1
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Huang JY, Delbianco M. On resin synthesis of phosphoethanolamine cellulose. Org Biomol Chem 2024. [PMID: 39158055 DOI: 10.1039/d4ob01121j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/20/2024]
Abstract
Phosphoethanoamine (pEtN) cellulose is a chemically modified cellulose present in some bacterial biofilms. To deepen our understanding of this biopolymer and its biological function, access to chemically defined pEtN-cellulose oligosaccharides is desirable. Herein, we report an on resin protocol for the fast synthesis of tailor-made pEtN-celluloses. The cellulose backbone is prepared by automated glycan assembly and then specifically functionalized with pEtN groups, allowing for access to a collection of ten pEtN-cellulose oligomers with different amount and pattern of pEtN.
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Affiliation(s)
- Jhih-Yi Huang
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany.
- Department of Chemistry and Biochemistry, Freie Universitäte Berlin, Arnimallee 22, 14195 Berlin, Germany
| | - Martina Delbianco
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, Am Mühlenberg 1, 14476 Potsdam, Germany.
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2
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Wojtkiewicz M, Subramanian SP, Gundry RL. Multinozzle Emitter for Improved Negative Mode Analysis of Reduced Native N-Glycans by Microflow Porous Graphitized Carbon Liquid Chromatography Mass Spectrometry. Anal Chem 2024; 96:5746-5751. [PMID: 38556995 PMCID: PMC11024887 DOI: 10.1021/acs.analchem.3c03649] [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: 08/15/2023] [Revised: 02/13/2024] [Accepted: 03/18/2024] [Indexed: 04/04/2024]
Abstract
Microflow porous graphitized carbon liquid chromatography (PGC-LC) combined with negative mode ionization mass spectrometry (MS) provides high resolution separation and identification of reduced native N-glycan structural isomers. However, insufficient spray quality and low ionization efficiency of N-glycans present challenges for negative mode electrospray. Here, we evaluated the performance of a recently developed multinozzle electrospray source (MnESI) and accompanying M3 emitter for microflow PGC-LC-MS analysis of N-glycans in negative mode. In comparison to a standard electrospray ionization source, the MnESI with an M3 emitter improves signal intensity, identification, quantification, and resolution of structural isomers to accommodate low-input samples.
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Affiliation(s)
- Melinda Wojtkiewicz
- CardiOmics
Program, Center for Heart and Vascular Research, and Department of
Cellular and Integrative Physiology, University
of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Sabarinath Peruvemba Subramanian
- CardiOmics
Program, Center for Heart and Vascular Research, and Department of
Cellular and Integrative Physiology, University
of Nebraska Medical Center, Omaha, Nebraska 68198, United States
| | - Rebekah L. Gundry
- CardiOmics
Program, Center for Heart and Vascular Research, and Department of
Cellular and Integrative Physiology, University
of Nebraska Medical Center, Omaha, Nebraska 68198, United States
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3
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Eckmair B, Gao C, Mehta AY, Dutkiewicz Z, Vanbeselaere J, Cummings RD, Paschinger K, Wilson IBH. Recognition of Highly Branched N-Glycans of the Porcine Whipworm by the Immune System. Mol Cell Proteomics 2024; 23:100711. [PMID: 38182041 PMCID: PMC10850124 DOI: 10.1016/j.mcpro.2024.100711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2023] [Revised: 12/14/2023] [Accepted: 01/02/2024] [Indexed: 01/07/2024] Open
Abstract
Glycans are key to host-pathogen interactions, whereby recognition by the host and immunomodulation by the pathogen can be mediated by carbohydrate binding proteins, such as lectins of the innate immune system, and their glycoconjugate ligands. Previous studies have shown that excretory-secretory products of the porcine nematode parasite Trichuris suis exert immunomodulatory effects in a glycan-dependent manner. To better understand the mechanisms of these interactions, we prepared N-glycans from T. suis and both analyzed their structures and used them to generate a natural glycan microarray. With this array, we explored the interactions of glycans with C-type lectins, C-reactive protein, and sera from T. suis-infected pigs. Glycans containing LacdiNAc and phosphorylcholine-modified glycans were associated with the highest binding by most of these proteins. In-depth analysis revealed not only fucosylated LacdiNAc motifs with and without phosphorylcholine moieties but phosphorylcholine-modified mannose and N-acetylhexosamine-substituted fucose residues, in the context of maximally tetraantennary N-glycan scaffolds. Furthermore, O-glycans also contained fucosylated motifs. In summary, the glycans of T. suis are recognized by both the innate and adaptive immune systems and also exhibit species-specific features distinguishing its glycome from those of other nematodes.
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Affiliation(s)
- Barbara Eckmair
- Department für Chemie, Institut für Biochemie, Universität für Bodenkultur, Wien, Austria
| | - Chao Gao
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Akul Y Mehta
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Zuzanna Dutkiewicz
- Department für Chemie, Institut für Biochemie, Universität für Bodenkultur, Wien, Austria
| | - Jorick Vanbeselaere
- Department für Chemie, Institut für Biochemie, Universität für Bodenkultur, Wien, Austria
| | - Richard D Cummings
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, Massachusetts, USA
| | - Katharina Paschinger
- Department für Chemie, Institut für Biochemie, Universität für Bodenkultur, Wien, Austria
| | - Iain B H Wilson
- Department für Chemie, Institut für Biochemie, Universität für Bodenkultur, Wien, Austria.
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4
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Fossa SL, Anton BP, Kneller DW, Petralia LMC, Ganatra MB, Boisvert ML, Vainauskas S, Chan SH, Hokke CH, Foster JM, Taron CH. A novel family of sugar-specific phosphodiesterases that remove zwitterionic modifications of GlcNAc. J Biol Chem 2023; 299:105437. [PMID: 37944617 PMCID: PMC10704324 DOI: 10.1016/j.jbc.2023.105437] [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: 06/06/2023] [Revised: 10/27/2023] [Accepted: 10/31/2023] [Indexed: 11/12/2023] Open
Abstract
The zwitterions phosphorylcholine (PC) and phosphoethanolamine (PE) are often found esterified to certain sugars in polysaccharides and glycoconjugates in a wide range of biological species. One such modification involves PC attachment to the 6-carbon of N-acetylglucosamine (GlcNAc-6-PC) in N-glycans and glycosphingolipids (GSLs) of parasitic nematodes, a modification that helps the parasite evade host immunity. Knowledge of enzymes involved in the synthesis and degradation of PC and PE modifications is limited. More detailed studies on such enzymes would contribute to a better understanding of the function of PC modifications and have potential application in the structural analysis of zwitterion-modified glycans. In this study, we used functional metagenomic screening to identify phosphodiesterases encoded in a human fecal DNA fosmid library that remove PC from GlcNAc-6-PC. A novel bacterial phosphodiesterase was identified and biochemically characterized. This enzyme (termed GlcNAc-PDase) shows remarkable substrate preference for GlcNAc-6-PC and GlcNAc-6-PE, with little or no activity on other zwitterion-modified hexoses. The identified GlcNAc-PDase protein sequence is a member of the large endonuclease/exonuclease/phosphatase superfamily where it defines a distinct subfamily of related sequences of previously unknown function, mostly from Clostridium bacteria species. Finally, we demonstrate use of GlcNAc-PDase to confirm the presence of GlcNAc-6-PC in N-glycans and GSLs of the parasitic nematode Brugia malayi in a glycoanalytical workflow.
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Affiliation(s)
- Samantha L Fossa
- Research Department, New England Biolabs, Ipswich, Massachusetts, USA
| | - Brian P Anton
- Research Department, New England Biolabs, Ipswich, Massachusetts, USA
| | - Daniel W Kneller
- Research Department, New England Biolabs, Ipswich, Massachusetts, USA
| | - Laudine M C Petralia
- Research Department, New England Biolabs, Ipswich, Massachusetts, USA; Department of Parasitology, Leiden University - Center of Infectious Diseases, Leiden University Medical Center, Leiden, The Netherlands
| | - Mehul B Ganatra
- Research Department, New England Biolabs, Ipswich, Massachusetts, USA
| | | | | | - Siu-Hong Chan
- Research Department, New England Biolabs, Ipswich, Massachusetts, USA
| | - Cornelis H Hokke
- Department of Parasitology, Leiden University - Center of Infectious Diseases, Leiden University Medical Center, Leiden, The Netherlands
| | - Jeremy M Foster
- Research Department, New England Biolabs, Ipswich, Massachusetts, USA
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5
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Poulhazan A, Baer A, Daliaho G, Mentink-Vigier F, Arnold AA, Browne DC, Hering L, Archer-Hartmann S, Pepi LE, Azadi P, Schmidt S, Mayer G, Marcotte I, Harrington MJ. Peculiar Phosphonate Modifications of Velvet Worm Slime Revealed by Advanced Nuclear Magnetic Resonance and Mass Spectrometry. J Am Chem Soc 2023; 145:20749-20754. [PMID: 37722679 PMCID: PMC10540779 DOI: 10.1021/jacs.3c06798] [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: 06/28/2023] [Indexed: 09/20/2023]
Abstract
Nature is rich with examples of highly specialized biological materials produced by organisms for functions, including defense, hunting, and protection. Along these lines, velvet worms (Onychophora) expel a protein-based slime used for hunting and defense that upon shearing and dehydration forms fibers as stiff as thermoplastics. These fibers can dissolve back into their precursor proteins in water, after which they can be drawn into new fibers, providing biological inspiration to design recyclable materials. Elevated phosphorus content in velvet worm slime was previously observed and putatively ascribed to protein phosphorylation. Here, we show instead that phosphorus is primarily present as phosphonate moieties in the slime of distantly related velvet worm species. Using high-resolution nuclear magnetic resonance (NMR), natural abundance dynamic nuclear polarization (DNP), and mass spectrometry (MS), we demonstrate that 2-aminoethyl phosphonate (2-AEP) is associated with glycans linked to large slime proteins, while transcriptomic analyses confirm the expression of 2-AEP synthesizing enzymes in slime glands. The evolutionary conservation of this rare protein modification suggests an essential functional role of phosphonates in velvet worm slime and should stimulate further study of the function of this unusual chemical modification in nature.
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Affiliation(s)
- Alexandre Poulhazan
- Department
of Chemistry, Université du Québec
à Montréal, Montreal, Quebec H2X 2J6, Canada
| | - Alexander Baer
- Department
of Zoology, Institute of Biology, University
of Kassel, Kassel D-34132, Germany
| | - Gagan Daliaho
- Department
of Chemistry, McGill University, Montreal, Quebec H3A 0B8, Canada
| | | | - Alexandre A. Arnold
- Department
of Chemistry, Université du Québec
à Montréal, Montreal, Quebec H2X 2J6, Canada
| | - Darren C. Browne
- Department
of Biological and Chemical Sciences, University
of the West Indies, Cave Hill Campus, Barbados BB11000, West Indies
| | - Lars Hering
- Department
of Zoology, Institute of Biology, University
of Kassel, Kassel D-34132, Germany
| | | | - Lauren E. Pepi
- Complex
Carbohydrate Research Center, University
of Georgia, Athens, Georgia 30602, United States
| | - Parastoo Azadi
- Complex
Carbohydrate Research Center, University
of Georgia, Athens, Georgia 30602, United States
| | - Stephan Schmidt
- Chemistry
Department, Heinrich-Heine-Universität
Düsseldorf, Düsseldorf D-40225, Germany
| | - Georg Mayer
- Department
of Zoology, Institute of Biology, University
of Kassel, Kassel D-34132, Germany
| | - Isabelle Marcotte
- Department
of Chemistry, Université du Québec
à Montréal, Montreal, Quebec H2X 2J6, Canada
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6
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Eckmair B, Gao C, Mehta AY, Dutkiewicz Z, Vanbeselaere J, Cummings RD, Paschinger K, Wilson IBH. Recognition of highly branched N-glycans of the porcine whipworm by the immune system. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.09.21.557549. [PMID: 37790353 PMCID: PMC10542551 DOI: 10.1101/2023.09.21.557549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
Glycans are key to host-pathogen interactions, whereby recognition by the host and immunomodulation by the pathogen can be mediated by carbohydrate binding proteins, such as lectins of the innate immune system, and their glycoconjugate ligands. Previous studies have shown that excretory-secretory products of the porcine nematode parasite Trichuris suis exert immunomodulatory effects in a glycan-dependent manner. To better understand the mechanisms of these interactions, we prepared N-glycans from T. suis and both analyzed their structures and used them to generate a natural glycan microarray. With this array we explored the interactions of glycans with C-type lectins, C-reactive protein and sera from T. suis infected pigs. Glycans containing LacdiNAc and phosphorylcholine-modified glycans were associated with the highest binding by most of these proteins. In-depth analysis revealed not only fucosylated LacdiNAc motifs with and without phosphorylcholine moieties, but phosphorylcholine-modified mannose and N-acetylhexosamine-substituted fucose residues, in the context of maximally tetraantennary N-glycan scaffolds. Furthermore, O-glycans also contained fucosylated motifs. In summary, the glycans of T. suis are recognized by both the innate and adaptive immune systems, and also exhibit species-specific features distinguishing its glycome from those of other nematodes.
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Affiliation(s)
- Barbara Eckmair
- Institut für Biochemie, Department für Chemie, Universität für Bodenkultur, Muthgasse 18, 1190 Wien, Austria
| | - Chao Gao
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, 3 Blackfan Circle, Boston, MA 02115, USA
| | - Akul Y Mehta
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, 3 Blackfan Circle, Boston, MA 02115, USA
| | - Zuzanna Dutkiewicz
- Institut für Biochemie, Department für Chemie, Universität für Bodenkultur, Muthgasse 18, 1190 Wien, Austria
| | - Jorick Vanbeselaere
- Institut für Biochemie, Department für Chemie, Universität für Bodenkultur, Muthgasse 18, 1190 Wien, Austria
| | - Richard D Cummings
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, 3 Blackfan Circle, Boston, MA 02115, USA
| | - Katharina Paschinger
- Institut für Biochemie, Department für Chemie, Universität für Bodenkultur, Muthgasse 18, 1190 Wien, Austria
| | - Iain B H Wilson
- Institut für Biochemie, Department für Chemie, Universität für Bodenkultur, Muthgasse 18, 1190 Wien, Austria
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7
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Cummings RD. Glycosphingolipids in human parasites. FEBS Open Bio 2023; 13:1625-1635. [PMID: 37335950 PMCID: PMC10476572 DOI: 10.1002/2211-5463.13662] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 05/30/2023] [Accepted: 06/16/2023] [Indexed: 06/21/2023] Open
Abstract
Glycosphingolipids (GSLs) are comprised of glycans (oligosaccharides) linked to a lipid containing a sphingosine moiety. They are major membrane components in cells of most animals, and importantly, they also occur in parasitic protozoans and worms that infect people. While the endogenous functions of the GSLs in most parasites are elusive, many of these GSLs are recognized by antibodies in infected human and animal hosts, and thus, their structures, biosynthesis, and functions are of great interest. Such knowledge of GSLs could lead to new drugs and diagnostics for treating infections, as well as novel vaccine strategies. The diversity of GSLs recently identified in such infectious organisms and aspects of their immune recognition are major topics of this review. It is not intended to be exhaustive but to highlight aspects of GSL glycans in human parasites.
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Affiliation(s)
- Richard D. Cummings
- Division of Surgical Sciences, Department of Surgery, Beth Israel Deaconess Medical CenterHarvard Medical SchoolBostonMAUSA
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8
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Zhang Y, Jen FEC, Fox KL, Edwards JL, Jennings MP. The biosynthesis and role of phosphorylcholine in pathogenic and nonpathogenic bacteria. Trends Microbiol 2023; 31:692-706. [PMID: 36863982 PMCID: PMC10272106 DOI: 10.1016/j.tim.2023.01.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 01/18/2023] [Accepted: 01/23/2023] [Indexed: 03/03/2023]
Abstract
Phosphorylcholine (ChoP) can be found in all life forms. Although this molecule was first thought to be uncommon in bacteria, it is now appreciated that many bacteria express ChoP on their surface. ChoP is usually attached to a glycan structure, but in some cases, it is added as a post-translational modification to proteins. Recent findings have demonstrated the role of ChoP modification and phase variation (ON/OFF switching) in bacterial pathogenesis. However, the mechanisms of ChoP synthesis are still unclear in some bacteria. Here, we review the literature and examine the recent developments in ChoP-modified proteins and glycolipids and of ChoP biosynthetic pathways. We discuss how the well-studied Lic1 pathway exclusively mediates ChoP attachment to glycans but not to proteins. Finally, we provide a review of the role of ChoP in bacterial pathobiology and the role of ChoP in modulating the immune response.
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Affiliation(s)
- Yuan Zhang
- Institute for Glycomics, Griffith University, Gold Coast Campus, Southport, QLD 4222, Australia
| | - Freda E-C Jen
- Institute for Glycomics, Griffith University, Gold Coast Campus, Southport, QLD 4222, Australia
| | - Kate L Fox
- School of Chemistry and Molecular Biosciences, The University of Queensland, St Lucia, Brisbane, Queensland 4072, Australia
| | - Jennifer L Edwards
- Center for Microbial Pathogenesis, Abigail Wexner Research Institute at Nationwide Children's Hospital, Columbus, OH 43205, USA; Department of Pediatrics, The Ohio State University, Columbus, OH 43210, USA
| | - Michael P Jennings
- Institute for Glycomics, Griffith University, Gold Coast Campus, Southport, QLD 4222, Australia.
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9
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Harvey DJ. Analysis of carbohydrates and glycoconjugates by matrix-assisted laser desorption/ionization mass spectrometry: An update for 2019-2020. MASS SPECTROMETRY REVIEWS 2022:e21806. [PMID: 36468275 DOI: 10.1002/mas.21806] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
This review is the tenth update of the original article published in 1999 on the application of matrix-assisted laser desorption/ionization (MALDI) mass spectrometry to the analysis of carbohydrates and glycoconjugates and brings coverage of the literature to the end of 2020. Also included are papers that describe methods appropriate to analysis by MALDI, such as sample preparation techniques, even though the ionization method is not MALDI. The review is basically divided into three sections: (1) general aspects such as theory of the MALDI process, matrices, derivatization, MALDI imaging, fragmentation, quantification and the use of arrays. (2) Applications to various structural types such as oligo- and polysaccharides, glycoproteins, glycolipids, glycosides and biopharmaceuticals, and (3) other areas such as medicine, industrial processes and glycan synthesis where MALDI is extensively used. Much of the material relating to applications is presented in tabular form. The reported work shows increasing use of incorporation of new techniques such as ion mobility and the enormous impact that MALDI imaging is having. MALDI, although invented nearly 40 years ago is still an ideal technique for carbohydrate analysis and advancements in the technique and range of applications show little sign of diminishing.
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Affiliation(s)
- David J Harvey
- Nuffield Department of Medicine, Target Discovery Institute, University of Oxford, Oxford, UK
- Department of Chemistry, University of Oxford, Oxford, Oxfordshire, United Kingdom
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10
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Pabst M, Grouzdev DS, Lawson CE, Kleikamp HBC, de Ram C, Louwen R, Lin YM, Lücker S, van Loosdrecht MCM, Laureni M. A general approach to explore prokaryotic protein glycosylation reveals the unique surface layer modulation of an anammox bacterium. THE ISME JOURNAL 2022; 16:346-357. [PMID: 34341504 PMCID: PMC8776859 DOI: 10.1038/s41396-021-01073-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 07/09/2021] [Accepted: 07/19/2021] [Indexed: 02/07/2023]
Abstract
The enormous chemical diversity and strain variability of prokaryotic protein glycosylation makes their large-scale exploration exceptionally challenging. Therefore, despite the universal relevance of protein glycosylation across all domains of life, the understanding of their biological significance and the evolutionary forces shaping oligosaccharide structures remains highly limited. Here, we report on a newly established mass binning glycoproteomics approach that establishes the chemical identity of the carbohydrate components and performs untargeted exploration of prokaryotic oligosaccharides from large-scale proteomics data directly. We demonstrate our approach by exploring an enrichment culture of the globally relevant anaerobic ammonium-oxidizing bacterium Ca. Kuenenia stuttgartiensis. By doing so we resolve a remarkable array of oligosaccharides, which are produced by two seemingly unrelated biosynthetic routes, and which modify the same surface-layer protein simultaneously. More intriguingly, the investigated strain also accomplished modulation of highly specialized sugars, supposedly in response to its energy metabolism-the anaerobic oxidation of ammonium-which depends on the acquisition of substrates of opposite charges. Ultimately, we provide a systematic approach for the compositional exploration of prokaryotic protein glycosylation, and reveal a remarkable example for the evolution of complex oligosaccharides in bacteria.
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Affiliation(s)
- Martin Pabst
- grid.5292.c0000 0001 2097 4740Delft University of Technology, Department of Biotechnology, Delft, The Netherlands
| | | | - Christopher E. Lawson
- grid.184769.50000 0001 2231 4551DOE Joint BioEnergy Institute, Lawrence Berkeley National Laboratory, Emeryville, CA USA
| | - Hugo B. C. Kleikamp
- grid.5292.c0000 0001 2097 4740Delft University of Technology, Department of Biotechnology, Delft, The Netherlands
| | - Carol de Ram
- grid.5292.c0000 0001 2097 4740Delft University of Technology, Department of Biotechnology, Delft, The Netherlands
| | - Rogier Louwen
- grid.5645.2000000040459992XDepartment of Medical Microbiology and Infectious Diseases, Erasmus MC, University Medical Center Rotterdam, Rotterdam, The Netherlands
| | - Yue Mei Lin
- grid.5292.c0000 0001 2097 4740Delft University of Technology, Department of Biotechnology, Delft, The Netherlands
| | - Sebastian Lücker
- grid.5590.90000000122931605Department of Microbiology, IWWR, Radboud University, Nijmegen, the Netherlands
| | - Mark C. M. van Loosdrecht
- grid.5292.c0000 0001 2097 4740Delft University of Technology, Department of Biotechnology, Delft, The Netherlands
| | - Michele Laureni
- grid.5292.c0000 0001 2097 4740Delft University of Technology, Department of Biotechnology, Delft, The Netherlands
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11
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Hensbergen PJ, de Ru AH, Friggen AH, Corver J, Smits WK, van Veelen PA. New insights into the Type A glycan modification of Clostridioides difficile flagellar protein flagellin C by phosphoproteomics analysis. J Biol Chem 2022; 298:101622. [PMID: 35065968 PMCID: PMC8861647 DOI: 10.1016/j.jbc.2022.101622] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2021] [Revised: 01/17/2022] [Accepted: 01/18/2022] [Indexed: 12/16/2022] Open
Abstract
The type A glycan modification found in human pathogen Clostridioides difficile consists of a monosaccharide (GlcNAc) that is linked to an N-methylated threonine through a phosphodiester bond. This structure has previously been described on the flagellar protein flagellin C of several C. difficile strains and is important for bacterial motility. The study of post-translational modifications often relies on some type of enrichment strategy; however, a procedure for enrichment of this modification has not yet been demonstrated. In this study, we show that an approach that is commonly used in phosphoproteomics, Fe3+-immobilized metal affinity chromatography, also enriches for peptides with this unique post-translational modification. Using LC–MS/MS analyses of immobilized metal affinity chromatography–captured tryptic peptides, we observed not only type A-modified C. difficile flagellin peptides but also a variety of truncated/modified type A structures on these peptides. Using an elaborate set of mass spectrometry analyses, we demonstrate that one of these modifications consists of a type A structure containing a phosphonate (2-aminoethylphosphonate), a modification that is rarely observed and has hitherto not been described in C. difficile. In conclusion, we show that a common enrichment strategy results in reliable identification of peptides carrying a type A glycan modification, and that the results obtained can be used to advance models about its biosynthesis.
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Affiliation(s)
- Paul J Hensbergen
- Center for Proteomics and Metabolomics, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands.
| | - Arnoud H de Ru
- Center for Proteomics and Metabolomics, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
| | - Annemieke H Friggen
- Department of Medical Microbiology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
| | - Jeroen Corver
- Department of Medical Microbiology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
| | - Wiep Klaas Smits
- Department of Medical Microbiology, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
| | - Peter A van Veelen
- Center for Proteomics and Metabolomics, Leiden University Medical Center, 2333 ZA Leiden, The Netherlands
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12
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Tseng HC, Hsiao CT, Yamakawa N, Guérardel Y, Khoo KH. Discovery Sulfoglycomics and Identification of the Characteristic Fragment Ions for High-Sensitivity Precise Mapping of Adult Zebrafish Brain-Specific Glycotopes. Front Mol Biosci 2022; 8:771447. [PMID: 34988116 PMCID: PMC8721812 DOI: 10.3389/fmolb.2021.771447] [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: 09/06/2021] [Accepted: 11/17/2021] [Indexed: 11/13/2022] Open
Abstract
Mass spectrometry-based high-sensitivity mapping of terminal glycotopes relies on diagnostic MS2 and/or MS3 ions that can differentiate linkage and define the location of substituents including sulfates. Unambiguous identification of adult zebrafish glycotopes is particularly challenging due to the presence of extra β4-galactosylation on the basic building block of Galβ1-4GlcNAc that can be fucosylated and variably sialylated by N-acetyl, N-glycolyl, or deaminated neuraminic acids. Building on previous groundwork that have identified various organ-specific N- and O-glycans of adult zebrafish, we show here that all the major glycotopes of interest can be readily mapped by direct nano-LC-MS/MS analysis of permethylated glycans. Homing in on the brain-, intestine-, and ovary-derived samples, organ-specific glycomic reference maps based on overlaid extracted ion chromatograms of resolved glycan species, and composite charts of summed intensities of diagnostic MS2 ions representing the distribution and relative abundance of each of the glycotopes and sialic acid variants were established. Moreover, switching to negative mode analysis of sample fractions enriched in negatively charged glycans, we show, for the first time, that a full range of sulfated glycotopes is expressed in adult zebrafish. In particular, 3-O-sulfation of terminal Gal was commonly found, whereas terminal sulfated HexNAc as in GalNAcβ1-4GlcNAc (LacdiNAc), and 3-O-sulfated hexuronic acid as in HNK-1 epitope (SO3-3GlcAβ1-3Galβ1-4GlcNAc) were identified only in the brain and not in the intestine or ovaries analyzed in parallel. Other characteristic structural features of sulfated O- and N-glycans along with their diagnostic ions detected in this discovery mode sulfoglycomic work collectively expand our adult zebrafish glycome atlas, which can now allow for a more complete navigation and probing of the underlying sulfotransferases and glycosyltransferases, in search of the functional relevance of zebrafish-specific glycotopes. Of particular importance is the knowledge of glycomic features distinct from those of humans when using adult zebrafish as an alternative vertebrate model, rather than mouse, for brain-related glyco-neurobiology studies.
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Affiliation(s)
- Huan-Chuan Tseng
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan.,Institute of Biochemical Sciences, National Taiwan University, Taipei, Taiwan
| | - Cheng-Te Hsiao
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan
| | - Nao Yamakawa
- Université de Lille, CNRS, INSERM, CHU Lille, Institut Pasteur de Lille, US 41-UMS 2014-PLBS, Lille, France
| | - Yann Guérardel
- Université de Lille, CNRS, UMR 8576-UGSF - Unité de Glycobiologie Structurale et Fonctionnelle, Lille, France.,Institute for Glyco-core Research (iGCORE), Gifu University, Gifu, Japan
| | - Kay-Hooi Khoo
- Institute of Biological Chemistry, Academia Sinica, Taipei, Taiwan.,Institute of Biochemical Sciences, National Taiwan University, Taipei, Taiwan
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Kim S, Lee J, Oh DB, Kwon O. Marine invertebrate sialyltransferase of the sea squirt Ciona savignyi sialylated core 1 O-linked glycans. Int J Biol Macromol 2022; 194:366-376. [PMID: 34813786 DOI: 10.1016/j.ijbiomac.2021.11.078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 10/01/2021] [Accepted: 11/12/2021] [Indexed: 11/30/2022]
Abstract
An invertebrate sialyltransferase, cST3Gal-I, identified from the sea squirt Ciona savignyi, was functionally characterized in vitro using recombinant enzyme expressed in yeast strains. cST3Gal-I was localized to the Golgi membrane when expressed in Saccharomyces cerevisiae. Enzymatic characterization for substrate specificity and kinetic property indicate that cST3Gal-I prefers O-glycans, rather than N-glycan, of asialoglycoproteins as substrates. Interestingly, C. savignyi sialyltransferase exhibited effectively Neu5Ac transfer to core 1 O-glycan, Gal β(1,3)GalNAc, compared to orthologous human glycosyltransferase. Further, it is shown that cST3Gal-I catalyzes the formation of α(2,3)-linkage, through lectin blot analysis with Maackia amurensis lectin and by linkage-specific sialidase treatments. The putative active sites of cST3Gal-I for putative acid/base catalysts and sialic acid acceptor/donor substrate bindings were also identical to the counterpart residues of a mammalian enzyme, porcine ST3Gal-I, as predicted through homologous structure modeling. These results could imply that an ancestral tunicate ST3Gal-I in C. savignyi would prefer O-glycan onto glycoproteins as its sialic acid acceptor than vertebrate enzymes.
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Affiliation(s)
- Seonghun Kim
- Jeonbuk Branch Institute, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 181 Ipsin-gil, Jeongeup 56212, South Korea; Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, University of Science and Technology (UST), 217 Gajeong-ro, Daejeon 34113, South Korea.
| | - Jinhyuk Lee
- Genome Editing Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 125 Gwahak-ro, Daejeon 34141, South Korea; Department of Bioinformatics, KRIBB School of Bioscience, Korea University of Science and Technology (UST), 217 Gajeong-ro, Daejeon 34113, South Korea
| | - Doo-Byoung Oh
- Environmental Disease Research Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea; Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, University of Science and Technology (UST), 217 Gajeong-ro, Daejeon 34113, South Korea
| | - Ohsuk Kwon
- SME Support Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), Daejeon 34141, South Korea; Department of Biosystems and Bioengineering, KRIBB School of Biotechnology, University of Science and Technology (UST), 217 Gajeong-ro, Daejeon 34113, South Korea
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14
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Petralia LM, van Diepen A, Lokker LA, Nguyen DL, Sartono E, Khatri V, Kalyanasundaram R, Taron CH, Foster JM, Hokke CH. Mass spectrometric and glycan microarray-based characterization of the filarial nematode Brugia malayi glycome reveals anionic and zwitterionic glycan antigens. Mol Cell Proteomics 2022; 21:100201. [PMID: 35065273 PMCID: PMC9046957 DOI: 10.1016/j.mcpro.2022.100201] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 01/03/2022] [Accepted: 01/16/2022] [Indexed: 11/30/2022] Open
Abstract
Millions of people worldwide are infected with filarial nematodes, responsible for lymphatic filariasis (LF) and other diseases causing chronic disablement. Elimination programs have resulted in a substantial reduction of the rate of infection in certain areas creating a need for improved diagnostic tools to establish robust population surveillance and avoid LF resurgence. Glycans from parasitic helminths are emerging as potential antigens for use in diagnostic assays. However, despite its crucial role in host–parasite interactions, filarial glycosylation is still largely, structurally, and functionally uncharacterized. Therefore, we investigated the glycan repertoire of the filarial nematode Brugia malayi. Glycosphingolipid and N-linked glycans were extracted from several life-stages using enzymatic release and characterized using a combination of MALDI-TOF-MS and glycan sequencing techniques. Next, glycans were purified by HPLC and printed onto microarrays to assess the host anti-glycan antibody response. Comprehensive glycomic analysis of B. malayi revealed the presence of several putative antigenic motifs such as phosphorylcholine and terminal glucuronic acid. Glycan microarray screening showed a recognition of most B. malayi glycans by immunoglobulins from rhesus macaques at different time points after infection, which permitted the characterization of the dynamics of anti-glycan immunoglobulin G and M during the establishment of brugian filariasis. A significant level of IgG binding to the parasite glycans was also detected in infected human plasma, while IgG binding to glycans decreased after anthelmintic treatment. Altogether, our work identifies B. malayi glycan antigens and reveals antibody responses from the host that could be exploited as potential markers for LF. Antigenic B. malayi N-linked and GSL glycans were structurally defined. IgG/IgM is induced to a subset of B. malayi glycans upon infection of rhesus macaques. Preferential IgG response to B. malayi glycans observed in chronically infected humans. Marked drop of anti-glycan IgG following treatment of individuals with anthelminthic.
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15
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Mollusc N-glycosylation: Structures, Functions and Perspectives. Biomolecules 2021; 11:biom11121820. [PMID: 34944464 PMCID: PMC8699351 DOI: 10.3390/biom11121820] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/01/2021] [Accepted: 12/01/2021] [Indexed: 12/22/2022] Open
Abstract
Molluscs display a sophisticated N-glycan pattern on their proteins, which is, in terms of involved structural features, even more diverse than that of vertebrates. This review summarises the current knowledge of mollusc N-glycan structures, with a focus on the functional aspects of the corresponding glycoproteins. Furthermore, the potential of mollusc-derived biomolecules for medical applications is addressed, emphasising the importance of mollusc research.
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16
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RHAMM Is a Multifunctional Protein That Regulates Cancer Progression. Int J Mol Sci 2021; 22:ijms221910313. [PMID: 34638654 PMCID: PMC8508827 DOI: 10.3390/ijms221910313] [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: 08/26/2021] [Revised: 09/20/2021] [Accepted: 09/21/2021] [Indexed: 01/09/2023] Open
Abstract
The functional complexity of higher organisms is not easily accounted for by the size of their genomes. Rather, complexity appears to be generated by transcriptional, translational, and post-translational mechanisms and tissue organization that produces a context-dependent response of cells to specific stimuli. One property of gene products that likely increases the ability of cells to respond to stimuli with complexity is the multifunctionality of expressed proteins. Receptor for hyaluronan-mediated motility (RHAMM) is an example of a multifunctional protein that controls differential responses of cells in response-to-injury contexts. Here, we trace its evolution into a sensor-transducer of tissue injury signals in higher organisms through the detection of hyaluronan (HA) that accumulates in injured microenvironments. Our goal is to highlight the domain and isoform structures that generate RHAMM's function complexity and model approaches for targeting its key functions to control cancer progression.
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17
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A mass spectrometry-based glycotope-centric cellular glycomics is the more fruitful way forward to see the forest for the trees. Biochem Soc Trans 2021; 49:55-69. [PMID: 33492355 DOI: 10.1042/bst20190861] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2020] [Revised: 12/18/2020] [Accepted: 12/21/2020] [Indexed: 02/08/2023]
Abstract
The nature of protein glycosylation renders cellular glycomics a very challenging task in having to deal with all the disparate glycans carried on membrane glycoproteins. Rapid mapping by mass spectrometry analysis provides only a coarse sketch of the glycomic complexity based primarily on glycosyl compositions, whereby the missing high-resolution structural details require a combination of multi-mode separations and multi-stages of induced fragmentation to gain sufficiently discriminative precision, often at the expenses of throughput and sensitivity. Given the available technology and foreseeable advances in the near future, homing in on resolving the terminal fucosylated, sialylated and/or sulfated structural units, or glycotopes, maybe a more pragmatic and ultimately more rewarding approach to gain insights into myriad biological processes mediated by these terminal coding units carried on important glycoproteins, to be decoded by a host of endogenous glycan-binding proteins and antibodies. A broad overview of recent technical advances and limitations in cellular glycomics is first provided as a backdrop to the propounded glycotope-centric approach based on advanced nanoLC-MS2/MS3 analysis of permethylated glycans. To prioritize analytical focus on the more tangible glycotopes is akin to first identifying the eye-catching and characteristic-defining flowers and fruits of the glyco-forest, to see the forest for the trees. It has the best prospects of attaining the much-needed balance in sensitivity, structural precision and analytical throughput to match advances in other omics.
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18
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West CM, Malzl D, Hykollari A, Wilson IBH. Glycomics, Glycoproteomics, and Glycogenomics: An Inter-Taxa Evolutionary Perspective. Mol Cell Proteomics 2021; 20:100024. [PMID: 32994314 PMCID: PMC8724618 DOI: 10.1074/mcp.r120.002263] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2020] [Revised: 09/21/2020] [Accepted: 09/28/2020] [Indexed: 12/23/2022] Open
Abstract
Glycosylation is a highly diverse set of co- and posttranslational modifications of proteins. For mammalian glycoproteins, glycosylation is often site-, tissue-, and species-specific and diversified by microheterogeneity. Multitudinous biochemical, cellular, physiological, and organismic effects of their glycans have been revealed, either intrinsic to the carrier proteins or mediated by endogenous reader proteins with carbohydrate recognition domains. Furthermore, glycans frequently form the first line of access by or defense from foreign invaders, and new roles for nucleocytoplasmic glycosylation are blossoming. We now know enough to conclude that the same general principles apply in invertebrate animals and unicellular eukaryotes-different branches of which spawned the plants or fungi and animals. The two major driving forces for exploring the glycomes of invertebrates and protists are (i) to understand the biochemical basis of glycan-driven biology in these organisms, especially of pathogens, and (ii) to uncover the evolutionary relationships between glycans, their biosynthetic enzyme genes, and biological functions for new glycobiological insights. With an emphasis on emerging areas of protist glycobiology, here we offer an overview of glycan diversity and evolution, to promote future access to this treasure trove of glycobiological processes.
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Affiliation(s)
- Christopher M West
- Department of Biochemistry & Molecular Biology, Center for Tropical and Emerging Global Diseases, Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA.
| | - Daniel Malzl
- Department für Chemie, Universität für Bodenkultur, Wien, Austria
| | - Alba Hykollari
- Department für Chemie, Universität für Bodenkultur, Wien, Austria; VetCore Facility for Research/Proteomics Unit, Veterinärmedizinische Universität, Vienna, Austria
| | - Iain B H Wilson
- Department für Chemie, Universität für Bodenkultur, Wien, Austria
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19
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Labrada KP, Strobl S, Eckmair B, Blaukopf M, Dutkiewicz Z, Hykollari A, Malzl D, Paschinger K, Yan S, Wilson IBH, Kosma P. Zwitterionic Phosphodiester-Substituted Neoglycoconjugates as Ligands for Antibodies and Acute Phase Proteins. ACS Chem Biol 2020; 15:369-377. [PMID: 31935056 PMCID: PMC7046318 DOI: 10.1021/acschembio.9b00794] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Zwitterionic modifications of glycans, such as phosphorylcholine and phosphoethanolamine, are known from a range of prokaryotic and eukaryotic species and are recognized by mammalian antibodies and pentraxins; however, defined saccharide ligands modified with these zwitterionic moieties for high-throughput studies are lacking. In this study, we prepared and tested example mono- and disaccharides 6-substituted with either phosphorylcholine or phosphoethanolamine as bovine serum albumin neoglycoconjugates or printed in a microarray format for subsequent assessment of their binding to lectins, pentraxins, and antibodies. C-Reactive protein and anti-phosphorylcholine antibodies bound specifically to ligands with phosphorylcholine, but recognition by concanavalin A was abolished or decreased as compared with that to the corresponding nonzwitterionic compounds. Furthermore, in array format, the phosphorylcholine-modified ligands were recognized by IgG and IgM in sera of either non-infected or nematode-infected dogs and pigs. Thereby, these new compounds are defined ligands which allow the assessment of glycan-bound phosphorylcholine as a target of both the innate and adaptive immune systems in mammals.
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Affiliation(s)
- Karell Pérez Labrada
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Sebastian Strobl
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Barbara Eckmair
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Markus Blaukopf
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Zuzanna Dutkiewicz
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Alba Hykollari
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Daniel Malzl
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Katharina Paschinger
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | | | - Iain B. H. Wilson
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
| | - Paul Kosma
- Department of Chemistry, University of Natural Resources and Life Sciences, Muthgasse 18, A-1190 Vienna, Austria
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20
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Vanbeselaere J, Jin C, Eckmair B, Wilson IBH, Paschinger K. Sulfated and sialylated N-glycans in the echinoderm Holothuria atra reflect its marine habitat and phylogeny. J Biol Chem 2020; 295:3159-3172. [PMID: 31969392 DOI: 10.1074/jbc.ra119.011701] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 01/17/2020] [Indexed: 01/14/2023] Open
Abstract
Among the earliest deuterostomes, the echinoderms are an evolutionary important group of ancient marine animals. Within this phylum, the holothuroids (sea cucumbers) are known to produce a wide range of glycoconjugate biopolymers with apparent benefits to health; therefore, they are of economic and culinary interest throughout the world. Other than their highly modified glycosaminoglycans (e.g. fucosylated chondroitin sulfate and fucoidan), nothing is known about their protein-linked glycosylation. Here we used multistep N-glycan fractionation to efficiently separate anionic and neutral N-glycans before analyzing the N-glycans of the black sea cucumber (Holothuria atra) by MS in combination with enzymatic and chemical treatments. These analyses showed the presence of various fucosylated, phosphorylated, sialylated, and multiply sulfated moieties as modifications of oligomannosidic, hybrid, and complex-type N-glycans. The high degree of sulfation and fucosylation parallels the modifications observed previously on holothuroid glycosaminoglycans. Compatible with its phylogenetic position, H. atra not only expresses vertebrate motifs such as sulfo- and sialyl-Lewis A epitopes but displays a high degree of anionic substitution of its glycans, as observed in other marine invertebrates. Thus, as for other echinoderms, the phylum- and order-specific aspects of this species' N-glycosylation reveal both invertebrate- and vertebrate-like features.
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Affiliation(s)
- Jorick Vanbeselaere
- Department of Chemistry, University of Natural Resources and Life Sciences, 1190 Vienna, Austria
| | - Chunsheng Jin
- Institute of Biomedicine, Sahlgrenska Academy, Göteborg University, 405 30 Göteborg, Sweden
| | - Barbara Eckmair
- Department of Chemistry, University of Natural Resources and Life Sciences, 1190 Vienna, Austria
| | - Iain B H Wilson
- Department of Chemistry, University of Natural Resources and Life Sciences, 1190 Vienna, Austria.
| | - Katharina Paschinger
- Department of Chemistry, University of Natural Resources and Life Sciences, 1190 Vienna, Austria
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21
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Miyazaki T, Miyashita R, Nakamura S, Ikegaya M, Kato T, Park EY. Biochemical characterization and mutational analysis of silkworm Bombyx mori β-1,4-N-acetylgalactosaminyltransferase and insight into the substrate specificity of β-1,4-galactosyltransferase family enzymes. INSECT BIOCHEMISTRY AND MOLECULAR BIOLOGY 2019; 115:103254. [PMID: 31655162 DOI: 10.1016/j.ibmb.2019.103254] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 10/17/2019] [Accepted: 10/17/2019] [Indexed: 06/10/2023]
Abstract
Silkworm Bombyx mori is one of the insect hosts for recombinant protein production at academic and industrial levels. B. mori and other insect cells can produce mammalian proteins with proper posttranslational modifications, such as N-glycosylation, but the structures of N-glycans in B. mori are mainly high mannose- and paucimannose-type, while mammals also produce hybrid- and complex-type glycans. Recently, complex-type N-glycans whose structures are different from mammalian ones have been identified in some insect cell N-glycomes at very low levels compared with levels of high mannose- and paucimannose-type glycans. However, their functions and the enzymes involved in the biosynthesis of insect complex-type N-glycans are not clear, and complex-type N-glycans, except for N-acetylglucosamine-terminated glycans, are still not identified in the B. mori N-glycome. Here, we focused on the β-1,4-galactosyltransferase family (also known as glycosyltransferase family 7, GT7) that contains mammalian β-1,4-galactosyltransferase and insect β-1,4-N-acetylgalactosaminyltransferase. A gene for a GT7 protein (BmGalNAcT) from B. mori was cloned, expressed in a soluble form using a silkworm expression system, and the gene product showed strict β-1,4-N-acetylgalactosaminyltransferase activity but not β-1,4-galactosyltransferase activity. A mutation in Ile298 or Ile310, which are predicted to be located in the active site, reduced its glycosyltransferase activity, suggesting that these residues and the corresponding residues are responsible for substrate specificity of GT7. These results suggested that BmGalNAcT may be involved in the complex-type N-glycans, and moreover, bioinformatics analysis revealed that B. mori might have an extra gene for a GT7 enzyme with different specificity in addition to the known insect GT7 glycosyltransferases.
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Affiliation(s)
- Takatsugu Miyazaki
- Green Chemistry Research Division, Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan; Department of Agriculture, Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
| | - Ryunosuke Miyashita
- Department of Agriculture, Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
| | - Shuntaro Nakamura
- Department of Agriculture, Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
| | - Marina Ikegaya
- Department of Agriculture, Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
| | - Tatsuya Kato
- Green Chemistry Research Division, Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan; Department of Agriculture, Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan
| | - Enoch Y Park
- Green Chemistry Research Division, Research Institute of Green Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan; Department of Agriculture, Graduate School of Integrated Science and Technology, Shizuoka University, 836 Ohya, Suruga-ku, Shizuoka, 422-8529, Japan.
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