1
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Cao C, Cheng Y, Zheng Y, Huang B, Guo Z, Yu L, Mulloy B, Tajadura-Ortega V, Chai W, Yan J, Liang X. Isolation of Human Milk Difucosyl Nona- and Decasaccharides by Ultrahigh-Temperature Preparative PGC-HPLC and Identification of Novel Difucosylated Heptaose and Octaose Backbones by Negative-Ion ESI-MS n. Anal Chem 2024; 96:6170-6179. [PMID: 38616610 PMCID: PMC11044106 DOI: 10.1021/acs.analchem.3c05008] [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: 11/06/2023] [Revised: 03/11/2024] [Accepted: 04/07/2024] [Indexed: 04/16/2024]
Abstract
Despite their many important physiological functions, past work on the diverse sequences of human milk oligosaccharides (HMOs) has been focused mainly on the highly abundant HMOs with a relatively low degree of polymerization (DP) due to the lack of efficient methods for separation/purification and high-sensitivity sequencing of large-sized HMOs with DP ≥ 10. Here we established an ultrahigh-temperature preparative HPLC based on a porous graphitized carbon column at up to 145 °C to overcome the anomeric α/β splitting problem and developed further the negative-ion ESI-CID-MS/MS into multistage MSn using a combined product-ion scanning of singly charged molecular ion and doubly charged fragment ion of the branching Gal and adjacent GlcNAc residues. The separation and sequencing method allows efficient separation of a neutral fraction with DP ≥ 10 into 70 components, among which 17 isomeric difucosylated nona- and decasaccharides were further purified and sequenced. As a result, novel branched difucosyl heptaose and octaose backbones were unambiguously identified in addition to the conventional linear and branched octaose backbones. The novel structures of difucosylated DF-novo-heptaose, DF-novo-LNO I, and DF-novo-LNnO I were corroborated by NMR. The various fucose-containing Lewis epitopes identified on different backbones were confirmed by oligosaccharide microarray analysis.
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Affiliation(s)
- Cuiyan Cao
- Dalian
Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory
of Separation Science for Analytical Chemistry, Dalian 116023, China
| | - Yiming Cheng
- Jiangxi
Provincial Key Laboratory for Pharmacodynamic Material Basis of Traditional
Chinese Medicine, Ganjiang Chinese Medicine Innovation Center, Nanchang 330000, China
| | - Yi Zheng
- Dalian
Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory
of Separation Science for Analytical Chemistry, Dalian 116023, China
| | - Beibei Huang
- Jiangxi
Provincial Key Laboratory for Pharmacodynamic Material Basis of Traditional
Chinese Medicine, Ganjiang Chinese Medicine Innovation Center, Nanchang 330000, China
| | - Zhimou Guo
- Dalian
Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory
of Separation Science for Analytical Chemistry, Dalian 116023, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Long Yu
- Dalian
Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory
of Separation Science for Analytical Chemistry, Dalian 116023, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Barbara Mulloy
- Glycosciences
Laboratory, Faculty of Medicine, Imperial
College London, Hammersmith Campus, London W12 0NN, United Kingdom
| | - Virginia Tajadura-Ortega
- Glycosciences
Laboratory, Faculty of Medicine, Imperial
College London, Hammersmith Campus, London W12 0NN, United Kingdom
| | - Wengang Chai
- Glycosciences
Laboratory, Faculty of Medicine, Imperial
College London, Hammersmith Campus, London W12 0NN, United Kingdom
| | - Jingyu Yan
- Dalian
Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory
of Separation Science for Analytical Chemistry, Dalian 116023, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
| | - Xinmiao Liang
- Dalian
Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory
of Separation Science for Analytical Chemistry, Dalian 116023, China
- University
of Chinese Academy of Sciences, Beijing 100049, China
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2
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Wang H, Zhang M, Huo Y, Cui X, He R, Han B, Wang Z, Song Y, Lv X, Zhang J, Ge W. Comprehensive investigation of milk oligosaccharides in different mammalian species and the effect of breed and lactation period on sheep milk oligosaccharides. Food Res Int 2023; 172:113132. [PMID: 37689897 DOI: 10.1016/j.foodres.2023.113132] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 06/09/2023] [Accepted: 06/10/2023] [Indexed: 09/11/2023]
Abstract
Milk oligosaccharides (MOs) have unique health benefits for newborns, and MOs are important components in mammalian milk. The present study was conducted to provide a comprehensive analysis of MOs in important domestic animals, including goats, cows, camels and sheep. The comparison with human MOs was conducted simultaneously. Furthermore, analysis of the relative abundance of sheep MOs among different breeds (Hu sheep, East Friesen sheep, East Friesen-Hu crossbred sheep) and lactation periods (colostrum, mature milk) was performed. In general, 35, 24 19, 26, and 16 MOs were identified in human, goat, bovine, camel and sheep milk, respectively. The type of sheep MOs was not greatly influenced by the breeds and lactation period. Hu sheep colostrum had the highest abundance of MOs among six sheep milks, followed by East Friesen sheep colostrum, while East Friesen-Hu crossbred sheep mature milk had the lowest abundance of MOs. These findings provide evidence for the potential value of MOs from domestic animal milk for the commercial applications.
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Affiliation(s)
- Haiyan Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; Shaanxi Engineering Research Centre of Dairy Products Quality, Safety and Health, Yangling 712100, China
| | - Minghui Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; Shaanxi Engineering Research Centre of Dairy Products Quality, Safety and Health, Yangling 712100, China
| | - Yucui Huo
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; Shaanxi Engineering Research Centre of Dairy Products Quality, Safety and Health, Yangling 712100, China
| | - Xiuxiu Cui
- Xi'an Baiyue Goat Dairy Group Co., Ltd, Yanliang 710089, China
| | - Rui He
- Shaanxi Baiyue Youlishi Dairy Co., Ltd, Xi'an 710000, China
| | - Bei Han
- School of Public Health, Xi'an Jiaotong University Health Science Center, Xi'an 710000, China
| | - Zhongfu Wang
- The College of Life Sciences, Northwest University, Xi'an 710069, China
| | - Yuxuan Song
- College of Animal Science and Technology, Northwest A&F University, Yangling 712100, China
| | - Xin Lv
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; Shaanxi Engineering Research Centre of Dairy Products Quality, Safety and Health, Yangling 712100, China
| | - Jing Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; Shaanxi Engineering Research Centre of Dairy Products Quality, Safety and Health, Yangling 712100, China.
| | - Wupeng Ge
- College of Food Science and Engineering, Northwest A&F University, Yangling 712100, China; Shaanxi Engineering Research Centre of Dairy Products Quality, Safety and Health, Yangling 712100, China.
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3
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Bansal P, Ben Faleh A, Warnke S, Rizzo TR. Multistage Ion Mobility Spectrometry Combined with Infrared Spectroscopy for Glycan Analysis. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2023; 34:695-700. [PMID: 36881006 PMCID: PMC10080682 DOI: 10.1021/jasms.2c00361] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Revised: 02/17/2023] [Accepted: 02/22/2023] [Indexed: 05/26/2023]
Abstract
The structural complexity of glycans makes their characterization challenging, not only because of the presence of various isomeric forms of the precursor molecule but also because the fragments can themselves be isomeric. We have recently developed an IMS-CID-IMS approach using structures for lossless ion manipulations (SLIM) combined with cryogenic infrared (IR) spectroscopy for glycan analysis. It allows mobility separation and collision-induced dissociation of a precursor glycan followed by mobility separation and IR spectroscopy of the fragments. While this approach holds great promise for glycan analysis, we often encounter fragments for which we have no standards to identify their spectroscopic fingerprint. In this work, we perform proof-of-principle experiments employing a multistage SLIM-based IMS-CID technique to generate second-generation fragments, followed by their mobility separation and spectroscopic interrogation. This approach provides detailed structural information about the first-generation fragments, including their anomeric form, which in turn can be used to identify the precursor glycan.
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Affiliation(s)
| | | | | | - Thomas R. Rizzo
- Laboratoire
de Chimie Physique Moléculaire, EPFL SB ISIC LCPM, École Polytechnique Fédérale
de Lausanne, Station 6, CH-1015 Lausanne, Switzerland
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4
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Amoah E, Kulyk DS, Callam CS, Hadad CM, Badu-Tawiah AK. Mass Spectrometry Approach for Differentiation of Positional Isomers of Saccharides: Toward Direct Analysis of Rare Sugars. Anal Chem 2023; 95:5635-5642. [PMID: 36947664 PMCID: PMC10696529 DOI: 10.1021/acs.analchem.2c05375] [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] [Indexed: 03/24/2023]
Abstract
Rare sugars have gained popularity in recent years due to their use in antiaging treatments, their ability to sweeten with few calories, and their ability to heal infections. Rare sugars are found in small quantities in nature, and they exist typically as isomeric forms of traditional sugars, rendering some challenges in their isolation, synthesis, and characterization. In this work, we present the first direct mass spectrometric approach for differentiating structural isomers of sucrose that differ only by their glycosidic linkages. The method employed a noncontact nanoelectrospray (nESI) platform capable of analyzing minuscule volumes (5 μL) of saccharides via the formation of halide adducts ([M+X]-; X = Cl and Br). Tandem mass spectrometry analysis of the five structural isomers of sucrose afforded diagnostic fragment ions that can be used to distinguish each isomer. Detailed mechanisms showcasing the distinct fragmentation pattern for each isomer are discussed. The method was applied to characterize and confirm the presence of all five selected rare sugars in raw honey complex samples. Aside from the five natural α isomers of sucrose, the method was also suitable for differentiating some β isomers of the same glycosidic linkages, provided the monomeric sugar units are different. The halide adduct formation via the noncontact nESI source was also proven to be effective for oligosaccharides such as raffinose, β-cyclodextrin, and maltoheptaose. The results from this study encourage the future development of methods that function with simple operation to enable straightforward characterization of small quantities of rare sugars.
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Affiliation(s)
- Enoch Amoah
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Dmytro S. Kulyk
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Christopher S. Callam
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Christopher M. Hadad
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
| | - Abraham K. Badu-Tawiah
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH 43210, USA
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5
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Hořejší K, Jin C, Vaňková Z, Jirásko R, Strouhal O, Melichar B, Teneberg S, Holčapek M. Comprehensive characterization of complex glycosphingolipids in human pancreatic cancer tissues. J Biol Chem 2023; 299:102923. [PMID: 36681125 PMCID: PMC9976472 DOI: 10.1016/j.jbc.2023.102923] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2022] [Revised: 01/03/2023] [Accepted: 01/04/2023] [Indexed: 01/20/2023] Open
Abstract
Pancreatic ductal adenocarcinoma (PDAC) is one of the most common causes of cancer-related deaths worldwide, accounting for 90% of primary pancreatic tumors with an average 5-year survival rate of less than 10%. PDAC exhibits aggressive biology, which, together with late detection, results in most PDAC patients presenting with unresectable, locally advanced, or metastatic disease. In-depth lipid profiling and screening of potential biomarkers currently appear to be a promising approach for early detection of PDAC or other cancers. Here, we isolated and characterized complex glycosphingolipids (GSL) from normal and tumor pancreatic tissues of patients with PDAC using a combination of TLC, chemical staining, carbohydrate-recognized ligand-binding assay, and LC/ESI-MS2. The major neutral GSL identified were GSL with the terminal blood groups A, B, H, Lea, Leb, Lex, Ley, P1, and PX2 determinants together with globo- (Gb3 and Gb4) and neolacto-series GSL (nLc4 and nLc6). We also revealed that the neutral GSL profiles and their relative amounts differ between normal and tumor tissues. Additionally, the normal and tumor pancreatic tissues differ in type 1/2 core chains. Sulfatides and GM3 gangliosides were the predominant acidic GSL along with the minor sialyl-nLc4/nLc6 and sialyl-Lea/Lex. The comprehensive analysis of GSL in human PDAC tissues extends the GSL coverage and provides an important platform for further studies of GSL alterations; therefore, it could contribute to the development of new biomarkers and therapeutic approaches.
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Affiliation(s)
- Karel Hořejší
- University of Pardubice, Faculty of Chemical Technology, Department of Analytical Chemistry, , Pardubice, Czech Republic; University of South Bohemia in České Budějovice, Faculty of Science, Department of Chemistry, České Budějovice, Czech Republic
| | - Chunsheng Jin
- University of Gothenburg, Sahlgrenska Academy, Proteomics Core Facility, Göteborg, Sweden
| | - Zuzana Vaňková
- University of Pardubice, Faculty of Chemical Technology, Department of Analytical Chemistry, , Pardubice, Czech Republic
| | - Robert Jirásko
- University of Pardubice, Faculty of Chemical Technology, Department of Analytical Chemistry, , Pardubice, Czech Republic
| | - Ondřej Strouhal
- Palacký University Olomouc, Faculty of Medicine and Dentistryand University Hospital, Department of Oncology, Olomouc, Czech Republic
| | - Bohuslav Melichar
- Palacký University Olomouc, Faculty of Medicine and Dentistryand University Hospital, Department of Oncology, Olomouc, Czech Republic
| | - Susann Teneberg
- University of Gothenburg, Sahlgrenska Academy, Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology, Göteborg, Sweden.
| | - Michal Holčapek
- University of Pardubice, Faculty of Chemical Technology, Department of Analytical Chemistry, , Pardubice, Czech Republic.
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6
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Huang C, Hou M, Yan J, Wang H, Wang Y, Cao C, Wang Y, Gao H, Ma X, Zheng Y, Bu D, Chai W, Li Y, Sun S. GIPS-Mix for Accurate Identification of Isomeric Components in Glycan Mixtures Using Intelligent Group-Opting Strategy. Anal Chem 2022; 95:811-819. [PMID: 36547394 PMCID: PMC9850354 DOI: 10.1021/acs.analchem.2c02978] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Accurate identification of glycan structures is highly desirable as they are intimately linked to their different functions. However, glycan samples generally exist as mixtures with multiple isomeric structures, making assignment of individual glycan components very challenging, even with the aid of multistage mass spectrometry (MSn). Here, we present an approach, GIPS-mix, for assignment of isomeric glycans within a mixture using an intelligent group-opting strategy. Our approach enumerates all possible combinations (groupings) of candidate glycans and opts in the best-matched glycan group(s) based on the similarity between the simulated spectra of each glycan group and the acquired experimental spectra of the mixture. In the case that a single group could not be elected, a tie break is performed by additional MSn scanning using intelligently selected precursors. With 11 standard mixtures and 6 human milk oligosaccharide fractions, we demonstrate the application of GIPS-mix in assignment of individual glycans in mixtures with high accuracy and efficiency.
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Affiliation(s)
- Chuncui Huang
- Institute
of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing100101, China
| | - Meijie Hou
- Key
Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6 Kexueyuan South Road, Beijing100080, China,University
of Chinese Academy of Sciences, 19 Yuquan Road, Beijing100049, China
| | - Jingyu Yan
- Dalian
Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory of Separation Science
for Analytical Chemistry, Dalian116023, China
| | - Hui Wang
- Key
Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6 Kexueyuan South Road, Beijing100080, China,University
of Chinese Academy of Sciences, 19 Yuquan Road, Beijing100049, China
| | - Yu Wang
- Key
Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6 Kexueyuan South Road, Beijing100080, China,University
of Chinese Academy of Sciences, 19 Yuquan Road, Beijing100049, China
| | - Cuiyan Cao
- Dalian
Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory of Separation Science
for Analytical Chemistry, Dalian116023, China
| | - Yaojun Wang
- College
of Information and Electrical Engineering, China Agricultural University, Beijing100083, China
| | - Huanyu Gao
- Institute
of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing100101, China
| | - Xinyue Ma
- Institute
of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing100101, China,University
of Chinese Academy of Sciences, 19 Yuquan Road, Beijing100049, China
| | - Yi Zheng
- Dalian
Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory of Separation Science
for Analytical Chemistry, Dalian116023, China
| | - Dongbo Bu
- Key
Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6 Kexueyuan South Road, Beijing100080, China,University
of Chinese Academy of Sciences, 19 Yuquan Road, Beijing100049, China
| | - Wengang Chai
- Glycosciences
Laboratory, Department of Medicine, Imperial
College London, LondonW12 0NN, United Kingdom,
| | - Yan Li
- Institute
of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing100101, China,University
of Chinese Academy of Sciences, 19 Yuquan Road, Beijing100049, China,
| | - Shiwei Sun
- Key
Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6 Kexueyuan South Road, Beijing100080, China,University
of Chinese Academy of Sciences, 19 Yuquan Road, Beijing100049, China,
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7
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Li J, Bi Y, Zheng Y, Cao C, Yu L, Yang Z, Chai W, Yan J, Lai J, Liang X. Development of high-throughput UPLC-MS/MS using multiple reaction monitoring for quantitation of complex human milk oligosaccharides and application to large population survey of secretor status and Lewis blood group. Food Chem 2022; 397:133750. [PMID: 35882165 DOI: 10.1016/j.foodchem.2022.133750] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 06/17/2022] [Accepted: 07/18/2022] [Indexed: 11/04/2022]
Abstract
Human milk oligosaccharides (HMOs) have attracted increasing attention due to the emerging evidence of their positive roles for infant's health. A high-throughput method for absolute quantitation of the complex HMOs including multiple isomeric structures is important but very challenging, due to the highly divers nature and wide variation in content of HMOs from different individuals. Here we used UPLC-MS-MRM in the negative-ion mode for accurate quantitation of 23 complex HMOs in just 15 min. The selected oligosaccharides are in their native forms and include neutral and sialylated, fucosylated and non-fucosylated, linear and branched, and secretor and Lewis phenotype indicators. The well validated method with good sensitivity, recovery and reproducibility was then applied to a large population quantitative survey of 251 Chinese mothers from five different ethnic groups (Han, Zhuang, Hui, Mongolian and Tibetan) living in different geographical regions for their secretor's status and Lewis phenotypes.
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Affiliation(s)
- Jiaqi Li
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory of Separation Science for Analytical Chemistry, Dalian 116023, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Ye Bi
- National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Yi Zheng
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory of Separation Science for Analytical Chemistry, Dalian 116023, China
| | - Cuiyan Cao
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory of Separation Science for Analytical Chemistry, Dalian 116023, China
| | - Long Yu
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory of Separation Science for Analytical Chemistry, Dalian 116023, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zhenyu Yang
- National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Wengang Chai
- Glycosciences Laboratory, Faculty of Medicine, Imperial College London, Hammersmith Campus, London, W12 0NN, United Kingdom
| | - Jingyu Yan
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory of Separation Science for Analytical Chemistry, Dalian 116023, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| | - Jianqiang Lai
- National Institute for Nutrition and Health, Chinese Center for Disease Control and Prevention, Beijing, China.
| | - Xinmiao Liang
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory of Separation Science for Analytical Chemistry, Dalian 116023, China; University of Chinese Academy of Sciences, Beijing 100049, China.
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8
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Lang Y, Zhang Y, Wang C, Huang L, Liu X, Song N, Li G, Yu G. Comparison of Different Labeling Techniques for the LC-MS Profiling of Human Milk Oligosaccharides. Front Chem 2021; 9:691299. [PMID: 34589467 PMCID: PMC8473617 DOI: 10.3389/fchem.2021.691299] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Accepted: 08/16/2021] [Indexed: 11/22/2022] Open
Abstract
Human milk oligosaccharides (HMOs) exhibit various biological activities for infants, such as serving as prebiotics, blocking pathogens, and aiding in brain development. HMOs are a complex mixture of hetero-oligosaccharides that are generally highly branched, containing multiple structural isomers and no intrinsic chromophores, presenting a challenge to both their resolution and quantitative detection. While liquid chromatography-mass spectrometry (LC-MS) has become the primary strategy for analysis of various compounds, the very polar and chromophore-free properties of native glycans hinder their separation in LC and ionization in MS. Various labeling approaches have been developed to achieve separation of glycans with higher resolution and greater sensitivity of detection. Here, we compared five commonly used labeling techniques [by 2-aminobenzamide, 2-aminopyridine, 2-aminobenzoic acid (2-AA), 2,6-diaminopyridine, and 1-phenyl-3-methyl-5-pyrazolone] for analyzing HMOs specifically under hydrophilic-interaction chromatography-mass spectrometry (HILIC-MS) conditions. The 2-AA labeling showed the most consistent deprotonated molecular ions, the enhanced sensitivity with the least structural selectivity, and the sequencing-informative tandem MS fragmentation spectra for the widest range of HMOs; therefore, this labeling technique was selected for further optimization under the porous graphitized carbon chromatography-mass spectrometry (PGC-MS) conditions. The combination strategy of 2-AA labeling and PGC-MS techniques provided online decontamination (removal of excess 2-AA, salts, and lactose) and resolute detection of many HMOs, enabling us to characterize the profiles of complicated HMO mixtures comprehensively in a simple protocol.
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Affiliation(s)
- Yinzhi Lang
- Key Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
| | - Yongzhen Zhang
- Key Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
| | - Chen Wang
- Key Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
| | - Limei Huang
- Key Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
| | - Xiaoxiao Liu
- Key Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
| | - Ni Song
- Key Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China
| | - Guoyun Li
- Key Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China.,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
| | - Guangli Yu
- Key Laboratory of Marine Drugs, Ministry of Education, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China, Qingdao, China.,Laboratory for Marine Drugs and Bioproducts, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China
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9
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Gao C, Stavenhagen K, Eckmair B, McKitrick TR, Mehta AY, Matsumoto Y, McQuillan AM, Hanes MS, Eris D, Baker KJ, Jia N, Wei M, Heimburg-Molinaro J, Ernst B, Cummings RD. Differential recognition of oligomannose isomers by glycan-binding proteins involved in innate and adaptive immunity. SCIENCE ADVANCES 2021; 7:7/24/eabf6834. [PMID: 34108208 PMCID: PMC8189592 DOI: 10.1126/sciadv.abf6834] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 04/21/2021] [Indexed: 05/07/2023]
Abstract
The recognition of oligomannose-type glycans in innate and adaptive immunity is elusive due to multiple closely related isomeric glycan structures. To explore the functions of oligomannoses, we developed a multifaceted approach combining mass spectrometry assignments of oligomannose substructures and the development of a comprehensive oligomannose microarray. This defined microarray encompasses both linear and branched glycans, varying in linkages, branching patterns, and phosphorylation status. With this resource, we identified unique recognition of oligomannose motifs by innate immune receptors, including DC-SIGN, L-SIGN, Dectin-2, and Langerin, broadly neutralizing antibodies against HIV gp120, N-acetylglucosamine-1-phosphotransferase, and the bacterial adhesin FimH. The results demonstrate that each protein exhibits a unique specificity to oligomannose motifs and suggest the potential to rationally design inhibitors to selectively block these protein-glycan interactions.
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Affiliation(s)
- Chao Gao
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
| | - Kathrin Stavenhagen
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Barbara Eckmair
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
- Department of Chemistry, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Tanya R McKitrick
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Akul Y Mehta
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Yasuyuki Matsumoto
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Alyssa M McQuillan
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Melinda S Hanes
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Deniz Eris
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Kelly J Baker
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Nan Jia
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Mohui Wei
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Jamie Heimburg-Molinaro
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA
| | - Beat Ernst
- Department of Pharmaceutical Sciences, University of Basel, Klingelbergstrasse 50, CH-4056 Basel, Switzerland
| | - Richard D Cummings
- Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
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10
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Wang QC, Wei M, Yue Y, Wu N, Wang J, Zhang Q. Structural characterization and immunostimulatory activity in vitro of a glycogen from sea urchin-Strongylocentyotus internedius. Carbohydr Polym 2021; 258:117701. [PMID: 33593572 DOI: 10.1016/j.carbpol.2021.117701] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Revised: 01/06/2021] [Accepted: 01/22/2021] [Indexed: 01/19/2023]
Abstract
Sea urchin possesses both high nutritional and medicinal value. It contains diverse biological active polysaccharides. But there are few studies on its glycogen. In the current study, a glucan (MSGA) was separated from Strongylocentyotus internedius and purified by ion exchange and gel filtration column. Chemical analysis revealed that MSGA with 2.65 × 107 Da is made up entirely of glucose. The analysis of methylation, NMR and mass spectrum demonstrated that MSGA is a highly branched glycogen with α-(1→4) linked gluconic backbone and branched at C-6 (one branch per five residues). In addition, MSGA showed good in vitro immunostimulatory activity via NF-κB and MAPKs pathways. It is considered that high degree of branching is necessary for its activity. However, the relationship between structure and immunostimulatory activity of natural glycogens is difficult to elucidate because the difference in their structural properties. Therefore, much more research is needed in this area.
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Affiliation(s)
- Qing-Chi Wang
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Lab for Marine Biology and Biotechnology, Qingdao National Lab for Marine Sci. and Tech, Qingdao, 266071, China; Department of Earth Science, University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China
| | - Maosheng Wei
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Lab for Marine Biology and Biotechnology, Qingdao National Lab for Marine Sci. and Tech, Qingdao, 266071, China; Department of Earth Science, University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China
| | - Yang Yue
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Lab for Marine Biology and Biotechnology, Qingdao National Lab for Marine Sci. and Tech, Qingdao, 266071, China; Department of Earth Science, University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China
| | - Ning Wu
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Lab for Marine Biology and Biotechnology, Qingdao National Lab for Marine Sci. and Tech, Qingdao, 266071, China; Department of Earth Science, University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China
| | - Jing Wang
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Lab for Marine Biology and Biotechnology, Qingdao National Lab for Marine Sci. and Tech, Qingdao, 266071, China; Department of Earth Science, University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China
| | - Quanbin Zhang
- Key Laboratory of Experimental Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China; Lab for Marine Biology and Biotechnology, Qingdao National Lab for Marine Sci. and Tech, Qingdao, 266071, China; Department of Earth Science, University of Chinese Academy of Sciences, Beijing, 100049, China; Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao, 266071, China.
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11
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Harvey DJ. NEGATIVE ION MASS SPECTROMETRY FOR THE ANALYSIS OF N-LINKED GLYCANS. MASS SPECTROMETRY REVIEWS 2020; 39:586-679. [PMID: 32329121 DOI: 10.1002/mas.21622] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2019] [Revised: 12/13/2019] [Accepted: 12/22/2019] [Indexed: 05/03/2023]
Abstract
N-glycans from glycoproteins are complex, branched structures whose structural determination presents many analytical problems. Mass spectrometry, usually conducted in positive ion mode, often requires extensive sample manipulation, usually by derivatization such as permethylation, to provide the necessary structure-revealing fragment ions. The newer but, so far, lesser used negative ion techniques, on the contrary, provide a wealth of structural information not present in positive ion spectra that greatly simplify the analysis of these compounds and can usually be conducted without the need for derivatization. This review describes the use of negative ion mass spectrometry for the structural analysis of N-linked glycans and emphasises the many advantages that can be gained by this mode of operation. Biosynthesis and structures of the compounds are described followed by methods for release of the glycans from the protein. Methods for ionization are discussed with emphasis on matrix-assisted laser desorption/ionization (MALDI) and methods for producing negative ions from neutral compounds. Acidic glycans naturally give deprotonated species under most ionization conditions. Fragmentation of negative ions is discussed next with particular reference to those ions that are diagnostic for specific features such as the branching topology of the glycans and substitution positions of moieties such as fucose and sulfate, features that are often difficult to identify easily by conventional techniques such as positive ion fragmentation and exoglycosidase digestions. The advantages of negative over positive ions for this structural work are emphasised with an example of a series of glycans where all other methods failed to produce a structure. Fragmentation of derivatized glycans is discussed next, both with respect to derivatives at the reducing terminus of the molecules, and to methods for neutralization of the acidic groups on sialic acids to both stabilize them for MALDI analysis and to produce the diagnostic fragments seen with the neutral glycans. The use of ion mobility, combined with conventional mass spectrometry is described with emphasis on its use to extract clean glycan spectra both before and after fragmentation, to separate isomers and its use to extract additional information from separated fragment ions. A section on applications follows with examples of the identification of novel structures from lower organisms and tables listing the use of negative ions for structural identification of specific glycoproteins, glycans from viruses and uses in the biopharmaceutical industry and in medicine. The review concludes with a summary of the advantages and disadvantages of the technique. © 2020 John Wiley & Sons Ltd. Mass Spec Rev.
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Affiliation(s)
- David J Harvey
- Nuffield Department of Medicine, Target Discovery Institute, Roosevelt Drive, Oxford, OX3 7FZ, United Kingdom
- Centre for Biological Sciences, Faculty of Natural and Environmental Sciences, University of Southampton, Life Sciences Building 85, Highfield Campus, Southampton, SO17 1BJ, United Kingdom
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12
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Madar Johansson M, Bélurier E, Papageorgiou AC, Sundin AP, Rahkila J, Kallonen T, Nilsson UJ, Maatsola S, Nyholm TKM, Käpylä J, Corander J, Leino R, Finne J, Teneberg S, Haataja S. The binding mechanism of the virulence factor Streptococcus suis adhesin P subtype to globotetraosylceramide is associated with systemic disease. J Biol Chem 2020; 295:14305-14324. [PMID: 32796033 DOI: 10.1074/jbc.ra120.014818] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 08/11/2020] [Indexed: 11/06/2022] Open
Abstract
Streptococcus suis is part of the pig commensal microbiome but strains can also be pathogenic, causing pneumonia and meningitis in pigs as well as zoonotic meningitis. According to genomic analysis, S. suis is divided into asymptomatic carriage, respiratory and systemic strains with distinct genomic signatures. Because the strategies to target pathogenic S. suis are limited, new therapeutic approaches are needed. The virulence factor S. suis adhesin P (SadP) recognizes the galabiose Galα1-4Gal-oligosaccharide. Based on its oligosaccharide fine specificity, SadP can be divided into subtypes PN and PO We show here that subtype PN is distributed in the systemic strains causing meningitis, whereas type PO is found in asymptomatic carriage and respiratory strains. Both types of SadP are shown to predominantly bind to pig lung globotriaosylceramide (Gb3). However, SadP adhesin from systemic subtype PN strains also binds to globotetraosylceramide (Gb4). Mutagenesis studies of the galabiose-binding domain of type PN SadP adhesin showed that the amino acid asparagine 285, which is replaced by an aspartate residue in type PO SadP, was required for binding to Gb4 and, strikingly, was also required for interaction with the glycomimetic inhibitor phenylurea-galabiose. Molecular dynamics simulations provided insight into the role of Asn-285 for Gb4 and phenylurea-galabiose binding, suggesting additional hydrogen bonding to terminal GalNAc of Gb4 and the urea group. Thus, the Asn-285-mediated molecular mechanism of type PN SadP binding to Gb4 could be used to selectively target S. suis in systemic disease without interfering with commensal strains, opening up new avenues for interventional strategies against this pathogen.
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Affiliation(s)
- Miralda Madar Johansson
- Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Eva Bélurier
- Institute of Biomedicine, Research Center for Cancer, Infections and Immunity, University of Turku, Turku, Finland
| | | | - Anders P Sundin
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Lund, Sweden
| | - Jani Rahkila
- Instrument Centre, Åbo Akademi University, Turku, Finland
| | - Teemu Kallonen
- Department of Biostatistics, University of Oslo, Blindern, Norway.,Department of Clinical Microbiology, Turku University Hospital, Turku, Finland.,Parasites and Microbes, Wellcome Sanger Institute, Cambridge, United Kingdom
| | - Ulf J Nilsson
- Centre for Analysis and Synthesis, Department of Chemistry, Lund University, Lund, Sweden
| | - Santeri Maatsola
- Institute of Biomedicine, Research Center for Cancer, Infections and Immunity, University of Turku, Turku, Finland
| | - Thomas K M Nyholm
- Biochemistry Faculty of Science and Engineering, Åbo Akademi University, Turku, Finland
| | - Jarmo Käpylä
- Department of Biochemistry, University of Turku, Turku, Finland
| | - Jukka Corander
- Department of Biostatistics, University of Oslo, Blindern, Norway.,Parasites and Microbes, Wellcome Sanger Institute, Cambridge, United Kingdom.,Helsinki Institute for Information Technology (HIIT), Department of Mathematics and Statistics, University of Helsinki, Finland
| | - Reko Leino
- Laboratory of Molecular Science and Technology, Åbo Akademi University, Turku, Finland
| | - Jukka Finne
- Molecular and Integrative Biosciences Research Programme, Faculty of Biological and Environmental Sciences, University of Helsinki, Helsinki, Finland
| | - Susann Teneberg
- Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
| | - Sauli Haataja
- Institute of Biomedicine, Research Center for Cancer, Infections and Immunity, University of Turku, Turku, Finland
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13
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Identification of carbohydrate peripheral epitopes important for recognition by positive-ion MALDI multistage mass spectrometry. Carbohydr Polym 2020; 229:115528. [DOI: 10.1016/j.carbpol.2019.115528] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2019] [Revised: 10/08/2019] [Accepted: 10/22/2019] [Indexed: 11/22/2022]
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14
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Huang C, Yan J, Zhan L, Zhao M, Zhou J, Gao H, Xie W, Li Y, Chai W. Linkage and sequence analysis of neutral oligosaccharides by negative-ion MALDI tandem mass spectrometry with laser-induced dissociation. Anal Chim Acta 2019; 1071:25-35. [PMID: 31128752 DOI: 10.1016/j.aca.2019.04.067] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Revised: 04/23/2019] [Accepted: 04/27/2019] [Indexed: 11/25/2022]
Abstract
Mass spectrometry (MS) has become the primary method for high-sensitivity structural determination of oligosaccharides. Fragmentation in the negative-ion MS can provide a wealth of structural information and these can be used for sequence determination. However, although negative-ion MS of neutral oligosaccharide using the deprotonated molecule [M-H]- as the precursor has been very successful for electrospray ionization (ESI), it has only limited success for matrix-assisted laser desorption/ionization (MALDI). In the present study, the features of negative-ion MALDI primary spectra were investigated in detail and the product-ion spectra using [M-H]- and [M+Cl]- as the precursors were carefully compared. The formation of [M-H]- was the main difficulty for MALDI while [M+Cl]- was proved to be useful as alternative precursor anion for MALDI-MS/MS to produce similar fragmentation for sequencing of neutral oligosaccharides. N-(1-naphthyl)ethylenediamine dihydrochloride was then used as both the matrix and the Cl- dopant to evaluate the extent of structural information that can be obtained by negative-ion fragmentation from [M+Cl]- using laser-induced dissociation (LID)-MS/MS for linkage assignment of gluco-oligosaccharides and for typing of blood-group ABO(H) and Lewis antigens on either type 1 or type 2 backbone-chains.
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Affiliation(s)
- Chuncui Huang
- Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China; GuangDong Bio-healtech Advanced, Foshan, 528315, China
| | - Jingyu Yan
- Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Key Laboratory of Separation Science for Analytical Chemistry, Dalian, 116023, China
| | - Lingpeng Zhan
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China; Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China
| | - Min Zhao
- Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China
| | - Jinyu Zhou
- Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China
| | - Huanyu Gao
- Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China
| | - Wenchun Xie
- Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China; GuangDong Bio-healtech Advanced, Foshan, 528315, China
| | - Yan Li
- Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing, 100101, China; University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing, 100049, China.
| | - Wengang Chai
- Glycosciences Laboratory, Faculty of Medicine, Imperial College London, Hammersmith Campus, London, W12 0NN, UK
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15
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Synthesis of N-glycyl-β-glycopyranosylamines, derivatives of main human secreted oligosaccharide core structures. Russ Chem Bull 2019. [DOI: 10.1007/s11172-019-2401-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Juvonen M, Kotiranta M, Jokela J, Tuomainen P, Tenkanen M. Identification and structural analysis of cereal arabinoxylan-derived oligosaccharides by negative ionization HILIC-MS/MS. Food Chem 2019; 275:176-185. [DOI: 10.1016/j.foodchem.2018.09.074] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2018] [Revised: 09/07/2018] [Accepted: 09/11/2018] [Indexed: 12/30/2022]
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17
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Mucha E, Stuckmann A, Marianski M, Struwe WB, Meijer G, Pagel K. In-depth structural analysis of glycans in the gas phase. Chem Sci 2019; 10:1272-1284. [PMID: 30809341 PMCID: PMC6357860 DOI: 10.1039/c8sc05426f] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 01/04/2019] [Indexed: 12/26/2022] Open
Abstract
Although there have been substantial improvements in glycan analysis over the past decade, the lack of both high-resolution and high-throughput methods hampers progress in glycomics. This perspective article highlights the current developments of liquid chromatography, mass spectrometry, ion-mobility spectrometry and cryogenic IR spectroscopy for glycan analysis and gives a critical insight to their individual strengths and limitations. Moreover, we discuss a novel concept in which ion mobility-mass spectrometry and cryogenic IR spectroscopy is combined in a single instrument such that datasets consisting of m/z, collision cross sections and IR fingerprints can be obtained. This multidimensional data will then be compared to a comprehensive reference library of intact glycans and their fragments to accurately identify unknown glycans on a high-throughput scale with minimal sample requirements. Due to the complementarity of the obtained information, this novel approach is highly diagnostic and also suitable for the identification of larger glycans; however, the workflow and instrumentation is straightforward enough to be implemented into a user-friendly setup.
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Affiliation(s)
- Eike Mucha
- Fritz Haber Institute of the Max Planck Society , Department of Molecular Physics , Faradayweg 4-6 , 14195 Berlin , Germany . .,Institute of Chemistry and Biochemistry , Freie Universität Berlin , Takustraße 3 , 14195 Berlin , Germany
| | - Alexandra Stuckmann
- Fritz Haber Institute of the Max Planck Society , Department of Molecular Physics , Faradayweg 4-6 , 14195 Berlin , Germany . .,Institute of Chemistry and Biochemistry , Freie Universität Berlin , Takustraße 3 , 14195 Berlin , Germany
| | - Mateusz Marianski
- Fritz Haber Institute of the Max Planck Society , Department of Molecular Physics , Faradayweg 4-6 , 14195 Berlin , Germany .
| | - Weston B Struwe
- Oxford Glycobiology Institute , Department of Biochemistry , University of Oxford , OX1 3QU Oxford , UK
| | - Gerard Meijer
- Fritz Haber Institute of the Max Planck Society , Department of Molecular Physics , Faradayweg 4-6 , 14195 Berlin , Germany .
| | - Kevin Pagel
- Fritz Haber Institute of the Max Planck Society , Department of Molecular Physics , Faradayweg 4-6 , 14195 Berlin , Germany . .,Institute of Chemistry and Biochemistry , Freie Universität Berlin , Takustraße 3 , 14195 Berlin , Germany
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18
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Sun S, Huang C, Wang Y, Liu Y, Zhang J, Zhou J, Gao F, Yang F, Chen R, Mulloy B, Chai W, Li Y, Bu D. Toward Automated Identification of Glycan Branching Patterns Using Multistage Mass Spectrometry with Intelligent Precursor Selection. Anal Chem 2018; 90:14412-14422. [DOI: 10.1021/acs.analchem.8b03967] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Shiwei Sun
- Key Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6 Kexueyuan South Road, Beijing 100080, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Chuncui Huang
- Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing 100101, China
| | - Yaojun Wang
- Key Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6 Kexueyuan South Road, Beijing 100080, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Yaming Liu
- Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing 100101, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Jingwei Zhang
- Key Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6 Kexueyuan South Road, Beijing 100080, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Jinyu Zhou
- Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing 100101, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Feng Gao
- Key Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6 Kexueyuan South Road, Beijing 100080, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Fei Yang
- Key Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6 Kexueyuan South Road, Beijing 100080, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Runsheng Chen
- Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing 100101, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Barbara Mulloy
- Glycosciences Laboratory, Faculty of Medicine, Imperial College London, London W12 0NN, United Kingdom
| | - Wengang Chai
- Glycosciences Laboratory, Faculty of Medicine, Imperial College London, London W12 0NN, United Kingdom
| | - Yan Li
- Institute of Biophysics, Chinese Academy of Sciences, 15 Datun Road, Beijing 100101, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
| | - Dongbo Bu
- Key Laboratory of Intelligent Information Processing, Institute of Computing Technology, Chinese Academy of Sciences, 6 Kexueyuan South Road, Beijing 100080, China
- University of Chinese Academy of Sciences, 19 Yuquan Road, Beijing 100049, China
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19
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Breimer ME, Säljö K, Barone A, Teneberg S. Glycosphingolipids of human embryonic stem cells. Glycoconj J 2017; 34:713-723. [PMID: 27325407 PMCID: PMC5711972 DOI: 10.1007/s10719-016-9706-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Revised: 06/10/2016] [Accepted: 06/12/2016] [Indexed: 12/31/2022]
Abstract
The application of human stem cell technology offers theoretically a great potential to treat various human diseases. However, to achieve this goal a large number of scientific issues remain to be solved. Cell surface carbohydrate antigens are involved in a number of biomedical phenomena that are important in clinical applications of stem cells, such as cell differentiation and immune reactivity. Due to their cell surface localization, carbohydrate epitopes are ideally suited for characterization of human pluripotent stem cells. Amongst the most commonly used markers to identify human pluripotent stem cells are the globo-series glycosphingolipids SSEA-3 and SSEA-4. However, our knowledge regarding human pluripotent stem cell glycosphingolipid expression was until recently mainly based on immunological assays of intact cells due to the very limited amounts of cell material available. In recent years the knowledge regarding glycosphingolipids in human embryonic stem cells has been extended by biochemical studies, which is the focus of this review. In addition, the distribution of the human pluripotent stem cell glycosphingolipids in human tissues, and glycosphingolipid changes during human stem cell differentiation, are discussed.
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Affiliation(s)
- Michael E Breimer
- Institute of Clinical Sciences, Department of Surgery, Sahlgrenska Academy at University of Gothenburg, Göteborg, Sweden
| | - Karin Säljö
- Institute of Clinical Sciences, Department of Surgery, Sahlgrenska Academy at University of Gothenburg, Göteborg, Sweden
| | - Angela Barone
- Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology, Sahlgrenska Academy at University of Gothenburg, P.O. Box 440, S-405 30, Göteborg, Sweden
| | - Susann Teneberg
- Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology, Sahlgrenska Academy at University of Gothenburg, P.O. Box 440, S-405 30, Göteborg, Sweden.
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20
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Calvano CD, Cataldi TRI, Kögel JF, Monopoli A, Palmisano F, Sundermeyer J. Structural Characterization of Neutral Saccharides by Negative Ion MALDI Mass Spectrometry Using a Superbasic Proton Sponge as Deprotonating Matrix. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2017; 28:1666-1675. [PMID: 28466430 DOI: 10.1007/s13361-017-1679-y] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 03/22/2017] [Accepted: 03/29/2017] [Indexed: 05/22/2023]
Abstract
The superbasic proton sponge 1,8-bis(tripyrrolidinylphosphazenyl)naphthalene (TPPN) has been successfully employed for the structural characterization of neutral saccharides, cyclodextrins, and saccharide alditols by matrix assisted laser desorption/ionization tandem mass spectrometry (MALDI-MS/MS). Owing to its inherently high basicity, TPPN is capable of deprotonating neutral carbohydrates (M) providing an efficient and simple way to produce gas-phase [M - H]- ions. Highly informative negative ions MS/MS spectra showing several diagnostic fragment ions were obtained, mainly A-type cross-ring and C-type glycosidic cleavages. Indeed, cross-ring cleavages of monosaccharides with formation of 0,2A, 0,3A, 2,4A, 2,5A, 3,5A, and 0,3X product ions dominate the MS/MS spectra. A significant difference between reducing (e.g., lactose, maltose) and non-reducing disaccharides (e.g., sucrose, trehalose) was observed. Though disaccharides with the anomeric positions blocked give rise to deprotonated molecules, [M - H]-, at m/z 341.1, reducing ones exhibited a peak at m/z 340.1, most likely as radical anion, [M - H•- H]-•. The superiority of TPPN was clearly demonstrated by comparison with well recognized matrices, such as 2,5-dihydroxybenzoic acid and 2',4',6'-trihydroxyacetophenone (positive ion mode) and nor-harman (negative ion mode). MALDI MS/MS experiments on isotopically labeled sugars have greatly supported the interpretation of plausible fragmentation pathways. Graphical Abstract ᅟ.
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Affiliation(s)
- Cosima Damiana Calvano
- Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, via Orabona 4, 70126, Bari, Italy.
- Centro di Ricerca Interdipartimentale SMART, Università degli Studi di Bari Aldo Moro, via Orabona 4, 70126, Bari, Italy.
| | - Tommaso R I Cataldi
- Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, via Orabona 4, 70126, Bari, Italy
- Centro di Ricerca Interdipartimentale SMART, Università degli Studi di Bari Aldo Moro, via Orabona 4, 70126, Bari, Italy
| | - Julius F Kögel
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032, Marburg, Germany
- FB Biologie/Chemie, Universität Bremen, Leobener Str. im NW2, 28359, Bremen, Germany
| | - Antonio Monopoli
- Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, via Orabona 4, 70126, Bari, Italy
| | - Francesco Palmisano
- Dipartimento di Chimica, Università degli Studi di Bari Aldo Moro, via Orabona 4, 70126, Bari, Italy
- Centro di Ricerca Interdipartimentale SMART, Università degli Studi di Bari Aldo Moro, via Orabona 4, 70126, Bari, Italy
| | - Jorge Sundermeyer
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße, 35032, Marburg, Germany
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21
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Briggs MT, Ho YY, Kaur G, Oehler MK, Everest-Dass AV, Packer NH, Hoffmann P. N-Glycan matrix-assisted laser desorption/ionization mass spectrometry imaging protocol for formalin-fixed paraffin-embedded tissues. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2017; 31:825-841. [PMID: 28271569 DOI: 10.1002/rcm.7845] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 02/21/2017] [Accepted: 02/23/2017] [Indexed: 06/06/2023]
Abstract
RATIONALE Matrix-assisted laser desorption/ionization mass spectrometry imaging (MALDI-MSI) of the proteome of a tissue has been an established technique for the past decade. In the last few years, MALDI-MSI of the N-glycome has emerged as a novel MALDI-MSI technique. To assess the accuracy and clinical significance of the N-linked glycan spatial distribution, we have developed a method that utilises MALDI-MSI followed by liquid chromatography coupled to tandem mass spectrometry (LC/MS/MS) in order to assign glycan structures to the differentiating MALDI-MSI glycan masses released from the tissue glycoproteins. METHODS AND RESULTS Our workflow presents a comprehensive list of instructions on how to (i) apply MALDI-MSI to spatially map the N-glycome across formalin-fixed paraffin-embedded (FFPE) clinical samples, (ii) structurally characterise N-glycans extracted from consecutive FFPE tissue sections by LC/MS/MS, and (iii) match relevant N-glycan masses from MALDI-MSI with confirmed N-glycan structures determined by LC/MS/MS. CONCLUSIONS Our protocol provides groups that are new to this technique with instructions how to establish N-glycan MALDI-MSI in their laboratory. Furthermore, the method assigns N-glycan structural detail to the masses obtained in the MALDI-MS image. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- Matthew T Briggs
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, Australia, 5005
- Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, Adelaide, Australia, 5005
| | - Yin Ying Ho
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, Australia, 5005
| | - Gurjeet Kaur
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia, Pulau Pinang, Malaysia
| | - Martin K Oehler
- Department of Gynaecological Oncology, Royal Adelaide Hospital, Adelaide, South Australia, 5005, Australia
- Robinson Institute, University of Adelaide, Adelaide, Australia, 5005
| | - Arun V Everest-Dass
- ARC Centre for Nanoscale BioPhotonics (CNBP), University of Adelaide, Adelaide, Australia, 5005
- Biomolecular Frontiers Research Centre, Macquarie University, Sydney, Australia, 2109
| | - Nicolle H Packer
- ARC Centre for Nanoscale BioPhotonics (CNBP), University of Adelaide, Adelaide, Australia, 5005
- Biomolecular Frontiers Research Centre, Macquarie University, Sydney, Australia, 2109
| | - Peter Hoffmann
- Adelaide Proteomics Centre, School of Biological Sciences, University of Adelaide, Adelaide, Australia, 5005
- Institute for Photonics and Advanced Sensing (IPAS), University of Adelaide, Adelaide, Australia, 5005
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22
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Zou G, Benktander JD, Gizaw ST, Gaunitz S, Novotny MV. Comprehensive Analytical Approach toward Glycomic Characterization and Profiling in Urinary Exosomes. Anal Chem 2017; 89:5364-5372. [PMID: 28402650 DOI: 10.1021/acs.analchem.7b00062] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Exosomes are extracellular nanosized vesicles with lipid bilayers encapsulating nucleic acids and proteins, both with and without glycosylation. While exosomal nucleic acids and proteins have previously been explored to identify cancer biomarkers with some promising results, little information has been available concerning their glycoconjugate content. Exosomes were isolated from normal urine samples through multistep differential centrifugation. The isolated exosomes have an average size of 146 nm and a spherical shape, as determined by dynamic light scattering and transmission electron microscopy, respectively. N-Glycans were enzymatically released from the isolated vesicles. After being reduced and permethylated, N-glycans were measured by MALDI mass spectrometry. Paucimannosidic, high-mannose, and complex type glycans were identified and their relative abundances were determined. Some detailed structures of these glycans were revealed through liquid chromatography/tandem mass spectrometry (LC/MS-MS). The reduced N-glycans, without being permethylated, were also separated and analyzed by LC/MS-MS, and their structures were further detailed through isomeric separation on porous graphitized carbon (PGC) packed in long capillaries. Using microfractionation before LC/MS-MS, minor multiantennary N-glycans were preconcentrated as based on hydrophobicity or charge. Preconcentration of the reduced and permethylated glycans on a C18 cartridge revealed numerous large glycans, whereas fractionation of the reduced N-glycans by ion-exchange cartridges facilitated detection of sulfated glycans. After removing N-glycans from the original sample aliquot, O-glycans were chemically released from urinary exosomes and profiled, revealing some unusual structures.
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Affiliation(s)
- Guozhang Zou
- Department of Chemistry, Indiana University , Bloomington, Indiana 47405, United States
| | - John D Benktander
- Department of Chemistry, Indiana University , Bloomington, Indiana 47405, United States
| | - Solomon T Gizaw
- Department of Chemistry, Indiana University , Bloomington, Indiana 47405, United States
| | - Stefan Gaunitz
- Department of Chemistry, Indiana University , Bloomington, Indiana 47405, United States
| | - Milos V Novotny
- Department of Chemistry, Indiana University , Bloomington, Indiana 47405, United States
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23
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Zhao J, Li S, Li C, Wu SL, Xu W, Chen Y, Shameem M, Richardson D, Li H. Identification of Low Abundant Isomeric N-Glycan Structures in Biological Therapeutics by LC/MS. Anal Chem 2016; 88:7049-59. [PMID: 27291648 DOI: 10.1021/acs.analchem.6b00636] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An effective LC-MS based method for online characterization of low abundant structural isomers of N-linked glycans in biological therapeutics was developed. N-linked glycans of a recombinant monoclonal antibody were released by PNGase F and labeled with 2-aminobenzamide (2-AB) fluorescent tag. The labeled glycans were analyzed by online ultraperformance liquid chromatography-hydrophilic interaction liquid chromatography (UPLC-HILIC) coupled with mass spectrometry (MS). The glycan structure was characterized by MS(n) fragmentation in negative ion mode followed by identification of the signature D ions. The assignment included monosaccharide sequence and linkage information. The developed method successfully characterized structural isomers of A1G1F (assigned as terminal sialic acid attached in the 1,6 branch at 2,3 position), and A1G1F' (assigned as terminal sialic acid attached in the 1,3 branch at 2,3 position). Moreover, using the same approach, previously unknown low abundant species were identified unambiguously. One such structural isomer at low level, terminal GlcNAc of G1F+GlcNAc, was identified to be linked at the 1,6 branch. Additionally, another low level structural isomer, previously assigned as Man8 glycan, was found to be Man7+Glc glycan as its 1,3 branch containing three mannoses and one terminal glucose. The identification was further confirmed by a purified α-1,2-endomannosidase enzyme to generate the cleavage of α-1,3 linked terminal disaccharides (Man+glucose). Using this approach, different lots or different CHO produced mAbs was thoroughly examined and found that the newly identified "Man8" (Man7+Glc) was also present in different batches and in some commercially available therapeutic mAbs.
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Affiliation(s)
| | - Siyang Li
- BioAnalytix, Inc., Cambridge, Massachusetts 02139, United States
| | - Chen Li
- BioAnalytix, Inc., Cambridge, Massachusetts 02139, United States
| | - Shiaw-Lin Wu
- BioAnalytix, Inc., Cambridge, Massachusetts 02139, United States
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24
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Rožman M. Characterization and Modeling of the Collision Induced Dissociation Patterns of Deprotonated Glycosphingolipids: Cleavage of the Glycosidic Bond. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:91-98. [PMID: 26297186 DOI: 10.1007/s13361-015-1247-2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 07/13/2015] [Accepted: 07/23/2015] [Indexed: 06/04/2023]
Abstract
Glycosphingolipid fragmentation behavior was investigated by combining results from analysis of a series of negative ion tandem mass spectra and molecular modeling. Fragmentation patterns extracted from 75 tandem mass spectra of mainly acidic glycosphingolipid species (gangliosides) suggest prominent cleavage of the glycosidic bonds with retention of the glycosidic oxygen atom by the species formed from the reducing end (B and Y ion formation). Dominant product ions arise from dissociation of sialic acids glycosidic bonds whereas product ions resulting from cleavage of other glycosidic bonds are less abundant. Potential energy surfaces and unimolecular reaction rates of several low-energy fragmentation pathways leading to cleavage of glycosidic bonds were estimated in order to explain observed dissociation patterns. Glycosidic bond cleavage in both neutral (unsubstituted glycosyl group) and acidic glycosphingolipids was the outcome of the charge-directed intramolecular nucleophilic substitution (SN2) mechanism. According to the suggested mechanism, the nucleophile in a form of carboxylate or oxyanion attacks the carbon at position one of the sugar ring, simultaneously breaking the glycosidic bond and yielding an epoxide. For gangliosides, unimolecular reaction rates suggest that dominant product ions related to the cleavage of sialic acid glycosidic bonds are formed via direct dissociation channels. On the other hand, low abundant product ions related to the dissociation of other glycosidic bonds are more likely to be the result of sequential dissociation. Although results from this study mainly contribute to the understanding of glycosphingolipid fragmentation chemistry, some mechanistic findings regarding cleavage of the glycosidic bond may be applicable to other glycoconjugates.
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Affiliation(s)
- Marko Rožman
- Division of Physical Chemistry, Ruđer Bošković Institute, Bijenička 54, HR-10002, Zagreb, Croatia.
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25
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Saumonneau A, Champion E, Peltier-Pain P, Molnar-Gabor D, Hendrickx J, Tran V, Hederos M, Dekany G, Tellier C. Design of an α-l-transfucosidase for the synthesis of fucosylated HMOs. Glycobiology 2015; 26:261-9. [DOI: 10.1093/glycob/cwv099] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Accepted: 10/29/2015] [Indexed: 11/13/2022] Open
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26
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Gao C, Zhang Y, Liu Y, Feizi T, Chai W. Negative-Ion Electrospray Tandem Mass Spectrometry and Microarray Analyses of Developmentally Regulated Antigens Based on Type 1 and Type 2 Backbone Sequences. Anal Chem 2015; 87:11871-8. [PMID: 26530895 DOI: 10.1021/acs.analchem.5b03471] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Type 1 (Galβ1-3GlcNAc) and type 2 (Galβ1-4GlcNAc) sequences are constituents of the backbones of a large family of glycans of glycoproteins and glycolipids whose branching and peripheral substitutions are developmentally regulated. It is highly desirable to have microsequencing methods that can be used to precisely identify and monitor these oligosaccharide sequences with high sensitivity. Negative-ion electrospray tandem mass spectrometry with collision-induced dissociation has been used for characterization of branching points, peripheral substitutions, and partial assignment of linkages in reducing oligosaccharides. We now extend this method to characterizing entire sequences of linear type 1 and type 2 chain-based glycans, focusing on the type 1 and type 2 units in the internal regions including the linkages connecting type 1 and type 2 disaccharide units. We apply the principles to sequence analysis of closely related isomeric oligosaccharides and demonstrate by microarray analyses distinct binding activities of antibodies and a lectin toward various combinations of type 1 and 2 units joined by 1,3- and 1,6-linkages. These sequence-specific carbohydrate-binding proteins are in turn valuable tools for detecting and distinguishing the type 1 and type 2-based developmentally regulated glycan sequences.
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Affiliation(s)
- Chao Gao
- Glycosciences Laboratory, Department of Medicine, Imperial College London , Hammersmith Campus, London W12 0NN, U.K
| | - Yibing Zhang
- Glycosciences Laboratory, Department of Medicine, Imperial College London , Hammersmith Campus, London W12 0NN, U.K
| | - Yan Liu
- Glycosciences Laboratory, Department of Medicine, Imperial College London , Hammersmith Campus, London W12 0NN, U.K
| | - Ten Feizi
- Glycosciences Laboratory, Department of Medicine, Imperial College London , Hammersmith Campus, London W12 0NN, U.K
| | - Wengang Chai
- Glycosciences Laboratory, Department of Medicine, Imperial College London , Hammersmith Campus, London W12 0NN, U.K
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27
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Wu J, Lv Y, Liu X, Zhao X, Jiao G, Tai W, Wang P, Zhao X, Cai C, Yu G. Structural Study of Sulfated Fuco-Oligosaccharide Branched Glucuronomannan fromKjellmaniella crassifoliaby ESI-CID-MS/MS. J Carbohydr Chem 2015. [DOI: 10.1080/07328303.2015.1050593] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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28
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Dong L, Shi B, Tian G, Li Y, Wang B, Zhou M. An Accurate de novo Algorithm for Glycan Topology Determination from Mass Spectra. IEEE/ACM TRANSACTIONS ON COMPUTATIONAL BIOLOGY AND BIOINFORMATICS 2015; 12:568-578. [PMID: 26357268 DOI: 10.1109/tcbb.2014.2368981] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Determining the glycan topology automatically from mass spectra represents a great challenge. Existing methods fall into approximate and exact ones. The former including greedy and heuristic ones can reduce the computational complexity, but suffer from information lost in the procedure of glycan interpretation. The latter including dynamic programming and exhaustive enumeration are much slower than the former. In the past years, nearly all emerging methods adopted a tree structure to represent a glycan. They share such problems as repetitive peak counting in reconstructing a candidate structure. Besides, tree-based glycan representation methods often have to give different computational formulas for binary and ternary glycans. We propose a new directed acyclic graph structure for glycan representation. Based on it, this work develops a de novo algorithm to accurately reconstruct the tree structure iteratively from mass spectra with logical constraints and some known biosynthesis rules, by a single computational formula. The experiments on multiple complex glycans extracted from human serum show that the proposed algorithm can achieve higher accuracy to determine a glycan topology than prior methods without increasing computational burden.
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29
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Palma AS, Liu Y, Zhang H, Zhang Y, McCleary BV, Yu G, Huang Q, Guidolin LS, Ciocchini AE, Torosantucci A, Wang D, Carvalho AL, Fontes CMGA, Mulloy B, Childs RA, Feizi T, Chai W. Unravelling glucan recognition systems by glycome microarrays using the designer approach and mass spectrometry. Mol Cell Proteomics 2015; 14:974-88. [PMID: 25670804 PMCID: PMC4390274 DOI: 10.1074/mcp.m115.048272] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Indexed: 11/06/2022] Open
Abstract
Glucans are polymers of d-glucose with differing linkages in linear or branched sequences. They are constituents of microbial and plant cell-walls and involved in important bio-recognition processes, including immunomodulation, anticancer activities, pathogen virulence, and plant cell-wall biodegradation. Translational possibilities for these activities in medicine and biotechnology are considerable. High-throughput micro-methods are needed to screen proteins for recognition of specific glucan sequences as a lead to structure–function studies and their exploitation. We describe construction of a “glucome” microarray, the first sequence-defined glycome-scale microarray, using a “designer” approach from targeted ligand-bearing glucans in conjunction with a novel high-sensitivity mass spectrometric sequencing method, as a screening tool to assign glucan recognition motifs. The glucome microarray comprises 153 oligosaccharide probes with high purity, representing major sequences in glucans. Negative-ion electrospray tandem mass spectrometry with collision-induced dissociation was used for complete linkage analysis of gluco-oligosaccharides in linear “homo” and “hetero” and branched sequences. The system is validated using antibodies and carbohydrate-binding modules known to target α- or β-glucans in different biological contexts, extending knowledge on their specificities, and applied to reveal new information on glucan recognition by two signaling molecules of the immune system against pathogens: Dectin-1 and DC-SIGN. The sequencing of the glucan oligosaccharides by the MS method and their interrogation on the microarrays provides detailed information on linkage, sequence and chain length requirements of glucan-recognizing proteins, and are a sensitive means of revealing unsuspected sequences in the polysaccharides.
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Affiliation(s)
- Angelina S Palma
- From the ‡Glycosciences Laboratory, Department of Medicine, Imperial College London, United Kingdom; §UCIBIO-REQUIMTE, Department of Chemistry, Faculty of Science and Technology, NOVA University of Lisbon;
| | - Yan Liu
- From the ‡Glycosciences Laboratory, Department of Medicine, Imperial College London, United Kingdom
| | - Hongtao Zhang
- From the ‡Glycosciences Laboratory, Department of Medicine, Imperial College London, United Kingdom
| | - Yibing Zhang
- From the ‡Glycosciences Laboratory, Department of Medicine, Imperial College London, United Kingdom
| | | | - Guangli Yu
- ‖Key Laboratory of Marine Drugs, Shandong Provincial Key Laboratory of Glycoscience and Glycotechnology, School of Medicine and Pharmacy, Ocean University of China
| | - Qilin Huang
- **Department of Chemistry, Wuhan University, Wuhan, China
| | - Leticia S Guidolin
- ‡‡Instituto de Investigaciones Biotecnológicas "Dr. Rodolfo A. Ugalde", Instituto Tecnológico de Chascomús (IIB-INTECH), Universidad Nacional de San Martín, Buenos Aires, Argentina
| | - Andres E Ciocchini
- ‡‡Instituto de Investigaciones Biotecnológicas "Dr. Rodolfo A. Ugalde", Instituto Tecnológico de Chascomús (IIB-INTECH), Universidad Nacional de San Martín, Buenos Aires, Argentina
| | - Antonella Torosantucci
- §§Department of Infectious, Parasitic and Immune-mediated Diseases, Istituto Superiore di Sanitá, Rome, Italy
| | - Denong Wang
- ¶¶Tumor Glycomics Laboratory, SRI International Biosciences Division, Menlo Park, CA
| | - Ana Luísa Carvalho
- §UCIBIO-REQUIMTE, Department of Chemistry, Faculty of Science and Technology, NOVA University of Lisbon
| | - Carlos M G A Fontes
- ‖‖CIISA, Faculdade de Medicina Veterinária, Universidade de Lisboa, Portugal
| | - Barbara Mulloy
- From the ‡Glycosciences Laboratory, Department of Medicine, Imperial College London, United Kingdom
| | - Robert A Childs
- From the ‡Glycosciences Laboratory, Department of Medicine, Imperial College London, United Kingdom
| | - Ten Feizi
- From the ‡Glycosciences Laboratory, Department of Medicine, Imperial College London, United Kingdom
| | - Wengang Chai
- From the ‡Glycosciences Laboratory, Department of Medicine, Imperial College London, United Kingdom;
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30
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Konda C, Londry FA, Bendiak B, Xia Y. Assignment of the stereochemistry and anomeric configuration of sugars within oligosaccharides via overlapping disaccharide ladders using MS(n). JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2014; 25:1441-1450. [PMID: 24722900 DOI: 10.1007/s13361-014-0881-4] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2014] [Revised: 03/10/2014] [Accepted: 03/10/2014] [Indexed: 06/03/2023]
Abstract
A systematic approach is described that can pinpoint the stereo-structures (sugar identity, anomeric configuration, and location) of individual sugar units within linear oligosaccharides. Using a highly modified mass spectrometer, dissociation of linear oligosaccharides in the gas phase was optimized along multiple-stage tandem dissociation pathways (MS(n), n = 4 or 5). The instrument was a hybrid triple quadrupole/linear ion trap mass spectrometer capable of high-efficiency bidirectional ion transfer between quadrupole arrays. Different types of collision-induced dissociation (CID), either on-resonance ion trap or beam-type CID could be utilized at any given stage of dissociation, enabling either glycosidic bond cleavages or cross-ring cleavages to be maximized when wanted. The approach first involves optimizing the isolation of disaccharide units as an ordered set of overlapping substructures via glycosidic bond cleavages during early stages of MS(n), with explicit intent to minimize cross-ring cleavages. Subsequently, cross-ring cleavages were optimized for individual disaccharides to yield key diagnostic product ions (m/z 221). Finally, fingerprint patterns that establish stereochemistry and anomeric configuration were obtained from the diagnostic ions via CID. Model linear oligosaccharides were derivatized at the reducing end, allowing overlapping ladders of disaccharides to be isolated from MS(n). High confidence stereo-structural determination was achieved by matching MS(n) CID of the diagnostic ions to synthetic standards via a spectral matching algorithm. Using this MS(n) (n = 4 or 5) approach, the stereo-structures, anomeric configurations, and locations of three individual sugar units within two pentasaccharides were successfully determined.
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Affiliation(s)
- Chiharu Konda
- Department of Chemistry, Purdue University, West Lafayette, IN, 47907, USA
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31
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Kailemia MJ, Ruhaak LR, Lebrilla CB, Amster IJ. Oligosaccharide analysis by mass spectrometry: a review of recent developments. Anal Chem 2014; 86:196-212. [PMID: 24313268 PMCID: PMC3924431 DOI: 10.1021/ac403969n] [Citation(s) in RCA: 266] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
| | - L. Renee Ruhaak
- Department of Chemistry, University of California at Davis, Davis, CA 95616
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32
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Abstract
Powerful new strategies based on mass spectrometry are revolutionizing the structural analysis and profiling of glycans and glycoconjugates. We survey here the major biosynthetic pathways that underlie the biological diversity in glycobiology, with emphasis on glycoproteins, and the approaches that can be used to address the resulting heterogeneity. Included among these are derivatizations, on- and off-line chromatography, electrospray and matrix-assisted laser desorption/ionization, and a variety of dissociation methods, the recently introduced electron-based techniques being of particular interest.
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Affiliation(s)
- Liang Han
- Center for Biomedical Mass Spectrometry, Boston University School of Medicine, Boston, MA 02118, USA.
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33
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Fouquet T, Toniazzo V, Ruch D, Charles L. Use of doubly charged precursors to validate dissociation mechanisms of singly charged poly(dimethylsiloxane) oligomers. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2013; 24:1123-1129. [PMID: 23715871 DOI: 10.1007/s13361-013-0665-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 02/25/2013] [Accepted: 05/05/2013] [Indexed: 06/02/2023]
Abstract
Collision-induced dissociation of doubly charged poly(dimethylsiloxane) (PDMS) molecules was investigated to provide experimental evidence for fragmentation reactions proposed to occur upon activation of singly charged oligomers. This study focuses on two PDMS species holding trimethylsilyl or methoxy end-groups and cationized with ammonium. In both cases, introduction of the additional charge did not induce significant differences in dissociation behavior, and the use of doubly charged precursors enabled the occurrence of charge-separation reactions, allowing molecules always eliminated as neutrals upon activation of singly charged oligomers to be detected as cationized species. In the case of trimethylsilyl-terminated oligomers, random location of the adducted charge combined with rapid consecutive reactions proposed to occur from singly charged precursors could be validated based on MS/MS data of doubly charged oligomers. In the case of methoxy-terminated PDMS, favored interaction of the adducted ammonium with both end-groups, proposed to rationalize the dissociation behavior of singly charged molecules, was also supported by MS/MS data obtained for molecules adducted with two ammonium cations.
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Affiliation(s)
- Thierry Fouquet
- Aix-Marseille Université-CNRS, Institut de Chimie Radicalaire ICR, UMR 7273, 13397, Marseille, France
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34
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Zhang H, Zhang S, Tao G, Zhang Y, Mulloy B, Zhan X, Chai W. Typing of blood-group antigens on neutral oligosaccharides by negative-ion electrospray ionization tandem mass spectrometry. Anal Chem 2013; 85:5940-9. [PMID: 23692402 PMCID: PMC3856363 DOI: 10.1021/ac400700e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Blood-group antigens, such as those containing fucose and bearing the ABO(H)- and Lewis-type determinants expressed on the carbohydrate chains of glycoproteins and glycolipids, and also on unconjugated free oligosaccharides in human milk and other secretions, are associated with various biological functions. We have previously shown the utility of negative-ion electrospay ionization tandem mass spectrometry with collision-induced dissociation (ESI-CID-MS/MS) for typing of Lewis (Le) determinants, for example, Le(a), Le(x), Le(b), and Le(y) on neutral and sialylated oligosaccharide chains. In the present report, we extended the strategy to characterization of blood-group A-, B-, and H-determinants on type 1 and type 2 and also on type 4 globoside chains to provide a high sensitivity method for typing of all the major blood-group antigens, including the A, B, H, Le(a), Le(x), Le(b), and Le(y) determinants, present in oligosaccharides. Using the principles established, we identified two minor unknown oligosaccharide components present in the products of enzymatic synthesis by bacterial fermentation. We also demonstrated that the unique fragmentations derived from the D- and (0,2)A-type cleavages observed in ESI-CID-MS/MS, which are important for assigning blood-group and chain types, only occur under the negative-ion conditions for reducing sugars but not for reduced alditols or under positive-ion conditions.
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Affiliation(s)
- Hongtao Zhang
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, China
| | - Shuang Zhang
- Testing and Analysis Centre, State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, China
| | - Guanjun Tao
- Testing and Analysis Centre, State Key Laboratory of Food Science and Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, China
| | - Yibing Zhang
- Glycosciences Laboratory, Department of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, United Kingdom
| | - Barbara Mulloy
- Glycosciences Laboratory, Department of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, United Kingdom
| | - Xiaobei Zhan
- The Key Laboratory of Carbohydrate Chemistry and Biotechnology of Ministry of Education, School of Biotechnology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, China
| | - Wengang Chai
- Glycosciences Laboratory, Department of Medicine, Imperial College London, Hammersmith Campus, Du Cane Road, London W12 0NN, United Kingdom
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Barone A, Benktander J, Ångström J, Aspegren A, Björquist P, Teneberg S, Breimer ME. Structural complexity of non-acid glycosphingolipids in human embryonic stem cells grown under feeder-free conditions. J Biol Chem 2013; 288:10035-10050. [PMID: 23404501 DOI: 10.1074/jbc.m112.436162] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Due to their pluripotency and growth capability, there are great expectations for human embryonic stem cells, both as a resource for functional studies of early human development and as a renewable source of cells for use in regenerative medicine and transplantation. However, to bring human embryonic stem cells into clinical applications, their cell surface antigen expression and its chemical structural complexity have to be defined. In the present study, total non-acid glycosphingolipid fractions were isolated from two human embryonic stem cell lines (SA121 and SA181) originating from leftover in vitro fertilized human embryos, using large amounts of starting material (1 × 10(9) cells/cell line). The total non-acid glycosphingolipid fractions were characterized by antibody and lectin binding, mass spectrometry, and proton NMR. In addition to the globo-series and type 1 core chain glycosphingolipids previously described in human embryonic stem cells, a number of type 2 core chain glycosphingolipids (neo-lactotetraosylceramide, the H type 2 pentaosylceramide, the Le(x) pentaosylceramide, and the Le(y) hexaosylceramide) were identified as well as the blood group A type 1 hexaosylceramide. Finally, the mono-, di-, and triglycosylceramides were characterized as galactosylceramide, glucosylceramide, lactosylceramide, galabiaosylceramide, globotriaosylceramide, and lactotriaosylceramide. Thus, the glycan diversity of human embryonic stem cells, including cell surface immune determinants, is more complex than previously appreciated.
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Affiliation(s)
- Angela Barone
- Department of Surgery, Sahlgrenska University Hospital, S-41 345 Göteborg, Sweden
| | - John Benktander
- Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology, P.O. Box 440, University of Gothenburg, S-405 30 Göteborg, Sweden
| | - Jonas Ångström
- Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology, P.O. Box 440, University of Gothenburg, S-405 30 Göteborg, Sweden
| | - Anders Aspegren
- Cellectis Stem Cells, Cellartis AB, Arvid Wallgrens Backe 20, S-413 46 Göteborg, Sweden
| | - Petter Björquist
- Cellectis Stem Cells, Cellartis AB, Arvid Wallgrens Backe 20, S-413 46 Göteborg, Sweden
| | - Susann Teneberg
- Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology, P.O. Box 440, University of Gothenburg, S-405 30 Göteborg, Sweden.
| | - Michael E Breimer
- Department of Surgery, Sahlgrenska University Hospital, S-41 345 Göteborg, Sweden
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Chen ST, Her GR. Linkage and branch analysis of high-mannose oligosaccharides using closed-ring labeling of 8-aminopyrene-1,3,6-trisulfonate and p-aminobenzoic ethyl ester and negative ion trap mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2012; 23:1408-1418. [PMID: 22673837 DOI: 10.1007/s13361-012-0420-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2012] [Revised: 05/09/2012] [Accepted: 05/15/2012] [Indexed: 06/01/2023]
Abstract
A strategy based on negative ion electrospray ionization tandem mass spectrometry and closed-ring labeling with both 8-aminopyrene-1,3,6-trisulfonate (APTS) and p-aminobenzoic acid ethyl ester (ABEE) was developed for linkage and branch determination of high-mannose oligosaccharides. X-type cross-ring fragment ions obtained from APTS-labeled oligosaccharides by charge remote fragmentation provided information on linkages near the non-reducing terminus. In contrast, A-type cross-ring fragment ions observed from ABEE-labeled oligosaccharides yielded information on linkages near the reducing terminus. This complementary information provided by APTS- and ABEE-labeled oligosaccharides was utilized to delineate the structures of the high-mannose oligosaccharides. As a demonstration of this approach, the linkages and branches of high-mannose oligosaccharides Man(5)GlcNAc(2), Man(6)GlcNAc(2), Man(8)GlcNAc(2), and Man(9)GlcNAc(2) cleaved from the ribonuclease B were assigned from MS(2) spectra of ABEE- and APTS-labeled derivatives.
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Affiliation(s)
- Shu-Ting Chen
- Department of Chemistry, National Taiwan University, Taipei, Taiwan
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37
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Benktander J, Ångström J, Breimer ME, Teneberg S. Redefinition of the carbohydrate binding specificity of Helicobacter pylori BabA adhesin. J Biol Chem 2012; 287:31712-24. [PMID: 22822069 PMCID: PMC3442506 DOI: 10.1074/jbc.m112.387654] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
Certain Helicobacter pylori strains adhere to the human gastric epithelium using the blood group antigen-binding adhesin (BabA). All BabA-expressing H. pylori strains bind to the blood group O determinants on type 1 core chains, i.e. to the Lewis b antigen (Fucα2Galβ3(Fucα4)GlcNAc; Leb) and the H type 1 determinant (Fucα2Galβ3GlcNAc). Recently, BabA strains have been categorized into those recognizing only Leb and H type 1 determinants (designated specialist strains) and those that also bind to A and B type 1 determinants (designated generalist strains). Here, the structural requirements for carbohydrate recognition by generalist and specialist BabA were further explored by binding of these types of strains to a panel of different glycosphingolipids. Three glycosphingolipids recognized by both specialist and generalist BabA were isolated from the small intestine of a blood group O pig and characterized by mass spectrometry and proton NMR as H type 1 pentaglycosylceramide (Fucα2Galβ3GlcNAcβ3Galβ4Glcβ1Cer), Globo H hexaglycosylceramide (Fucα2Galβ3GalNAcβ3Galα4Galβ4Glcβ1Cer), and a mixture of three complex glycosphingolipids (Fucα2Galβ4GlcNAcβ6(Fucα2Galβ3GlcNAcβ3)Galβ3GlcNAcβ3Galβ4Glcβ1Cer, Fucα2Galβ3GlcNAcβ6(Fucα2Galβ3GlcNAcβ3)Galβ3GlcNAcβ3Galβ4Glcβ1Cer, and Fucα2Galβ4(Fucα3)GlcNAcβ6(Fucα2Galβ3GlcNAcβ3)Galβ3GlcNAcβ3Galβ4Glcβ1Cer). In addition to the binding of both strains to the Globo H hexaglycosylceramide, i.e. a blood group O determinant on a type 4 core chain, the generalist strain bound to the Globo A heptaglycosylceramide (GalNAcα3(Fucα2)Galβ3GalNAcβ3Galα4Galβ4Glcβ1Cer), i.e. a blood group A determinant on a type 4 core chain. The binding of BabA to the two sets of isoreceptors is due to conformational similarities of the terminal disaccharides of H type 1 and Globo H and of the terminal trisaccharides of A type 1 and Globo A.
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Affiliation(s)
- John Benktander
- Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology, P. O. Box 440, University of Gothenburg, S-405 30 Göteborg, Sweden
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Li H, Mao W, Chen Y, Ren S, Qi X, Chen Y, Zhao C, Li N, Wang C, Lin C, Yan M, Shan J. Sequence analysis of the sulfated rhamno-oligosaccharides derived from a sulfated rhamnan. Carbohydr Polym 2012; 90:1299-304. [PMID: 22939344 DOI: 10.1016/j.carbpol.2012.06.076] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Revised: 06/08/2012] [Accepted: 06/27/2012] [Indexed: 11/28/2022]
Abstract
Three sulfated rhamno-oligosaccharides, designated O1, O2 and O3, were obtained by mild acid hydrolysis of the sulfated rhamnan and purified by gel-permeation chromatography. On the basis of one- and two-dimensional nuclear magnetic resonance (1D, 2D NMR) spectroscopic analyses, the oligosaccharide O1 was characterized to be α-L-Rhap-(2SO4)-(1→3)-α-L-Rhap. The fragmentation pattern of the homogeneous disaccharide in the product ion spectra was recognized by negative-ion electrospray tandem mass spectrometry with collision-induced dissociation (ES-CID MS/MS). With the principles established, the sequences of the oligosaccharides O2 and O3 were deduced to be α-L-Rhap-(2SO4)-(1→3)-α-L-Rhap-(1→3)-α-L-Rhap, and α-L-Rhap-(2SO4)-(1→3)-α-L-Rhap-(1→3)-α-L-Rhap-(1→3)-α-L-Rhap (2SO(4)), respectively. The investigation demonstrated that the sulfated rhamnan-derived oligosaccharides were novel sulfated oligosaccharides different from those of other polysaccharides-degraded from algae, and it could be possible to determine the sequence of the sulfated rhamno-oligosaccharides directly from the glycosidic cleavage fragmentation in the product ion spectra.
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Affiliation(s)
- Hongyan Li
- Key Laboratory of Marine Drugs, Ministry of Education, Institute of Marine Drug and Food, Ocean University of China, Qingdao 266003, People's Republic of China
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Sequence determination and anticoagulant and antithrombotic activities of a novel sulfated fucan isolated from the sea cucumber Isostichopus badionotus. Biochim Biophys Acta Gen Subj 2012; 1820:989-1000. [PMID: 22446377 DOI: 10.1016/j.bbagen.2012.03.002] [Citation(s) in RCA: 112] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2011] [Revised: 03/06/2012] [Accepted: 03/07/2012] [Indexed: 11/20/2022]
Abstract
BACKGROUND The aim is to analyze the structure, anticoagulant and antithrombotic activities of a sulfated fucan isolated from sea cucumber Isostichopus badionotus (fucan-Ib). METHODS Fucan-Ib was hydrolyzed under mild acid conditions. The oligosaccharide fragments were fractionated by gel-filtration chromatography and the structures were determined by negative-ion electrospray tandem mass spectrometry with collision-induced dissociation and two-dimensional NMR. Anticoagulant activities were measured by activated partial thromboplastin, thrombin and prothrombin times, and by in vitro inhibition experiments with factors IIa and Xa. Antithrombotic activities were determined in vitro by measuring the length and weight of the thrombus generated. RESULT The linear polysaccharide sequence of fucan-Ib was deduced from the structures of its oligosaccharide fragments produced by acid hydrolysis. Under mild conditions, the glycosidic bonds between the non-sulfated and 2,4-O-disulfated fucose residues were selectively cleaved and highly ordered oligosaccharide fragments with a tetrasaccharide repeating unit [→3Fuc(2S,4S)α1→3Fuc(2S)α1→3Fuc(2S)α1→3Fucα1→]n were obtained. In in vitro assays fucan-Ib showed good anticoagulant and antithrombotic activities compared with heparin and the fucosylated chondroitin sulfate isolated from the same source (fCS-Ib). The two polysaccharides, fucan-Ib and fCS-Ib, differ in the mechanism of action; the former exhibited activity mainly by potentiation of antithrombin acted on thrombin and factor Xa whereas the latter mainly through heparin cofactor II. CONCLUSION Fucan-Ib has a well defined structure with tetrasaccharide tandem repeats and good anticoagulant and antithrombotic activities. GENERAL IMPORTANCE: Fucan-Ib has a well defined structure and can be readily quality-controlled, and therefore has potential therapeutic value as an affective antithrombotic drug with low risk of bleeding.
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Domann P, Spencer DIR, Harvey DJ. Production and fragmentation of negative ions from neutral N-linked carbohydrates ionized by matrix-assisted laser desorption/ionization. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2012; 26:469-479. [PMID: 22279023 DOI: 10.1002/rcm.5322] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Although negative ion fragmentation mass spectra of neutral N-linked carbohydrates (those attached to Asn in glycoproteins) provide much more structural information than spectra recorded in positive ion mode, neutral carbohydrates are reluctant to form negative ions by matrix-assisted laser desorption/ionization (MALDI) unless ionized from specific matrices such as nor-harmane or adducted with anions such as chloride. This paper reports the results of experiments to optimize negative ion formation from adducts of N-linked glycans with respect to ion abundance and fragment ion production. The best results were obtained with 2,4,6-trihydroxyacetophenone (THAP) as the matrix with added ammonium nitrate as the salt providing the anion. This approach is demonstrated to be applicable for a wide range of N-linked glycan structures. Phosphate adducts, analogous to those that are usually encountered in electrospray spectra from N-glycans released by protein N-glycosidase F, were produced by addition of ammonium phosphate to the matrix but in relatively low yield allowing competitive ionization of endogenous anionic compounds leading to complex spectra. Fragmentation of the nitrate adducts, which were formed in higher yield, generally paralleled that seen by collision-induced dissociation following ionization by electrospray, with the first stage of the dissociation being the elimination of the nitrate with a proton from one of the hydroxyl groups of the sugar. The spectra of the resulting [M-H](-) species displayed very specific fragment ions, mainly cross-ring and C-type glycosidic cleavage products, that revealed more structural (linkage and branching) information of the compounds than the mainly glycosidic cleavage products that dominated the positive ion spectra.
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Affiliation(s)
- Paula Domann
- LGC Ltd., Queens Road, Teddington, Middlesex, TW11 0LY, UK
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41
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Mikshina PV, Gurjanov OP, Mukhitova FK, Petrova AA, Shashkov AS, Gorshkova TA. Structural details of pectic galactan from the secondary cell walls of flax (Linum usitatissimum L.) phloem fibres. Carbohydr Polym 2012; 87:853-861. [DOI: 10.1016/j.carbpol.2011.08.068] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2011] [Revised: 08/19/2011] [Accepted: 08/24/2011] [Indexed: 10/17/2022]
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Walker SH, Lilley LM, Enamorado MF, Comins DL, Muddiman DC. Hydrophobic derivatization of N-linked glycans for increased ion abundance in electrospray ionization mass spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2011; 22:1309-17. [PMID: 21953184 PMCID: PMC3700344 DOI: 10.1007/s13361-011-0140-x] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2010] [Revised: 02/08/2011] [Accepted: 03/15/2011] [Indexed: 05/12/2023]
Abstract
A library of neutral, hydrophobic reagents was synthesized for use as derivatizing agents in order to increase the ion abundance of N-linked glycans in electrospray ionization mass spectrometry (ESI MS). The glycans are derivatized via hydrazone formation and are shown to increase the ion abundance of a glycan standard more than 4-fold. Additionally, the data show that the systematic addition of hydrophobic surface area to the reagent increases the glycan ion abundance, a property that can be further exploited in the analysis of glycans. The results of this study will direct the future synthesis of hydrophobic reagents for glycan analysis using the correlation between hydrophobicity and theoretical non-polar surface area calculation to facilitate the development of an optimum tag for glycan derivatization. The compatibility and advantages of this method are demonstrated by cleaving and derivatizing N-linked glycans from human plasma proteins. The ESI-MS signal for the tagged glycans are shown to be significantly more abundant, and the detection of negatively charged sialylated glycans is enhanced.
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Affiliation(s)
- S. Hunter Walker
- W. M. Keck FT-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, USA
| | - Laura M. Lilley
- Department of Chemistry, Warren Wilson College, Asheville, North Carolina 28815, USA
| | - Monica F. Enamorado
- W. M. Keck FT-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, USA
| | - Daniel L. Comins
- W. M. Keck FT-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, USA
| | - David C. Muddiman
- W. M. Keck FT-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695, USA
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Doohan RA, Hayes CA, Harhen B, Karlsson NG. Negative ion CID fragmentation of O-linked oligosaccharide aldoses--charge induced and charge remote fragmentation. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2011; 22:1052-1062. [PMID: 21953046 DOI: 10.1007/s13361-011-0102-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2010] [Revised: 02/05/2011] [Accepted: 02/08/2011] [Indexed: 05/31/2023]
Abstract
Collision induced dissociation (CID) fragmentation was compared between reducing and reduced sulfated, sialylated, and neutral O-linked oligosaccharides. It was found that fragmentation of the [M - H](-) ions of aldoses with acidic residues gave unique Z-fragmentation of the reducing end GalNAc containing the acidic C-6 branch, where the entire C-3 branch was lost. This fragmentation pathway, which is not seen in the alditols, showed that the process involved charge remote fragmentation catalyzed by a reducing end acidic anomeric proton. With structures containing sialic acid on both the C-3 and C-6 branch, the [M - H](-) ions were dominated by the loss of sialic acid. This fragmentation pathway was also pronounced in the [M - 2H](2-) ions revealing both the C-6 Z-fragment plus its complementary C-3 C-fragment in addition to glycosidic and cross ring fragmentation. This generation of the Z/C-fragment pairs from GalNAc showed that the charges were not participating in their generation. Fragmentation of neutral aldoses showed pronounced Z-fragmentation believed to be generated by proton migration from the C-6 branch to the negatively charged GalNAc residue followed by charge remote fragmentation similar to the acidic oligosaccharides. In addition, A-type fragments generated by charge induced fragmentation of neutral oligosaccharides were observed when the charge migrated from C-1 of the GalNAc to the GlcNAc residue followed by rearrangement to accommodate the (0,2)A-fragmentation. LC-MS also showed that O-linked aldoses existed as interchangeable α/β pyranose anomers, in addition to a third isomer (25% of the total free aldose) believed to be the furanose form.
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Affiliation(s)
- Roisin A Doohan
- School of Chemistry, National University of Ireland, Galway, Ireland
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Yang H, Yu Y, Song F, Liu S. Structural characterization of neutral oligosaccharides by laser-enhanced in-source decay of MALDI-FTICR MS. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2011; 22:845-855. [PMID: 21472519 DOI: 10.1007/s13361-011-0085-0] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2010] [Revised: 01/09/2011] [Accepted: 01/13/2011] [Indexed: 05/30/2023]
Abstract
MALDI in-source decay (ISD) technique described to date has proven to be a convenient and rapid method for sequencing purified peptides and proteins. However, the general ISD still can not produce adequate fragments for the detailed structural elucidation of oligosaccharides. In this study, an efficient and practical method termed the laser-enhanced ISD (LEISD) technique of MALDI-FTICR MS allows highly reliable and abundant fragmentation of the neutral oligosaccharides, which was attributed to the ultrahigh irradiation laser of mJ level. The yield of ISD fragmentation was evaluated under different laser powers for 7 neutral oligosaccharides using DHB as matrix. Better quality ISD spectra including fragment ions in low-mass region were obtained at higher laser power. Results from the LEISD of oligosaccharides demonstrated that a significantly better signal-to-noise ratio (S/N) and more structural information could be obtained in comparison to the conventional CID. It was also suggested that the valuable A ions derived from cross-ring cleavage of the linear oligosaccharides allowed the distinction among α(1→4)-, α(1→6)-, β(1→4)-, and β(1→3)-linked isobaric structures according to fragment types and intensities. In addition, ideal fragmentation ions observed by LEISD method facilitated the determination of the sequences and branched points of complex oligosaccharides from human milk.
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Affiliation(s)
- Hongmei Yang
- Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, China
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Walker SH, Papas BN, Comins DL, Muddiman DC. Interplay of permanent charge and hydrophobicity in the electrospray ionization of glycans. Anal Chem 2010; 82:6636-42. [PMID: 20590124 PMCID: PMC4967534 DOI: 10.1021/ac101227a] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
The analysis of N-linked glycans by mass spectrometry (MS) has been characterized by low signal-to-noise ratios and high limits of detection due to their hydrophilicity and lack of basic sites able to be protonated. As a result, every step in glycan sample preparation must be thoroughly optimized in order to minimize sample loss, contamination, and analytical variability. Importantly, properties of glycans and their derivatized counterparts must be thoroughly studied in order to exploit certain characteristics for enhancing MS analysis. Herein, the effectiveness of the incorporation of a permanent charge is studied and determined to hamper glycan analysis. Also, a procedure for glycan hydrazone formation is optimized and outlined where a large number of variables were simultaneously analyzed using a fractional factorial design (FFD) in order to determine which conditions affected the reaction efficiency of the hydrazone formation reaction. Finally, the hydrophobic tagging of glycans is shown to be a viable opportunity to further increase the ion abundance of glycans in MS.
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Affiliation(s)
- S. Hunter Walker
- W.M. Keck FT-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695
| | - Brian N. Papas
- W.M. Keck FT-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695
| | - Daniel L. Comins
- W.M. Keck FT-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695
| | - David C. Muddiman
- W.M. Keck FT-ICR Mass Spectrometry Laboratory, Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695
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Abstract
Glycosylation defines the adhesive properties of animal cell surfaces and the surrounding extracellular environments. Because cells respond to stimuli by altering glycan expression, glycan structures vary according to spatial location in tissue and temporal factors. These dynamic structural expression patterns, combined with the essential roles glycans play in physiology, drive the need for analytical methods for glycoconjugates. In addition, recombinant glycoprotein drug products represent a multibillion dollar market. Effective analytical methods are needed to speed the identification of new targets and the development of industrial glycoprotein products, both new and biosimilar. Mass spectrometry is an enabling technology in glycomics. This review summarizes mass spectrometry of glycoconjugate glycans. The intent is to summarize appropriate methods for glycans given their chemical properties as distinct from those of proteins, lipids, and small molecule metabolites. Special attention is given to the uses of mass spectral profiling for glycomics with respect to the N-linked, O-linked, ganglioside, and glycosaminoglycan compound classes. Next, the uses of tandem mass spectrometry of glycans are summarized. The review finishes with an update on mass spectral glycoproteomics.
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Affiliation(s)
- Joseph Zaia
- Department of Biochemistry, Boston University, Boston, Massachusetts, USA.
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Kolarich D, Packer NH. Mass Spectrometry for the Analysis of Milk Oligosaccharides. MASS SPECTROMETRY AND NUTRITION RESEARCH 2010. [DOI: 10.1039/9781849730921-00059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Mass Spectrometry (MS) has emerged as an indispensable tool for the analysis of biomolecules due to its sensitivity, versatility and ease of applicability to complex samples. Nevertheless, the analysis of free oligosaccharides and protein bound sugars in secretions such as milk poses certain challenges. In this review, the benefits and limitations of different sample preparation approaches for the mass spectrometric analysis of free oligosaccharides and glycoproteins are discussed. Appropriate sample preparation is the first crucial step for successful mass spectrometric analysis. Different MS techniques and instrument combinations already successfully applied to the analysis of milk oligosaccharides are also introduced. Available tandem and MSn applications for the differentiation of structural isomers are described and their limitations discussed. This review is intended to give an overview on the available MS methodology and technology available for analysing various kinds of oligosaccharides in milk.
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Affiliation(s)
- Daniel Kolarich
- Department of Chemistry and Biomolecular Sciences, Macquarie University Sydney NSW 2109 Australia
| | - Nicolle H. Packer
- Department of Chemistry and Biomolecular Sciences, Macquarie University Sydney NSW 2109 Australia
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Karlsson H, Halim A, Teneberg S. Differentiation of glycosphingolipid-derived glycan structural isomers by liquid chromatography/mass spectrometry. Glycobiology 2010; 20:1103-16. [PMID: 20466655 DOI: 10.1093/glycob/cwq070] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Isolation and characterization of glycosphingolipids is of importance in many aspects of glycobiology, but is difficult to achieve due to the high degree of heterogeneity and isomerism present in these compounds. In this study, oligosaccharides obtained from non-acid glycosphingolipids by enzymatic digestion with endoglycoceramidase II of Rhodococcus sp. were analyzed by liquid chromatography/electrospray ionization mass spectrometry using graphitized carbon columns. Resolution of isomeric oligosaccharides was achieved, and the MS(2) analyses gave complete sequence information and allowed differentiation of linkage positions. Diagnostic cross-ring (0,2)A-type fragments have previously been described for GlcNAc substituted on C-4 and for 4-substituted Glc. Diagnostic cross-ring (0,2)A-type fragments were present in the MS(2) spectrum of the H type 2 (Fucalpha2Galbeta4GlcNAcbeta4Galbeta4Glc) pentasaccharide, but not in the MS(2) spectrum of H type 1 pentasaccharide (Fucalpha2Galbeta3GlcNAcbeta4Galbeta4Glc). Cross-ring (0,2)A-type fragments were also obtained from the 4-substituted Glc at the reducing end of the glycosphingolipid-derived oligosaccharides. Oligosaccharides of the globo-series (globotriaose (Galalpha4Galbeta4Glc) and globotetraose (GalNAcbeta3Galalpha4Galbeta4Glc)) and the isoglobo-series (isoglobotriaose (Galalpha3Galbeta4Glc) and isoglobotetraose (GalNAcbeta3Galalpha3Galbeta4Glc)) were also chromatographically resolved on the graphitized carbon column. Furthermore, diagnostic fragment ions from cross-ring (0,2)A-type cleavages were present in the MS(2) spectra of the globo-series oligosaccharides, having a Gal substituted on C-4. The applicability of this method on tissue-derived samples was demonstrated using a non-acid glycosphingolipid fraction from human gastric epithelium and a partially purified non-acid glycosphingolipid fraction from 8 x 10(7) bone marrow-derived mouse dendritic cells. Here, liquid chromatography/mass spectrometry of the oligosaccharides released by endoglycoceramidase allowed tentative identification of a number of glycosphingolipids ranging from tri- to nonaglycosylceramides.
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Affiliation(s)
- Hasse Karlsson
- Institute of Biomedicine, Department of Medical Biochemistry and Cell Biology, University of Gothenburg, P.O. Box 440, S-40530 Göteborg, Sweden
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Prien JM, Prater BD, Cockrill SL. A multi-method approach toward de novo glycan characterization: a Man-5 case study. Glycobiology 2010; 20:629-47. [PMID: 20110246 DOI: 10.1093/glycob/cwq012] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Regulatory agencies' expectations for biotherapeutic approval are becoming more stringent with regard to product characterization, where minor species as low as 0.1% of a given profile are typically identified. The mission of this manuscript is to demonstrate a multi-method approach toward de novo glycan characterization and quantitation, including minor species at or approaching the 0.1% benchmark. Recently, unexpected isomers of the Man(5)GlcNAc(2) (M(5)) were reported (Prien JM, Ashline DJ, Lapadula AJ, Zhang H, Reinhold VN. 2009. The high mannose glycans from bovine ribonuclease B isomer characterization by ion trap mass spectrometry (MS). J Am Soc Mass Spectrom. 20:539-556). In the current study, quantitative analysis of these isomers found in commercial M(5) standard demonstrated that they are in low abundance (<1% of the total) and therefore an exemplary "litmus test" for minor species characterization. A simple workflow devised around three core well-established analytical procedures: (1) fluorescence derivatization; (2) online rapid resolution reversed-phase separation coupled with negative-mode sequential mass spectrometry (RRRP-(-)-MS(n)); and (3) permethylation derivatization with nanospray sequential mass spectrometry (NSI-MS(n)) provides comprehensive glycan structural determination. All methods have limitations; however, a multi-method workflow is an at-line stopgap/solution which mitigates each method's individual shortcoming(s) providing greater opportunity for more comprehensive characterization. This manuscript is the first to demonstrate quantitative chromatographic separation of the M(5) isomers and the use of a commercially available stable isotope variant of 2-aminobenzoic acid to detect and chromatographically resolve multiple M(5) isomers in bovine ribonuclease B. With this multi-method approach, we have the capabilities to comprehensively characterize a biotherapeutic's glycan array in a de novo manner, including structural isomers at >/=0.1% of the total chromatographic peak area.
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Affiliation(s)
- Justin M Prien
- Analytical Sciences, Amgen, Inc., 4000 Nelson Rd., Longmont, CO 80503, USA.
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Chen X, Flynn GC. Gas-phase oligosaccharide nonreducing end (GONE) sequencing and structural analysis by reversed phase HPLC/mass spectrometry with polarity switching. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2009; 20:1821-1833. [PMID: 19631557 DOI: 10.1016/j.jasms.2009.06.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2009] [Revised: 05/21/2009] [Accepted: 06/09/2009] [Indexed: 05/28/2023]
Abstract
Here we describe a technique to obtain all the N-linked oligosaccharide structures from a single reversed-phase (RP) HPLC run using on-line tandem MS in both positive and negative ion modes with polarity switching. Oligosaccharides labeled with 2-aminobenzamide (2AB) were used because they generated good ionization efficiency in both ion polarities. In the positive ion mode, protonated oligosaccharide ions lose sugar residues sequentially from the nonreducing end with each round of MS fragmentation, revealing the oligosaccharide sequence from greatly simplified tandem MS spectra. In the negative ion mode, diagnostic ions, including those from cross-ring cleavages, are readily observed in the MS2 spectra of deprotonated oligosaccharide ions, providing detailed structural information, such as branch composition and linkage positions. Both positive and negative ion modes can be programmed into the same LC/MS experiment through polarity switching of the MS instrument. The gas-phase oligosaccharide nonreducing end (GONE) sequencing data, in combination with the diagnostic ions generated in negative ion tandem MS, allow both sequence and structural information to be obtained for all eluting species during a single RP-HPLC chromatographic run. This technique generates oligosaccharide analyses at high speed and sensitivity, and reveals structural features that can be difficult to obtain by traditional methods.
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Affiliation(s)
- Xiaoyu Chen
- Process and Product Development, Amgen, Inc., Thousand Oaks, California, USA.
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