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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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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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Solanes-Casado S, Cebrián A, Rodríguez-Remírez M, Mahíllo I, García-García L, Río-Vilariño A, Baños N, de Cárcer G, Monfort-Vengut A, Castellano V, Fernández-Aceñero MJ, García-Foncillas J, Del Puerto-Nevado L. Overcoming PLK1 inhibitor resistance by targeting mevalonate pathway to impair AXL-TWIST axis in colorectal cancer. Biomed Pharmacother 2021; 144:112347. [PMID: 34700228 DOI: 10.1016/j.biopha.2021.112347] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Revised: 10/06/2021] [Accepted: 10/13/2021] [Indexed: 12/11/2022] Open
Abstract
New therapeutic targets are revolutionizing colorectal cancer clinical management, opening new horizons in metastatic patients' outcome. Polo Like Kinase1 (PLK1) inhibitors have high potential as antitumoral agents, however, the emergence of drug resistance is a major challenge for their use in clinical practice. Overcoming this challenge represents a hot topic in current drug discovery research. BI2536-resistant colorectal cancer cell lines HT29R, RKOR, SW837R and HCT116R, were generated in vitro and validated by IG50 assays and xenografts models by the T/C ratio. Exons 1 and 2 of PLK1 gene were sequenced by Sanger method. AXL pathway, Epithelial-to-Mesenchymal transition (EMT) and Multidrug Resistance (MDR1) were studied by qPCR and western blot in resistant cells. Simvastatin as a re-sensitizer drug was tested in vitro and the drug combination strategies were validated in vitro and in vivo. PLK1 gene mutation R136G was found for RKOR. AXL pathway trough TWIST1 transcription factor was identified as one of the mechanisms involved in HT29R, SW837R and HCT116R lines, inducing EMT and upregulation of MDR1. Simvastatin was able to impair the mechanisms activated by adaptive resistance and its combination with BI2536 re-sensitized resistant cells in vitro and in vivo. Targeting the mevalonate pathway contributes to re-sensitizing BI2536-resistant cells in vitro and in vivo, raising as a new strategy for the clinical management of PLK1 inhibitors.
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Affiliation(s)
- Sonia Solanes-Casado
- Translational Oncology Division, Oncohealth Institute, IIS - Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Madrid, Spain
| | - Arancha Cebrián
- Translational Oncology Division, Oncohealth Institute, IIS - Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Madrid, Spain.
| | | | - Ignacio Mahíllo
- Department of Statistics, IIS - Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Madrid, Spain
| | - Laura García-García
- Translational Oncology Division, Oncohealth Institute, IIS - Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Madrid, Spain
| | - Anxo Río-Vilariño
- Translational Oncology Division, Oncohealth Institute, IIS - Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Madrid, Spain
| | - Natalia Baños
- Translational Oncology Division, Oncohealth Institute, IIS - Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Madrid, Spain
| | - Guillermo de Cárcer
- Cell Cycle & Cancer Biomarkers Group, Instituto de Investigaciones Biomédicas "Alberto Sols" (IIBm) CSIC-UAM, 28029 Madrid, Spain
| | - Ana Monfort-Vengut
- Cell Cycle & Cancer Biomarkers Group, Instituto de Investigaciones Biomédicas "Alberto Sols" (IIBm) CSIC-UAM, 28029 Madrid, Spain
| | - Víctor Castellano
- Department of Pathology, Fundación Jiménez Díaz University Hospital (UAM), Madrid, Spain
| | - Maria Jesús Fernández-Aceñero
- Department of Pathology, Hospital Clínico San Carlos, Instituto de Investigación Sanitaria del Hospital Clínico San Carlos (IdISSC), Madrid, Spain
| | - Jesús García-Foncillas
- Translational Oncology Division, Oncohealth Institute, IIS - Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Madrid, Spain.
| | - Laura Del Puerto-Nevado
- Translational Oncology Division, Oncohealth Institute, IIS - Fundación Jiménez Díaz University Hospital (IIS-FJD, UAM), Madrid, Spain.
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Esmail S, Manolson MF. Advances in understanding N-glycosylation structure, function, and regulation in health and disease. Eur J Cell Biol 2021; 100:151186. [PMID: 34839178 DOI: 10.1016/j.ejcb.2021.151186] [Citation(s) in RCA: 73] [Impact Index Per Article: 24.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 11/14/2021] [Accepted: 11/18/2021] [Indexed: 01/17/2023] Open
Abstract
N-linked glycosylation is a post-translational modification crucial for membrane protein folding, stability and other cellular functions. Alteration of membrane protein N-glycans is implicated in wide range of pathological conditions including cancer metastasis, chronic inflammatory diseases, and viral pathogenesis. Even though the roles of N-glycans have been studied extensively, our knowledge of their mechanisms remains unclear due to the lack of detailed structural analysis of the N-glycome. Mapping the N-glycome landscape will open new avenues to explore disease mechanisms and identify novel therapeutic targets. This review discusses the diverse structure of N-linked glycans, the function and regulation of N-glycosylation in health and disease, and ends with a focus on recent approaches to target N-glycans in rheumatoid arthritis and cancer metastasis.
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Affiliation(s)
- Sally Esmail
- Faculty of Dentistry, University of Toronto, Toronto, Ontario M5G 1G6, Canada.
| | - Morris F Manolson
- Faculty of Dentistry, University of Toronto, Toronto, Ontario M5G 1G6, Canada
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Pronin AV, Narovlyansky AN, Sanin AV. New Approaches to the Prevention and Treatment of Viral Diseases. Arch Immunol Ther Exp (Warsz) 2021; 69:10. [PMID: 33811524 PMCID: PMC8019082 DOI: 10.1007/s00005-021-00613-w] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Accepted: 03/23/2021] [Indexed: 11/01/2022]
Abstract
The review discusses a new approach to the prevention and treatment of viral infections based on the use of pine needles polyprenyl phosphate (PPP) and associated with the infringement of prenylation process-the attachment of farnesol or geranyl geraniol to the viral protein. Currently, prenylation has been detected in type 1 adenovirus, hepatitis C virus, several herpes viruses, influenza virus, HIV. However, this list is far from complete, given that prenylated proteins play an extremely important role in the activity of the virus. We assume that the interferon produced in response to PPP may suppress expression of the SREBP2 transcription factor. As a result, the mevalonic acid pathway is violated and, as a result, the formation of early polyprenols precursors (geraniol, geranyl geraniol, farnesol), which are necessary for the prenylation of viral proteins, is blocked and the formation of mature, virulent virus particles is broken. As a consequence, the maturation of viral particles is inhibited, and defective particles are formed. Polyprenol was extracted from greenery (pine, fir and spruce needles, mulberry leaves, etc.), purified by chromatography, phosphorylated and identified by HPLC and NMR. Obtained PPP was used as antiviral in some experimental models in vitro and in vivo. During numerous studies, it was found that PPP manifested versatile antiviral effects, both in vitro and in vivo. The maximum effect was observed with viruses in which the presence of prenylated proteins was established, namely influenza A virus, HIV-1, tick-borne encephalitis virus, hepatitis A and C viruses, herpes simplex viruses type 1 and 2, some coronavirus. The available data obtained both in the experimental conditions and during clinical trials allow us to regard PPPs as safe and effective medicine for prevention and treatment of viral diseases.
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Affiliation(s)
- Alexander V Pronin
- N.F. Gamaleya National Research Center of Epidemiology and Microbiology of the Ministry of Health of Russia, Gamaleya 18, Moscow, Russia, 123098.
| | - Alexander N Narovlyansky
- N.F. Gamaleya National Research Center of Epidemiology and Microbiology of the Ministry of Health of Russia, Gamaleya 18, Moscow, Russia, 123098
| | - Alexander V Sanin
- N.F. Gamaleya National Research Center of Epidemiology and Microbiology of the Ministry of Health of Russia, Gamaleya 18, Moscow, Russia, 123098
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Cholesterol metabolism: New functions and therapeutic approaches in cancer. Biochim Biophys Acta Rev Cancer 2020; 1874:188394. [PMID: 32698040 DOI: 10.1016/j.bbcan.2020.188394] [Citation(s) in RCA: 159] [Impact Index Per Article: 39.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 07/08/2020] [Accepted: 07/12/2020] [Indexed: 02/05/2023]
Abstract
Cholesterol and its metabolites (precursors and derivatives) play an important role in cancer. In recent years, numerous studies have reported the functions of cholesterol metabolism in the regulation of tumor biological processes, especially oncogenic signaling pathways, ferroptosis, and tumor microenvironment. Preclinical studies have over the years indicated the inhibitory effects of blocking cholesterol synthesis and uptake on tumor formation and growth. Besides, some new cholesterol metabolic molecules such as SOAT1, SQLE, and NPC1 have recently emerged as promising drug targets for cancer treatment. Here, we systematically review the roles of cholesterol and its metabolites, and the latest advances in cancer therapy targeting cholesterol metabolism.
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Workman SD, Strynadka NCJ. A Slippery Scaffold: Synthesis and Recycling of the Bacterial Cell Wall Carrier Lipid. J Mol Biol 2020; 432:4964-4982. [PMID: 32234311 DOI: 10.1016/j.jmb.2020.03.025] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2020] [Revised: 03/18/2020] [Accepted: 03/25/2020] [Indexed: 01/20/2023]
Abstract
The biosynthesis of bacterial cell envelope polysaccharides such as peptidoglycan relies on the use of a dedicated carrier lipid both for the assembly of precursors at the cytoplasmic face of the plasma membrane and for the translocation of lipid linked oligosaccharides across the plasma membrane into the periplasmic space. This dedicated carrier lipid, undecaprenyl phosphate, results from the dephosphorylation of undecaprenyl pyrophosphate, which is generated de novo in the cytoplasm by undecaprenyl pyrophosphate synthase and released as a by-product when newly synthesized glycans are incorporated into the existing cell envelope. The de novo synthesis of undecaprenyl pyrophosphate has been thoroughly characterized from a structural and mechanistic standpoint; however, its dephosphorylation to the active carrier lipid form, both in the course of de novo synthesis and recycling, has only been begun to be studied in depth in recent years. This review provides an overview of bacterial carrier lipid synthesis and presents the current state of knowledge regarding bacterial carrier lipid recycling.
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Affiliation(s)
- Sean D Workman
- Department of Biochemistry and Molecular Biology and the Center for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, Canada V6T 1Z3
| | - Natalie C J Strynadka
- Department of Biochemistry and Molecular Biology and the Center for Blood Research, University of British Columbia, 2350 Health Sciences Mall, Vancouver, BC, Canada V6T 1Z3.
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Cheng L, Kong C, Walvoort MTC, Faas MM, de Vos P. Human Milk Oligosaccharides Differently Modulate Goblet Cells Under Homeostatic, Proinflammatory Conditions and ER Stress. Mol Nutr Food Res 2020; 64:e1900976. [PMID: 31800974 PMCID: PMC7079026 DOI: 10.1002/mnfr.201900976] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2019] [Revised: 11/21/2019] [Indexed: 12/14/2022]
Abstract
SCOPE Human milk oligosaccharides (hMOs) have beneficial effects on intestinal barrier function, but the mechanisms of action are not well understood. Here, the effects of hMOs on goblet cells, which indicate that some hMOs may enhance mucus barrier function through direct modulation of goblet cell function, are studied. METHODS AND RESULTS The modulatory effects of 2'-fucosyllactose (2'-FL), 3-fucosyllactose (3-FL), lacto-N-triaose II (LNT2), and galacto-oligosaccharides (GOS) on the expression of goblet cell secretory related genes MUC2, TFF3, and RETNLB, and the Golgi-sulfotransferase genes CHST5 and GAL3ST2 of LS174T are determined by real-time quantitative RT-PCR. 3-FL, LNT2, and GOS-modulated LS174T gene expression profiles in a dose- and time-dependent manner. In addition, the upregulation of MUC2 is confirmed by immunofluorescence staining. Effects of 2'-FL, 3-FL, LNT2, and GOS on gene transcription of LS174T are also assessed during exposure to TNF-α, IL-13, or tunicamycin. During TNF-α challenge, 3-FL and LNT2 enhance MUC2 and TFF3 gene expression. After IL-13 exposure, 2'-FL, 3-FL, and LNT2 all show upregulating effects on MUC2; 3-FL and LNT2 also enhance TFF3 expression. LNT2 significantly reverses Tm-induced downregulation of TFF3, RETNLB, and CHST5. CONCLUSION The findings indicate that hMOs may enhance mucus barrier function through direct modulation of intestinal goblet cells. Effects are structure- and stressor-dependent.
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Affiliation(s)
- Lianghui Cheng
- Immunoendocrinology, Division of Medical BiologyDepartment of Pathology and Medical BiologyUniversity Medical Center GroningenUniversity of GroningenHanzeplein 19700 RBGroningenThe Netherlands
| | - Chunli Kong
- Immunoendocrinology, Division of Medical BiologyDepartment of Pathology and Medical BiologyUniversity Medical Center GroningenUniversity of GroningenHanzeplein 19700 RBGroningenThe Netherlands
| | - Marthe T. C. Walvoort
- Stratingh Institute for Chemistry, Faculty of Science and EngineeringUniversity of Groningen9700 RBGroningenThe Netherlands
| | - Marijke M. Faas
- Immunoendocrinology, Division of Medical BiologyDepartment of Pathology and Medical BiologyUniversity Medical Center GroningenUniversity of GroningenHanzeplein 19700 RBGroningenThe Netherlands
| | - Paul de Vos
- Immunoendocrinology, Division of Medical BiologyDepartment of Pathology and Medical BiologyUniversity Medical Center GroningenUniversity of GroningenHanzeplein 19700 RBGroningenThe Netherlands
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Zhou C, Zhang W, Wen Q, Bu P, Gao J, Wang G, Jin J, Song Y, Sun X, Zhang Y, Jiang X, Yu H, Peng C, Shen Y, Price M, Li J, Zhang X, Fan Z, Yue B. Comparative Genomics Reveals the Genetic Mechanisms of Musk Secretion and Adaptive Immunity in Chinese Forest Musk Deer. Genome Biol Evol 2019; 11:1019-1032. [PMID: 30903183 PMCID: PMC6450037 DOI: 10.1093/gbe/evz055] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/04/2019] [Indexed: 02/05/2023] Open
Abstract
The Chinese forest musk deer (Moschus berezovskii; FMD) is an artiodactyl mammal and is both economically valuable and highly endangered. To investigate the genetic mechanisms of musk secretion and adaptive immunity in FMD, we compared its genome to nine other artiodactyl genomes. Comparative genomics demonstrated that eight positively selected genes (PSGs) in FMD were annotated in three KEGG pathways that were related to metabolic and synthetic activity of musk, similar to previous transcriptome studies. Functional enrichment analysis indicated that many PSGs were involved in the regulation of immune system processes, implying important reorganization of the immune system in FMD. FMD-specific missense mutations were found in two PSGs (MHC class II antigen DRA and ADA) that were classified as deleterious by PolyPhen-2, possibly contributing to immune adaptation to infectious diseases. Functional assessment showed that the FMD-specific mutation enhanced the ADA activity, which was likely to strengthen the immune defense against pathogenic invasion. Single nucleotide polymorphism-based inference showed the recent demographic trajectory for FMD. Our data and findings provide valuable genomic resources not only for studying the genetic mechanisms of musk secretion and adaptive immunity, but also for facilitating more effective management of the captive breeding programs for this endangered species.
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Affiliation(s)
- Chuang Zhou
- Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Wenbo Zhang
- Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Qinchao Wen
- Sichuan Key Laboratory of Conservation Biology on Endangered Wildlife, College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Ping Bu
- Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Jie Gao
- Sichuan Key Laboratory of Conservation Biology on Endangered Wildlife, College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Guannan Wang
- Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Jiazheng Jin
- Sichuan Engineering Research Center for Medicinal Animals, Xichang, P.R. China
| | - Yinjie Song
- Center of Infectious Diseases, West China Hospital, Sichuan University and Collaborative Innovation Center of Biotherapy, Chengdu, P.R. China
| | - Xiaohong Sun
- Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Yifan Zhang
- Sichuan Key Laboratory of Conservation Biology on Endangered Wildlife, College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Xue Jiang
- Sichuan Engineering Research Center for Medicinal Animals, Xichang, P.R. China
| | - Haoran Yu
- Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Changjun Peng
- Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Yongmei Shen
- Sichuan Engineering Research Center for Medicinal Animals, Xichang, P.R. China
| | - Megan Price
- Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Jing Li
- Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Xiuyue Zhang
- Sichuan Key Laboratory of Conservation Biology on Endangered Wildlife, College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Zhenxin Fan
- Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, P.R. China
| | - Bisong Yue
- Key Laboratory of Bioresources and Ecoenvironment (Ministry of Education), College of Life Sciences, Sichuan University, Chengdu, P.R. China
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Medina-Cano D, Ucuncu E, Nguyen LS, Nicouleau M, Lipecka J, Bizot JC, Thiel C, Foulquier F, Lefort N, Faivre-Sarrailh C, Colleaux L, Guerrera IC, Cantagrel V. High N-glycan multiplicity is critical for neuronal adhesion and sensitizes the developing cerebellum to N-glycosylation defect. eLife 2018; 7:38309. [PMID: 30311906 PMCID: PMC6185108 DOI: 10.7554/elife.38309] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2018] [Accepted: 10/01/2018] [Indexed: 12/14/2022] Open
Abstract
Proper brain development relies highly on protein N-glycosylation to sustain neuronal migration, axon guidance and synaptic physiology. Impairing the N-glycosylation pathway at early steps produces broad neurological symptoms identified in congenital disorders of glycosylation. However, little is known about the molecular mechanisms underlying these defects. We generated a cerebellum specific knockout mouse for Srd5a3, a gene involved in the initiation of N-glycosylation. In addition to motor coordination defects and abnormal granule cell development, Srd5a3 deletion causes mild N-glycosylation impairment without significantly altering ER homeostasis. Using proteomic approaches, we identified that Srd5a3 loss affects a subset of glycoproteins with high N-glycans multiplicity per protein and decreased protein abundance or N-glycosylation level. As IgSF-CAM adhesion proteins are critical for neuron adhesion and highly N-glycosylated, we observed impaired IgSF-CAM-mediated neurite outgrowth and axon guidance in Srd5a3 mutant cerebellum. Our results link high N-glycan multiplicity to fine-tuned neural cell adhesion during mammalian brain development.
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Affiliation(s)
- Daniel Medina-Cano
- Paris Descartes-Sorbonne Paris Cité University, Paris, France.,Developmental Brain Disorders Laboratory, Imagine Institute, INSERM UMR 1163, Paris, France
| | - Ekin Ucuncu
- Paris Descartes-Sorbonne Paris Cité University, Paris, France.,Developmental Brain Disorders Laboratory, Imagine Institute, INSERM UMR 1163, Paris, France
| | - Lam Son Nguyen
- Paris Descartes-Sorbonne Paris Cité University, Paris, France.,Developmental Brain Disorders Laboratory, Imagine Institute, INSERM UMR 1163, Paris, France
| | - Michael Nicouleau
- Paris Descartes-Sorbonne Paris Cité University, Paris, France.,Developmental Brain Disorders Laboratory, Imagine Institute, INSERM UMR 1163, Paris, France
| | - Joanna Lipecka
- Proteomics platform 3P5-Necker, Université Paris Descartes - Structure Fédérative de Recherche Necker, INSERM US24/CNRS UMS3633, Paris, France
| | | | - Christian Thiel
- Center for Child and Adolescent Medicine, Kinderheilkunde I, University of Heidelberg, Heidelberg, Germany
| | - François Foulquier
- Université Lille, UMR 8576 - UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, CNRS, Lille, France
| | | | | | - Laurence Colleaux
- Paris Descartes-Sorbonne Paris Cité University, Paris, France.,Developmental Brain Disorders Laboratory, Imagine Institute, INSERM UMR 1163, Paris, France
| | - Ida Chiara Guerrera
- Proteomics platform 3P5-Necker, Université Paris Descartes - Structure Fédérative de Recherche Necker, INSERM US24/CNRS UMS3633, Paris, France
| | - Vincent Cantagrel
- Paris Descartes-Sorbonne Paris Cité University, Paris, France.,Developmental Brain Disorders Laboratory, Imagine Institute, INSERM UMR 1163, Paris, France
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Jiang L, Wang J, Asghar F, Snyder N, Cunningham KW. CaGdt1 plays a compensatory role for the calcium pump CaPmr1 in the regulation of calcium signaling and cell wall integrity signaling in Candida albicans. Cell Commun Signal 2018; 16:33. [PMID: 29954393 PMCID: PMC6025805 DOI: 10.1186/s12964-018-0246-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Accepted: 06/12/2018] [Indexed: 12/26/2022] Open
Abstract
BACKGROUND Saccharomyces cerevisiae ScGdt1 and mammalian TMEM165 are two members of the UPF0016 membrane protein family that is likely to form a new group of Ca2+/H+ antiporter and/or a Mn2+ transporter in the Golgi apparatus. We have previously shown that Candida albicans CaGDT1 is a functional ortholog of ScGDT1 in the response of S. cerevisiae to calcium stress. However, how CaGdt1 together with the Golgi calcium pump CaPmr1 regulate calcium homeostasis and cell wall integrity in this fungal pathogen remains unknown. METHODS Chemical sensitivity was tested by dilution assay. Cell survival was examined by measuring colony-forming units and staining with Annexin V-FITC and propidium iodide. Calcium signaling was examined by expression of downstream target gene CaUTR2, while cell wall integrity signaling was revealed by detection of phosphorylated Mkc1 and Cek1. Subcellular localization of CaGdt1 was examined through direct and indirect immunofluorescent approaches. Transcriptomic analysis was carried out with RNA sequencing. RESULTS This study shows that Candida albicans CaGDT1 is also a functional ortholog of ScGDT1 in the response of S. cerevisiae to cell wall stress. CaGdt1 is localized in the Golgi apparatus but at distinct sites from CaPmr1 in C. albicans. Loss of CaGDT1 increases the sensitivity of cell lacking CaPMR1 to cell wall and ER stresses. Deletion of CaGDT1 and/or CaPMR1 increases calcium uptake and activates the calcium/calcineurin signaling. Transcriptomic profiling reveals that core functions shared by CaGdt1 and CaPmr1 are involved in the regulation of cellular transport of metal ions and amino acids. However, CaGdt1 has distinct functions from CaPmr1. Chitin synthase gene CHS2 is up regulated in all three mutants, while CHS3 is only up regulated in the pmr1/pmr1 and the gdt1/gdt1 pmr1/pmr1 mutants. Five genes (DIE2, STT3, OST3, PMT1 and PMT4) of glycosylation pathway and one gene (SWI4) of the cell wall integrity (CWI) pathway are upregulated due to deletion of CaGDT1 and/or CaPMR1. Consistently, deletion of either CaPMR1 or CaGDT1 activates the CaCek1-mediated CWI signaling in a cell wall stress-independent fashion. Calcineurin function is required for the integrity of the cell wall and vacuolar compartments of cells lacking both GDT1 and CaPMR1. CONCLUSIONS CaPmr1 is the major player in the regulation of calcium homeostasis and cell wall stress, while CaGdt1 plays a compensatory role for CaPmr1 in the Golgi compartment in C. albicans.
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Affiliation(s)
- Linghuo Jiang
- Laboratory for Yeast Molecular and Cell Biology, School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong, China.
| | - Junjun Wang
- Department of Food Engineering, Weihai Ocean Vocational College, Weihai, Shandong, China
| | - Faiza Asghar
- Laboratory for Yeast Molecular and Cell Biology, School of Agricultural Engineering and Food Science, Shandong University of Technology, Zibo, Shandong, China
| | - Nathan Snyder
- Department of Biology, the Johns Hopkins University, Baltimore, MD, USA
| | - Kyle W Cunningham
- Department of Biology, the Johns Hopkins University, Baltimore, MD, USA
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Zhang Q, Huang L, Zhang C, Xie P, Zhang Y, Ding S, Xu F. Synthesis and biological activity of polyprenols. Fitoterapia 2015; 106:184-93. [PMID: 26358482 DOI: 10.1016/j.fitote.2015.09.008] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 09/02/2015] [Accepted: 09/04/2015] [Indexed: 11/26/2022]
Abstract
The polyprenols and their derivatives are highlighted in this study. These lipid linear polymers of isoprenoid residues are widespread in nature from bacteria to human cells. This review primarily presents the synthesis and biological activities of polyprenyl derivatives. Attention is focused on the synthesis and biological activity of dolichols, polyprenyl ester derivatives and polyprenyl amines. Other polyprenyl derivatives, such as oxides of polyprenols, aromatic polyprenols, polyprenyl bromide and polyprenyl sulphates, are mentioned. It is noted that polyprenyl phosphates and polyprenyl-linked glycosylation have better antibacterial, gene therapy and immunomodulating performance, whereas polyprenyl amines have better for antibacterial and antithrombotic activity. Dolichols, polyprenyl acetic esters, polyprenyl phosphates and polyprenyl-linked glycosylation have pharmacological anti-tumour effects. Finally, the postulated prospect of polyprenols and their derivatives are discussed. Further in vivo studies on the above derivatives are needed. The compatibility of polyprenols and their derivatives with other drugs should be studied, and new preparations of polyprenyl derivatives, such as hydrogel glue and release-controlled drugs, are suggested for future research and development.
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Affiliation(s)
- Qiong Zhang
- Institute of Chemical Industry of Forest Products, CAF, Nanjing, Jiangsu Province 210042, China; National Engineering Lab. for Biomass Chemical Utilization, Key and Open lab. of Forest Chemical Engineering, SFA, Nanjing, Jiangsu Province 210042, China; Key Lab. of Biomass Energy and Material, Nanjing, Jiangsu Province 210042, China; Beijing Forestry University, Beijing 100083, China
| | - Lixin Huang
- Institute of Chemical Industry of Forest Products, CAF, Nanjing, Jiangsu Province 210042, China; National Engineering Lab. for Biomass Chemical Utilization, Key and Open lab. of Forest Chemical Engineering, SFA, Nanjing, Jiangsu Province 210042, China; Key Lab. of Biomass Energy and Material, Nanjing, Jiangsu Province 210042, China.
| | - Caihong Zhang
- Institute of Chemical Industry of Forest Products, CAF, Nanjing, Jiangsu Province 210042, China; National Engineering Lab. for Biomass Chemical Utilization, Key and Open lab. of Forest Chemical Engineering, SFA, Nanjing, Jiangsu Province 210042, China; Key Lab. of Biomass Energy and Material, Nanjing, Jiangsu Province 210042, China
| | - Pujun Xie
- Institute of Chemical Industry of Forest Products, CAF, Nanjing, Jiangsu Province 210042, China; National Engineering Lab. for Biomass Chemical Utilization, Key and Open lab. of Forest Chemical Engineering, SFA, Nanjing, Jiangsu Province 210042, China; Key Lab. of Biomass Energy and Material, Nanjing, Jiangsu Province 210042, China
| | - Yaolei Zhang
- Institute of Chemical Industry of Forest Products, CAF, Nanjing, Jiangsu Province 210042, China; National Engineering Lab. for Biomass Chemical Utilization, Key and Open lab. of Forest Chemical Engineering, SFA, Nanjing, Jiangsu Province 210042, China; Key Lab. of Biomass Energy and Material, Nanjing, Jiangsu Province 210042, China
| | - Shasha Ding
- Institute of Chemical Industry of Forest Products, CAF, Nanjing, Jiangsu Province 210042, China; National Engineering Lab. for Biomass Chemical Utilization, Key and Open lab. of Forest Chemical Engineering, SFA, Nanjing, Jiangsu Province 210042, China; Key Lab. of Biomass Energy and Material, Nanjing, Jiangsu Province 210042, China
| | - Feng Xu
- Beijing Forestry University, Beijing 100083, China
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14
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Vestrheim AC, Moen A, Egge-Jacobsen W, Reubsaet L, Halvorsen TG, Bratlie DB, Paulsen BS, Michaelsen TE. A pilot study showing differences in glycosylation patterns of IgG subclasses induced by pneumococcal, meningococcal, and two types of influenza vaccines. Immun Inflamm Dis 2014; 2:76-91. [PMID: 25400928 PMCID: PMC4217548 DOI: 10.1002/iid3.22] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Revised: 03/02/2014] [Accepted: 04/08/2014] [Indexed: 12/13/2022] Open
Abstract
The presence of a carbohydrate moiety on asparagine 297 in the Fc part of an IgG molecule is essential for its effector functions and thus influences its vaccine protective effect. Detailed structural carbohydrate analysis of vaccine induced IgGs is therefore of interest as this knowledge can prove valuable in vaccine research and design and when optimizing vaccine schedules. In order to better understand and exploit the protective potential of IgG antibodies, we carried out a pilot study; collecting serum or plasma from volunteers receiving different vaccines and determining the IgG subclass glycosylation patterns against specific vaccine antigens at different time points using LC-ESI-MS analysis. The four vaccines included a pneumococcal capsule polysaccharide vaccine, a meningococcal outer membrane vesicle vaccine, a seasonal influenza vaccine, and a pandemic influenza vaccine. The number of volunteers was limited, but the results following immunization indicated that the IgG subclass which dominated the response showed increased galactose and the level of sialic acid increased with time for most vaccinees. Fucose levels increased for some vaccinees but in general stayed relatively unaltered. The total background IgG glycosylation analyzed in parallel varied little with time and hence the changes seen were likely to be caused by vaccination. The presence of an adjuvant in the pandemic influenza vaccine seemed to produce simpler and less varied glycoforms compared to the adjuvant-free seasonal influenza vaccine. This pilot study demonstrates that detailed IgG glycosylation pattern analysis might be a necessary step in addition to biological testing for optimizing vaccine development and strategies.
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Affiliation(s)
- Anne Cathrine Vestrheim
- Department of Bacteriology & Immunology, Norwegian Institute of Public HealthOslo, Norway
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of OsloOslo, Norway
| | - Anders Moen
- Department of Molecular Biosciences, University of OsloOslo, Norway
| | | | - Leon Reubsaet
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of OsloOslo, Norway
| | | | - Diane Bryant Bratlie
- Department of Bacteriology & Immunology, Norwegian Institute of Public HealthOslo, Norway
| | - Berit Smestad Paulsen
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of OsloOslo, Norway
| | - Terje Einar Michaelsen
- Department of Bacteriology & Immunology, Norwegian Institute of Public HealthOslo, Norway
- Department of Pharmaceutical Chemistry, School of Pharmacy, University of OsloOslo, Norway
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15
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Murlasits Z, Radák Z. The Effects of Statin Medications on Aerobic Exercise Capacity and Training Adaptations. Sports Med 2014; 44:1519-30. [DOI: 10.1007/s40279-014-0224-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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16
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Surmacz L, Plochocka D, Kania M, Danikiewicz W, Swiezewska E. cis-Prenyltransferase atCPT6 produces a family of very short-chain polyisoprenoids in planta. Biochim Biophys Acta Mol Cell Biol Lipids 2014; 1841:240-50. [PMID: 24291644 DOI: 10.1016/j.bbalip.2013.11.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2013] [Revised: 11/13/2013] [Accepted: 11/22/2013] [Indexed: 11/28/2022]
Abstract
cis-Prenyltransferases (CPTs) comprise numerous enzymes synthesizing isoprenoid hydrocarbon skeleton with isoprenoid units in the cis (Z) configuration. The chain-length specificity of a particular plant CPT is in most cases unknown despite thecomposition of the accumulated isoprenoids in the tissue of interest being well established. In this report AtCPT6, one of the nine Arabidopsis thaliana CPTs, is shown to catalyze the synthesis of a family of very short-chain polyisoprenoid alcohols of six, seven, and eight isoprenoid units, those of seven units dominating The product specificity of AtCPT6 was established in vivo following its expression in the heterologous system of the yeast Saccharomyces cerevisiae and was confirmed by the absence of specific products in AtCPT6 T-DNA insertion mutants and their overaccumulation in AtCPT6-overexpressing plants. These observations are additionally validated in silico using an AtCPT6 model obtained by homology modeling. AtCPT6 only partially complements the function of the yeast homologue of CPT-Rer2 since it restores the growth but not protein glycosylation in rer2delta yeast.This is the first in planta characterization of specific products of a plant CPT producing polyisoprenoids. Their distribution suggests that a joint activity of several CPTs is required to produce the complex mixture of polyisoprenoid alcohols found in Arabidopsis roots.
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Manat G, Roure S, Auger R, Bouhss A, Barreteau H, Mengin-Lecreulx D, Touzé T. Deciphering the metabolism of undecaprenyl-phosphate: the bacterial cell-wall unit carrier at the membrane frontier. Microb Drug Resist 2014; 20:199-214. [PMID: 24799078 DOI: 10.1089/mdr.2014.0035] [Citation(s) in RCA: 94] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
During the biogenesis of bacterial cell-wall polysaccharides, such as peptidoglycan, cytoplasmic synthesized precursors should be trafficked across the plasma membrane. This essential process requires a dedicated lipid, undecaprenyl-phosphate that is used as a glycan lipid carrier. The sugar is linked to the lipid carrier at the inner face of the membrane and is translocated toward the periplasm, where the glycan moiety is transferred to the growing polymer. Undecaprenyl-phosphate originates from the dephosphorylation of its precursor undecaprenyl-diphosphate, with itself generated by de novo synthesis or by recycling after the final glycan transfer. Undecaprenyl-diphosphate is de novo synthesized by the cytosolic cis-prenyltransferase undecaprenyl-diphosphate synthase, which has been structurally and mechanistically characterized in great detail highlighting the condensation process. In contrast, the next step toward the formation of the lipid carrier, the dephosphorylation step, which has been overlooked for many years, has only started revealing surprising features. In contrast to the previous step, two unrelated families of integral membrane proteins exhibit undecaprenyl-diphosphate phosphatase activity: BacA and members of the phosphatidic acid phosphatase type 2 super-family, raising the question of the significance of this multiplicity. Moreover, these enzymes establish an unexpected link between the synthesis of bacterial cell-wall polymers and other biological processes. In the present review, the current knowledge in the field of the bacterial lipid carrier, its mechanism of action, biogenesis, recycling, regulation, and future perspective works are presented.
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Affiliation(s)
- Guillaume Manat
- Laboratoire des Enveloppes Bactériennes et Antibiotiques, IBBMC, UMR 8619 CNRS, Université Paris Sud , Orsay Cedex, France
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Wu B, Woodward R, Wen L, Wang X, Zhao G, Wang PG. Synthesis of a Comprehensive Polyprenol Library for Evaluation of Bacterial Enzyme Lipid Substrate Specificity. European J Org Chem 2013; 2013:8162-8173. [PMID: 24511260 DOI: 10.1002/ejoc.201301089] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Polyprenols, a type of universal glycan lipid carrier, play important roles for glycan bio-assembly in wide variety of living systems. Chemical synthesis of natural polyisoprenols such as undecaprenol and dolichols, but especially their homologs, could serves as a powerful molecular tool to dissect and define the functions of enzymes involved in glycan biosynthesis. In this paper, we report an efficient and reliable method to construct this type of hydrophoic molecule through a base-mediated iterative coupling approach using a key bifunctional (Z, Z)-diisoprenyl building block. The ligation with N-acetyl-D-glactosamine (GalNAc) with a set of the synthesized lipid analogs forming polyprenol pyrophosphate linked GalNAc (GalNAc-PP-lipid) conjugates is also demonstrated.
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Affiliation(s)
- Baolin Wu
- The Center for Therapeutics and Diagnostics (CDT), Department of Chemistry, Georgia State University, Atlanta, GA 30303, USA, , Homepage: http://chemistry.gsu.edu/faculty/PWang/
| | - Robert Woodward
- Department of Chemistry and Biochemistry, University of Mount Union, Alliance, OH 44601, USA
| | - Liuqing Wen
- The Center for Therapeutics and Diagnostics (CDT), Department of Chemistry, Georgia State University, Atlanta, GA 30303, USA, , Homepage: http://chemistry.gsu.edu/faculty/PWang/
| | - Xuan Wang
- The Center for Therapeutics and Diagnostics (CDT), Department of Chemistry, Georgia State University, Atlanta, GA 30303, USA, , Homepage: http://chemistry.gsu.edu/faculty/PWang/
| | - Guohui Zhao
- The Center for Therapeutics and Diagnostics (CDT), Department of Chemistry, Georgia State University, Atlanta, GA 30303, USA, , Homepage: http://chemistry.gsu.edu/faculty/PWang/
| | - Peng George Wang
- The Center for Therapeutics and Diagnostics (CDT), Department of Chemistry, Georgia State University, Atlanta, GA 30303, USA, , Homepage: http://chemistry.gsu.edu/faculty/PWang/
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Bickford JS, Nick HS. Conservation of the PTEN catalytic motif in the bacterial undecaprenyl pyrophosphate phosphatase, BacA/UppP. MICROBIOLOGY-SGM 2013; 159:2444-2455. [PMID: 24068241 DOI: 10.1099/mic.0.070474-0] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Isoprenoid lipid carriers are essential in protein glycosylation and bacterial cell envelope biosynthesis. The enzymes involved in their metabolism (synthases, kinases and phosphatases) are therefore critical to cell viability. In this review, we focus on two broad groups of isoprenoid pyrophosphate phosphatases. One group, containing phosphatidic acid phosphatase motifs, includes the eukaryotic dolichyl pyrophosphate phosphatases and proposed recycling bacterial undecaprenol pyrophosphate phosphatases, PgpB, YbjB and YeiU/LpxT. The second group comprises the bacterial undecaprenol pyrophosphate phosphatase, BacA/UppP, responsible for initial formation of undecaprenyl phosphate, which we predict contains a tyrosine phosphate phosphatase motif resembling that of the tumour suppressor, phosphatase and tensin homologue (PTEN). Based on protein sequence alignments across species and 2D structure predictions, we propose catalytic and lipid recognition motifs unique to BacA/UppP enzymes. The verification of our proposed active-site residues would provide new strategies for the development of substrate-specific inhibitors which mimic both the lipid and pyrophosphate moieties, leading to the development of novel antimicrobial agents.
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Affiliation(s)
- Justin S Bickford
- Department of Neuroscience, University of Florida, Gainesville, FL 32610, USA
| | - Harry S Nick
- Department of Neuroscience, University of Florida, Gainesville, FL 32610, USA
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Aebi M. N-linked protein glycosylation in the ER. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2013; 1833:2430-7. [PMID: 23583305 DOI: 10.1016/j.bbamcr.2013.04.001] [Citation(s) in RCA: 484] [Impact Index Per Article: 44.0] [Reference Citation Analysis] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Revised: 03/25/2013] [Accepted: 04/01/2013] [Indexed: 01/18/2023]
Abstract
N-linked protein glycosylation in the endoplasmic reticulum (ER) is a conserved two phase process in eukaryotic cells. It involves the assembly of an oligosaccharide on a lipid carrier, dolichylpyrophosphate and the transfer of the oligosaccharide to selected asparagine residues of polypeptides that have entered the lumen of the ER. The assembly of the oligosaccharide (LLO) takes place at the ER membrane and requires the activity of several specific glycosyltransferases. The biosynthesis of the LLO initiates at the cytoplasmic side of the ER membrane and terminates in the lumen where oligosaccharyltransferase (OST) selects N-X-S/T sequons of polypeptide and generates the N-glycosidic linkage between the side chain amide of asparagine and the oligosaccharide. The N-glycosylation pathway in the ER modifies a multitude of proteins at one or more asparagine residues with a unique carbohydrate structure that is used as a signalling molecule in their folding pathway. In a later stage of glycoprotein processing, the same systemic modification is used in the Golgi compartment, but in this process, remodelling of the N-linked glycans in a protein-, cell-type and species specific manner generates the high structural diversity of N-linked glycans observed in eukaryotic organisms. This article summarizes the current knowledge of the N-glycosylation pathway in the ER that results in the covalent attachment of an oligosaccharide to asparagine residues of polypeptide chains and focuses on the model organism Saccharomyces cerevisiae. This article is part of a Special Issue entitled: Functional and structural diversity of endoplasmic reticulum.
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Affiliation(s)
- Markus Aebi
- Department of Biology, Institute of Microbiology, Zurich, Switzerland.
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