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Javeed R, Hussain D, Jabeen F, Sajid MS, Fatima B, Ashiq MN, Najam-Ul-Haq M. Apo-H (beta-2-glycoprotein) intact N-glycan analysis by MALDI-TOF-MS using sialic acid derivatization. Anal Bioanal Chem 2021; 413:7441-7449. [PMID: 34686894 DOI: 10.1007/s00216-021-03701-0] [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: 04/04/2021] [Revised: 09/19/2021] [Accepted: 09/27/2021] [Indexed: 10/20/2022]
Abstract
Apo-H is a plasma glycoprotein. Nearly 19% of the molecular weight of this protein is composed of glycans. Up- and down-regulation and structural changes in protein glycans provide diagnostic value for disease detection. Here, an efficient, sensitive, and optimized method is developed for Apo-H N-glycans analysis by MALDI-TOF-MS in positive mode. This bioanalytical method includes sample preparation, sample purification, and detection. An Apo-H enrichment method is developed using standard proteins by anti-Apo-H beads followed by enrichment from plasma samples. SDS-PAGE confirms the Apo-H protein enrichment, which is further verified by LC-MS/MS analysis. The lower ionization efficiency of sialylated glycan hampers their analysis by MALDI-MS. For this, stabilization of sialic acids is done by selective derivatization of carboxyl groups to differentiate between α(2,3)- and α(2,6)-linked sialic acids. Glycans are further purified by HILIC-SPE and analyzed by MALDI-MS. Several branched bi- and tri-antennary glycans with fucosylation and sialylation are identified. The reproducibility of the developed method is tested by analyzing multiple replicates of human plasma, where the same glycans are consistently identified. This method could be applied for the Apo-H glycan profiling of large clinical cohorts for diagnostic purposes.
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Affiliation(s)
- Rabia Javeed
- Division of Analytical Chemistry, Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Dilshad Hussain
- Division of Analytical Chemistry, Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Fahmida Jabeen
- Division of Analytical Chemistry, Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Muhammad Salman Sajid
- Division of Analytical Chemistry, Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Batool Fatima
- Department of Biochemistry, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Muhammad Naeem Ashiq
- Division of Analytical Chemistry, Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan
| | - Muhammad Najam-Ul-Haq
- Division of Analytical Chemistry, Institute of Chemical Sciences, Bahauddin Zakariya University, Multan, 60800, Pakistan.
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2
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Chromatographic Profiling of N-Glycans. Methods Mol Biol 2019. [PMID: 31256374 DOI: 10.1007/978-1-4939-9055-9_6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
Most glycoproteins carry a very heterogeneous mixture of oligosaccharides and even a single glycosylation site of a pure glycoprotein is often heterogeneously glycosylated. The structural diversity of oligosaccharides arises from linkage variants, from differences in the size and number of charges of glycans, and from differences in the monosaccharide composition of glycans. Fortunately, the biosynthetic pathway is subject to certain restrictions, so that structural diversity is limited and amenable to laboratory investigation. Different approaches have been developed to the structural characterization of oligosaccharides, including nuclear magnetic resonance (NMR), mass spectrometry, linkage analysis by gas chromatography-mass spectrometry (GC-MS), sequence analysis using specific exoglycosidases, and others, but a crucial part of these strategies is the separation of the glycan mixture into homogeneous glycan fractions. In this chapter some high-performance liquid chromatography (HPLC) techniques are described for the isolation of oligosaccharides, in particular N-linked glycans.
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Dědová T, Grunow D, Kappert K, Flach D, Tauber R, Blanchard V. The effect of blood sampling and preanalytical processing on human N-glycome. PLoS One 2018; 13:e0200507. [PMID: 29995966 PMCID: PMC6040761 DOI: 10.1371/journal.pone.0200507] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2018] [Accepted: 06/27/2018] [Indexed: 11/19/2022] Open
Abstract
Glycome modulations have been described in the onset and progression of many diseases. Thus, many studies have proposed glycans from blood glycoproteins as disease markers. Astonishingly, little effort has been given unraveling preanalytical conditions potentially influencing glycan analysis prior to blood biomarker studies. In this work, we evaluate for the first time the effect of hemolysis, storage and blood collection, but also influence of various times and temperatures between individual processing steps on the total N-glycome and on a glycan-biomarker score. Venous blood was collected from 10 healthy donors in 11 blood collection tubes with different additives, processed variously to obtain 16 preanalytical variables and N-glycans released from serum or plasma were analyzed by MALDI-TOF-MS and capillary electrophoresis coupled with fluorescence detection (CE-LIF) for the first time. Long time storage of deep frozen samples at -20°C or -80°C exerted only a minor influence on the glycome as demonstrated by CE-LIF. The N-glycome was very stable evidenced by MALDI-TOF when stored at 4°C for at least 48 hours and blood collected in tubes devoid of additives. The glycome was stable upon storage after centrifugation and aliquoting, which is an important information considering future diagnostic applications. Hemolysis, however, negatively correlated with an established glycan score for ovarian cancer, when evaluated by MALDI-TOF-MS measurement by affecting relative intensities of certain glycans, which could lead to false negative / positive results in glycan biomarker studies.
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Affiliation(s)
- Tereza Dědová
- Charité –Universitätsmedizin Berlin, Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Berlin, Germany
- Freie Universität Berlin, Department of Biology, Chemistry and Pharmacy, Berlin, Germany
| | - Detlef Grunow
- Charité –Universitätsmedizin Berlin, Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Berlin, Germany
| | - Kai Kappert
- Charité –Universitätsmedizin Berlin, Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Berlin, Germany
- Center for Cardiovascular Research, German Center for Cardiovascular Research, Charité –Universitätsmedizin Berlin, Berlin, Germany
| | - Dagmar Flach
- Sarstedt AG&Co, Nümbrecht, North Rhine-Westphalia, Germany
| | - Rudolf Tauber
- Charité –Universitätsmedizin Berlin, Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Berlin, Germany
| | - Véronique Blanchard
- Charité –Universitätsmedizin Berlin, Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Berlin, Germany
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Mamedov T, Cicek K, Gulec B, Ungor R, Hasanova G. In vivo production of non-glycosylated recombinant proteins in Nicotiana benthamiana plants by co-expression with Endo-β-N-acetylglucosaminidase H (Endo H) of Streptomyces plicatus. PLoS One 2017; 12:e0183589. [PMID: 28827815 PMCID: PMC5565186 DOI: 10.1371/journal.pone.0183589] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2017] [Accepted: 08/07/2017] [Indexed: 11/29/2022] Open
Abstract
A plant transient expression system, with eukaryotic post-translational modification machinery, offers superior efficiency, scalability, safety, and lower cost over other expression systems. However, due to aberrant N-glycosylation, this expression system may not be a suitable expression platform for proteins not carrying N-linked glycans in the native hosts. Therefore, it is crucial to develop a strategy to produce target proteins in a non-glycosylated form while preserving their native sequence, conformation and biological activity. Previously, we developed a strategy for enzymatic deglycosylation of proteins in planta by co-expressing bacterial peptide-N-glycosidase F (PNGase F). Though PNGase F removes oligosaccharides from glycosylated proteins, in so doing it causes an amino acid change due to the deamidation of asparagine to aspartate in the N-X-S/T site. Endo-β-N-acetylglucosaminidase (EC3.2.1.96, Endo H), another deglycosylating enzyme, catalyzes cleavage between two N-Acetyl-D-glucosamine residues of the chitobiose core of N-linked glycans, leaving a single N-Acetyl-D-glucosamine residue without the concomitant deamidation of asparagine. In this study, a method for in vivo deglycosylation of recombinant proteins in plants by transient co-expression with bacterial Endo H is described for the first time. Endo H was fully active in vivo. and successfully cleaved N-linked glycans from glycoproteins were tested. In addition, unlike the glycosylated form, in vivo Endo H deglycosylated Pfs48/45 was recognized by conformational specific Pfs48/45 monoclonal antibody, in a manner similar to its PNGase F deglycosylated counterpart. Furthermore, the deglycosylated PA83 molecule produced by Endo H showed better stability than a PNGase F deglycosylated counterpart. Thus, an Endo H in vivo deglycosylation approach provides another opportunity to develop vaccine antigens, therapeutic proteins, antibodies, and industrial enzymes.
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Affiliation(s)
- Tarlan Mamedov
- Akdeniz University, Department of Agricultural Biotechnology, Antalya, Turkey
| | - Kader Cicek
- Akdeniz University, Department of Agricultural Biotechnology, Antalya, Turkey
| | - Burcu Gulec
- Akdeniz University, Department of Agricultural Biotechnology, Antalya, Turkey
| | - Rifat Ungor
- Akdeniz University, Department of Agricultural Biotechnology, Antalya, Turkey
| | - Gulnara Hasanova
- Akdeniz University, Department of Agricultural Biotechnology, Antalya, Turkey
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Radke L, Sandig G, Lubitz A, Schließer U, von Horsten HH, Blanchard V, Keil K, Sandig V, Giese C, Hummel M, Hinderlich S, Frohme M. In Vitro Evaluation of Glycoengineered RSV-F in the Human Artificial Lymph Node Reactor. Bioengineering (Basel) 2017; 4:bioengineering4030070. [PMID: 28952549 PMCID: PMC5615316 DOI: 10.3390/bioengineering4030070] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2017] [Revised: 07/27/2017] [Accepted: 08/03/2017] [Indexed: 11/16/2022] Open
Abstract
Subunit vaccines often require adjuvants to elicit sustained immune activity. Here, a method is described to evaluate the efficacy of single vaccine candidates in the preclinical stage based on cytokine and gene expression analysis. As a model, the recombinant human respiratory syncytial virus (RSV) fusion protein (RSV-F) was produced in CHO cells. For comparison, wild-type and glycoengineered, afucosylated RSV-F were established. Both glycoprotein vaccines were tested in a commercial Human Artificial Lymph Node in vitro model (HuALN®). The analysis of six key cytokines in cell culture supernatants showed well-balanced immune responses for the afucosylated RSV-F, while immune response of wild-type RSV-F was more Th1 accentuated. In particular, stronger and specific secretion of interleukin-4 after each round of re-stimulation underlined higher potency and efficacy of the afucosylated vaccine candidate. Comprehensive gene expression analysis by nCounter gene expression assay confirmed the stronger onset of the immunologic reaction in stimulation experiments with the afucosylated vaccine in comparison to wild-type RSV-F and particularly revealed prominent activation of Th17 related genes, innate immunity, and comprehensive activation of humoral immunity. We, therefore, show that our method is suited to distinguish the potency of two vaccine candidates with minor structural differences.
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Affiliation(s)
- Lars Radke
- Molecular Biotechnology and Functional Genomics, Technical University of Applied Sciences Wildau, Hochschulring 1, Wildau 15745, Germany.
- Institute of Pathology, Charitè-University Medicine Berlin, Augustenburger Platz 1, Berlin 13353, Germany.
| | - Grit Sandig
- Laboratory of Biochemistry, Department of Life Sciences and Technology, Beuth University of Applied Sciences, Seestraße 64, Berlin 13347, Germany.
| | - Annika Lubitz
- ProBioGen AG, Goethestraße 54, Berlin 13086, Germany.
| | | | - Hans Henning von Horsten
- Department of Life Science Engineering, HTW Berlin University of Applied Sciences, Wilhelminenhofstraße 75a, Berlin 12459, Germany.
| | - Veronique Blanchard
- Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Charité Medical University Berlin, Augustenburger Platz 1, Berlin 13353, Germany.
| | - Karolin Keil
- Molecular Biotechnology and Functional Genomics, Technical University of Applied Sciences Wildau, Hochschulring 1, Wildau 15745, Germany.
| | - Volker Sandig
- ProBioGen AG, Goethestraße 54, Berlin 13086, Germany.
| | | | - Michael Hummel
- Institute of Pathology, Charitè-University Medicine Berlin, Augustenburger Platz 1, Berlin 13353, Germany.
| | - Stephan Hinderlich
- Laboratory of Biochemistry, Department of Life Sciences and Technology, Beuth University of Applied Sciences, Seestraße 64, Berlin 13347, Germany.
| | - Marcus Frohme
- Molecular Biotechnology and Functional Genomics, Technical University of Applied Sciences Wildau, Hochschulring 1, Wildau 15745, Germany.
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Jiang K, Zhu H, Li L, Guo Y, Gashash E, Ma C, Sun X, Li J, Zhang L, Wang PG. Sialic acid linkage-specific permethylation for improved profiling of protein glycosylation by MALDI-TOF MS. Anal Chim Acta 2017; 981:53-61. [PMID: 28693729 DOI: 10.1016/j.aca.2017.05.029] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 05/13/2017] [Accepted: 05/20/2017] [Indexed: 10/19/2022]
Abstract
Protein glycosylation mediates a wide range of cellular processes, affecting development and disease in mammals. Deciphering the "glycocodes" requires rapid, sensitive and in-depth characterization of diverse glycan structures derived from biological samples. In this study, we described a two-step derivatization strategy termed linkage-specific sialic acid permethylation (SSAP) consisting of dimethylamination and permethylation for the improved profiling of glycosylation by matrix-assisted laser desorption/ionization (MALDI) time-of-fight (TOF) mass spectrometry (MS). High linkage-specificity (∼99%) of SSAP to both the two most common forms of sialic acid, N-acetylneuraminic acid (Neu5Ac) and N-glycolylneuraminic acid (Neu5Gc), permitted direct discrimination of α2,3- and α2,6-linked sialic acids in MALDI-TOF MS. The enhanced intensity (>10-fold) and increased detection limit (>10-fold) of derivatized glycans were valued for sensitive glycomics. Moreover, the good compatibility and reaction efficiency of the two steps of SSAP allowed rapid sample preparation (<2 h), benefiting robust analysis of glycans in a high-throughput manner. The SSAP strategy was further applied to investigate the protein glycosylation of human serum associated with rheumatoid arthritis (RA). It was demonstrated that the relative abundances of individual glycans were different in RA negative and RA positive samples, and meanwhile the RA patient/control ratios of both α2,3- and α2,6-sialylated glycans tended to elevate accompanied with the increase of sialylation. Those findings of the glycosylation changes occurred in human serum protein may contribute to the diagnosis of RA. Herein, SSAP derivatization combined with MALDI-TOF MS exhibits unique advantages for glycomic analysis and shows potential in glycosylation profiling of therapeutic proteins and clinical glycan biomarker discovery.
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Affiliation(s)
- Kuan Jiang
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300353, China; Department of Chemistry, Georgia State University, Atlanta, GA 30303, United States; PerkinElmer, 115 North Taiping Road, Taicang City, Jiangsu Province, China
| | - He Zhu
- Department of Chemistry, Georgia State University, Atlanta, GA 30303, United States
| | - Lei Li
- Department of Chemistry, Georgia State University, Atlanta, GA 30303, United States
| | - Yuxi Guo
- Department of Chemistry, Georgia State University, Atlanta, GA 30303, United States
| | - Ebtesam Gashash
- Department of Chemistry, Georgia State University, Atlanta, GA 30303, United States
| | - Cheng Ma
- Department of Chemistry, Georgia State University, Atlanta, GA 30303, United States
| | - Xiaolin Sun
- Department of Rheumatology & Immunology, Beijing Key Laboratory for Rheumatism and Immune Diagnosis (BZ0135), Peking University People's Hospital, Beijing 100044, China
| | - Jing Li
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300353, China.
| | - Lianwen Zhang
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300353, China.
| | - Peng George Wang
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Tianjin 300353, China; Department of Chemistry, Georgia State University, Atlanta, GA 30303, United States.
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7
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Harvey DJ. Analysis of carbohydrates and glycoconjugates by matrix-assisted laser desorption/ionization mass spectrometry: An update for 2011-2012. MASS SPECTROMETRY REVIEWS 2017; 36:255-422. [PMID: 26270629 DOI: 10.1002/mas.21471] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Accepted: 01/15/2015] [Indexed: 06/04/2023]
Abstract
This review is the seventh update of the original article published in 1999 on the application of MALDI mass spectrometry to the analysis of carbohydrates and glycoconjugates and brings coverage of the literature to the end of 2012. General aspects such as theory of the MALDI process, matrices, derivatization, MALDI imaging, and fragmentation are covered in the first part of the review and applications to various structural types constitute the remainder. The main groups of compound are oligo- and poly-saccharides, glycoproteins, glycolipids, glycosides, and biopharmaceuticals. Much of this material is presented in tabular form. Also discussed are medical and industrial applications of the technique, studies of enzyme reactions, and applications to chemical synthesis. © 2015 Wiley Periodicals, Inc. Mass Spec Rev 36:255-422, 2017.
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Affiliation(s)
- David J Harvey
- Department of Biochemistry, Oxford Glycobiology Institute, University of Oxford, Oxford, OX1 3QU, UK
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Sandig G, von Horsten HH, Radke L, Blanchard V, Frohme M, Giese C, Sandig V, Hinderlich S. Engineering of CHO Cells for the Production of Recombinant Glycoprotein Vaccines with Xylosylated N-glycans. Bioengineering (Basel) 2017; 4:bioengineering4020038. [PMID: 28952517 PMCID: PMC5590453 DOI: 10.3390/bioengineering4020038] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 04/22/2017] [Accepted: 04/24/2017] [Indexed: 11/25/2022] Open
Abstract
Xylose is a general component of O-glycans in mammals. Core-xylosylation of N-glycans is only found in plants and helminth. Consequently, xylosylated N-glycans cause immunological response in humans. We have used the F-protein of the human respiratory syncytial virus (RSV), one of the main causes of respiratory tract infection in infants and elderly, as a model protein for vaccination. The RSV-F protein was expressed in CHO-DG44 cells, which were further modified by co-expression of β1,2-xylosyltransferase from Nicotiana tabacum. Xylosylation of RSV-F N-glycans was shown by monosaccharide analysis and MALDI-TOF mass spectrometry. In immunogenic studies with a human artificial lymph node model, the engineered RSV-F protein revealed improved vaccination efficacy.
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Affiliation(s)
- Grit Sandig
- Laboratory of Biochemistry, Department of Life Sciences and Technology, Beuth University of Applied Sciences Berlin, Seestrasse 64, 13347 Berlin, Germany.
| | - Hans Henning von Horsten
- Department of Life Science Engineering, HTW Berlin University of Applied Sciences, Wilhelminenhofstraße 75a, 12459 Berlin, Germany.
| | - Lars Radke
- Molecular Biotechnology and Functional Genomics, Technical University of Applied Sciences Wildau, Hochschulring 1, 15745 Wildau, Germany.
| | - Véronique Blanchard
- Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Charité Medical University Berlin, Augustenburger Platz 1, 13353 Berlin, Germany.
| | - Marcus Frohme
- Molecular Biotechnology and Functional Genomics, Technical University of Applied Sciences Wildau, Hochschulring 1, 15745 Wildau, Germany.
| | | | - Volker Sandig
- ProBioGen AG, Goethestrasse 54, 13086 Berlin, Germany.
| | - Stephan Hinderlich
- Laboratory of Biochemistry, Department of Life Sciences and Technology, Beuth University of Applied Sciences Berlin, Seestrasse 64, 13347 Berlin, Germany.
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Rosenlöcher J, Sandig G, Kannicht C, Blanchard V, Reinke SO, Hinderlich S. Recombinant glycoproteins: The impact of cell lines and culture conditions on the generation of protein species. J Proteomics 2016; 134:85-92. [DOI: 10.1016/j.jprot.2015.08.011] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Revised: 07/31/2015] [Accepted: 08/18/2015] [Indexed: 10/23/2022]
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Applying Acylated Fucose Analogues to Metabolic Glycoengineering. Bioengineering (Basel) 2015; 2:213-234. [PMID: 28952479 PMCID: PMC5597091 DOI: 10.3390/bioengineering2040213] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2015] [Revised: 11/13/2015] [Accepted: 11/23/2015] [Indexed: 11/25/2022] Open
Abstract
Manipulations of cell surface glycosylation or glycan decoration of selected proteins hold immense potential for exploring structure-activity relations or increasing glycoprotein quality. Metabolic glycoengineering describes the strategy where exogenously supplied sugar analogues intercept biosynthetic pathways and are incorporated into glycoconjugates. Low membrane permeability, which so far limited the large-scale adaption of this technology, can be addressed by the introduction of acylated monosaccharides. In this work, we investigated tetra-O-acetylated, -propanoylated and -polyethylene glycol (PEG)ylated fucoses. Concentrations of up to 500 µM had no substantial effects on viability and recombinant glycoprotein production of human embryonic kidney (HEK)-293T cells. Analogues applied to an engineered Chinese hamster ovary (CHO) cell line with blocked fucose de novo synthesis revealed an increase in cell surface and recombinant antibody fucosylation as proved by lectin blotting, mass spectrometry and monosaccharide analysis. Significant fucose incorporation was achieved for tetra-O-acetylated and -propanoylated fucoses already at 20 µM. Sequential fucosylation of the recombinant glycoprotein, achieved by the application of increasing concentrations of PEGylated fucose up to 70 µM, correlated with a reduced antibody’s binding activity in a Fcγ receptor IIIa (FcγRIIIa) binding assay. Our results provide further insights to modulate fucosylation by exploiting the salvage pathway via metabolic glycoengineering.
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The human rhabdomyosarcoma cell line TE671--Towards an innovative production platform for glycosylated biopharmaceuticals. Protein Expr Purif 2015; 115:83-94. [PMID: 26272370 DOI: 10.1016/j.pep.2015.08.008] [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] [Received: 03/26/2015] [Revised: 08/06/2015] [Accepted: 08/08/2015] [Indexed: 02/03/2023]
Abstract
The market of therapeutic glycoproteins (including coagulation factors, antibodies, cytokines and hormones) is one of the profitable, fast-growing and challenging sectors of the biopharmaceutical industry. Although mammalian cell culture is still expensive and technically complex, the ability to produce desired post-translational modifications, in particular glycosylation, is a major issue. Glycans can influence ligand binding, serum half-life as well as biological activity or product immunogenicity. Aiming to establish a novel production platform for recombinant glycoproteins, the human TE671 cell line was investigated. Since the initial analysis of cell membrane proteins showed a promising glycosylation of TE671 cells for biotechnological purposes, we focused on the recombinant expression of two model glycoproteins of therapeutical relevance. The optimization of the cell transfection procedure and serum-free expression succeeded for the human serine protease inhibitor alpha-1-antitrypsin (A1AT) and the hematopoietic cytokine granulocyte-macrophage colony-stimulating factor (GM-CSF). N-glycan analyses of both purified proteins by matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry provided first fundamental insights into the TE671 glycosylation potential. Besides protein specific pattern, strong distinctions - in particular for N-glycan fucosylation and sialylation - were observed depending on the medium conditions of the respective TE671 cell cultivations. The cell line's ability to synthesize complex and highly sialylated N-glycan structures has been shown. Our results demonstrate the TE671 cell line as a serious alternative to other existing human expression systems.
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Wang F, Wang X, Yu X, Fu L, Liu Y, Ma L, Zhai C. High-level expression of endo-β-N-acetylglucosaminidase H from Streptomyces plicatus in Pichia pastoris and its application for the deglycosylation of glycoproteins. PLoS One 2015; 10:e0120458. [PMID: 25781897 PMCID: PMC4362766 DOI: 10.1371/journal.pone.0120458] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2014] [Accepted: 01/22/2015] [Indexed: 11/22/2022] Open
Abstract
Endo-β-N-acetylglucosaminidase H (Endo H, EC3.2.1.96) is a glycohydrolase that is widely used in the study of glycoproteins. The present study aimed to assess the effect of high-level endo-β-N-acetylglucosaminidase H expression in Pichia pastoris. The DNA coding sequence of this enzyme was optimized based on the codon usage bias of Pichia pastoris and synthesized through overlapping PCR. This novel gene was cloned into a pHBM905A vector and introduced into Pichia pastoris GS115 for secretary expression. The yield of the target protein reached approximately 397 mg/l after a 6-d induction with 1% (v/v) methanol in shake flasks, which is much higher than that observed upon heterologous expression in Escherichia coli and silkworm. This recombinant enzyme was purified and its enzymatic features were studied. Its specific activity was 461573 U/mg. Its optimum pH and temperature were pH 5.5 and 37°C, respectively. Moreover, our study showed that the N-linked glycan side-chains of several recombinant proteins expressed in Pichia pastoris can be efficiently removed through either the co-fermentation of this recombinant strain with strains expressing substrates or by mixing the cell culture supernatants of the endo-β-N-acetylglucosaminidase H expressing strain with strains expressing substrates after fermentation. This is the first report of high-level endo-β-N-acetylglucosaminidase H expression in Pichia pastoris and the application of this enzyme in the deglycosylation of raw glycoproteins heterologously expressed in Pichia pastoris using simplified methods.
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Affiliation(s)
- Fei Wang
- Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan, People’s Republic of China
| | - Xiaojuan Wang
- Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan, People’s Republic of China
| | - Xiaolan Yu
- Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan, People’s Republic of China
| | - Lin Fu
- Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan, People’s Republic of China
| | - Yunyun Liu
- Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan, People’s Republic of China
| | - Lixin Ma
- Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan, People’s Republic of China
- * E-mail: (LM); (CZ)
| | - Chao Zhai
- Hubei Collaborative Innovation Center for Green Transformation of Bio-resources, Hubei Key Laboratory of Industrial Biotechnology, College of Life Sciences, Hubei University, Wuhan, People’s Republic of China
- * E-mail: (LM); (CZ)
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Schwedler C, Kaup M, Weiz S, Hoppe M, Braicu EI, Sehouli J, Hoppe B, Tauber R, Berger M, Blanchard V. Identification of 34 N-glycan isomers in human serum by capillary electrophoresis coupled with laser-induced fluorescence allows improving glycan biomarker discovery. Anal Bioanal Chem 2014; 406:7185-93. [PMID: 25234305 DOI: 10.1007/s00216-014-8168-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Revised: 09/03/2014] [Accepted: 09/05/2014] [Indexed: 02/06/2023]
Abstract
Alterations in glycosylation have been observed in many human diseases and specific changes in glycosylation have been proposed as relevant diagnostic information. Capillary electrophoresis coupled with laser-induced fluorescence (CE-LIF) is a robust method to quantify desialylated N-glycans that are labeled with 8-aminopyrene-1,3,6-trisulfonic acid prior to analysis. To date, only a maximum of 12 glycan structures, the most abundant ones, have been identified by CE-LIF to characterize glycome modulations of total serum in the course of the diseases. In most forms of cancer, findings using CE-LIF were limited to the increase of triantennary structures carrying a Lewis(x) epitope. In this work, we identified 32 linkage and positional glycan isomers in healthy human serum using exoglycosidase digestions as well as standard glycoproteins, for which we report the assignment of novel structures. It was possible to identify and quantify 34 glycan isomers in the serum of primary epithelial ovarian cancer patients (EOC). Reduced levels of diantennary structures and of high-mannose 5 were statistically significant in the EOC samples, and also, elevated branching as well as increased antennary fucosylation were observed. For the first time, we could demonstrate that not only antennary fucosylation was of relevance in tetraantennary structures but also core-fucosylated tetraantennary N-glycans were statistically increased in EOC patients. The results of the current study provide an improved dataset to be used in glycan biomarker discovery.
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Affiliation(s)
- Christian Schwedler
- Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Charité Medical University, Augustenburger Platz 1, 13353, Berlin, Germany
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14
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Expression, Purification, and Characterization of Endo-β-N-Acetylglucosaminidase H Using Baculovirus-Mediated Silkworm Protein Expression System. Appl Biochem Biotechnol 2014; 172:3978-88. [DOI: 10.1007/s12010-014-0814-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2013] [Accepted: 02/14/2014] [Indexed: 10/25/2022]
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15
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Hamouda H, Ullah M, Berger M, Sittinger M, Tauber R, Ringe J, Blanchard V. N-glycosylation profile of undifferentiated and adipogenically differentiated human bone marrow mesenchymal stem cells: towards a next generation of stem cell markers. Stem Cells Dev 2013; 22:3100-13. [PMID: 23829188 DOI: 10.1089/scd.2013.0108] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Mesenchymal stem cells (MSCs) are multipotent cells that are easy to isolate and expand, develop into several tissues, including fat, migrate to diseased organs, have immunosuppressive properties and secrete regenerative factors. This makes MSCs ideal for regenerative medicine. For application and regulatory purposes, knowledge of (bio)markers characterizing MSCs and their development stages is of paramount importance. The cell surface is coated with glycans that possess lineage-specific nature, which makes glycans to be promising candidate markers. In the context of soft tissue generation, we aimed to identify glycans that could be markers for MSCs and their adipogenically differentiated progeny. MSCs were isolated from human bone marrow, adipogenically stimulated for 15 days and adipogenesis was verified by staining the lipid droplets and quantitative real time polymerase chain reaction of the marker genes peroxisome proliferator-activated receptor gamma (PPARG) and fatty acid binding protein-4 (FABP4). Using matrix-assisted laser desorption-ionization-time of flight mass spectrometry combined with exoglycosidase digestions, we report for the first time the N-glycome of MSCs during adipogenic differentiation. We were able to detect more than 100 different N-glycans, including high-mannose, hybrid, and complex N-glycans, as well as poly-N-acetyllactosamine chains. Adipogenesis was accompanied by an increased amount of biantennary fucosylated structures, decreased amount of fucosylated, afucosylated tri- and tetraantennary structures and increased sialylation. N-glycans H6N5F1 and H7N6F1 were significantly overexpressed in undifferentiated MSCs while H3N4F1 and H5N4F3 were upregulated in adipogenically differentiated MSCs. These glycan structures are promising candidate markers to detect and distinguish MSCs and their adipogenic progeny.
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Affiliation(s)
- Houda Hamouda
- 1 Institute of Laboratory Medicine, Clinical Chemistry and Pathobiochemistry, Charité-Universitätsmedizin Berlin , Berlin, Germany
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16
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Mittermayr S, Bones J, Guttman A. Unraveling the Glyco-Puzzle: Glycan Structure Identification by Capillary Electrophoresis. Anal Chem 2013; 85:4228-38. [DOI: 10.1021/ac4006099] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Stefan Mittermayr
- Horváth
Laboratory of
Bioseparation Sciences, Regional Center for Molecular Medicine, University of Debrecen, Debrecen, Hungary
| | - Jonathan Bones
- NIBRT−The National Institute for Bioprocessing Research and Training, Fosters Avenue, Mount Merrion, Blackrock, Co. Dublin, Ireland
| | - András Guttman
- Horváth
Laboratory of
Bioseparation Sciences, Regional Center for Molecular Medicine, University of Debrecen, Debrecen, Hungary
- MTA-PE Translational Glycomics
Group, University of Pannonia, Veszprem,
Hungary
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17
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Frisch E, Schwedler C, Kaup M, Iona Braicu E, Gröne J, Lauscher JC, Sehouli J, Zimmermann M, Tauber R, Berger M, Blanchard V. Endo-β-N-acetylglucosaminidase H de-N-glycosylation in a domestic microwave oven: Application to biomarker discovery. Anal Biochem 2013; 433:65-9. [DOI: 10.1016/j.ab.2012.10.015] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 10/05/2012] [Accepted: 10/11/2012] [Indexed: 11/29/2022]
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18
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Lazar IM, Lee W, Lazar AC. Glycoproteomics on the rise: established methods, advanced techniques, sophisticated biological applications. Electrophoresis 2012; 34:113-25. [PMID: 23161435 DOI: 10.1002/elps.201200445] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2012] [Revised: 10/07/2012] [Accepted: 10/07/2012] [Indexed: 02/05/2023]
Abstract
Glycosylation is the most complex form of protein PTMs. Affected proteins may carry dozens of glycosylation sites with tens to hundreds of glycan residues attached to every site. Glycosylated proteins have many important functions in biology, from cellular to organismal levels, being involved in cell-cell signaling, cell adhesion, immune response, host-pathogen interactions, and development and growth. Glycosylation, however, expands the biological functional diversity of proteins at the expense of a tremendous increase in structural heterogeneity. Aberrant glycosylation of cell surface proteins, as well as their detectable fingerprint in plasma samples, has been associated with cancer, inflammatory and degenerative diseases, and congenital disorders of glycosylation. Therefore, there are on-going efforts directed toward developing new technologies and approaches for glycan sequencing and high-throughput analysis of glycosylated proteins in complex samples with simultaneous characterization of both the protein and glycan moieties. This work is aimed primarily at pinpointing the challenges associated with the large-scale analysis of glycoproteins and the latest developments in glycoproteomic research, with focus on recent advancements (2011-2012) in microcolumn separations and MS detection.
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Affiliation(s)
- Iulia M Lazar
- Department of Biological Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.
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Adamczyk B, Struwe WB, Ercan A, Nigrovic PA, Rudd PM. Characterization of fibrinogen glycosylation and its importance for serum/plasma N-glycome analysis. J Proteome Res 2012; 12:444-54. [PMID: 23151259 DOI: 10.1021/pr300813h] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The majority of proteins present in human serum/plasma are glycoproteins, validating this fluid as an ideal starting material for N-glycan analysis and discovery of potential biomarkers. The glycoprotein content for both serum and plasma is very similar, except for proteins removed in the coagulation process, including fibrinogen. Our aim was to characterize fibrinogen glycosylation in order to determine its contribution to differences between serum and plasma N-glycomes. N-Glycans from human fibrinogen were released, labeled, and analyzed by HILIC-HPLC and MS. Structural characterization of fibrinogen subunits revealed that the α chain was not N-glycosylated, whereas β and γ contained identical oligosaccharide structures, mainly biantennary digalactosylated monosialylated structures (A2G2S1) and biantennary digalactosylated disialylated structures (A2G2S2). Blood was collected from five healthy volunteers into four testing tubes: silicone-coated glass for serum and EDTA, Na-heparin, and Li-heparin glass tubes for plasma. N-Glycans were analyzed using the high-throughput HILIC-HPLC method. N-Glycan profiles from serum and plasma samples differed largely in glycans identified in fibrinogen, suggesting that this glycoprotein represents a major factor distinguishing these body fluids. This result emphasizes the important of consistent body fluid collection practices in biomarker discovery studies.
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Affiliation(s)
- Barbara Adamczyk
- NIBRT Dublin-Oxford Glycobiology Laboratory, National Institute for Bioprocessing Research and Training, Fosters Avenue, Mount Merrion, Blackrock, Co Dublin, Ireland
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