1
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Daenzer JMI, Druss JJ, Fridovich-Keil JL. Restoring galactose metabolism without restoring GALT rescues both compromised survival in larvae and an adult climbing deficit in a GALT-null D. Melanogaster model of classic galactosemia. J Inherit Metab Dis 2024. [PMID: 38960603 DOI: 10.1002/jimd.12774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/16/2024] [Revised: 06/03/2024] [Accepted: 06/19/2024] [Indexed: 07/05/2024]
Abstract
Classic galactosemia (CG) is an autosomal recessive disorder that results from profound deficiency of galactose-1-phosphate uridylyltransferase (GALT), the middle enzyme in the highly conserved Leloir pathway of galactose metabolism. That galactose metabolism is disrupted in patients with CG, and in GALT-null microbial, cell culture, and animal models of CG, has been known for many years. However, whether the long-term developmental complications of CG result from disrupted galactose metabolism alone, or from loss of some independent moonlighting function of GALT, in addition to disrupted galactose metabolism, has been posed but never resolved. Here, we addressed this question using a GALT-null Drosophila melanogaster model of CG engineered to express uridine diphosphate (UDP)-glucose/galactose pyrophosphorylase (UGGP), a plant enzyme that effectively bypasses GALT in the Leloir pathway by converting substrates uridine triphosphate (UTP) plus galactose-1-phosphate (gal-1P) into products UDP-galactose plus pyrophosphate (PPi). While GALT and UGGP share one substrate (gal-1P) and one product (UDP-galactose), they are structurally and evolutionarily unrelated enzymes. It is therefore extremely unlikely that they would also share a moonlighting function. We found that GALT-null flies expressing UGGP showed not only partial rescue of metabolic abnormalities and acute larval sensitivity to dietary galactose, as expected, but also full rescue of an adult motor deficit otherwise seen in this model. By extension, these results may offer insights to the underlying bases of at least some acute and long-term complications experienced by patients with CG.
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Affiliation(s)
- Jennifer M I Daenzer
- Department of Human Genetics, Emory University School of Medicine, Atlanta, Georgia, USA
| | - Jared J Druss
- Department of Human Genetics, Emory University School of Medicine, Atlanta, Georgia, USA
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2
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Li Z, Zhong S, Huang Q, Zhang Y, Xu T, Shi W, Guo D, Zeng Z. The mechanism of Andrena camellia in digesting toxic sugars. iScience 2024; 27:109847. [PMID: 38840840 PMCID: PMC11152697 DOI: 10.1016/j.isci.2024.109847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2024] [Revised: 04/10/2024] [Accepted: 04/25/2024] [Indexed: 06/07/2024] Open
Abstract
Camellia oleifera is an economically and medicinally valuable oilseed crop. Honeybee, the most abundant pollinator, rarely visits C. oleifera because of the toxic sugars in the nectar and pollen. These toxic sugars cannot be fully digested by honeybees and inhibit the process of synthesizing trehalose in honeybees. C. oleifera exhibits self-incompatibility, and its pollination heavily depends on Andrena camellia. However, the mechanism by which A. camellia digests toxic sugars in C. oleifera nectar and pollen remains unknown. Consequently, we identified and validated four single-copy genes (α-N-acetyl galactosamine-like, galactokinase, galactose-1-phosphate uridyltransferase, and UDP-galactose-4'-epimerase, abbreviated as NAGA-like, GALK, GALT, and GALE) essential for detoxifying toxic sugars in vitro. Then, we cloned the four genes into Escherichia coli, and expressed enzyme successfully degraded the toxic sugars. The phylogeny suggests that the genes were conserved and functionally diverged among the evolution. These results provide novel insights into pollinator detoxification during co-evolution.
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Affiliation(s)
- Zhen Li
- Honeybee Research Institute, Jiangxi Agricultural University, Nanchang 330045, China
- Jiangxi Province Key Laboratory of Honeybee Biology and Beekeeping, Nanchang 330045, China
- College of Life Science and Resources and Environment, Yichun University, Yichun 336000, China
| | - Shiqing Zhong
- Honeybee Research Institute, Jiangxi Agricultural University, Nanchang 330045, China
- Jiangxi Province Key Laboratory of Honeybee Biology and Beekeeping, Nanchang 330045, China
| | - Qiang Huang
- Honeybee Research Institute, Jiangxi Agricultural University, Nanchang 330045, China
- Jiangxi Province Key Laboratory of Honeybee Biology and Beekeeping, Nanchang 330045, China
| | - Yong Zhang
- Honeybee Research Institute, Jiangxi Agricultural University, Nanchang 330045, China
- Jiujiang University, Jiujiang 332005, China
| | - Tianyu Xu
- Honeybee Research Institute, Jiangxi Agricultural University, Nanchang 330045, China
- Jiangxi Province Key Laboratory of Honeybee Biology and Beekeeping, Nanchang 330045, China
| | - Wenkai Shi
- Honeybee Research Institute, Jiangxi Agricultural University, Nanchang 330045, China
- Jiangxi Province Key Laboratory of Honeybee Biology and Beekeeping, Nanchang 330045, China
| | - Dongsheng Guo
- College of Life Science and Resources and Environment, Yichun University, Yichun 336000, China
| | - Zhijiang Zeng
- Honeybee Research Institute, Jiangxi Agricultural University, Nanchang 330045, China
- Jiangxi Province Key Laboratory of Honeybee Biology and Beekeeping, Nanchang 330045, China
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3
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Sakizli U, Takano T, Yoo SK. GALDAR: A genetically encoded galactose sensor for visualizing sugar metabolism in vivo. PLoS Biol 2024; 22:e3002549. [PMID: 38502638 PMCID: PMC10950222 DOI: 10.1371/journal.pbio.3002549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2023] [Accepted: 02/14/2024] [Indexed: 03/21/2024] Open
Abstract
Sugar metabolism plays a pivotal role in sustaining life. Its dynamics within organisms is less understood compared to its intracellular metabolism. Galactose, a hexose stereoisomer of glucose, is a monosaccharide transported via the same transporters with glucose. Galactose feeds into glycolysis and regulates protein glycosylation. Defects in galactose metabolism are lethal for animals. Here, by transgenically implementing the yeast galactose sensing system into Drosophila, we developed a genetically encoded sensor, GALDAR, which detects galactose in vivo. Using this heterologous system, we revealed dynamics of galactose metabolism in various tissues. Notably, we discovered that intestinal stem cells do not uptake detectable levels of galactose or glucose. GALDAR elucidates the role for galactokinase in metabolism of galactose and a transition of galactose metabolism during the larval period. This work provides a new system that enables analyses of in vivo sugar metabolism.
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Affiliation(s)
- Uğurcan Sakizli
- Laboratory for Homeodynamics, RIKEN BDR, Kobe, Japan
- Division of Developmental Biology and Regenerative Medicine, Kobe University, Kobe, Japan
| | - Tomomi Takano
- Laboratory for Homeodynamics, RIKEN BDR, Kobe, Japan
- Physiological Genetics Laboratory, RIKEN CPR, Kobe, Japan
| | - Sa Kan Yoo
- Laboratory for Homeodynamics, RIKEN BDR, Kobe, Japan
- Division of Developmental Biology and Regenerative Medicine, Kobe University, Kobe, Japan
- Physiological Genetics Laboratory, RIKEN CPR, Kobe, Japan
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4
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Mut J, Altmann S, Reising S, Meißner-Weigl J, Driessen MD, Ebert R, Seibel J. SiaNAl can be efficiently incorporated in glycoproteins of human mesenchymal stromal cells by metabolic glycoengineering. ACS Biomater Sci Eng 2024; 10:139-148. [PMID: 36946521 DOI: 10.1021/acsbiomaterials.2c01534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Metabolic glycoengineering involves the stimulation of cells with functionalized monosaccharides. Glucosamine, galactosamine, and mannosamine derivatives are commercially available, but their application may lead to undirected (i.e., chemical) incorporation into proteins. However, sialic acids are attached to the ends of complex sugar chains of glycoproteins, which might be beneficial for cell surface modification via click chemistry. Thus, we studied the incorporation of chemically synthesized unnatural alkyne modified sialic acid (SiaNAl) into glycoproteins of human telomerase-immortalized mesenchymal stromal cells (hMSC-TERT) and we show that SiaNAl can be efficiently incorporated in glycoproteins involved in signal transduction and cell junction.
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Affiliation(s)
- Jürgen Mut
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, Würzburg 97074, Germany
| | - Stephan Altmann
- Department of Musculoskeletal Tissue Regeneration, University of Würzburg, Friedrich-Bergius-Ring 15, Würzburg 97076, Germany
| | - Sabine Reising
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, Würzburg 97074, Germany
| | - Jutta Meißner-Weigl
- Department of Musculoskeletal Tissue Regeneration, University of Würzburg, Friedrich-Bergius-Ring 15, Würzburg 97076, Germany
| | - Marc D Driessen
- Institute for Molecular Medicine, Proteome Research, University Hospital and Medical Faculty, Heinrich-Heine-University Düsseldorf, Düsseldorf 40225, Germany
| | - Regina Ebert
- Department of Musculoskeletal Tissue Regeneration, University of Würzburg, Friedrich-Bergius-Ring 15, Würzburg 97076, Germany
| | - Jürgen Seibel
- Institute of Organic Chemistry, University of Würzburg, Am Hubland, Würzburg 97074, Germany
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5
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Wang Y, Perepelov AV, Senchenkova SN, Lu G, Wang X, Ma G, Yang Q, Yuan J, Wang Y, Xie L, Jiang X, Qin J, Liu D, Liu M, Huang D, Liu B. Glycoengineering directs de novo biomanufacturing of UPEC O21 O-antigen polysaccharide based glycoprotein. Int J Biol Macromol 2023; 253:126993. [PMID: 37739281 DOI: 10.1016/j.ijbiomac.2023.126993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 09/06/2023] [Accepted: 09/17/2023] [Indexed: 09/24/2023]
Abstract
Glycoproteins, in which polysaccharides are usually attached to proteins, are an important class of biomolecules that are widely used as therapeutic agents in clinical treatments for decades. Uropathogenic Escherichia coli (UPEC) O21 has been identified as a serogroup that induces urinary tract infections, with a global increasing number among women and young children. Therefore, there is an urgent need to establish protective vaccines against UPEC infection. Herein, we engineered non-pathogenic E. coli MG1655 to achieve robust, cost-effective de novo biosynthesis of O21 O-antigen polysaccharide-based glycoprotein against UPEC O21. Specifically, this glycoengineered E. coli MG1655 was manipulated for high-efficient glucose-glycerol co-utilization and for the gene cluster installation and O-glycosylation machinery assembly. The key pathways of UDP-sugar precursors were also strengthened to enforce more carbon flux towards the glycosyl donors, which enhanced the glycoprotein titer by 5.6-fold. Further optimization of culture conditions yielded glycoproteins of up to 35.34 mg/L. Glycopeptide MS confirmed the preciset biosynthesis of glycoprotein. This glycoprotein elicited antigen-specific IgG immune responses and significantly reduced kidney and bladder colonization. This bacterial cell-based glyco-platform and optimized strategies can provide a guideline for the biosynthesis of other value-added glycoproteins.
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Affiliation(s)
- Yuhui Wang
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China; National Glycoengineering Research Center, Shandong University, Qingdao, Shandong 266237, China
| | - Andrei V Perepelov
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russian Federation
| | - Sof'ya N Senchenkova
- N. D. Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, 119991 Moscow, Russian Federation
| | - Gege Lu
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China
| | - Xiaohan Wang
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China
| | - Guozhen Ma
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China
| | - Qian Yang
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China
| | - Jian Yuan
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China
| | - Yanling Wang
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China
| | - Lijie Xie
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China
| | - Xiaolong Jiang
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China
| | - Jingliang Qin
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China
| | - Dan Liu
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China
| | - Miaomiao Liu
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China
| | - Di Huang
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China.
| | - Bin Liu
- Key Laboratory of Molecular Microbiology and Technology, Ministry of Education, Nankai University, Tianjin, China; TEDA Institute of Biological Sciences and Biotechnology, Tianjin Key Laboratory of Microbial Functional Genomics, Nankai University, Tianjin, China.
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6
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Mao L, Schneider JW, Robinson AS. Use of single analytic tool to quantify both absolute N-glycosylation and glycan distribution in monoclonal antibodies. Biotechnol Prog 2023; 39:e3365. [PMID: 37221987 DOI: 10.1002/btpr.3365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 04/22/2023] [Accepted: 05/11/2023] [Indexed: 05/25/2023]
Abstract
Recombinant proteins represent almost half of the top selling therapeutics-with over a hundred billion dollars in global sales-and their efficacy and safety strongly depend on glycosylation. In this study, we showcase a simple method to simultaneously analyze N-glycan micro- and macroheterogeneity of an immunoglobulin G (IgG) by quantifying glycan occupancy and distribution. Our approach is linear over a wide range of glycan and glycoprotein concentrations down to 25 ng/mL. Additionally, we present a case study demonstrating the effect of small molecule metabolic regulators on glycan heterogeneity using this approach. In particular, sodium oxamate (SOD) decreased Chinese hamster ovary (CHO) glucose metabolism and reduced IgG glycosylation by 40% through upregulating reactive oxygen species (ROS) and reducing the UDP-GlcNAc pool, while maintaining a similar glycan profile to control cultures. Here, we suggest glycan macroheterogeneity as an attribute should be included in bioprocess screening to identify process parameters that optimize culture performance without compromising antibody quality.
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Affiliation(s)
- Leran Mao
- Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
| | - James W Schneider
- Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
| | - Anne S Robinson
- Department of Chemical Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania, USA
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7
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Nagode A, Vanbeselaere J, Dutkiewicz Z, Kaltenbrunner S, Wilson IBH, Duchêne M. Molecular characterisation of Entamoeba histolytica UDP-glucose 4-epimerase, an enzyme able to provide building blocks for cyst wall formation. PLoS Negl Trop Dis 2023; 17:e0011574. [PMID: 37616327 PMCID: PMC10482301 DOI: 10.1371/journal.pntd.0011574] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 09/06/2023] [Accepted: 08/06/2023] [Indexed: 08/26/2023] Open
Abstract
In the human host, the protozoan parasite Entamoeba histolytica is adapted to a non-invasive lifestyle in the colon as well as to an invasive lifestyle in the mesenterial blood vessels and the liver. This means to cope with bacteria and human cells as well as various metabolic challenges. Galactose and N-acetylgalactosamine (GalNAc) are sugars of great importance for the amoebae, they attach to the host mucus and enterocytes via their well-studied Gal/GalNAc specific lectin, they carry galactose residues in their surface glycans, and they cleave GalNAc from host mucins. The enzyme UDP-glucose 4-epimerase (GalE) works as a bridge between the galactose and glucose worlds, it can help to generate glucose for glycolysis from phagocytosis products containing galactose as well as providing UDP-galactose necessary for the biosynthesis of galactose-containing surface components. E. histolytica contains a single galE gene. We recombinantly expressed the enzyme in Escherichia coli and used a spectrophotometric assay to determine its temperature and pH dependency (37°C, pH 8.5), its kinetics for UDP-glucose (Km = 31.82 μM, Vmax = 4.31 U/mg) and substrate spectrum. As observed via RP-HPLC, the enzyme acts on UDP-Glc/Gal as well as UDP-GlcNAc/GalNAc. Previously, Trypanosoma brucei GalE and the bloodstream form of the parasite were shown to be susceptible to the three compounds ebselen, a selenoorganic drug with antioxidant properties, diethylstilbestrol, a mimic of oestrogen with anti-inflammatory properties, and ethacrynic acid, a loop diuretic used to treat oedema. In this study, the three compounds had cytotoxic activity against E. histolytica, but only ebselen inhibited the recombinant GalE with an IC50 of 1.79 μM (UDP-Gal) and 1.2 μM (UDP-GalNAc), suggesting that the two other compounds are active against other targets in the parasite. The importance of the ability of GalE to interconvert UDP-GalNAc and UDP-GlcNAc may be that the trophozoites can generate precursors for their own cyst wall from the sugar subunits cleaved from host mucins. This finding advances our understanding of the biochemical interactions of E. histolytica in its colonic environment.
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Affiliation(s)
- Anna Nagode
- Institute of Specific Prophylaxis and Tropical Medicine, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | | | | | - Samantha Kaltenbrunner
- Institute of Specific Prophylaxis and Tropical Medicine, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
| | - Iain B. H. Wilson
- Department of Chemistry, Universität für Bodenkultur, Vienna, Austria
| | - Michael Duchêne
- Institute of Specific Prophylaxis and Tropical Medicine, Center for Pathophysiology, Infectiology and Immunology, Medical University of Vienna, Vienna, Austria
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8
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Mendoza-Porras O, Broadbent JA, Beale DJ, Escobar-Correas SM, Osborne SA, Simon CJ, Wade NM. Post-prandial response in hepatopancreas and haemolymph of Penaeus monodon fed different diets. Omics insights into glycoconjugate metabolism, energy utilisation, chitin biosynthesis, immune function, and autophagy. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY PART D: GENOMICS AND PROTEOMICS 2023; 46:101073. [PMID: 37018937 DOI: 10.1016/j.cbd.2023.101073] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 02/28/2023] [Accepted: 03/12/2023] [Indexed: 03/30/2023]
Abstract
Raw materials or bioactive ingredients trigger mechanisms to assimilate nutrients and activate metabolic pathways that promote growth, immune function, or energy storage. Our understanding of these processes at a molecular level remains limited in aquaculture, especially in shrimp. Here, hepatopancreas proteomics and haemolymph metabolomics were used to investigate the post-prandial response of black tiger shrimps (Penaeus monodon) fed a conventional fishmeal diet (FM); a diet supplemented with the microbial biomass Novacq™ (NV); krill meal (KM); or, fasted (FS). Using FM as a control, a 2-fold change in abundance threshold was implemented to determine the significance of proteins and metabolites. NV fed shrimp showed preference for energy derived from carbohydrates indicated by a strong signature of glycoconjugate metabolism and activation of the amino- and nucleotide sugar metabolic pathway. KM activated the glyoxylate and dicarboxylate pathway that denoted shrimp preference for lipidic energy. KM also influenced energy generation by the TCA cycle inferred from higher abundance of the metabolites succinic semialdehyde, citric acid, isocitrate, alpha ketoglutarate and ATP and downregulation of the enzyme isocitrate dehydrogenase that catalyses oxidative decarboxylation of isocitrate. FS shrimp displayed down-regulation of oxidative phosphorylation and resorted to internal lipid reserves for energy homeostasis displaying a strong signature of autophagy. Pyrimidine metabolism was the preferred energy strategy in this group. Our study also provided evidence that during fasting or consumption of specific ingredients, shrimp share common pathways to meet their energy requirements, however, the intensity at which these pathways were impacted was diet dependent.
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Affiliation(s)
- Omar Mendoza-Porras
- CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, QLD, Australia.
| | - James A Broadbent
- CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, QLD, Australia
| | - David J Beale
- CSIRO Land and Water, Ecosciences Precinct, Dutton Park, QLD, Australia
| | | | - Simone A Osborne
- CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, QLD, Australia
| | - Cedric J Simon
- CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, QLD, Australia
| | - Nicholas M Wade
- CSIRO Agriculture and Food, Queensland Bioscience Precinct, St Lucia, QLD, Australia
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9
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Saeui CT, Shah SR, Fernandez-Gil BI, Zhang C, Agatemor C, Dammen-Brower K, Mathew MP, Buettner M, Gowda P, Khare P, Otamendi-Lopez A, Yang S, Zhang H, Le A, Quinoñes-Hinojosa A, Yarema KJ. Anticancer Properties of Hexosamine Analogs Designed to Attenuate Metabolic Flux through the Hexosamine Biosynthetic Pathway. ACS Chem Biol 2023; 18:151-165. [PMID: 36626752 DOI: 10.1021/acschembio.2c00784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Altered cellular metabolism is a hallmark of cancer pathogenesis and progression; for example, a near-universal feature of cancer is increased metabolic flux through the hexosamine biosynthetic pathway (HBP). This pathway produces uridine diphosphate N-acetylglucosamine (UDP-GlcNAc), a potent oncometabolite that drives multiple facets of cancer progression. In this study, we synthesized and evaluated peracetylated hexosamine analogs designed to reduce flux through the HBP. By screening a panel of analogs in pancreatic cancer and glioblastoma multiform (GBM) cells, we identified Ac4Glc2Bz─a benzyl-modified GlcNAc mimetic─as an antiproliferative cancer drug candidate that down-regulated oncogenic metabolites and reduced GBM cell motility at concentrations non-toxic to non-neoplastic cells. More specifically, the growth inhibitory effects of Ac4Glc2Bz were linked to reduced levels of UDP-GlcNAc and concomitant decreases in protein O-GlcNAc modification in both pancreatic cancer and GBM cells. Targeted metabolomics analysis in GBM cells showed that Ac4Glc2Bz disturbed glucose metabolism, amino acid pools, and nucleotide precursor biosynthesis, consistent with reduced proliferation and other anti-oncogenic properties of this analog. Furthermore, Ac4Glc2Bz reduced the invasion, migration, and stemness of GBM cells. Importantly, normal metabolic functions mediated by UDP-GlcNAc were not disrupted in non-neoplastic cells, including maintenance of endogenous levels of O-GlcNAcylation with no global disruption of N-glycan production. Finally, a pilot in vivo study showed that a potential therapeutic window exists where animals tolerated 5- to 10-fold higher levels of Ac4Glc2Bz than projected for in vivo efficacy. Together, these results establish GlcNAc analogs targeting the HBP through salvage mechanisms as a new therapeutic approach to safely normalize an important facet of aberrant glucose metabolism associated with cancer.
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Affiliation(s)
- Christopher T Saeui
- Department of Biomedical Engineering and The Translational Tissue Engineering Center, The Johns Hopkins University and Johns Hopkins School of Medicine, Baltimore, Maryland 21231, United States
| | - Sagar R Shah
- Department of Biomedical Engineering and The Translational Tissue Engineering Center, The Johns Hopkins University and Johns Hopkins School of Medicine, Baltimore, Maryland 21231, United States
| | | | - Cissy Zhang
- Department of Oncology, Johns Hopkins School of Medicine, Baltimore, Maryland 21205, United States.,Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, Baltimore, Maryland 21205, United States
| | - Christian Agatemor
- Department of Biomedical Engineering and The Translational Tissue Engineering Center, The Johns Hopkins University and Johns Hopkins School of Medicine, Baltimore, Maryland 21231, United States
| | - Kris Dammen-Brower
- Department of Biomedical Engineering and The Translational Tissue Engineering Center, The Johns Hopkins University and Johns Hopkins School of Medicine, Baltimore, Maryland 21231, United States
| | - Mohit P Mathew
- Department of Biomedical Engineering and The Translational Tissue Engineering Center, The Johns Hopkins University and Johns Hopkins School of Medicine, Baltimore, Maryland 21231, United States
| | - Matthew Buettner
- Department of Biomedical Engineering and The Translational Tissue Engineering Center, The Johns Hopkins University and Johns Hopkins School of Medicine, Baltimore, Maryland 21231, United States
| | - Prateek Gowda
- Department of Biomedical Engineering and The Translational Tissue Engineering Center, The Johns Hopkins University and Johns Hopkins School of Medicine, Baltimore, Maryland 21231, United States
| | - Pratik Khare
- Department of Oncology, Johns Hopkins School of Medicine, Baltimore, Maryland 21205, United States.,Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, Baltimore, Maryland 21205, United States
| | | | - Shuang Yang
- Department of Pathology, Johns Hopkins School of Medicine, Baltimore, Maryland 21287, United States
| | - Hui Zhang
- Department of Pathology, Johns Hopkins School of Medicine, Baltimore, Maryland 21287, United States
| | - Anne Le
- Department of Oncology, Johns Hopkins School of Medicine, Baltimore, Maryland 21205, United States.,Department of Chemical and Biomolecular Engineering, The Johns Hopkins University, Baltimore, Maryland 21205, United States
| | | | - Kevin J Yarema
- Department of Biomedical Engineering and The Translational Tissue Engineering Center, The Johns Hopkins University and Johns Hopkins School of Medicine, Baltimore, Maryland 21231, United States
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10
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Wu J, Lei C, Li X, Dong X, Qin K, Hong W, Li J, Zhu Y, Chen X. Chemoproteomic Profiling of O‐GlcNAcylation in
Arabidopsis Thaliana
by Using Metabolic Glycan Labeling. Isr J Chem 2022. [DOI: 10.1002/ijch.202200065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jie Wu
- College of Chemistry and Molecular Engineering Peking University Beijing China
- Peking-Tsinghua Center for Life Sciences Peking University Beijing China
| | - Cong Lei
- College of Chemistry and Molecular Engineering Peking University Beijing China
- Beijing National Laboratory for Molecular Sciences Peking University Beijing China
| | - Xilong Li
- State Key Laboratory of Plant Genomics and National Center for Plant Gene Research, Institute of Genetics and Developmental Biology, Innovation Academy for Seed Design Chinese Academy of Sciences Beijing 100101 China
| | - Xueyang Dong
- College of Chemistry and Molecular Engineering Peking University Beijing China
- Beijing National Laboratory for Molecular Sciences Peking University Beijing China
| | - Ke Qin
- College of Chemistry and Molecular Engineering Peking University Beijing China
- Beijing National Laboratory for Molecular Sciences Peking University Beijing China
| | - Weiyao Hong
- College of Chemistry and Molecular Engineering Peking University Beijing China
- Beijing National Laboratory for Molecular Sciences Peking University Beijing China
| | - Jing Li
- College of Life Sciences Capital Normal University Beijing China
| | - Yuntao Zhu
- School of Life Sciences and Health Engineering Jiangnan University Lihu Avenue 1800 Wuxi Jiangsu 214122 China
| | - Xing Chen
- College of Chemistry and Molecular Engineering Peking University Beijing China
- Peking-Tsinghua Center for Life Sciences Peking University Beijing China
- Beijing National Laboratory for Molecular Sciences Peking University Beijing China
- Synthetic and Functional Biomolecules Center Peking University Beijing China
- Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education Peking University Beijing China
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11
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Althammer M, Regl C, Herburger K, Blöchl C, Voglas E, Huber CG, Tenhaken R. Overexpression of UDP-sugar pyrophosphorylase leads to higher sensitivity towards galactose, providing new insights into the mechanisms of galactose toxicity in plants. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2022; 109:1416-1426. [PMID: 34913539 PMCID: PMC9306886 DOI: 10.1111/tpj.15638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Revised: 12/02/2021] [Accepted: 12/07/2021] [Indexed: 05/04/2023]
Abstract
Galactose toxicity (Gal-Tox) is a widespread phenomenon ranging from Escherichia coli to mammals and plants. In plants, the predominant pathway for the conversion of galactose into UDP-galactose (UDP-Gal) and UDP-glucose is catalyzed by the enzymes galactokinase, UDP-sugar pyrophosphorylase (USP) and UDP-galactose 4-epimerase. Galactose is a major component of cell wall polymers, glycolipids and glycoproteins; therefore, it becomes surprising that exogenous addition of galactose leads to drastic root phenotypes including cessation of primary root growth and induction of lateral root formation. Currently, little is known about galactose-mediated toxicity in plants. In this study, we investigated the role of galactose-containing metabolites like galactose-1-phosphate (Gal-1P) and UDP-Gal in Gal-Tox. Recently published data from mouse models suggest that a reduction of the Gal-1P level via an mRNA-based therapy helps to overcome Gal-Tox. To test this hypothesis in plants, we created Arabidopsis thaliana lines overexpressing USP from Pisum sativum. USP enzyme assays confirmed a threefold higher enzyme activity in the overexpression lines leading to a significant reduction of the Gal-1P level in roots. Interestingly, the overexpression lines are phenotypically more sensitive to the exogenous addition of galactose (0.5 mmol L-1 Gal). Nucleotide sugar analysis via high-performance liquid chromatography-mass spectrometry revealed highly elevated UDP-Gal levels in roots of seedlings grown on 1.5 mmol L-1 galactose versus 1.5 mmol L-1 sucrose. Analysis of plant cell wall glycans by comprehensive microarray polymer profiling showed a high abundance of antibody binding recognizing arabinogalactanproteins and extensins under Gal-feeding conditions, indicating that glycoproteins are a major target for elevated UDP-Gal levels in plants.
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Affiliation(s)
- Martina Althammer
- Department of BiosciencesMolecular Plant PhysiologyUniversity of SalzburgHellbrunnerstr. 34Salzburg5020Austria
| | - Christof Regl
- Department of BiosciencesBioanalytical Research LabsUniversity of SalzburgHellbrunnerstr. 34Salzburg5020Austria
| | - Klaus Herburger
- Department of Plant and Environmental SciencesSection for Plant GlycobiologyUniversity of CopenhagenFrederiksberg1871Denmark
| | - Constantin Blöchl
- Department of BiosciencesBioanalytical Research LabsUniversity of SalzburgHellbrunnerstr. 34Salzburg5020Austria
| | - Elena Voglas
- Department of BiosciencesMolecular Plant PhysiologyUniversity of SalzburgHellbrunnerstr. 34Salzburg5020Austria
| | - Christian G. Huber
- Department of BiosciencesBioanalytical Research LabsUniversity of SalzburgHellbrunnerstr. 34Salzburg5020Austria
| | - Raimund Tenhaken
- Department of BiosciencesMolecular Plant PhysiologyUniversity of SalzburgHellbrunnerstr. 34Salzburg5020Austria
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12
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Alvarez Quispe C, Da Costa M, Beerens K, Desmet T. Exploration of archaeal nucleotide sugar epimerases unveils a new and highly promiscuous GDP-Gal4E subgroup. CURRENT RESEARCH IN BIOTECHNOLOGY 2022. [DOI: 10.1016/j.crbiot.2022.08.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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13
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Gücüm S, Sakson R, Hoffmann M, Grote V, Becker C, Pakari K, Beedgen L, Thiel C, Rapp E, Ruppert T, Thumberger T, Wittbrodt J. A patient-based medaka alg2 mutant as a model for hypo-N-glycosylation. Development 2021; 148:269015. [PMID: 34106226 PMCID: PMC8217707 DOI: 10.1242/dev.199385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2020] [Accepted: 05/04/2021] [Indexed: 11/20/2022]
Abstract
Defects in the evolutionarily conserved protein-glycosylation machinery during embryonic development are often fatal. Consequently, congenital disorders of glycosylation (CDG) in human are rare. We modelled a putative hypomorphic mutation described in an alpha-1,3/1,6-mannosyltransferase (ALG2) index patient (ALG2-CDG) to address the developmental consequences in the teleost medaka (Oryzias latipes). We observed specific, multisystemic, late-onset phenotypes, closely resembling the patient's syndrome, prominently in the facial skeleton and in neuronal tissue. Molecularly, we detected reduced levels of N-glycans in medaka and in the patient's fibroblasts. This hypo-N-glycosylation prominently affected protein abundance. Proteins of the basic glycosylation and glycoprotein-processing machinery were over-represented in a compensatory response, highlighting the regulatory topology of the network. Proteins of the retinal phototransduction machinery, conversely, were massively under-represented in the alg2 model. These deficiencies relate to a specific failure to maintain rod photoreceptors, resulting in retinitis pigmentosa characterized by the progressive loss of these photoreceptors. Our work has explored only the tip of the iceberg of N-glycosylation-sensitive proteins, the function of which specifically impacts on cells, tissues and organs. Taking advantage of the well-described human mutation has allowed the complex interplay of N-glycosylated proteins and their contribution to development and disease to be addressed.
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Affiliation(s)
- Sevinç Gücüm
- COS, Centre for Organismal Studies Heidelberg, Heidelberg University, 69120 Heidelberg, Germany.,HBIGS, Heidelberg Biosciences International Graduate School, Heidelberg University, 69120 Heidelberg, Germany
| | - Roman Sakson
- HBIGS, Heidelberg Biosciences International Graduate School, Heidelberg University, 69120 Heidelberg, Germany.,Core facility for Mass Spectrometry and Proteomics, Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
| | - Marcus Hoffmann
- Max Planck Institute for Dynamics of Complex Technical Systems, 39106 Magdeburg, Germany
| | - Valerian Grote
- Max Planck Institute for Dynamics of Complex Technical Systems, 39106 Magdeburg, Germany
| | - Clara Becker
- COS, Centre for Organismal Studies Heidelberg, Heidelberg University, 69120 Heidelberg, Germany
| | - Kaisa Pakari
- COS, Centre for Organismal Studies Heidelberg, Heidelberg University, 69120 Heidelberg, Germany
| | - Lars Beedgen
- Center for Child and Adolescent Medicine, Department Pediatrics I, Heidelberg University, 69120 Heidelberg, Germany
| | - Christian Thiel
- Center for Child and Adolescent Medicine, Department Pediatrics I, Heidelberg University, 69120 Heidelberg, Germany
| | - Erdmann Rapp
- Max Planck Institute for Dynamics of Complex Technical Systems, 39106 Magdeburg, Germany.,glyXera GmbH, 39120 Magdeburg, Germany
| | - Thomas Ruppert
- Core facility for Mass Spectrometry and Proteomics, Zentrum für Molekulare Biologie der Universität Heidelberg (ZMBH), DKFZ-ZMBH Alliance, 69120 Heidelberg, Germany
| | - Thomas Thumberger
- COS, Centre for Organismal Studies Heidelberg, Heidelberg University, 69120 Heidelberg, Germany
| | - Joachim Wittbrodt
- COS, Centre for Organismal Studies Heidelberg, Heidelberg University, 69120 Heidelberg, Germany
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14
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Trevino CE, Rounds JC, Charen K, Shubeck L, Hipp HS, Spencer JB, Johnston HR, Cutler DJ, Zwick ME, Epstein MP, Murray A, Macpherson JN, Mila M, Rodriguez-Revenga L, Berry-Kravis E, Hall DA, Leehey MA, Liu Y, Welt C, Warren ST, Sherman SL, Jin P, Allen EG. Identifying susceptibility genes for primary ovarian insufficiency on the high-risk genetic background of a fragile X premutation. Fertil Steril 2021; 116:843-854. [PMID: 34016428 PMCID: PMC8494118 DOI: 10.1016/j.fertnstert.2021.04.021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 04/21/2021] [Accepted: 04/21/2021] [Indexed: 01/07/2023]
Abstract
OBJECTIVE To identify modifying genes that explains the risk of fragile X-associated primary ovarian insufficiency (FXPOI). DESIGN Gene-based, case/control association study, followed by a functional screen of highly ranked genes using a Drosophila model. SETTING Participants were recruited from academic and clinical settings. PATIENT(S) Women with a premutation (PM) who experienced FXPOI at the age of 35 years or younger (n = 63) and women with a PM who experienced menopause at the age of 50 years or older (n = 51) provided clinical information and a deoxyribonucleic acid sample for whole genome sequencing. The functional screen was on the basis of Drosophila TRiP lines. INTERVENTION(S) Clinical information and a DNA sample were collected for whole genome sequencing. MAIN OUTCOME MEASURES A polygenic risk score derived from common variants associated with natural age at menopause was calculated and associated with the risk of FXPOI. Genes associated with the risk of FXPOI were identified on the basis of the P-value from gene-based association test and an altered level of fecundity when knocked down in the Drosophila PM model. RESULTS The polygenic risk score on the basis of common variants associated with natural age at menopause explained approximately 8% of the variance in the risk of FXPOI. Further, SUMO1 and KRR1 were identified as possible modifying genes associated with the risk of FXPOI on the basis of an untargeted gene analysis of rare variants. CONCLUSIONS In addition to the large genetic effect of a PM on ovarian function, the additive effects of common variants associated with natural age at menopause and the effect of rare modifying variants appear to play a role in FXPOI risk.
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Affiliation(s)
| | | | - Krista Charen
- Department of Human Genetics, Emory University, Atlanta, Georgia
| | - Lisa Shubeck
- Department of Human Genetics, Emory University, Atlanta, Georgia
| | - Heather S Hipp
- Department of Gynecology and Obstetrics, Emory University, Atlanta, Georgia
| | - Jessica B Spencer
- Department of Gynecology and Obstetrics, Emory University, Atlanta, Georgia
| | | | - Dave J Cutler
- Department of Human Genetics, Emory University, Atlanta, Georgia
| | - Michael E Zwick
- Department of Human Genetics, Emory University, Atlanta, Georgia; Department of Pediatrics, Emory University, Atlanta, Georgia
| | | | - Anna Murray
- University of Exeter Medical School, University of Exeter, Exeter, United Kingdom
| | - James N Macpherson
- Wessex Regional Genetics Laboratory, Salisbury District Hospital, Salisbury, United Kingdom
| | - Montserrat Mila
- Biochemistry and Molecular Genetics Department, Hospital Clinic of Barcelona and Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
| | - Laia Rodriguez-Revenga
- Biochemistry and Molecular Genetics Department, Hospital Clinic of Barcelona and Institut d'Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain; CIBER of Rare Diseases (CIBERER), Instituto de Salud Carlos III, Spain
| | - Elizabeth Berry-Kravis
- Departments of Pediatrics, Neurological Sciences, Biochemistry, Rush University Medical Center, Chicago, Illinois
| | - Deborah A Hall
- Department of Neurological Sciences, Rush University, Chicago, Illinois
| | - Maureen A Leehey
- Department of Neurology, University of Colorado School of Medicine, Aurora, Colorado
| | - Ying Liu
- Department of Neurology, University of Colorado School of Medicine, Aurora, Colorado
| | - Corrine Welt
- Division of Endocrinology, Metabolism and Diabetes, University of Utah School of Medicine, Salt Lake City, Utah
| | - Stephen T Warren
- Department of Human Genetics, Emory University, Atlanta, Georgia; Department of Pediatrics, Emory University, Atlanta, Georgia; Department of Biochemistry, Emory University, Atlanta, Georgia
| | - Stephanie L Sherman
- Department of Human Genetics, Emory University, Atlanta, Georgia; Department of Pediatrics, Emory University, Atlanta, Georgia
| | - Peng Jin
- Department of Human Genetics, Emory University, Atlanta, Georgia
| | - Emily G Allen
- Department of Human Genetics, Emory University, Atlanta, Georgia.
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15
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Li W, De Schutter K, Van Damme EJM, Smagghe G. RNAi-Mediated Silencing of Pgants Shows Core 1 O-Glycans Are Required for Pupation in Tribolium castaneum. Front Physiol 2021; 12:629682. [PMID: 33841170 PMCID: PMC8024498 DOI: 10.3389/fphys.2021.629682] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2020] [Accepted: 03/01/2021] [Indexed: 01/08/2023] Open
Abstract
Protein glycosylation is one of the most common and most important post-translational modifications. Despite the growing knowledge on N-glycosylation, the research on O-glycosylation is lagging behind. This study investigates the importance of O-glycosylation in the post-embryonic development of insects using the red flour beetle, Tribolium castaneum, as a model. We identified 28 O-glycosylation-related genes (OGRGs) in the genome of the red flour beetle. 14 OGRGs were selected for functional analysis based on their involvement in the initial attachment of the carbohydrate in the different O-glycosylation pathways or the further elongation of the most abundant O-glycans and, in addition, showing severe RNAi-induced phenotypes in Drosophila melanogaster. The expression profile of these OGRGs was mapped throughout the developmental stages of the insect and in the different tissues of the pupa and adult. Subsequently, these genes were silenced using RNA interference (RNAi) to analyze their role in development. A broad spectrum of phenotypes was observed: from subtle effects and disrupted wing formation when silencing the genes involved in O-mannosylation, to blockage of pupation and high mortality after silencing of the genes involved in O-GalNAc and core 1 O-glycan (O-GalNAc-Gal) synthesis. RNAi experiments were also performed to assess the effects of blocking multiple pathways of O-glycosylation. However, the observed phenotypes induced by multiple RNAi were similar to those of the single gene RNAi experiments. The silencing of OGRGs often resulted in high mortality and wing phenotypes, indicating the importance of O-glycosylation for the survival of the insect and the formation of wings during the post-embryonic development of T. castaneum.
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Affiliation(s)
- Weidong Li
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium.,Laboratory of Biochemistry and Glycobiology, Department of Biotechnology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Kristof De Schutter
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Els J M Van Damme
- Laboratory of Biochemistry and Glycobiology, Department of Biotechnology, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
| | - Guy Smagghe
- Laboratory of Agrozoology, Department of Plants and Crops, Faculty of Bioscience Engineering, Ghent University, Ghent, Belgium
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16
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Mechanistic Insights into Side Effects of Troglitazone and Rosiglitazone Using a Novel Inverse Molecular Docking Protocol. Pharmaceutics 2021; 13:pharmaceutics13030315. [PMID: 33670968 PMCID: PMC7997210 DOI: 10.3390/pharmaceutics13030315] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 02/23/2021] [Accepted: 02/25/2021] [Indexed: 12/15/2022] Open
Abstract
Thiazolidinediones form drugs that treat insulin resistance in type 2 diabetes mellitus. Troglitazone represents the first drug from this family, which was removed from use by the FDA due to its hepatotoxicity. As an alternative, rosiglitazone was developed, but it was under the careful watch of FDA for a long time due to suspicion, that it causes cardiovascular diseases, such as heart failure and stroke. We applied a novel inverse molecular docking protocol to discern the potential protein targets of both drugs. Troglitazone and rosiglitazone were docked into predicted binding sites of >67,000 protein structures from the Protein Data Bank and examined. Several new potential protein targets with successfully docked troglitazone and rosiglitazone were identified. The focus was devoted to human proteins so that existing or new potential side effects could be explained or proposed. Certain targets of troglitazone such as 3-oxo-5-beta-steroid 4-dehydrogenase, neutrophil collagenase, stromelysin-1, and VLCAD were pinpointed, which could explain its hepatoxicity, with additional ones indicating that its application could lead to the treatment/development of cancer. Results for rosiglitazone discerned its interaction with members of the matrix metalloproteinase family, which could lead to cancer and neurodegenerative disorders. The concerning cardiovascular side effects of rosiglitazone could also be explained. We firmly believe that our results deepen the mechanistic understanding of the side effects of both drugs, and potentially with further development and research maybe even help to minimize them. On the other hand, the novel inverse molecular docking protocol on the other hand carries the potential to develop into a standard tool to predict possible cross-interactions of drug candidates potentially leading to adverse side effects.
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17
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Banford S, McCorvie TJ, Pey AL, Timson DJ. Galactosemia: Towards Pharmacological Chaperones. J Pers Med 2021; 11:jpm11020106. [PMID: 33562227 PMCID: PMC7914515 DOI: 10.3390/jpm11020106] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2020] [Revised: 02/02/2021] [Accepted: 02/04/2021] [Indexed: 02/07/2023] Open
Abstract
Galactosemia is a rare inherited metabolic disease resulting from mutations in the four genes which encode enzymes involved in the metabolism of galactose. The current therapy, the removal of galactose from the diet, is inadequate. Consequently, many patients suffer lifelong physical and cognitive disability. The phenotype varies from almost asymptomatic to life-threatening disability. The fundamental biochemical cause of the disease is a decrease in enzymatic activity due to failure of the affected protein to fold and/or function correctly. Many novel therapies have been proposed for the treatment of galactosemia. Often, these are designed to treat the symptoms and not the fundamental cause. Pharmacological chaperones (PC) (small molecules which correct the folding of misfolded proteins) represent an exciting potential therapy for galactosemia. In theory, they would restore enzyme function, thus preventing downstream pathological consequences. In practice, no PCs have been identified for potential application in galactosemia. Here, we review the biochemical basis of the disease, identify opportunities for the application of PCs and describe how these might be discovered. We will conclude by considering some of the clinical issues which will affect the future use of PCs in the treatment of galactosemia.
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Affiliation(s)
- Samantha Banford
- South Eastern Health and Social Care Trust, Downpatrick BT30 6RL, UK;
| | - Thomas J. McCorvie
- Structural Genomics Consortium, University of Oxford, Oxford OX3 7DQ, UK;
| | - Angel L. Pey
- Departamento de Química Física, Unidad de Excelencia de Química aplicada a Biomedicina y Medioambiente e Instituto de Biotecnología, Facultad de Ciencias, Universidad de Granada, 18071 Granada, Spain;
| | - David J. Timson
- School of Pharmacy and Biomolecular Sciences, The University of Brighton, Brighton BN2 4GJ, UK
- Correspondence:
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18
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Haskovic M, Coelho AI, Bierau J, Vanoevelen JM, Steinbusch LKM, Zimmermann LJI, Villamor‐Martinez E, Berry GT, Rubio‐Gozalbo ME. Pathophysiology and targets for treatment in hereditary galactosemia: A systematic review of animal and cellular models. J Inherit Metab Dis 2020; 43:392-408. [PMID: 31808946 PMCID: PMC7317974 DOI: 10.1002/jimd.12202] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/16/2019] [Revised: 11/25/2019] [Accepted: 12/03/2019] [Indexed: 12/18/2022]
Abstract
Since the first description of galactosemia in 1908 and despite decades of research, the pathophysiology is complex and not yet fully elucidated. Galactosemia is an inborn error of carbohydrate metabolism caused by deficient activity of any of the galactose metabolising enzymes. The current standard of care, a galactose-restricted diet, fails to prevent long-term complications. Studies in cellular and animal models in the past decades have led to an enormous progress and advancement of knowledge. Summarising current evidence in the pathophysiology underlying hereditary galactosemia may contribute to the identification of treatment targets for alternative therapies that may successfully prevent long-term complications. A systematic review of cellular and animal studies reporting on disease complications (clinical signs and/or biochemical findings) and/or treatment targets in hereditary galactosemia was performed. PubMed/MEDLINE, EMBASE, and Web of Science were searched, 46 original articles were included. Results revealed that Gal-1-P is not the sole pathophysiological agent responsible for the phenotype observed in galactosemia. Other currently described contributing factors include accumulation of galactose metabolites, uridine diphosphate (UDP)-hexose alterations and subsequent impaired glycosylation, endoplasmic reticulum (ER) stress, altered signalling pathways, and oxidative stress. galactokinase (GALK) inhibitors, UDP-glucose pyrophosphorylase (UGP) up-regulation, uridine supplementation, ER stress reducers, antioxidants and pharmacological chaperones have been studied, showing rescue of biochemical and/or clinical symptoms in galactosemia. Promising co-adjuvant therapies include antioxidant therapy and UGP up-regulation. This systematic review provides an overview of the scattered information resulting from animal and cellular studies performed in the past decades, summarising the complex pathophysiological mechanisms underlying hereditary galactosemia and providing insights on potential treatment targets.
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Affiliation(s)
- Minela Haskovic
- Department of PediatricsMaastricht University Medical Center+MaastrichtThe Netherlands
- Department of Clinical GeneticsMaastricht University Medical Center+MaastrichtThe Netherlands
- GROW‐School for Oncology and Developmental Biology, Maastricht UniversityMaastrichtThe Netherlands
| | - Ana I. Coelho
- Department of PediatricsMaastricht University Medical Center+MaastrichtThe Netherlands
- Department of Clinical GeneticsMaastricht University Medical Center+MaastrichtThe Netherlands
- GROW‐School for Oncology and Developmental Biology, Maastricht UniversityMaastrichtThe Netherlands
| | - Jörgen Bierau
- Department of Clinical GeneticsMaastricht University Medical Center+MaastrichtThe Netherlands
| | - Jo M. Vanoevelen
- Department of Clinical GeneticsMaastricht University Medical Center+MaastrichtThe Netherlands
- GROW‐School for Oncology and Developmental Biology, Maastricht UniversityMaastrichtThe Netherlands
| | - Laura K. M. Steinbusch
- Department of Clinical GeneticsMaastricht University Medical Center+MaastrichtThe Netherlands
| | - Luc J. I. Zimmermann
- Department of PediatricsMaastricht University Medical Center+MaastrichtThe Netherlands
- GROW‐School for Oncology and Developmental Biology, Maastricht UniversityMaastrichtThe Netherlands
| | - Eduardo Villamor‐Martinez
- Department of PediatricsMaastricht University Medical Center+MaastrichtThe Netherlands
- GROW‐School for Oncology and Developmental Biology, Maastricht UniversityMaastrichtThe Netherlands
| | - Gerard T. Berry
- The Manton Center for Orphan Disease Research, Division of Genetics and GenomicsBoston Children's Hospital, Harvard Medical SchoolBostonMassachusetts
| | - M. Estela Rubio‐Gozalbo
- Department of PediatricsMaastricht University Medical Center+MaastrichtThe Netherlands
- Department of Clinical GeneticsMaastricht University Medical Center+MaastrichtThe Netherlands
- GROW‐School for Oncology and Developmental Biology, Maastricht UniversityMaastrichtThe Netherlands
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19
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Li C, Cai W, Liu S, Zhou C, Cao M, Yin H, Sun D, Zhang S, Loor JJ. Association of UDP-galactose-4-epimerase with milk protein concentration in the Chinese Holstein population. ASIAN-AUSTRALASIAN JOURNAL OF ANIMAL SCIENCES 2020; 33:1725-1731. [PMID: 32106650 PMCID: PMC7649079 DOI: 10.5713/ajas.19.0549] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Accepted: 02/14/2020] [Indexed: 01/20/2023]
Abstract
Objective An initial RNA-Sequencing study revealed that UDP-galactose-4-epimerase (GALE) was one of the most promising candidates for milk protein concentration in Chinese Holstein cattle. This enzyme catalyzes the interconversion of UDP-galactose and UDP-glucose, an important step in galactose catabolism. To further validate the genetic effect of GALE on milk protein traits, genetic variations were identified, and genotypes-phenotypes associations were performed. Methods The entire coding region and the 5′-regulatory region (5′-UTR) of GALE were re-sequenced using pooled DNA of 17 unrelated sires. Association studies for five milk production traits were performed using a mixed linear animal model with a population encompassing 1,027 Chinese Holstein cows. Results A total of three variants in GALE were identified, including two novel variants (g.2114 A>G and g.2037 G>A) in the 5′-UTR and one previously reported variant (g.3836 G>C) in an intron. All three single nucleotide polymorphisms (SNPs) were associated with milk yield (p<0.0001), fat yield (p = 0.0006 to <0.0001), protein yield (p = 0.0232 to <0.0001) and protein percentage (p<0.0001), while no significant associations were detected between the SNPs and fat percentage. A strong linkage disequilibrium (D’ = 0.96 to 1.00) was observed among all three SNPs, and a 5 Kb haplotype block involving three main haplotypes with GAG, AGC, and AGG was formed. The results of haplotype association analyses were consistent with the results of single locus association analysis (p<0.0001). The phenotypic variance ratio above 3.00% was observed for milk protein yield that was explained by SNP-g.3836G >C. Conclusion Overall, our findings provided new insights into the polymorphic variations in bovine GALE gene and their associations with milk protein concentration. The data indicate their potential uses for marker-assisted breeding or genetic selection schemes.
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Affiliation(s)
- Cong Li
- Shaanxi Key Laboratory of Molecular Biology for Agriculture, College of Animal Science and Technology, Northwest A&F University, Yangling, Shaanxi 712100, China
| | - Wentao Cai
- College of Animal Science and Technology, Key Laboratory of Animal Genetics and Breeding of Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing 100193, China
| | - Shuli Liu
- College of Animal Science and Technology, Key Laboratory of Animal Genetics and Breeding of Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing 100193, China
| | - Chenghao Zhou
- College of Animal Science and Technology, Key Laboratory of Animal Genetics and Breeding of Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing 100193, China
| | - Mingyue Cao
- College of Animal Science and Technology, Key Laboratory of Animal Genetics and Breeding of Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing 100193, China
| | - Hongwei Yin
- College of Animal Science and Technology, Key Laboratory of Animal Genetics and Breeding of Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing 100193, China
| | - Dongxiao Sun
- College of Animal Science and Technology, Key Laboratory of Animal Genetics and Breeding of Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing 100193, China
| | - Shengli Zhang
- College of Animal Science and Technology, Key Laboratory of Animal Genetics and Breeding of Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, China Agricultural University, Beijing 100193, China
| | - Juan J Loor
- Mammalian NutriPhysioGenomics, Department of Animal Sciences and Division of Nutritional Sciences, University of Illinois, Urbana, IL 61801, USA
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20
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Overexpression of UDP-Glucose 4-Epimerase Is Associated with Differentiation Grade of Gastric Cancer. DISEASE MARKERS 2019; 2019:6325326. [PMID: 31827638 PMCID: PMC6886318 DOI: 10.1155/2019/6325326] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/09/2019] [Revised: 10/08/2019] [Accepted: 11/02/2019] [Indexed: 11/20/2022]
Abstract
The UDP-glucose 4-epimerase (GALE) is a glycosyltransferase, which acts on protein and lipid glycosylation in normal and neoplastic cells. This study is aimed at investigating the differential tissue expression of GALE and its possible association with clinical-pathological parameters and the outcome of gastric adenocarcinoma patients. Seventy-one patients were evaluated in relation to GALE expression by immunohistochemistry. Our results showed that 48 (67.6%) patients were GALE positive and 23 (32.4%) negative. Positive staining was present on well-differentiated and moderate-differentiated histological grade of gastric adenocarcinomas (p < 0.0001). There was no significant association with outcome parameters (p > 0.05). Besides that, our results corroborated with the validation cohort analysis, where the expression of GALE mRNA was also associated with the histological grade (p < 0.001). These results suggest a possible use of this enzyme as a biomarker for well and moderately differentiated tumors.
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21
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Seo A, Gulsuner S, Pierce S, Ben-Harosh M, Shalev H, Walsh T, Krasnov T, Dgany O, Doulatov S, Tamary H, Shimamura A, King MC. Inherited thrombocytopenia associated with mutation of UDP-galactose-4-epimerase (GALE). Hum Mol Genet 2019; 28:133-142. [PMID: 30247636 DOI: 10.1093/hmg/ddy334] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2018] [Accepted: 09/07/2018] [Indexed: 12/11/2022] Open
Abstract
Severe thrombocytopenia, characterized by dysplastic megakaryocytes and intracranial bleeding, was diagnosed in six individuals from a consanguineous kindred. Three of the individuals were successfully treated by bone marrow transplant. Whole-exome sequencing and homozygosity mapping of multiple family members, coupled with whole-genome sequencing to reveal shared non-coding variants, revealed one potentially functional variant segregating with thrombocytopenia under a recessive model: GALE p.R51W (c.C151T, NM_001127621). The mutation is extremely rare (allele frequency = 2.5 × 10-05), and the likelihood of the observed co-segregation occurring by chance is 1.2 × 10-06. GALE encodes UDP-galactose-4-epimerase, an enzyme of galactose metabolism and glycosylation responsible for two reversible reactions: interconversion of UDP-galactose with UDP-glucose and interconversion of UDP-N-acetylgalactosamine with UDP-N-acetylglucosamine. The mutation alters an amino acid residue that is conserved from yeast to humans. The variant protein has both significantly lower enzymatic activity for both interconversion reactions and highly significant thermal instability. Proper glycosylation is critical to normal hematopoiesis, in particular to megakaryocyte and platelet development, as reflected in the presence of thrombocytopenia in the context of congenital disorders of glycosylation. Mutations in GALE have not previously been associated with thrombocytopenia. Our results suggest that GALE p.R51W is inadequate for normal glycosylation and thereby may impair megakaryocyte and platelet development. If other mutations in GALE are shown to have similar consequences, this gene may be proven to play a critical role in hematopoiesis.
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Affiliation(s)
- Aaron Seo
- Department of Genome Sciences, University of Washington, Seattle, WA, USA.,Department of Medicine, Division of Medical Genetics, University of Washington, Seattle, WA, USA
| | - Suleyman Gulsuner
- Department of Genome Sciences, University of Washington, Seattle, WA, USA.,Department of Medicine, Division of Medical Genetics, University of Washington, Seattle, WA, USA
| | - Sarah Pierce
- Department of Genome Sciences, University of Washington, Seattle, WA, USA.,Department of Medicine, Division of Medical Genetics, University of Washington, Seattle, WA, USA
| | - Miri Ben-Harosh
- Department of Pediatric Hematology/Oncology, Soroka Medical Center, Faculty of Medicine, Ben-Gurion University, Beer Sheva, Israel
| | - Hanna Shalev
- Department of Pediatric Hematology/Oncology, Soroka Medical Center, Faculty of Medicine, Ben-Gurion University, Beer Sheva, Israel
| | - Tom Walsh
- Department of Genome Sciences, University of Washington, Seattle, WA, USA.,Department of Medicine, Division of Medical Genetics, University of Washington, Seattle, WA, USA
| | - Tanya Krasnov
- Pediatric Hematology Laboratory, Felsenstein Medical Research Center, Petach Tikva, Israel
| | - Orly Dgany
- Pediatric Hematology Laboratory, Felsenstein Medical Research Center, Petach Tikva, Israel
| | - Sergei Doulatov
- Department of Medicine, Division of Hematology, University of Washington, Seattle, WA, USA
| | - Hannah Tamary
- Pediatric Hematology Laboratory, Felsenstein Medical Research Center, Petach Tikva, Israel.,Hematology Unit, Schneider Children's Medical Center, Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Akiko Shimamura
- Department of Pediatric Hematology/Oncology, Boston Children's Hospital, Dana Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Mary-Claire King
- Department of Genome Sciences, University of Washington, Seattle, WA, USA.,Department of Medicine, Division of Medical Genetics, University of Washington, Seattle, WA, USA
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22
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Chen LL, Han DL, Zhai YF, Wang JH, Wang YF, Chen M. Characterization and mutational analysis of two UDP-galactose 4-epimerases in Streptococcus pneumoniae TIGR4. BIOCHEMISTRY (MOSCOW) 2018. [DOI: 10.1134/s0006297918010054] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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23
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Zhu Y, Zhao S, Deng Y, Gordillo R, Ghaben AL, Shao M, Zhang F, Xu P, Li Y, Cao H, Zagnitko O, Scott DA, Gupta RK, Xing C, Zhang BB, Lin HV, Scherer PE. Hepatic GALE Regulates Whole-Body Glucose Homeostasis by Modulating Tff3 Expression. Diabetes 2017; 66:2789-2799. [PMID: 28877911 PMCID: PMC5652600 DOI: 10.2337/db17-0323] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Accepted: 08/28/2017] [Indexed: 01/03/2023]
Abstract
Transcripts of key enzymes in the Leloir pathway of galactose metabolism in mouse livers are significantly increased after chronic high-fat/high-sucrose feeding. UDP-galactose-4-epimerase (GALE) is the last enzyme in this pathway that converts UDP-galactose to UDP-glucose and was previously identified as a downstream target of the endoplasmic reticulum (ER) stress effector spliced X-box binding protein 1, suggesting an interesting cross talk between galactose and glucose metabolism in the context of hepatic ER stress and whole-body metabolic fitness. However, its specific role in glucose metabolism is not established. Using an inducible and tissue-specific mouse model, we report that hepatic overexpression of Gale increases gluconeogenesis from pyruvate and impairs glucose tolerance. Conversely, genetic reduction of Gale in liver improves glucose tolerance. Transcriptional profiling identifies trefoil factor 3 (Tff3) as one of the downstream targets of GALE. Restoration of Tff3 expression corrects glucose intolerance in Gale-overexpressing mice. These studies reveal a new link between hepatic GALE activity and whole-body glucose homeostasis via regulation of hepatic Tff3 expression.
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Affiliation(s)
- Yi Zhu
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN
- Touchstone Diabetes Center, UT Southwestern Medical Center, Dallas, TX
| | - Shangang Zhao
- Touchstone Diabetes Center, UT Southwestern Medical Center, Dallas, TX
| | - Yingfeng Deng
- Touchstone Diabetes Center, UT Southwestern Medical Center, Dallas, TX
| | - Ruth Gordillo
- Touchstone Diabetes Center, UT Southwestern Medical Center, Dallas, TX
| | | | - Mengle Shao
- Touchstone Diabetes Center, UT Southwestern Medical Center, Dallas, TX
| | - Fang Zhang
- Touchstone Diabetes Center, UT Southwestern Medical Center, Dallas, TX
- Key Laboratory of Nutrition and Metabolism, Institute for Nutritional Sciences, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Ping Xu
- Lilly China Research and Development Center, Shanghai, China
| | - Yang Li
- Lilly China Research and Development Center, Shanghai, China
| | - Huachuan Cao
- Lilly China Research and Development Center, Shanghai, China
| | - Olga Zagnitko
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA
| | - David A Scott
- Sanford Burnham Prebys Medical Discovery Institute, La Jolla, CA
| | - Rana K Gupta
- Touchstone Diabetes Center, UT Southwestern Medical Center, Dallas, TX
| | - Chao Xing
- McDermott Center for Human Growth and Development, UT Southwestern Medical Center, Dallas, TX
| | - Bei B Zhang
- Lilly China Research and Development Center, Shanghai, China
| | - Hua V Lin
- Lilly Research Laboratories, Eli Lilly and Company, Indianapolis, IN
| | - Philipp E Scherer
- Touchstone Diabetes Center, UT Southwestern Medical Center, Dallas, TX
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24
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Timson DJ. The molecular basis of galactosemia — Past, present and future. Gene 2016; 589:133-41. [DOI: 10.1016/j.gene.2015.06.077] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Revised: 06/18/2015] [Accepted: 06/29/2015] [Indexed: 12/19/2022]
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25
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Abstract
The galactosemias are a family of autosomal recessive genetic disorders resulting from impaired function of the Leloir pathway of galactose metabolism. Type I, or classic galactosemia, results from profound deficiency of galactose-1-phosphate uridylyltransferase, the second enzyme in the Leloir pathway. Type II galactosemia results from profound deficiency of galactokinase, the first enzyme in the Leloir pathway. Type III galactosemia results from partial deficiency of UDP galactose 4'-epimerase, the third enzyme in the Leloir pathway. Although at least classic galactosemia has been recognized clinically for more than 100 years, and detectable by newborn screening for more than 50 years, all three galactosemias remain poorly understood. Early detection and dietary restriction of galactose prevent neonatal lethality, but many affected infants grow to experience a broad range of developmental and other disabilities. To date, there is no intervention known that prevents or reverses these long-term complications. Drosophila melanogaster provides a genetically and biochemically facile model for these conditions, enabling studies that address mechanism and open the door for novel approaches to intervention.
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Affiliation(s)
- J M I Daenzer
- Emory University School of Medicine, Atlanta, GA, United States
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26
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Jumbo-Lucioni PP, Parkinson WM, Kopke DL, Broadie K. Coordinated movement, neuromuscular synaptogenesis and trans-synaptic signaling defects in Drosophila galactosemia models. Hum Mol Genet 2016; 25:3699-3714. [PMID: 27466186 DOI: 10.1093/hmg/ddw217] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2016] [Revised: 06/28/2016] [Accepted: 06/30/2016] [Indexed: 12/19/2022] Open
Abstract
The multiple galactosemia disease states manifest long-term neurological symptoms. Galactosemia I results from loss of galactose-1-phosphate uridyltransferase (GALT), which converts galactose-1-phosphate + UDP-glucose to glucose-1-phosphate + UDP-galactose. Galactosemia II results from loss of galactokinase (GALK), phosphorylating galactose to galactose-1-phosphate. Galactosemia III results from the loss of UDP-galactose 4'-epimerase (GALE), which interconverts UDP-galactose and UDP-glucose, as well as UDP-N-acetylgalactosamine and UDP-N-acetylglucosamine. UDP-glucose pyrophosphorylase (UGP) alternatively makes UDP-galactose from uridine triphosphate and galactose-1-phosphate. All four UDP-sugars are essential donors for glycoprotein biosynthesis with critical roles at the developing neuromuscular synapse. Drosophila galactosemia I (dGALT) and II (dGALK) disease models genetically interact; manifesting deficits in coordinated movement, neuromuscular junction (NMJ) development, synaptic glycosylation, and Wnt trans-synaptic signalling. Similarly, dGALE and dUGP mutants display striking locomotor and NMJ formation defects, including expanded synaptic arbours, glycosylation losses, and differential changes in Wnt trans-synaptic signalling. In combination with dGALT loss, both dGALE and dUGP mutants compromise the synaptomatrix glycan environment that regulates Wnt trans-synaptic signalling that drives 1) presynaptic Futsch/MAP1b microtubule dynamics and 2) postsynaptic Frizzled nuclear import (FNI). Taken together, these findings indicate UDP-sugar balance is a key modifier of neurological outcomes in all three interacting galactosemia disease models, suggest that Futsch homolog MAP1B and the Wnt Frizzled receptor may be disease-relevant targets in epimerase and transferase galactosemias, and identify UGP as promising new potential therapeutic target for galactosemia neuropathology.
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Affiliation(s)
| | | | | | - Kendal Broadie
- Department of Biological Sciences .,Kennedy Center for Research on Human Development, Vanderbilt University, Nashville, TN, USA
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27
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Tong F, Yang R, Hong F, Qian G, Jiang P, Gao R. A first case report of UDP-galactose-4'-epimerase deficiency in China: genotype and phenotype. J Pediatr Endocrinol Metab 2016; 29:379-83. [PMID: 26565537 DOI: 10.1515/jpem-2014-0462] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/10/2015] [Accepted: 10/19/2015] [Indexed: 11/15/2022]
Abstract
BACKGROUND The aim of the study was to investigate the incidence and genotype-phenotype characteristics of UDP-galactose-4'-epimerase (GALE) deficiency in newborn screening of Chinese population. METHODS Neonates were screened at the Newborn Screening Center of Zhejiang Province, China for GALE deficiency and their condition was confirmed by testing of the GALE gene and GALE enzyme. Clinical and laboratory follow-up data were recorded. RESULTS A total of 350,023 of newborns were screened; of which, the condition of one female neonate was diagnosed with GALE deficiency, accounting for an incidence rate of approximately 1:350,000 in our sample. The patient with GALE deficiency clinically manifested slight increase in levels of blood galactose (122-251 mg/L), glutamyl endopeptidase (61 U/L), total bile acid (17 μmol/L), and lactic acid (1.8 mmol/L). The neonate was fed with lactose-free powdered milk and followed-up to 1 year. Re-examination showed that all biochemical indicators recovered to normal range, whereas physical and mental development appeared normal without cataract change. The genotype of GALE deficiency was identified as compound heterozygous mutations: c.505C>T (p.R169W) and c.452G>A (p.G151D). The latter was a novel mutation. The GALE enzyme value was 42% of control. CONCLUSIONS GALE deficiency is relatively rare in China. The genotype of compound heterozygous mutations at R169W and G151D clinically manifest as mild-type; it is recommended to limit galactose diet.
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Affiliation(s)
- Fan Tong
- Department of Genetics and Metabolism, Children’s Hospital, Zhejiang University School of Medicine, Hangzhou, P.R. China
| | - Rulai Yang
- Department of Genetics and Metabolism, Children’s Hospital, Zhejiang University School of Medicine, Hangzhou, P.R. China
| | - Fang Hong
- Department of Genetics and Metabolism, Children’s Hospital, Zhejiang University School of Medicine, Hangzhou, P.R. China
| | - Guling Qian
- Department of Genetics and Metabolism, Children’s Hospital, Zhejiang University School of Medicine, Hangzhou, P.R. China
| | | | - Rui Gao
- Key Laboratory of Bioinformatics of Zhejiang Province, Hangzhou, P.R. China
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28
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Dönertaş HM, Martínez Cuesta S, Rahman SA, Thornton JM. Characterising Complex Enzyme Reaction Data. PLoS One 2016; 11:e0147952. [PMID: 26840640 PMCID: PMC4740462 DOI: 10.1371/journal.pone.0147952] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2015] [Accepted: 01/11/2016] [Indexed: 01/05/2023] Open
Abstract
The relationship between enzyme-catalysed reactions and the Enzyme Commission (EC) number, the widely accepted classification scheme used to characterise enzyme activity, is complex and with the rapid increase in our knowledge of the reactions catalysed by enzymes needs revisiting. We present a manual and computational analysis to investigate this complexity and found that almost one-third of all known EC numbers are linked to more than one reaction in the secondary reaction databases (e.g., KEGG). Although this complexity is often resolved by defining generic, alternative and partial reactions, we have also found individual EC numbers with more than one reaction catalysing different types of bond changes. This analysis adds a new dimension to our understanding of enzyme function and might be useful for the accurate annotation of the function of enzymes and to study the changes in enzyme function during evolution.
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Affiliation(s)
- Handan Melike Dönertaş
- European Molecular Biology Laboratory, European Bioinformatics Institute EMBL-EBI, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
- Department of Biological Sciences, Middle East Technical University, Ankara, Turkey
| | - Sergio Martínez Cuesta
- European Molecular Biology Laboratory, European Bioinformatics Institute EMBL-EBI, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
| | - Syed Asad Rahman
- European Molecular Biology Laboratory, European Bioinformatics Institute EMBL-EBI, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
| | - Janet M. Thornton
- European Molecular Biology Laboratory, European Bioinformatics Institute EMBL-EBI, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
- * E-mail:
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29
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Campos A, Danielsson G, Farinha AP, Kuruvilla J, Warholm P, Cristobal S. Shotgun proteomics to unravel marine mussel (Mytilus edulis) response to long-term exposure to low salinity and propranolol in a Baltic Sea microcosm. J Proteomics 2016; 137:97-106. [PMID: 26820222 DOI: 10.1016/j.jprot.2016.01.010] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 12/23/2015] [Accepted: 01/19/2016] [Indexed: 02/06/2023]
Abstract
UNLABELLED Pharmaceuticals, among them the β-adrenoceptor blocker propranolol, are an important group of environmental contaminants reported in European waters. Laboratory exposure to pharmaceuticals on marine species has been performed without considering the input of the ecosystem flow. To unravel the ecosystem response to long-term exposure to propranolol we have performed long-term exposure to propranolol and low salinity in microcosms. We applied shotgun proteomic analysis to gills of Mytilus edulis from those Baltic Sea microcosms and identified 2071 proteins with a proteogenomic strategy. The proteome profiling patterns from the 587 highly reproductive proteins among groups define salinity as a key factor in the mussel's response to propranolol. Exposure at low salinity drives molecular mechanisms of adaptation based on a decrease in the abundance of several cytoskeletal proteins, signalling and intracellular membrane trafficking pathway combined with a response towards the maintenance of transcription and translation. The exposure to propranolol combined with low salinity modulates the expression of structural proteins including cilia functions and decreases the expression of membrane protein transporters. This study reinforces the environment concerns of the impact of low salinity in combination with anthropogenic pollutants and anticipates critical physiological conditions for the survival of the blue mussel in the northern areas. BIOLOGICAL SIGNIFICANCE Applying shotgun proteomic analysis to M. edulis gills samples from a long-term microcosm exposure to propranolol and following a proteogenomic identification strategy, we have identified 2071 proteins. The proteomic analysis unrevealed which molecular mechanisms drive the adaptation to low salinity stress and how salinity modulates the effects of exposure to propranolol. These results reinforce the idea of the impact of low salinity in combination with anthropogenic pollutants and anticipate critical physiological condition.
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Affiliation(s)
- Alexandre Campos
- Department of Clinical and Experimental Medicine, Cell Biology, Faculty of Medicine, Linköping University, Linköping, Sweden
| | - Gabriela Danielsson
- Department of Biochemistry and Biophysics, Science for Life Laboratory, Stockholm University, Stockholm, Sweden
| | - Ana Paula Farinha
- Department of Clinical and Experimental Medicine, Cell Biology, Faculty of Medicine, Linköping University, Linköping, Sweden
| | - Jacob Kuruvilla
- Department of Clinical and Experimental Medicine, Cell Biology, Faculty of Medicine, Linköping University, Linköping, Sweden
| | - Per Warholm
- Department of Biochemistry and Biophysics, Science for Life Laboratory, Stockholm University, Stockholm, Sweden
| | - Susana Cristobal
- Department of Clinical and Experimental Medicine, Cell Biology, Faculty of Medicine, Linköping University, Linköping, Sweden; IKERBASQUE, Basque Foundation for Science, Bilbao, Bizkaia, Spain; Department of Physiology, Faculty of Medicine and Dentistry, University of Basque Country UPV/EHU, Bizkaia, Spain.
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30
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Willems AP, van Engelen BGM, Lefeber DJ. Genetic defects in the hexosamine and sialic acid biosynthesis pathway. Biochim Biophys Acta Gen Subj 2015; 1860:1640-54. [PMID: 26721333 DOI: 10.1016/j.bbagen.2015.12.017] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 12/18/2015] [Accepted: 12/19/2015] [Indexed: 01/10/2023]
Abstract
BACKGROUND Congenital disorders of glycosylation are caused by defects in the glycosylation of proteins and lipids. Classically, gene defects with multisystem disease have been identified in the ubiquitously expressed glycosyltransferases required for protein N-glycosylation. An increasing number of defects are being described in sugar supply pathways for protein glycosylation with tissue-restricted clinical symptoms. SCOPE OF REVIEW In this review, we address the hexosamine and sialic acid biosynthesis pathways in sugar metabolism. GFPT1, PGM3 and GNE are essential for synthesis of nucleotide sugars uridine diphosphate N-acetylglucosamine (UDP-GlcNAc) and cytidine-5'-monophospho-N-acetylneuraminic acid (CMP-sialic acid) as precursors for various glycosylation pathways. Defects in these enzymes result in contrasting clinical phenotypes of congenital myasthenia, immunodeficiency or adult-onset myopathy, respectively. We therefore discuss the biochemical mechanisms of known genetic defects in the hexosamine and CMP-sialic acid synthesis pathway in relation to the clinical phenotypes. MAJOR CONCLUSIONS Both UDP-GlcNAc and CMP-sialic acid are important precursors for diverse protein glycosylation reactions and for conversion into other nucleotide-sugars. Defects in the synthesis of these nucleotide sugars might affect a wide range of protein glycosylation reactions. Involvement of multiple glycosylation pathways might contribute to disease phenotype, but the currently available biochemical information on sugar metabolism is insufficient to understand why defects in these pathways present with tissue-specific phenotypes. GENERAL SIGNIFICANCE Future research on the interplay between sugar metabolism and different glycosylation pathways in a tissue- and cell-specific manner will contribute to elucidation of disease mechanisms and will create new opportunities for therapeutic intervention. This article is part of a Special Issue entitled "Glycans in personalised medicine" Guest Editor: Professor Gordan Lauc.
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Affiliation(s)
- Anke P Willems
- Department of Neurology, Donders Institute for Brain, Cognition and Behavior, Radboud University Medical Centre, Box 9101, 6500 HB Nijmegen, The Netherlands; Department of Laboratory Medicine, Translational Metabolic Laboratory, Radboudumc Institute for Molecular Life Sciences, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | - Baziel G M van Engelen
- Department of Neurology, Donders Institute for Brain, Cognition and Behavior, Radboud University Medical Centre, Box 9101, 6500 HB Nijmegen, The Netherlands
| | - Dirk J Lefeber
- Department of Neurology, Donders Institute for Brain, Cognition and Behavior, Radboud University Medical Centre, Box 9101, 6500 HB Nijmegen, The Netherlands; Department of Laboratory Medicine, Translational Metabolic Laboratory, Radboudumc Institute for Molecular Life Sciences, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands.
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31
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Beerens K, Soetaert W, Desmet T. UDP-hexose 4-epimerases: a view on structure, mechanism and substrate specificity. Carbohydr Res 2015; 414:8-14. [PMID: 26162744 DOI: 10.1016/j.carres.2015.06.006] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2015] [Revised: 06/09/2015] [Accepted: 06/13/2015] [Indexed: 12/19/2022]
Abstract
UDP-sugar 4-epimerase (GalE) belongs to the short-chain dehydrogenase/reductase (SDR) superfamily of proteins and is one of enzymes in the Leloir pathway. They have been shown to be important virulence factors in a number of Gram-negative pathogens and to be involved in the biosynthesis of different polysaccharide structures. The metabolic disease type III galactosemia is caused by detrimental mutations in the human GalE. GalE and related enzymes display unusual enzymologic, chemical, and stereochemical properties; including irreversible binding of the cofactor NAD and uridine nucleotide-induced activation of this cofactor. These epimerases have been found active on UDP-hexoses, the N-acetylated and uronic acid forms thereof as well as UDP-pentoses. As they are involved in different pathways and functions, a deeper understanding of the enzymes, and their substrate promiscuity and/or selectivity, could lead to drug and vaccine design as well as antibiotic and probiotic development. This review summarizes the research performed on UDP-sugar 4-epimerases' structure, mechanism and substrate promiscuity.
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Affiliation(s)
- Koen Beerens
- Centre for Industrial Biotechnology and Biocatalysis, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000 Gent, Belgium.
| | - Wim Soetaert
- Centre for Industrial Biotechnology and Biocatalysis, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000 Gent, Belgium
| | - Tom Desmet
- Centre for Industrial Biotechnology and Biocatalysis, Faculty of Bioscience Engineering, Ghent University, Coupure links 653, 9000 Gent, Belgium
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32
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Pey AL, Padín-Gonzalez E, Mesa-Torres N, Timson DJ. The metastability of human UDP-galactose 4'-epimerase (GALE) is increased by variants associated with type III galactosemia but decreased by substrate and cofactor binding. Arch Biochem Biophys 2014; 562:103-14. [PMID: 25150110 DOI: 10.1016/j.abb.2014.07.030] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Revised: 07/22/2014] [Accepted: 07/23/2014] [Indexed: 01/30/2023]
Abstract
Type III galactosemia is an inherited disease caused by mutations which affect the activity of UDP-galactose 4'-epimerase (GALE). We evaluated the impact of four disease-associated variants (p.N34S, p.G90E, p.V94M and p.K161N) on the conformational stability and dynamics of GALE. Thermal denaturation studies showed that wild-type GALE denatures at temperatures close to physiological, and disease-associated mutations often reduce GALE's thermal stability. This denaturation is under kinetic control and results partly from dimer dissociation. The natural ligands, NAD(+) and UDP-glucose, stabilize GALE. Proteolysis studies showed that the natural ligands and disease-associated variations affect local dynamics in the N-terminal region of GALE. Proteolysis kinetics followed a two-step irreversible model in which the intact protein is cleaved at Ala38 forming a long-lived intermediate in the first step. NAD(+) reduces the rate of the first step, increasing the amount of undigested protein whereas UDP-glucose reduces the rate of the second step, increasing accumulation of the intermediate. Disease-associated variants affect these rates and the amounts of protein in each state. Our results also suggest communication between domains in GALE. We hypothesize that, in vivo, concentrations of natural ligands modulate GALE stability and that it should be possible to discover compounds which mimic the stabilising effects of the natural ligands overcoming mutation-induced destabilization.
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Affiliation(s)
- Angel L Pey
- Department of Physical Chemistry, Faculty of Sciences, University of Granada, Av. Fuentenueva s/n, 18071, Spain.
| | - Esperanza Padín-Gonzalez
- Department of Physical Chemistry, Faculty of Sciences, University of Granada, Av. Fuentenueva s/n, 18071, Spain
| | - Noel Mesa-Torres
- Department of Physical Chemistry, Faculty of Sciences, University of Granada, Av. Fuentenueva s/n, 18071, Spain
| | - David J Timson
- School of Biological Sciences, Queeńs University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, UK.
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UDP-galactose 4'-epimerase from the liver fluke, Fasciola hepatica: biochemical characterization of the enzyme and identification of inhibitors. Parasitology 2014; 142:463-72. [PMID: 25124392 DOI: 10.1017/s003118201400136x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Leloir pathway enzyme uridine diphosphate (UDP)-galactose 4'-epimerase from the common liver fluke Fasciola hepatica (FhGALE) was identified and characterized. The enzyme can be expressed in, and purified from, Escherichia coli. The recombinant enzyme is active: the K(m) (470 μM) is higher than the corresponding human enzyme (HsGALE), whereas the k(cat) (2.3 s(-1)) is substantially lower. FhGALE binds NAD(+) and has shown to be dimeric by analytical gel filtration. Like the human and yeast GALEs, FhGALE is stabilized by the substrate UDP-galactose. Molecular modelling predicted that FhGALE adopts a similar overall fold to HsGALE and that tyrosine 155 is likely to be the catalytically critical residue in the active site. In silico screening of the National Cancer Institute Developmental Therapeutics Program library identified 40 potential inhibitors of FhGALE which were tested in vitro. Of these, 6 showed concentration-dependent inhibition of FhGALE, some with nanomolar IC50 values. Two inhibitors (5-fluoroorotate and N-[(benzyloxy)carbonyl]leucyltryptophan) demonstrated selectivity for FhGALE over HsGALE. These compounds also thermally destabilized FhGALE in a concentration-dependent manner. Interestingly, the selectivity of 5-fluoroorotate was not shown by orotic acid, which differs in structure by 1 fluorine atom. These results demonstrate that, despite the structural and biochemical similarities of FhGALE and HsGALE, it is possible to discover compounds which preferentially inhibit FhGALE.
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Timson DJ, Lindert S. Comparison of dynamics of wildtype and V94M human UDP-galactose 4-epimerase-A computational perspective on severe epimerase-deficiency galactosemia. Gene 2013; 526:318-24. [PMID: 23732289 DOI: 10.1016/j.gene.2013.05.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2013] [Revised: 05/11/2013] [Accepted: 05/21/2013] [Indexed: 11/25/2022]
Abstract
UDP-galactose 4'-epimerase (GALE) catalyzes the interconversion of UDP-galactose and UDP-glucose, an important step in galactose catabolism. Type III galactosemia, an inherited metabolic disease, is associated with mutations in human GALE. The V94M mutation has been associated with a very severe form of type III galactosemia. While a variety of structural and biochemical studies have been reported that elucidate differences between the wildtype and this mutant form of human GALE, little is known about the dynamics of the protein and how mutations influence structure and function. We performed molecular dynamics simulations on the wildtype and V94M enzyme in different states of substrate and cofactor binding. In the mutant, the average distance between the substrate and both a key catalytic residue (Tyr157) and the enzyme-bound NAD+ cofactor and the active site dynamics are altered making substrate binding slightly less stable. However, overall stability or dynamics of the protein is not altered. This is consistent with experimental findings that the impact is largely on the turnover number (kcat), with less substantial effects on Km. Active site fluctuations were found to be correlated in enzyme with substrate bound to just one of the subunits in the homodimer suggesting inter-subunit communication. Greater active site loop mobility in human GALE compared to the equivalent loop in Escherichia coli GALE explains why the former can catalyze the interconversion of UDP-N-acetylgalactosamine and UDP-N-acetylglucosamine while the bacterial enzyme cannot. This work illuminates molecular mechanisms of disease and may inform the design of small molecule therapies for type III galactosemia.
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Affiliation(s)
- David J Timson
- School of Biological Sciences, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast BT9 7BL, UK
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McCorvie TJ, Timson DJ. In silico prediction of the effects of mutations in the human UDP-galactose 4'-epimerase gene: towards a predictive framework for type III galactosemia. Gene 2013; 524:95-104. [PMID: 23644136 DOI: 10.1016/j.gene.2013.04.061] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2013] [Revised: 03/30/2013] [Accepted: 04/11/2013] [Indexed: 10/26/2022]
Abstract
The enzyme UDP-galactose 4'-epimerase (GALE) catalyses the reversible epimerisation of both UDP-galactose and UDP-N-acetyl-galactosamine. Deficiency of the human enzyme (hGALE) is associated with type III galactosemia. The majority of known mutations in hGALE are missense and private thus making clinical guidance difficult. In this study a bioinformatics approach was employed to analyse the structural effects due to each mutation using both the UDP-glucose and UDP-N-acetylglucosamine bound structures of the wild-type protein. Changes to the enzyme's overall stability, substrate/cofactor binding and propensity to aggregate were also predicted. These predictions were found to be in good agreement with previous in vitro and in vivo studies when data was available and allowed for the differentiation of those mutants that severely impair the enzyme's activity against UDP-galactose. Next this combination of techniques were applied to another twenty-six reported variants from the NCBI dbSNP database that have yet to be studied to predict their effects. This identified p.I14T, p.R184H and p.G302R as likely severely impairing mutations. Although severely impaired mutants were predicted to decrease the protein's stability, overall predicted stability changes only weakly correlated with residual activity against UDP-galactose. This suggests other protein functions such as changes in cofactor and substrate binding may also contribute to the mechanism of impairment. Finally this investigation shows that this combination of different in silico approaches is useful in predicting the effects of mutations and that it could be the basis of an initial prediction of likely clinical severity when new hGALE mutants are discovered.
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Affiliation(s)
- Thomas J McCorvie
- School of Biological Sciences, Queen's University Belfast, Medical Biology Centre, 97 Lisburn Road, Belfast, BT9 7BL, UK
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Liu YY, Nagpure BV, Wong PTH, Bian JS. Hydrogen sulfide protects SH-SY5Y neuronal cells against d-galactose induced cell injury by suppression of advanced glycation end products formation and oxidative stress. Neurochem Int 2012; 62:603-9. [PMID: 23274001 DOI: 10.1016/j.neuint.2012.12.010] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Revised: 11/29/2012] [Accepted: 12/18/2012] [Indexed: 10/27/2022]
Abstract
d-Galactose is widely used as an agent to cause aging effects in experimental animals. The present study aims to investigate the effects of hydrogen sulfide (H2S) in human neuroblastoma SH-SY5Y cells exposed to d-galactose. Cells were pretreated with NaHS, an H2S donor, and then exposed to d-galactose (25-400mM for 48h). We found that NaHS pretreatment significantly reversed the d-galactose-induced cell death and cellular senescence. MTT assay shows that NaHS significantly increased cell viability from 62.31±1.29% to 72.34±0.46% compared with d-galactose (200mM) treatment group. The underlying mechanism appeared to involve a reduction by NaHS in the formation of advanced glycation end products (AGEs), which are known to contribute to the progression of age-related diseases. In addition, NaHS decreased the elevation of reactive oxygen species from 151.17±2.07% to 124.8±2.89% and malondialdehyde from 1.72±0.07 to 1.10±0.08 (nmol/mg protein) in SH-SY5Y cells after d-galactose exposure. NaHS also stimulated activities of superoxide dismutase from 0.42±0.05 to 0.73±0.04 (U/mg protein) and glutathione peroxidase from 3.98±0.73 to 14.73±0.77 (nmol/min/mg protein) and upregulated the gene expression levels of copper transport protein ATOX1, glutathione synthetase (GSS) and thioredoxin reductase 1 (TXNRD1) while down-regulated aldehyde oxidase 1 (AOX1). In summary, our data indicate that H2S may have potentially anti-aging effects through the inhibition of AGEs formation and reduction of oxidative stress.
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Affiliation(s)
- Yan-Ying Liu
- Department of Pharmacology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117597, Singapore
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