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Toul M, Slonkova V, Mican J, Urminsky A, Tomkova M, Sedlak E, Bednar D, Damborsky J, Hernychova L, Prokop Z. Identification, characterization, and engineering of glycosylation in thrombolyticsa. Biotechnol Adv 2023; 66:108174. [PMID: 37182613 DOI: 10.1016/j.biotechadv.2023.108174] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 05/09/2023] [Accepted: 05/09/2023] [Indexed: 05/16/2023]
Abstract
Cardiovascular diseases, such as myocardial infarction, ischemic stroke, and pulmonary embolism, are the most common causes of disability and death worldwide. Blood clot hydrolysis by thrombolytic enzymes and thrombectomy are key clinical interventions. The most widely used thrombolytic enzyme is alteplase, which has been used in clinical practice since 1986. Another clinically used thrombolytic protein is tenecteplase, which has modified epitopes and engineered glycosylation sites, suggesting that carbohydrate modification in thrombolytic enzymes is a viable strategy for their improvement. This comprehensive review summarizes current knowledge on computational and experimental identification of glycosylation sites and glycan identity, together with methods used for their reengineering. Practical examples from previous studies focus on modification of glycosylations in thrombolytics, e.g., alteplase, tenecteplase, reteplase, urokinase, saruplase, and desmoteplase. Collected clinical data on these glycoproteins demonstrate the great potential of this engineering strategy. Outstanding combinatorics originating from multiple glycosylation sites and the vast variety of covalently attached glycan species can be addressed by directed evolution or rational design. Directed evolution pipelines would benefit from more efficient cell-free expression and high-throughput screening assays, while rational design must employ structure prediction by machine learning and in silico characterization by supercomputing. Perspectives on challenges and opportunities for improvement of thrombolytic enzymes by engineering and evolution of protein glycosylation are provided.
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Affiliation(s)
- Martin Toul
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic
| | - Veronika Slonkova
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic
| | - Jan Mican
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic
| | - Adam Urminsky
- Research Centre for Applied Molecular Oncology, Masaryk Memorial Cancer Institute, Zluty kopec 7, 656 53 Brno, Czech Republic
| | - Maria Tomkova
- Center for Interdisciplinary Biosciences, P. J. Safarik University in Kosice, Jesenna 5, 04154 Kosice, Slovakia
| | - Erik Sedlak
- Center for Interdisciplinary Biosciences, P. J. Safarik University in Kosice, Jesenna 5, 04154 Kosice, Slovakia
| | - David Bednar
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic
| | - Jiri Damborsky
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic
| | - Lenka Hernychova
- Research Centre for Applied Molecular Oncology, Masaryk Memorial Cancer Institute, Zluty kopec 7, 656 53 Brno, Czech Republic.
| | - Zbynek Prokop
- Loschmidt Laboratories, Department of Experimental Biology and RECETOX, Faculty of Science, Masaryk University, Kamenice 5/C13, 625 00 Brno, Czech Republic; International Clinical Research Center, St. Anne's University Hospital, Pekarska 53, 656 91 Brno, Czech Republic.
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van Noort K, Nguyen DL, Kriechbaumer V, Hawes C, Hokke CH, Schots A, Wilbers RHP. Functional characterization of Schistosoma mansoni fucosyltransferases in Nicotiana benthamiana plants. Sci Rep 2020; 10:18528. [PMID: 33116178 PMCID: PMC7595089 DOI: 10.1038/s41598-020-74485-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 09/25/2020] [Indexed: 12/13/2022] Open
Abstract
Helminth parasites secrete a wide variety of immunomodulatory proteins and lipids to dampen host immune responses. Many of these immunomodulatory compounds are modified with complex sugar structures (or glycans), which play an important role at the host-parasite interface. As an example, the human blood fluke Schistosoma mansoni produces highly fucosylated glycan structures on glycoproteins and glycolipids. Up to 20 different S. mansoni fucosyltransferase (SmFucT) genes can be found in genome databases, but thus far only one enzyme has been functionally characterized. To unravel the synthesis of highly fucosylated N-glycans by S. mansoni, we examined the ability of ten selected SmFucTs to modify N-glycans upon transient expression in Nicotiana benthamiana plants. All enzymes were localized in the plant Golgi apparatus, which allowed us to identify the SmFucTs involved in core fucosylation and the synthesis of complex antennary glycan motifs. This knowledge provides a starting point for investigations into the role of specific fucosylated glycan motifs of schistosomes in parasite-host interactions. The functionally characterized SmFucTs can also be applied to synthesize complex N-glycan structures on recombinant proteins to study their contribution to immunomodulation. Furthermore, this plant expression system will fuel the development of helminth glycoproteins for pharmaceutical applications or novel anti-helminth vaccines.
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Affiliation(s)
- Kim van Noort
- Laboratory of Nematology, Plant Sciences Group, Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Dieu-Linh Nguyen
- Department of Parasitology, Leiden University Medical Center, Albinusdreef, 2333 ZA, Leiden, The Netherlands
| | - Verena Kriechbaumer
- Department of Biological and Medical Sciences, Oxford Brookes University, Oxford, OX3 0BP, UK
| | - Chris Hawes
- Department of Biological and Medical Sciences, Oxford Brookes University, Oxford, OX3 0BP, UK
| | - Cornelis H Hokke
- Department of Parasitology, Leiden University Medical Center, Albinusdreef, 2333 ZA, Leiden, The Netherlands
| | - Arjen Schots
- Laboratory of Nematology, Plant Sciences Group, Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands
| | - Ruud H P Wilbers
- Laboratory of Nematology, Plant Sciences Group, Wageningen University and Research, Droevendaalsesteeg 1, 6708 PB, Wageningen, The Netherlands.
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Zeng R, Xu Q, Shao XX, Wang KY, Xia QC. Characterization and analysis of a novel glycoprotein from snake venom using liquid chromatography-electrospray mass spectrometry and Edman degradation. EUROPEAN JOURNAL OF BIOCHEMISTRY 1999; 266:352-8. [PMID: 10561575 DOI: 10.1046/j.1432-1327.1999.00859.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
An N-linked glycosylation in a novel C-lectin protein from snake venom was observed by Edman degradation and liquid chromatography-electrospray mass spectrometry. The peptides obtained by trypsin cleavage were analyzed to confirm the amino acid sequence and Asn5 was found to be the N-glycosylation site. The result was further confirmed by N-glycosidase digestion. In addition, the protein and tryptic peptides with and without glycan chain were characterized by mass spectrometry according to the mass difference. The glycopeptide obtained from proteolytic digestion was analyzed and the glycoforms were identified as high-mannose type by tandem MS coupled with alpha-mannosidase digestion. An oxidized Met residue was detected and located in the protein by mass spectrometry.
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Affiliation(s)
- R Zeng
- Shanghai Institute of Biochemistry, Chinese Academy of Sciences, China
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Abstract
Glycoproteins generally exist as populations of glycosylated variants (glycoforms) of a single polypeptide. Although the same glycosylation machinery is available to all proteins that enter the secretory pathway in a given cell, most glycoproteins emerge with characteristic glycosylation patterns and heterogeneous populations of glycans at each glycosylation site. The factors that control the composition of the glycoform populations and the role that heterogeneity plays in the function of glycoproteins are important questions for glycobiology. A full understanding of the implications of glycosylation for the structure and function of a protein can only be reached when a glycoprotein is viewed as a single entity. Individual glycoproteins, by virtue of their unique structures, can selectively control their own glycosylation by modulating interactions with the glycosylating enzymes in the cell. Examples include protein-specific glycosylation within the immunoglobulins and immunoglobulin superfamily and site-specific processing in ribonuclease, Thy-1, IgG, tissue plasminogen activator, and influenza A hemagglutinin. General roles for the range of sugars on glycoproteins such as the leukocyte antigens include orientating the molecules on the cell surface. A major role for specific sugars is in recognition by lectins, including chaperones involved in protein folding. In addition, the recognition of identical motifs in different glycans allows a heterogeneous population of glycoforms to participate in specific biological interactions.
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Affiliation(s)
- P M Rudd
- Department of Biochemistry, University of Oxford, U.K
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Endo T, Wright A, Morrison SL, Kobata A. Glycosylation of the variable region of immunoglobulin G--site specific maturation of the sugar chains. Mol Immunol 1995; 32:931-40. [PMID: 7476998 DOI: 10.1016/0161-5890(95)00078-s] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The structure of the N-linked sugar chains attached to three IgG antibodies, identical in amino acid sequence except for the changes required to introduce the carbohydrate addition sites, has been determined. All three antibodies are specific for dextran but differ in their ability to bind antigen. The heavy chains with a murine variable region (V region) attached to the human gamma 4 constant region were expressed in a murine hybridoma synthesizing the specific light chain. In addition to the glycosylation site in the Fc portion, each antibody has a different glycosylation site in the second complementarity determining region (CDR2) of the heavy chain (Asn54, Asn58, or Asn60). The sugar chains were released from purified Fab and Fc fragments by hydrazinolysis and converted to radioactive oligosaccharides by reduction with sodium borotritide. The structures of these radioactive oligosaccharides were determined by a combination of sequential exoglycosidase digestion and Bio-Gel P-4 and lectin column chromatography. For all three antibodies, the carbohydrate attached to the Fc portion was a mixture of complex-type biantennary sugar chains. The variable region carbohydrate structures attached at Asn54 and Asn58 were also complex-type but more highly sialylated than were the Fc-associated sugars. Moreover, unlike the Fc-associated sugars, a significant population of Fab-associated sugars contained a Gal alpha 1-->3 residue as a non-reducing terminus. In contrast, the carbohydrate attached at Asn60 was a high mannose structure. These results demonstrate that slight changes in the position of carbohydrate attachment within CDR2 of the variable region of the heavy chain can substantially alter carbohydrate processing and that complex-type carbohydrates contained within the same polypeptide chain can have different structures.
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Affiliation(s)
- T Endo
- Department of Biochemistry, University of Tokyo, Japan
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Keyt BA, Paoni NF, Refino CJ, Berleau L, Nguyen H, Chow A, Lai J, Peña L, Pater C, Ogez J. A faster-acting and more potent form of tissue plasminogen activator. Proc Natl Acad Sci U S A 1994; 91:3670-4. [PMID: 8170967 PMCID: PMC43643 DOI: 10.1073/pnas.91.9.3670] [Citation(s) in RCA: 228] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Current treatment with tissue plasminogen activator (tPA) requires an intravenous infusion (1.5-3 h) because the clearance of tPA from the circulation is rapid (t 1/2 approximately 6 min). We have developed a tPA variant, T103N,N117Q, KHRR(296-299)AAAA (TNK-tPA) that has substantially slower in vivo clearance (1.9 vs. 16.1 ml per min per kg for tPA in rabbits) and near-normal fibrin binding and plasma clot lysis activity (87% and 82% compared with wild-type tPA). TNK-tPA exhibits 80-fold higher resistance to plasminogen activator inhibitor 1 than tPA and 14-fold enhanced relative fibrin specificity. In vitro, TNK-tPA is 10-fold more effective at conserving fibrinogen in plasma compared to tPA. Arterial venous shunt models of fibrinolysis in rabbits indicate that TNK-tPA (by bolus) induces 50% lysis in one-third the time required by tPA (by infusion). TNK-tPA is 8- and 13-fold more potent in rabbits than tPA toward whole blood clots and platelet-enriched clots, respectively. TNK-tPA conserves fibrinogen and, because of its slower clearance and normal clot lysis activity, is effective as a thrombolytic agent when given as a bolus at a relatively low dose.
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Affiliation(s)
- B A Keyt
- Department of Cardiovascular Research, Genentech, Inc., South San Francisco, CA 94080
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Abstract
Considerable advances have been made in identifying the factors determining the glycosylation pattern of glycoproteins secreted by mammalian cells. This has allowed a greater appreciation of the way in which recombinant proteins may be glycosylated after expression in a heterologous system. The studies reviewed herein extend the wider view that glycosylation of native and recombinant proteins is a complex event dependent on the protein moiety, the host cell, and also the environment in which transfected cells are cultured. The details of the way in which these factors combine to establish the glycosylation pattern of a secreted protein are now beginning to be unravelled.
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