deafness associated with hypo glycosylated serum glycoproteins. RESULTS Targeted sequencing of DNA revealed a splice site mutation in intron 5 and a non-sense mutation in exon 4 of the dehydrodolichol diphosphate synthase gene (DHDDS). Skin biopsy fibroblasts derived from the patient revealed ~20 % residual DHDDS mRNA, ~35 % residual DHDDS activity, reduced dolichol-phosphate, truncated DLO and N-glycans, and an increased ratio of [2-(3)H]mannose labeled glycoprotein to [2-(3)H]mannose labeled DLO. Predicted truncated DHDDS transcripts did not complement rer2-deficient yeast. SiRNA-mediated down-regulation of DHDDS in human hepatocellular carcinoma HepG2 cells largely mirrored the biochemical phenotype of cells from the patient. The patient also harboured the homozygous ALG6(F304S) variant, which does not cause CDG but has been reported to be more frequent in PMM2-CDG patients with severe/fatal disease than in those with moderate presentations. WES did not reveal other strong candidate causal genes. CONCLUSIONS We describe a patient presenting with severe multisystem disease associated with DHDDS deficiency. As retinitis pigmentosa is the only clinical sign in previously reported cases, this report broadens the spectrum of phenotypes associated with this condition.
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Affiliation(s)
- S Sabry
- INSERM U1149, Faculté de Médecine Xavier Bichat, 16 rue Henri Huchard, Paris, France.,Université Denis Diderot, Paris 7, Paris, France.,Université Pierre et Marie Curie, Paris 6, Paris, France.,Biochemical Genetics Department, Human Genetics Division, National Research Center NRC, Cairo, Egypt
| | - S Vuillaumier-Barrot
- INSERM U1149, Faculté de Médecine Xavier Bichat, 16 rue Henri Huchard, Paris, France.,Université Denis Diderot, Paris 7, Paris, France.,AP-HP, Hôpital Bichat-Claude Bernard, Biochimie, Paris, France
| | - E Mintet
- INSERM U1149, Faculté de Médecine Xavier Bichat, 16 rue Henri Huchard, Paris, France.,Université Denis Diderot, Paris 7, Paris, France
| | - M Fasseu
- INSERM U1149, Faculté de Médecine Xavier Bichat, 16 rue Henri Huchard, Paris, France.,Université Denis Diderot, Paris 7, Paris, France
| | - V Valayannopoulos
- Département de Pédiatrie, AP-HP, Hôpital Necker-Enfants Malades, Paris, France
| | - D Héron
- Département de Génétique & Centre de Référence Déficiences Intellectuelles de Causes Rares, Hôpital Pitié Salpétrière, Paris, France.,Groupe de Recherche Clinique « Déficience Intellectuelle et Autisme » UPMC, Paris, France
| | - N Dorison
- Groupe de Recherche Clinique « Déficience Intellectuelle et Autisme » UPMC, Paris, France
| | - C Mignot
- Département de Génétique & Centre de Référence Déficiences Intellectuelles de Causes Rares, Hôpital Pitié Salpétrière, Paris, France.,Groupe de Recherche Clinique « Déficience Intellectuelle et Autisme » UPMC, Paris, France.,Neuropédiatrie, Hôpital Trousseau, Paris, France
| | - N Seta
- AP-HP, Hôpital Bichat-Claude Bernard, Biochimie, Paris, France.,Université Paris Descartes, Paris, France
| | - I Chantret
- INSERM U1149, Faculté de Médecine Xavier Bichat, 16 rue Henri Huchard, Paris, France.,Université Denis Diderot, Paris 7, Paris, France
| | - T Dupré
- INSERM U1149, Faculté de Médecine Xavier Bichat, 16 rue Henri Huchard, Paris, France.,Université Denis Diderot, Paris 7, Paris, France.,AP-HP, Hôpital Bichat-Claude Bernard, Biochimie, Paris, France
| | - S E H Moore
- INSERM U1149, Faculté de Médecine Xavier Bichat, 16 rue Henri Huchard, Paris, France. .,Université Denis Diderot, Paris 7, Paris, France.
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20
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Gorden DL, Myers DS, Ivanova PT, Fahy E, Maurya MR, Gupta S, Min J, Spann NJ, McDonald JG, Kelly SL, Duan J, Sullards MC, Leiker TJ, Barkley RM, Quehenberger O, Armando AM, Milne SB, Mathews TP, Armstrong MD, Li C, Melvin WV, Clements RH, Washington MK, Mendonsa AM, Witztum JL, Guan Z, Glass CK, Murphy RC, Dennis EA, Merrill AH, Russell DW, Subramaniam S, Brown HA. Biomarkers of NAFLD progression: a lipidomics approach to an epidemic. J Lipid Res 2015; 56:722-736. [PMID: 25598080 DOI: 10.1194/jlr.p056002] [Citation(s) in RCA: 237] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
The spectrum of nonalcoholic fatty liver disease (NAFLD) includes steatosis, nonalcoholic steatohepatitis (NASH), and cirrhosis. Recognition and timely diagnosis of these different stages, particularly NASH, is important for both potential reversibility and limitation of complications. Liver biopsy remains the clinical standard for definitive diagnosis. Diagnostic tools minimizing the need for invasive procedures or that add information to histologic data are important in novel management strategies for the growing epidemic of NAFLD. We describe an "omics" approach to detecting a reproducible signature of lipid metabolites, aqueous intracellular metabolites, SNPs, and mRNA transcripts in a double-blinded study of patients with different stages of NAFLD that involves profiling liver biopsies, plasma, and urine samples. Using linear discriminant analysis, a panel of 20 plasma metabolites that includes glycerophospholipids, sphingolipids, sterols, and various aqueous small molecular weight components involved in cellular metabolic pathways, can be used to differentiate between NASH and steatosis. This identification of differential biomolecular signatures has the potential to improve clinical diagnosis and facilitate therapeutic intervention of NAFLD.
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Affiliation(s)
- D Lee Gorden
- Departments of Surgery, Vanderbilt University Medical Center, Nashville, TN; Cancer Biology, Vanderbilt University Medical Center, Nashville, TN
| | - David S Myers
- Pharmacology, Vanderbilt University Medical Center, Nashville, TN
| | | | - Eoin Fahy
- Department of Bioengineering, School of Engineering, University of California, San Diego, La Jolla, CA
| | - Mano R Maurya
- Department of Bioengineering, School of Engineering, University of California, San Diego, La Jolla, CA
| | - Shakti Gupta
- Department of Bioengineering, School of Engineering, University of California, San Diego, La Jolla, CA
| | - Jun Min
- Department of Bioengineering, School of Engineering, University of California, San Diego, La Jolla, CA
| | - Nathanael J Spann
- Departments of Cellular and Molecular Medicine and Medicine, University of California, San Diego, La Jolla, CA
| | - Jeffrey G McDonald
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX
| | - Samuel L Kelly
- Schools of Biology, Chemistry, and Biochemistry, and the Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA
| | - Jingjing Duan
- Schools of Biology, Chemistry, and Biochemistry, and the Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA
| | - M Cameron Sullards
- Schools of Biology, Chemistry, and Biochemistry, and the Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA
| | - Thomas J Leiker
- Department of Pharmacology, University of Colorado at Denver, Aurora, CO
| | - Robert M Barkley
- Department of Pharmacology, University of Colorado at Denver, Aurora, CO
| | - Oswald Quehenberger
- Departments of Medicine, School of Medicine, University of California, San Diego, La Jolla, CA; Pharmacology, School of Medicine, University of California, San Diego, La Jolla, CA
| | - Aaron M Armando
- Pharmacology, School of Medicine, University of California, San Diego, La Jolla, CA
| | - Stephen B Milne
- Pharmacology, Vanderbilt University Medical Center, Nashville, TN
| | - Thomas P Mathews
- Pharmacology, Vanderbilt University Medical Center, Nashville, TN
| | | | - Chijun Li
- Department of Biochemistry, Duke University Medical Center, Durham, NC
| | - Willie V Melvin
- Departments of Surgery, Vanderbilt University Medical Center, Nashville, TN
| | - Ronald H Clements
- Departments of Surgery, Vanderbilt University Medical Center, Nashville, TN
| | - M Kay Washington
- Pathology, Microbiology, and Immunology, Vanderbilt University Medical Center, Nashville, TN
| | | | - Joseph L Witztum
- Departments of Medicine, School of Medicine, University of California, San Diego, La Jolla, CA
| | - Ziqiang Guan
- Department of Biochemistry, Duke University Medical Center, Durham, NC
| | - Christopher K Glass
- Departments of Cellular and Molecular Medicine and Medicine, University of California, San Diego, La Jolla, CA
| | - Robert C Murphy
- Department of Pharmacology, University of Colorado at Denver, Aurora, CO
| | - Edward A Dennis
- Pharmacology, School of Medicine, University of California, San Diego, La Jolla, CA; Chemistry and Biochemistry, School of Medicine, University of California, San Diego, La Jolla, CA
| | - Alfred H Merrill
- Schools of Biology, Chemistry, and Biochemistry, and the Parker H. Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA
| | - David W Russell
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX
| | - Shankar Subramaniam
- Department of Bioengineering, School of Engineering, University of California, San Diego, La Jolla, CA; Chemistry and Biochemistry, School of Medicine, University of California, San Diego, La Jolla, CA.
| | - H Alex Brown
- Pharmacology, Vanderbilt University Medical Center, Nashville, TN; Biochemistry, and the Vanderbilt Institute of Chemical Biology, Vanderbilt University Medical Center, Nashville, TN.
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21
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Buczkowska A, Swiezewska E, Lefeber DJ. Genetic defects in dolichol metabolism. J Inherit Metab Dis 2015; 38:157-69. [PMID: 25270028 PMCID: PMC4281381 DOI: 10.1007/s10545-014-9760-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Revised: 07/25/2014] [Accepted: 08/01/2014] [Indexed: 11/27/2022]
Abstract
Congenital disorders of glycosylation (CDG) comprise a group of inborn errors of metabolism with abnormal glycosylation of proteins and lipids. Patients with defective protein N-glycosylation are identified in routine metabolic screening via analysis of serum transferrin glycosylation. Defects in the assembly of the dolichol linked Glc(3)Man(9)GlcNAc(2) glycan and its transfer to proteins lead to the (partial) absence of complete glycans on proteins. These defects are called CDG-I and are located in the endoplasmic reticulum (ER) or cytoplasm. Defects in the subsequent processing of protein bound glycans result in the presence of truncated glycans on proteins. These defects are called CDG-II and the enzymes involved are located mainly in the Golgi apparatus. In recent years, human defects have been identified in dolichol biosynthesis genes within the group of CDG-I patients. This has increased interest in dolichol metabolism, has resulted in specific recognizable clinical symptoms in CDG-I and has offered new mechanistic insights in dolichol biosynthesis. We here review its biosynthetic pathways, the clinical and biochemical phenotypes in dolichol-related CDG defects, up to the formation of dolichyl-P-mannose (Dol-P-Man), and discuss existing evidence of regulatory networks in dolichol metabolism to provide an outlook on therapeutic strategies.
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Affiliation(s)
- Anna Buczkowska
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawinskiego 5a, 02-106 Warsaw, Poland
| | - Ewa Swiezewska
- Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawinskiego 5a, 02-106 Warsaw, Poland
- Department of Lipid Biochemistry, Institute of Biochemistry and Biophysics, Polish Academy of Sciences, Pawinskiego 5a, 02-106 Warsaw, Poland
| | - Dirk J. Lefeber
- Department of Neurology, Laboratory of Genetic, Endocrine and Metabolic Diseases, Radboud University Medical Center, Geert Grooteplein 10, 6525 GA Nijmegen, The Netherlands
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22
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Park EJ, Grabińska KA, Guan Z, Stránecký V, Hartmannová H, Hodaňová K, Barešová V, Sovová J, Jozsef L, Ondrušková N, Hansíková H, Honzík T, Zeman J, Hůlková H, Wen R, Kmoch S, Sessa WC. Mutation of Nogo-B receptor, a subunit of cis-prenyltransferase, causes a congenital disorder of glycosylation. Cell Metab 2014; 20:448-57. [PMID: 25066056 PMCID: PMC4161961 DOI: 10.1016/j.cmet.2014.06.016] [Citation(s) in RCA: 98] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/11/2014] [Revised: 05/28/2014] [Accepted: 06/14/2014] [Indexed: 11/20/2022]
Abstract
Dolichol is an obligate carrier of glycans for N-linked protein glycosylation, O-mannosylation, and GPI anchor biosynthesis. cis-prenyltransferase (cis-PTase) is the first enzyme committed to the synthesis of dolichol. However, the proteins responsible for mammalian cis-PTase activity have not been delineated. Here we show that Nogo-B receptor (NgBR) is a subunit required for dolichol synthesis in yeast, mice, and man. Moreover, we describe a family with a congenital disorder of glycosylation caused by a loss of function mutation in the conserved C terminus of NgBR-R290H and show that fibroblasts isolated from patients exhibit reduced dolichol profiles and enhanced accumulation of free cholesterol identically to fibroblasts from mice lacking NgBR. Mutation of NgBR-R290H in man and orthologs in yeast proves the importance of this evolutionarily conserved residue for mammalian cis-PTase activity and function. Thus, these data provide a genetic basis for the essential role of NgBR in dolichol synthesis and protein glycosylation.
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Affiliation(s)
- Eon Joo Park
- Department of Pharmacology and Vascular Biology and Therapeutics Program, Yale University School of Medicine, 10 Amistad Street, New Haven, CT 06520, USA
| | - Kariona A Grabińska
- Department of Pharmacology and Vascular Biology and Therapeutics Program, Yale University School of Medicine, 10 Amistad Street, New Haven, CT 06520, USA
| | - Ziqiang Guan
- Department of Biochemistry, Duke University Medical Center, DUMC 2927, Durham, NC 27710, USA
| | - Viktor Stránecký
- Institute for Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital, Ke Karlovu 2, Prague 2, 128 08 Czech Republic
| | - Hana Hartmannová
- Institute for Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital, Ke Karlovu 2, Prague 2, 128 08 Czech Republic
| | - Kateřina Hodaňová
- Institute for Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital, Ke Karlovu 2, Prague 2, 128 08 Czech Republic
| | - Veronika Barešová
- Institute for Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital, Ke Karlovu 2, Prague 2, 128 08 Czech Republic
| | - Jana Sovová
- Institute for Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital, Ke Karlovu 2, Prague 2, 128 08 Czech Republic
| | - Levente Jozsef
- Department of Pharmacology and Vascular Biology and Therapeutics Program, Yale University School of Medicine, 10 Amistad Street, New Haven, CT 06520, USA
| | - Nina Ondrušková
- Department of Pediatrics, First Faculty of Medicine, Charles University and General University Hospital, Ke Karlovu 2, Prague 2, 128 08 Czech Republic
| | - Hana Hansíková
- Department of Pediatrics, First Faculty of Medicine, Charles University and General University Hospital, Ke Karlovu 2, Prague 2, 128 08 Czech Republic
| | - Tomáš Honzík
- Department of Pediatrics, First Faculty of Medicine, Charles University and General University Hospital, Ke Karlovu 2, Prague 2, 128 08 Czech Republic
| | - Jiří Zeman
- Department of Pediatrics, First Faculty of Medicine, Charles University and General University Hospital, Ke Karlovu 2, Prague 2, 128 08 Czech Republic
| | - Helena Hůlková
- Institute for Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital, Ke Karlovu 2, Prague 2, 128 08 Czech Republic
| | - Rong Wen
- Bascom Palmer Eye Institute, University of Miami, Miller School of Medicine, 900 NW 17th Street, Miami, FL 33136, USA
| | - Stanislav Kmoch
- Institute for Inherited Metabolic Disorders, First Faculty of Medicine, Charles University and General University Hospital, Ke Karlovu 2, Prague 2, 128 08 Czech Republic.
| | - William C Sessa
- Department of Pharmacology and Vascular Biology and Therapeutics Program, Yale University School of Medicine, 10 Amistad Street, New Haven, CT 06520, USA.
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