1
|
Yoo S, Cheon CK. NANS-CDG: Expanding clinical insights with a novel patient with novel variants. Am J Med Genet A 2024:e63721. [PMID: 38822623 DOI: 10.1002/ajmg.a.63721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 04/29/2024] [Accepted: 05/09/2024] [Indexed: 06/03/2024]
Abstract
N-acetyl-d-neuraminic acid synthase-congenital disorder of glycosylation (NANS-CDG) is a rare autosomal recessive defect in the N-acetyl-neuraminic acid biosynthesis pathway. Herein, we report the first Korean NANS-CDG patient. A 10-year-old boy was referred to our clinic because of incidental radiographic findings indicating spondyloepimetaphyseal dysplasia. The patient had microcephaly, cavum septum pellucidum, and ventriculomegaly at birth, and at 10 years, a very short stature. He had a history of idiopathic chronic immune thrombocytopenia, central adrenal insufficiency, and hypothyroidism since infancy. The first unprovoked seizure occurred at the age of 2 years, and he was subsequently admitted to the hospital frequently because of respiratory infections and intractable seizures. Exome sequencing identified unreported biallelic variants of the NANS gene. Clinical and genetic confirmation of NANS-CDG highlights its expanding phenotypic and genotypic diversity.
Collapse
Affiliation(s)
- Sukdong Yoo
- Department of Pediatrics, School of Medicine, Pusan National University, Yangsan, Korea
- Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Korea
| | - Chong Kun Cheon
- Department of Pediatrics, School of Medicine, Pusan National University, Yangsan, Korea
- Research Institute for Convergence of Biomedical Science and Technology, Pusan National University Yangsan Hospital, Yangsan, Korea
| |
Collapse
|
2
|
Rabbani G, Ahmad A, Zamzami MA, Baothman OA, Hosawi SA, Altayeb H, Shahid Nadeem M, Ahmad V. Fabrication of an affordable and sensitive corticosteroid-binding globulin immunosensor based on electrodeposited gold nanoparticles modified glassy carbon electrode. Bioelectrochemistry 2024; 157:108671. [PMID: 38401223 DOI: 10.1016/j.bioelechem.2024.108671] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 02/09/2024] [Accepted: 02/19/2024] [Indexed: 02/26/2024]
Abstract
Herein, we fabricated an ultrasensitive electrochemical immunosensor for the quantitative detection of corticosteroid-binding globulin (CBG). CBG is a protein that regulates glucocorticoid levels and is an important biomarker for inflammation. A decrease in CBG levels is a key biomarker for inflammatory diseases, such as septic shock. To enhance the electrochemical performance and provide a large surface area for anti-CBG immobilization, we functionalized the glassy carbon electrode surface with AuNPs. Electrochemical characterization methods including cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were used to examine the construction of the fabricated immunosensor. The electrochemical signal demonstrated a remarkable sensitivity to the CBG antigen, with a detection range from 0.01 to 100 μg/mL and a limit of detection of 0.012 μg/mL, making it suitable for both clinical and research applications. This label-free immunosensor offers significant advantages, including high sensitivity, low detection limits and excellent selectivity, making it a promising tool for detecting CBG in complex biological samples. Its potential applications include early disease diagnosis, treatment monitoring and studying CBG-related physiological processes.
Collapse
Affiliation(s)
- Gulam Rabbani
- IT-medical Fusion Center, 350-27 Gumidae-ro, Gumi-si, Gyeongbuk 39253, Republic of Korea.
| | - Abrar Ahmad
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia.
| | - Mazin A Zamzami
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Othman A Baothman
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Salman A Hosawi
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Hisham Altayeb
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Muhammad Shahid Nadeem
- Department of Biochemistry, Faculty of Science, King Abdulaziz University, Jeddah 21452, Saudi Arabia
| | - Varish Ahmad
- Department of Health Information Technology, Faculty of Applied Studies, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| |
Collapse
|
3
|
Chernykh A, Abrahams JL, Grant OC, Kambanis L, Sumer-Bayraktar Z, Ugonotti J, Kawahara R, Corcilius L, Payne RJ, Woods RJ, Thaysen-Andersen M. Position-specific N- and O-glycosylation of the reactive center loop impacts neutrophil elastase-mediated proteolysis of corticosteroid-binding globulin. J Biol Chem 2024; 300:105519. [PMID: 38042488 PMCID: PMC10784704 DOI: 10.1016/j.jbc.2023.105519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 11/20/2023] [Accepted: 11/22/2023] [Indexed: 12/04/2023] Open
Abstract
Corticosteroid-binding globulin (CBG) delivers anti-inflammatory cortisol to inflamed tissues through proteolysis of an exposed reactive center loop (RCL) by neutrophil elastase (NE). We previously demonstrated that RCL-localized Asn347-linked N-glycans impact NE proteolysis, but a comprehensive structure-function characterization of the RCL glycosylation is still required to better understand CBG glycobiology. Herein, we first performed RCL-centric glycoprofiling of serum-derived CBG to elucidate the Asn347-glycans and then used molecular dynamics simulations to study their impact on NE proteolysis. Importantly, we also identified O-glycosylation (di/sialyl T) across four RCL sites (Thr338/Thr342/Thr345/Ser350) of serum CBG close to the NE-targeted Val344-Thr345 cleavage site. A restricted N- and O-glycan co-occurrence pattern on the RCL involving exclusively Asn347 and Thr338 glycosylation was experimentally observed and supported in silico by modeling of a CBG-GalNAc-transferase (GalNAc-T) complex with various RCL glycans. GalNAc-T2 and GalNAc-T3 abundantly expressed by liver and gall bladder, respectively, showed in vitro a capacity to transfer GalNAc (Tn) to multiple RCL sites suggesting their involvement in RCL O-glycosylation. Recombinant CBG was then used to determine roles of RCL O-glycosylation through longitudinal NE-centric proteolysis experiments, which demonstrated that both sialoglycans (disialyl T) and asialoglycans (T) decorating Thr345 inhibit NE proteolysis. Synthetic RCL O-glycopeptides expanded on these findings by showing that Thr345-Tn and Thr342-Tn confer strong and moderate protection against NE cleavage, respectively. Molecular dynamics substantiated that short Thr345-linked O-glycans abrogate NE interactions. In conclusion, we report on biologically relevant CBG RCL glycosylation events, which improve our understanding of mechanisms governing cortisol delivery to inflamed tissues.
Collapse
Affiliation(s)
- Anastasia Chernykh
- School of Natural Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Jodie L Abrahams
- School of Natural Sciences, Macquarie University, Sydney, New South Wales, Australia; Glycosciences Laboratory, Department of Metabolism, Digestion and Reproduction, Imperial College London, London, United Kingdom
| | - Oliver C Grant
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Lucas Kambanis
- School of Chemistry, The University of Sydney, Sydney, New South Wales, Australia; Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, Sydney, New South Wales, Australia
| | - Zeynep Sumer-Bayraktar
- School of Natural Sciences, Macquarie University, Sydney, New South Wales, Australia; Glycometabolic Biochemistry Team, Cluster of Pioneering Research, RIKEN, Wako, Saitama, Japan
| | - Julian Ugonotti
- School of Natural Sciences, Macquarie University, Sydney, New South Wales, Australia
| | - Rebeca Kawahara
- School of Natural Sciences, Macquarie University, Sydney, New South Wales, Australia; Institute for Glyco-core Research (iGCORE), Nagoya University, Nagoya, Japan
| | - Leo Corcilius
- School of Chemistry, The University of Sydney, Sydney, New South Wales, Australia; Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, Sydney, New South Wales, Australia
| | - Richard J Payne
- School of Chemistry, The University of Sydney, Sydney, New South Wales, Australia; Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, Sydney, New South Wales, Australia
| | - Robert J Woods
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Morten Thaysen-Andersen
- School of Natural Sciences, Macquarie University, Sydney, New South Wales, Australia; Institute for Glyco-core Research (iGCORE), Nagoya University, Nagoya, Japan.
| |
Collapse
|
4
|
Lee JH, Meyer EJ, Nenke MA, Falhammar H, Torpy DJ. Corticosteroid-binding globulin (CBG): spatiotemporal distribution of cortisol in sepsis. Trends Endocrinol Metab 2023; 34:181-190. [PMID: 36681594 DOI: 10.1016/j.tem.2023.01.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 01/02/2023] [Indexed: 01/22/2023]
Abstract
Corticosteroid-binding globulin (CBG) is a 50-60 kDa circulating glycoprotein with high affinity for cortisol. CBG is adapted for sepsis; its cortisol binding is reduced reversibly by pyrexia and acidaemia, and reduced irreversibly by neutrophil elastase (NE) cleavage, converting high cortisol-binding affinity CBG to a low affinity form. These characteristics allow for the targeted delivery of immunomodulatory cortisol to tissues at the time and body site where cortisol is required in sepsis and septic shock. In addition, high titer inflammatory cytokines in sepsis suppress CBG hepatic synthesis, increasing the serum free cortisol fraction. Recent clinical studies have highlighted the importance of CBG in septic shock, with CBG deficiency independently associated with mortality.
Collapse
Affiliation(s)
- Jessica H Lee
- Department of Medicine, University of Adelaide, Adelaide, South Australia, Australia
| | - Emily J Meyer
- Department of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, South Australia, Australia; Department of Endocrine and Diabetes, The Queen Elizabeth Hospital, Woodville South, South Australia, Australia
| | - Marne A Nenke
- Department of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, South Australia, Australia; Department of Endocrine and Diabetes, The Queen Elizabeth Hospital, Woodville South, South Australia, Australia
| | - Henrik Falhammar
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden; Department of Endocrinology, Karolinska University Hospital, Stockholm, Sweden.
| | - David J Torpy
- Department of Medicine, University of Adelaide, Adelaide, South Australia, Australia; Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, South Australia, Australia
| |
Collapse
|
5
|
Yung HW, Zhao X, Glover L, Burrin C, Pang PC, Jones CJ, Gill C, Duhig K, Olovsson M, Chappell LC, Haslam SM, Dell A, Burton GJ, Charnock-Jones DS. Perturbation of placental protein glycosylation by endoplasmic reticulum stress promotes maladaptation of maternal hepatic glucose metabolism. iScience 2023; 26:105911. [PMID: 36660474 PMCID: PMC9843443 DOI: 10.1016/j.isci.2022.105911] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Revised: 11/30/2022] [Accepted: 12/28/2022] [Indexed: 12/31/2022] Open
Abstract
Placental hormones orchestrate maternal metabolic adaptations to support pregnancy. We hypothesized that placental ER stress, which characterizes early-onset pre-eclampsia (ePE), compromises glycosylation, reducing hormone bioactivity and these maladaptations predispose the mother to metabolic disease in later life. We demonstrate ER stress reduces the complexity and sialylation of trophoblast protein N-glycosylation, while aberrant glycosylation of vascular endothelial growth factor reduced its bioactivity. ER stress alters the expression of 66 of the 146 genes annotated with "protein glycosylation" and reduces the expression of sialyltransferases. Using mouse placental explants, we show ER stress promotes the secretion of mis-glycosylated glycoproteins. Pregnant mice carrying placentas with junctional zone-specific ER stress have reduced blood glucose, anomalous hepatic glucose metabolism, increased cellular stress and elevated DNA methyltransferase 3A. Using pregnancy-specific glycoproteins as a readout, we also demonstrate aberrant glycosylation of placental proteins in women with ePE, thus providing a mechanistic link between ePE and subsequent maternal metabolic disorders.
Collapse
Affiliation(s)
- Hong Wa Yung
- Centre for Trophoblast Research, University of Cambridge, Cambridge CB2 3EG, UK
| | - Xiaohui Zhao
- Centre for Trophoblast Research, University of Cambridge, Cambridge CB2 3EG, UK
| | - Luke Glover
- Centre for Trophoblast Research, University of Cambridge, Cambridge CB2 3EG, UK
| | - Charlotte Burrin
- Centre for Trophoblast Research, University of Cambridge, Cambridge CB2 3EG, UK
| | - Poh-Choo Pang
- Department of Life Sciences, Imperial College London, London, UK
| | - Carolyn J.P. Jones
- Maternal and Fetal Health Centre, University of Manchester, Manchester Academic Health Sciences Centre, Manchester, UK
| | - Carolyn Gill
- Department of Women and Children’s Health, King’s College London, London, UK
| | - Kate Duhig
- Maternal and Fetal Health Centre, University of Manchester, Manchester Academic Health Sciences Centre, Manchester, UK
- Department of Women and Children’s Health, King’s College London, London, UK
| | - Matts Olovsson
- Department of Women’s and Children’s Health, Uppsala University, Uppsala, Sweden
| | - Lucy C. Chappell
- Department of Women and Children’s Health, King’s College London, London, UK
| | - Stuart M. Haslam
- Department of Life Sciences, Imperial College London, London, UK
| | - Anne Dell
- Department of Life Sciences, Imperial College London, London, UK
| | - Graham J. Burton
- Centre for Trophoblast Research, University of Cambridge, Cambridge CB2 3EG, UK
| | - D. Stephen Charnock-Jones
- Centre for Trophoblast Research, University of Cambridge, Cambridge CB2 3EG, UK
- Department of Obstetrics and Gynaecology, University of Cambridge, Cambridge CB2 0SW, UK
| |
Collapse
|
6
|
Li G, Phetsanthad A, Ma M, Yu Q, Nair A, Zheng Z, Ma F, DeLaney K, Hong S, Li L. Native Ion Mobility-Mass Spectrometry-Enabled Fast Structural Interrogation of Labile Protein Surface Modifications at the Intact Protein Level. Anal Chem 2022; 94:2142-2153. [PMID: 35050568 DOI: 10.1021/acs.analchem.1c04503] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Protein sialylation has been closely linked to many diseases including Alzheimer's disease (AD). It is also broadly implicated in therapeutics operating in a pattern-dependent (e.g., Neu5Ac vs Neu5Gc) manner. However, how the sialylation pattern affects the AD-associated, transferrin-assisted iron/Aβ cellular uptake process remains largely ill-defined. Herein, we report the use of native ion mobility-mass spectrometry (IM-MS)-based fast structural probing methodology, enabling well-controlled, synergistic, and in situ manipulation of mature glycoproteins and attached sialic acids. IM-MS-centered experiments enable the combinatorial interrogation of sialylation effects on Aβ cytotoxicity and the chemical, conformational, and topological stabilities of transferrin. Cell viability experiments suggest that Neu5Gc replacement enhances the transferrin-assisted, iron loading-associated Aβ cytotoxicity. Native gel electrophoresis and IM-MS reveal that sialylation stabilizes transferrin conformation but inhibits its dimerization. Collectively, IM-MS is adapted to capture key sialylation intermediates involved in fine-tuning AD-associated glycoprotein structural microheterogeneity. Our results provide the molecular basis for the importance of sustaining moderate TF sialylation levels, especially Neu5Ac, in promoting iron cellular transportation and rescuing iron-enhanced Aβ cytotoxicity.
Collapse
Affiliation(s)
- Gongyu Li
- Research Center for Analytical Science and Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, China
| | | | | | | | | | - Zhen Zheng
- School of Pharmacy, Tianjin Medical University, Tianjin 300070, China
| | - Fengfei Ma
- Protein Sciences, Discovery Biologics, Merck & Co., Inc., South San Francisco, California 94080, United States
| | | | | | | |
Collapse
|
7
|
Oliveira T, Thaysen-Andersen M, Packer NH, Kolarich D. The Hitchhiker's guide to glycoproteomics. Biochem Soc Trans 2021; 49:1643-1662. [PMID: 34282822 PMCID: PMC8421054 DOI: 10.1042/bst20200879] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2021] [Revised: 06/03/2021] [Accepted: 06/23/2021] [Indexed: 02/06/2023]
Abstract
Protein glycosylation is one of the most common post-translational modifications that are essential for cell function across all domains of life. Changes in glycosylation are considered a hallmark of many diseases, thus making glycoproteins important diagnostic and prognostic biomarker candidates and therapeutic targets. Glycoproteomics, the study of glycans and their carrier proteins in a system-wide context, is becoming a powerful tool in glycobiology that enables the functional analysis of protein glycosylation. This 'Hitchhiker's guide to glycoproteomics' is intended as a starting point for anyone who wants to explore the emerging world of glycoproteomics. The review moves from the techniques that have been developed for the characterisation of single glycoproteins to technologies that may be used for a successful complex glycoproteome characterisation. Examples of the variety of approaches, methodologies, and technologies currently used in the field are given. This review introduces the common strategies to capture glycoprotein-specific and system-wide glycoproteome data from tissues, body fluids, or cells, and a perspective on how integration into a multi-omics workflow enables a deep identification and characterisation of glycoproteins - a class of biomolecules essential in regulating cell function.
Collapse
Affiliation(s)
- Tiago Oliveira
- Institute for Glycomics, Griffith University, Gold Coast Campus, Gold Coast, Queensland, Australia
| | | | - Nicolle H. Packer
- Institute for Glycomics, Griffith University, Gold Coast Campus, Gold Coast, Queensland, Australia
- Department of Molecular Sciences, Macquarie University, Sydney, New South Wales, Australia
- ARC Centre of Excellence for Nanoscale BioPhotonics, Griffith University, QLD and Macquarie University, NSW, Australia
| | - Daniel Kolarich
- Institute for Glycomics, Griffith University, Gold Coast Campus, Gold Coast, Queensland, Australia
- ARC Centre of Excellence for Nanoscale BioPhotonics, Griffith University, QLD and Macquarie University, NSW, Australia
| |
Collapse
|
8
|
Tjondro HC, Ugonotti J, Kawahara R, Chatterjee S, Loke I, Chen S, Soltermann F, Hinneburg H, Parker BL, Venkatakrishnan V, Dieckmann R, Grant OC, Bylund J, Rodger A, Woods RJ, Karlsson-Bengtsson A, Struwe WB, Thaysen-Andersen M. Hyper-truncated Asn355- and Asn391-glycans modulate the activity of neutrophil granule myeloperoxidase. J Biol Chem 2021; 296:100144. [PMID: 33273015 PMCID: PMC7857493 DOI: 10.1074/jbc.ra120.016342] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2020] [Revised: 11/24/2020] [Accepted: 12/03/2020] [Indexed: 12/15/2022] Open
Abstract
Myeloperoxidase (MPO) plays essential roles in neutrophil-mediated immunity via the generation of reactive oxidation products. Complex carbohydrates decorate MPO at discrete sites, but their functional relevance remains elusive. To this end, we have characterised the structure-biosynthesis-activity relationship of neutrophil MPO (nMPO). Mass spectrometry demonstrated that nMPO carries both characteristic under-processed and hyper-truncated glycans. Occlusion of the Asn355/Asn391-glycosylation sites and the Asn323-/Asn483-glycans, located in the MPO dimerisation zone, was found to affect the local glycan processing, thereby providing a molecular basis of the site-specific nMPO glycosylation. Native mass spectrometry, mass photometry and glycopeptide profiling revealed significant molecular complexity of diprotomeric nMPO arising from heterogeneous glycosylation, oxidation, chlorination and polypeptide truncation variants and a previously unreported low-abundance monoprotomer. Longitudinal profiling of maturing, mature, granule-separated and pathogen-stimulated neutrophils demonstrated that nMPO is dynamically expressed during granulopoiesis, unevenly distributed across granules and degranulated upon activation. We also show that proMPO-to-MPO maturation occurs during early/mid-stage granulopoiesis. While similar global MPO glycosylation was observed across conditions, the conserved Asn355-/Asn391-sites displayed elevated glycan hyper-truncation, which correlated with higher enzyme activities of MPO in distinct granule populations. Enzymatic trimming of the Asn355-/Asn391-glycans recapitulated the activity gain and showed that nMPO carrying hyper-truncated glycans at these positions exhibits increased thermal stability, polypeptide accessibility and ceruloplasmin-mediated inhibition potential relative to native nMPO. Finally, molecular modelling revealed that hyper-truncated Asn355-glycans positioned in the MPO-ceruloplasmin interface are critical for uninterrupted inhibition. Here, through an innovative and comprehensive approach, we report novel functional roles of MPO glycans, providing new insight into neutrophil-mediated immunity.
Collapse
Affiliation(s)
- Harry C Tjondro
- Department of Molecular Sciences, Macquarie University, Sydney, New South Wales, Australia; Biomolecular Discovery Research Centre, Macquarie University, Sydney, New South Wales, Australia
| | - Julian Ugonotti
- Department of Molecular Sciences, Macquarie University, Sydney, New South Wales, Australia; Biomolecular Discovery Research Centre, Macquarie University, Sydney, New South Wales, Australia
| | - Rebeca Kawahara
- Department of Molecular Sciences, Macquarie University, Sydney, New South Wales, Australia; Biomolecular Discovery Research Centre, Macquarie University, Sydney, New South Wales, Australia
| | - Sayantani Chatterjee
- Department of Molecular Sciences, Macquarie University, Sydney, New South Wales, Australia; Biomolecular Discovery Research Centre, Macquarie University, Sydney, New South Wales, Australia
| | - Ian Loke
- Cordlife Group Limited, Singapore, Singapore
| | - Siyun Chen
- Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Fabian Soltermann
- Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Hannes Hinneburg
- Department of Molecular Sciences, Macquarie University, Sydney, New South Wales, Australia; Biomolecular Discovery Research Centre, Macquarie University, Sydney, New South Wales, Australia
| | - Benjamin L Parker
- Department of Physiology, University of Melbourne, Melbourne, Victoria, Australia
| | - Vignesh Venkatakrishnan
- Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Regis Dieckmann
- Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Oliver C Grant
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Johan Bylund
- Department of Oral Microbiology and Immunology, Institute of Odontology, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Alison Rodger
- Department of Molecular Sciences, Macquarie University, Sydney, New South Wales, Australia; Biomolecular Discovery Research Centre, Macquarie University, Sydney, New South Wales, Australia
| | - Robert J Woods
- Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia, USA
| | - Anna Karlsson-Bengtsson
- Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Department of Biology and Biological Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Weston B Struwe
- Department of Chemistry, University of Oxford, Oxford, United Kingdom
| | - Morten Thaysen-Andersen
- Department of Molecular Sciences, Macquarie University, Sydney, New South Wales, Australia; Biomolecular Discovery Research Centre, Macquarie University, Sydney, New South Wales, Australia.
| |
Collapse
|
9
|
Meyer EJ, Torpy DJ, Chernykh A, Thaysen-Andersen M, Nenke MA, Lewis JG, Rajapaksha H, Rankin W, Polyak SW. Pyrexia and acidosis act independently of neutrophil elastase reactive center loop cleavage to effect cortisol release from corticosteroid-binding globulin. Protein Sci 2020; 29:2495-2509. [PMID: 33085168 DOI: 10.1002/pro.3982] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 10/20/2020] [Accepted: 10/20/2020] [Indexed: 12/21/2022]
Abstract
Corticosteroid-binding globulin (CBG) transports cortisol and other steroids. High-affinity CBG (haCBG) undergoes proteolysis of the reactive center loop (RCL) by neutrophil elastase (NE) altering conformation to low-affinity CBG (laCBG). Elevated temperature reduces CBG:cortisol binding affinity. Surface plasmon resonance was used to determine binding profiles of 19 steroids to haCBG and laCBG at 25, 37, and 39°C mimicking pyrexia and pH 7.4 and 7.0 mimicking acidosis, pathophysiological conditions relevant to sepsis. An expected 4-8-fold reduction in affinity for cortisol, cortisone, corticosterone, 11-deoxycortisol, progesterone, 17-hydroxyprogesterone, and prednisolone occurred with NE-mediated haCBG-to-laCBG conversion. CBG:cortisol binding affinity was further reduced 3.5-fold at 39°C relative to 37°C, binding affinity was also reduced by acidosis for both haCBG and laCBG. Using a conformational antibody generated against the RCL, we confirmed RCL antibody binding was eliminated by NE cleavage, but preserved in pyrexia and acidosis. Molecular modeling studies performed at 40°C confirmed a critical role for Trp371, positioned within the steroid-binding pocket, in ligand binding. These studies demonstrated CBG binding affinity to range of steroids is ligand specific and is reduced with NE-mediated haCBG-to-laCBG transition. Reduced CBG:cortisol binding occurs with increased temperature and in acidosis. Increased flexibility of the Trp371 side chain is proposed in the thermo-coupling mechanism of cortisol release. The synergy of NE cleavage, pyrexia, and acidosis on CBG:cortisol binding may serve to enhance cortisol delivery to the interstitial space in inflammation.
Collapse
Affiliation(s)
- Emily J Meyer
- Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, South Australia, Australia.,Discipline of Medicine, University of Adelaide, Adelaide, South Australia, Australia.,Department of Endocrinology and Diabetes, The Queen Elizabeth Hospital, Adelaide, South Australia, Australia
| | - David J Torpy
- Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, South Australia, Australia.,Discipline of Medicine, University of Adelaide, Adelaide, South Australia, Australia
| | - Anastasia Chernykh
- Department of Molecular Sciences, Macquarie University, Sydney, New South Wales, Australia
| | | | - Marni A Nenke
- Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, South Australia, Australia.,Discipline of Medicine, University of Adelaide, Adelaide, South Australia, Australia.,Department of Endocrinology and Diabetes, The Queen Elizabeth Hospital, Adelaide, South Australia, Australia
| | - John G Lewis
- Steroid & Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand
| | - Harinda Rajapaksha
- Department of Biochemistry & Genetics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria, Australia
| | - Wayne Rankin
- Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, South Australia, Australia.,Discipline of Medicine, University of Adelaide, Adelaide, South Australia, Australia.,Chemical Pathology Directorate, SA Pathology, Adelaide, South Australia, Australia
| | - Steven W Polyak
- Clinical and Health Sciences, University of South Australia, Adelaide, South Australia, Australia
| |
Collapse
|
10
|
Pralow A, Cajic S, Alagesan K, Kolarich D, Rapp E. State-of-the-Art Glycomics Technologies in Glycobiotechnology. ADVANCES IN BIOCHEMICAL ENGINEERING/BIOTECHNOLOGY 2020; 175:379-411. [PMID: 33112988 DOI: 10.1007/10_2020_143] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Glycosylation affects the properties of biologics; thus regulatory bodies classified it as critical quality attribute and force biopharma industry to capture and control it throughout all phases, from R&D till end of product lifetime. The shift from originators to biosimilars further increases importance and extent of glycoanalysis, which thus increases the need for technology platforms enabling reliable high-throughput and in-depth glycan analysis. In this chapter, we will first summarize on established glycoanalytical methods based on liquid chromatography focusing on hydrophilic interaction chromatography, capillary electrophoresis focusing on multiplexed capillary gel electrophoresis, and mass spectrometry focusing on matrix-assisted laser desorption; we will then highlight two emerging technologies based on porous graphitized carbon liquid chromatography and on ion-mobility mass spectrometry as both are highly promising tools to deliver an additional level of information for in-depth glycan analysis; additionally we elaborate on the advantages and challenges of different glycoanalytical technologies and their complementarity; finally, we briefly review applications thereof to biopharmaceutical products. This chapter provides an overview of current state-of-the-art analytical approaches for glycan characterization of biopharmaceuticals that can be employed to capture glycoprotein heterogeneity in a biopharmaceutical context.
Collapse
Affiliation(s)
- Alexander Pralow
- Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
| | - Samanta Cajic
- Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany
| | - Kathirvel Alagesan
- Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia
| | - Daniel Kolarich
- Institute for Glycomics, Griffith University, Gold Coast, QLD, Australia
- ARC Centre of Excellence in Nanoscale Biophotonics, Griffith University, Gold Coast, QLD, Australia
| | - Erdmann Rapp
- Max Planck Institute for Dynamics of Complex Technical Systems, Magdeburg, Germany.
- glyXera GmbH, Magdeburg, Germany.
| |
Collapse
|
11
|
Ugonotti J, Chatterjee S, Thaysen-Andersen M. Structural and functional diversity of neutrophil glycosylation in innate immunity and related disorders. Mol Aspects Med 2020; 79:100882. [PMID: 32847678 DOI: 10.1016/j.mam.2020.100882] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Accepted: 07/14/2020] [Indexed: 12/11/2022]
Abstract
The granulated neutrophils are abundant innate immune cells that utilize bioactive glycoproteins packed in cytosolic granules to fight pathogenic infections, but the neutrophil glycobiology remains poorly understood. Facilitated by technological advances in glycoimmunology, systems glycobiology and glycoanalytics, a considerable body of literature reporting on novel aspects of neutrophil glycosylation has accumulated. Herein, we summarize the building knowledge of the structural and functional diversity displayed by N- and O-linked glycoproteins spatiotemporally expressed and sequentially brought-into-action across the diverse neutrophil life stages during bone marrow maturation, movements to, from and within the blood circulation and microbicidal processes at the inflammatory sites in peripheral tissues. It transpires that neutrophils abundantly decorate their granule glycoproteins including neutrophil elastase, myeloperoxidase and cathepsin G with peculiar glyco-signatures not commonly reported in other areas of human glycobiology such as hyper-truncated chitobiose core- and paucimannosidic-type N-glycans and monoantennary complex-type N-glycans. Sialyl Lewisx, Lewisx, poly-N-acetyllactosamine extensions and core 1-/2-type O-glycans are also common neutrophil glyco-signatures. Granule-specific glycosylation is another fascinating yet not fully understood feature of neutrophils. Recent literature suggests that unconventional biosynthetic pathways and functions underpin these prominent neutrophil-associated glyco-phenotypes. The impact of glycosylation on key neutrophil effector functions including extravasation, degranulation, phagocytosis and formation of neutrophil extracellular traps during normal physiological conditions and in innate immune-related diseases is discussed. We also highlight new technologies that are expected to further advance neutrophil glycobiology and briefly discuss the untapped diagnostic and therapeutic potential of neutrophil glycosylation that could open avenues to combat the increasingly prevalent innate immune disorders.
Collapse
Affiliation(s)
- Julian Ugonotti
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia; Biomolecular Discovery Research Centre, Macquarie University, Sydney, NSW, 2109, Australia
| | - Sayantani Chatterjee
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia; Biomolecular Discovery Research Centre, Macquarie University, Sydney, NSW, 2109, Australia
| | - Morten Thaysen-Andersen
- Department of Molecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia; Biomolecular Discovery Research Centre, Macquarie University, Sydney, NSW, 2109, Australia.
| |
Collapse
|
12
|
Ciregia F, Baiwir D, Cobraiville G, Dewael T, Mazzucchelli G, Badot V, Di Romana S, Sidiras P, Sokolova T, Durez P, Malaise MG, de Seny D. Glycosylation deficiency of lipopolysaccharide-binding protein and corticosteroid-binding globulin associated with activity and response to treatment for rheumatoid arthritis. J Transl Med 2020; 18:8. [PMID: 31907043 PMCID: PMC6945416 DOI: 10.1186/s12967-019-02188-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2019] [Accepted: 12/23/2019] [Indexed: 01/08/2023] Open
Abstract
BACKGROUND Serum protein glycosylation is an area of investigation in inflammatory arthritic disorders such as rheumatoid arthritis (RA). Indeed, some studies highlighted abnormalities of protein glycosylation in RA. Considering the numerous types of enzymes, monosaccharides and glycosidic linkages, glycosylation is one of the most complex post translational modifications. By this work, we started with a preliminary screening of glycoproteins in serum from RA patients and controls. METHODS In order to isolate glycoproteins from serum, lectin wheat germ agglutinin was used and quantitative differences between patients and controls were investigated by LC-MS/MS. Consequently, we focused our attention on two glycoproteins found in this explorative phase: corticosteroid-binding globulin (CBG) and lipopolysaccharide-binding protein (LBP). The subsequent validation with immunoassays was widened to a larger number of early RA (ERA) patients (n = 90) and well-matched healthy controls (n = 90). RESULTS We observed a significant reduction of CBG and LBP glycosylation in ERA patients compared with healthy controls. Further, after 12 months of treatment, glycosylated CBG and LBP levels increased both to values comparable to those of controls. In addition, these changes were correlated with clinical parameters. CONCLUSIONS This study enables to observe that glycosylation changes of CBG and LBP are related to RA disease activity and its response to treatment.
Collapse
Affiliation(s)
- Federica Ciregia
- Laboratory of Rheumatology, GIGA-I3, University of Liège, CHU de Liège, 4000, Liège, Belgium.
| | - Dominique Baiwir
- GIGA Proteomic Facility, University of Liège, 4000, Liège, Belgium
| | - Gaël Cobraiville
- Laboratory of Rheumatology, GIGA-I3, University of Liège, CHU de Liège, 4000, Liège, Belgium
| | - Thibaut Dewael
- Laboratory of Rheumatology, GIGA-I3, University of Liège, CHU de Liège, 4000, Liège, Belgium
| | - Gabriel Mazzucchelli
- Mass Spectrometry Laboratory, System Biology and Chemical Biology, GIGA-Research, University of Liège, 4000, Liège, Belgium
| | - Valérie Badot
- Department of Rheumatology, CHU Brugmann, 1200, Brussels, Belgium
| | - Silvana Di Romana
- Department of Rheumatology, CHU Saint-Pierre, 1200, Brussels, Belgium
| | - Paschalis Sidiras
- Department of Rheumatology, Hôpital Erasme, Université Libre de Bruxelles, 1200, Brussels, Belgium
| | - Tatiana Sokolova
- Department of Rheumatology, Cliniques Universitaires Saint-Luc, Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain, 1200, Brussels, Belgium
| | - Patrick Durez
- Department of Rheumatology, Cliniques Universitaires Saint-Luc, Institut de Recherche Expérimentale et Clinique (IREC), Université Catholique de Louvain, 1200, Brussels, Belgium
| | - Michel G Malaise
- Laboratory of Rheumatology, GIGA-I3, University of Liège, CHU de Liège, 4000, Liège, Belgium
| | - Dominique de Seny
- Laboratory of Rheumatology, GIGA-I3, University of Liège, CHU de Liège, 4000, Liège, Belgium
| |
Collapse
|
13
|
Hill LA, Sumer-Bayraktar Z, Lewis JG, Morava E, Thaysen-Andersen M, Hammond GL. N-Glycosylation influences human corticosteroid-binding globulin measurements. Endocr Connect 2019; 8:1136-1148. [PMID: 31307013 PMCID: PMC6686952 DOI: 10.1530/ec-19-0242] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 07/15/2019] [Indexed: 11/08/2022]
Abstract
OBJECTIVE Discrepancies in ELISA measurements of human corticosteroid-binding globulin (CBG) using detection monoclonal antibodies that recognize an epitope (9G12) within its reactive center loop (RCL), versus an epitope (12G2) in a different location, have suggested that CBG with a proteolytically cleaved RCL exists in blood samples. We have previously been unable to verify this biochemically, and sought to determine if N-glycosylation differences account for discrepancies in ELISA measurements of CBG. METHODS AND SUBJECTS Molecular biological, biochemical and glycopeptide analyses were used to examine how N-glycosylation at specific sites, including at N347 within the RCL, affect CBG ELISA or steroid-binding capacity assay (BCA) measurements. Plasma from patients with congenital disorders of glycosylation (CDG) was also examined in these assays as examples of N-glycosylation defects. RESULTS We demonstrate that an N-glycan at N347 within the CBG RCL limits the 9G12 antibody from recognizing its epitope, whereas the 12G2 antibody reactivity is unaffected, thereby contributing to discrepancies in ELISA measurements using these two antibodies. Qualitative differences in N-glycosylation at N238 also negatively affect the steroid-binding of CBG in the absence of an N-glycan at N347 caused by a T349A substitution. Desialylation increased both ELISA measurements relative to BCA values. Similarly, plasma CBG levels in both ELISAs were much higher than BCA values in several CDG patients. CONCLUSIONS Plasma CBG measurements are influenced by variations in N-glycosylation. This is important given the increasing number of CDG defects identified recently and because N-glycosylation abnormalities are common in patients with metabolic and liver diseases.
Collapse
Affiliation(s)
- Lesley A Hill
- Departments of Cellular and Physiological Sciences and Obstetrics and Gynaecology, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Zeynep Sumer-Bayraktar
- School of Life and Environmental Science, Charles Perkins Centre, The University of Sydney, Sydney, New South Wales, Australia
| | - John G Lewis
- Canterbury Health Laboratories, Christchurch, New Zealand
| | - Eva Morava
- Mayo Clinic, Department of Clinical Genomics, CIM, Rochester, Minnesota, USA
| | | | - Geoffrey L Hammond
- Departments of Cellular and Physiological Sciences and Obstetrics and Gynaecology, The University of British Columbia, Vancouver, British Columbia, Canada
| |
Collapse
|
14
|
Suga A, Nagae M, Yamaguchi Y. Analysis of protein landscapes around N-glycosylation sites from the PDB repository for understanding the structural basis of N-glycoprotein processing and maturation. Glycobiology 2019; 28:774-785. [PMID: 29931153 DOI: 10.1093/glycob/cwy059] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2017] [Accepted: 06/19/2018] [Indexed: 12/21/2022] Open
Abstract
Asparagine-linked glycans (N-glycans) are attached onto nascent glycoproteins in the endoplasmic reticulum (ER) and subsequently processed by a set of processing enzymes in the ER and Golgi apparatus. Accumulating evidence has shown that not all N-glycans on glycoproteins are uniformly processed into mature forms (hybrid and complex types in mammals) through the ER and Golgi apparatus, and a certain set of glycans remains unprocessed as an "immature" form (high-mannose type in mammals). Much attention has been paid to environmental factors regulating N-glycoprotein maturation, such as the expression levels of glycosyltransferases/glycosidases. On the other hand, the influence of the 3D structure of the carrier glycoprotein on N-glycan maturation has been investigated mostly using individual model glycoproteins. To obtain more insights into N-glycoprotein maturation, we herein analyze glycoprotein structures extracted from the Protein Data Bank. We confirm that site-specific N-glycan processing is largely explained by the solvent accessibility of the glycosylated Asn residue and of the conjugated N-glycan. Potential bias of protein structural features toward immature or mature forms was explored within a range of concentric circles of fully folded glycoproteins. There does appear to be bias in amino acid composition and secondary structure. Most notably, γ-branched amino acid residues (Asn+Asp+Leu) occur more frequently on unstructured loop regions of immature glycoproteins. Structural features of the protein surface around the N-glycosylated site do seem to affect N-glycan processing and maturation.
Collapse
Affiliation(s)
- Akitsugu Suga
- Structural Glycobiology Team, Systems Glycobiology Research Group, RIKEN Global Research Cluster, 2-1 Hirosawa, Wako-City, Saitama, Japan
| | - Masamichi Nagae
- Structural Glycobiology Team, Systems Glycobiology Research Group, RIKEN Global Research Cluster, 2-1 Hirosawa, Wako-City, Saitama, Japan
| | - Yoshiki Yamaguchi
- Structural Glycobiology Team, Systems Glycobiology Research Group, RIKEN Global Research Cluster, 2-1 Hirosawa, Wako-City, Saitama, Japan
| |
Collapse
|
15
|
Hill LA, Vassiliadi DA, Dimopoulou I, Anderson AJ, Boyle LD, Kilgour AHM, Stimson RH, Machado Y, Overall CM, Walker BR, Lewis JG, Hammond GL. Neutrophil elastase-cleaved corticosteroid-binding globulin is absent in human plasma. J Endocrinol 2019; 240:27-39. [PMID: 30452386 PMCID: PMC6347282 DOI: 10.1530/joe-18-0479] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 09/28/2018] [Indexed: 12/24/2022]
Abstract
Corticosteroid-binding globulin (CBG) transports glucocorticoids in blood and is a serine protease inhibitor family member. Human CBG has a reactive center loop (RCL) which, when cleaved by neutrophil elastase (NE), disrupts its steroid-binding activity. Measurements of CBG levels are typically based on steroid-binding capacity or immunoassays. Discrepancies in ELISAs using monoclonal antibodies that discriminate between intact vs RCL-cleaved CBG have been interpreted as evidence that CBG with a cleaved RCL and low affinity for cortisol exists in the circulation. We examined the biochemical properties of plasma CBG in samples with discordant ELISA measurements and sought to identify RCL-cleaved CBG in human blood samples. Plasma CBG-binding capacity and ELISA values were consistent in arterial and venous blood draining skeletal muscle, liver and brain, as well as from a tissue (adipose) expected to contain activated neutrophils in obese individuals. Moreover, RCL-cleaved CBG was undetectable in plasma from critically ill patients, irrespective of whether their ELISA measurements were concordant or discordant. We found no evidence of RCL-cleaved CBG in plasma using a heat-dependent polymerization assay, and CBG that resists immunoprecipitation with a monoclonal antibody designed to specifically recognize an intact RCL, bound steroids with a high affinity. In addition, mass spectrometry confirmed the absence of NE-cleaved CBG in plasma in which ELISA values were highly discordant. Human CBG with a NE-cleaved RCL and low affinity for steroids is absent in blood samples, and CBG ELISA discrepancies likely reflect structural differences that alter epitopes recognized by specific monoclonal antibodies.
Collapse
Affiliation(s)
- Lesley A Hill
- Departments of Cellular and Physiological Sciences and Obstetrics and Gynaecology, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Dimitra A Vassiliadi
- Endocrine Unit, Second Department of Internal Medicine-Research Institute and Diabetes Center, Attiko University Hospital, Athens, Greece
| | - Ioanna Dimopoulou
- Endocrine Unit, Second Department of Internal Medicine-Research Institute and Diabetes Center, Attiko University Hospital, Athens, Greece
| | - Anna J Anderson
- BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Luke D Boyle
- BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Alixe H M Kilgour
- BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Roland H Stimson
- BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Yoan Machado
- Department of Biochemistry and Molecular Biology, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Christopher M Overall
- Department of Biochemistry and Molecular Biology, The University of British Columbia, Vancouver, British Columbia, Canada
| | - Brian R Walker
- BHF Centre for Cardiovascular Science, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
- Institute of Genetic Medicine, Newcastle University, Newcastle upon Tyne, United Kingdom
| | - John G Lewis
- Canterbury Health Laboratories, Christchurch, New Zealand
| | - Geoffrey L Hammond
- Departments of Cellular and Physiological Sciences and Obstetrics and Gynaecology, The University of British Columbia, Vancouver, British Columbia, Canada
- Correspondence should be addressed to G L Hammond:
| |
Collapse
|
16
|
Corticosteroid-binding globulin, induced in testicular Leydig cells by perfluorooctanoic acid, promotes steroid hormone synthesis. Arch Toxicol 2018; 92:2013-2025. [DOI: 10.1007/s00204-018-2207-y] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Accepted: 04/25/2018] [Indexed: 12/19/2022]
|
17
|
Simard M, Underhill C, Hammond GL. Functional implications of corticosteroid-binding globulin N-glycosylation. J Mol Endocrinol 2018; 60:71-84. [PMID: 29273683 PMCID: PMC5793714 DOI: 10.1530/jme-17-0234] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 12/22/2017] [Indexed: 12/21/2022]
Abstract
Corticosteroid-binding globulin (CBG) is a plasma carrier of glucocorticoids. Human and rat CBGs have six N-glycosylation sites. Glycosylation of human CBG influences its steroid-binding activity, and there are N-glycosylation sites in the reactive center loops (RCLs) of human and rat CBGs. Proteolysis of the RCL of human CBG causes a structural change that disrupts steroid binding. We now show that mutations of conserved N-glycosylation sites at N238 in human CBG and N230 in rat CBG disrupt steroid binding. Inhibiting glycosylation by tunicamycin also markedly reduced human and rat CBG steroid-binding activities. Deglycosylation of fully glycosylated human CBG or human CBG with only one N-glycan at N238 with Endo H-reduced steroid-binding affinity, while PNGase F-mediated deglycosylation does not, indicating that steroid binding is preserved by deamidation of N238 when its N-glycan is removed. When expressed in N-acetylglucosaminyltransferase-I-deficient Lec1 cells, human and rat CBGs, and a human CBG mutant with only one glycosylation site at N238, have higher (2-4 fold) steroid-binding affinities than when produced by sialylation-deficient Lec2 cells or glycosylation-competent CHO-S cells. Thus, the presence and composition of an N-glycan in this conserved position both appear to influence the steroid binding of CBG. We also demonstrate that neutrophil elastase cleaves the RCL of human CBG and reduces its steroid-binding capacity more efficiently than does chymotrypsin or the Pseudomonas aeruginosa protease LasB. Moreover, while glycosylation of N347 in the RCL limits these activities, N-glycans at other sites also appear to protect CBG from neutrophil elastase or chymotrypsin.
Collapse
Affiliation(s)
- Marc Simard
- Department of Cellular and Physiological SciencesThe University of British Columbia, Vancouver, British Columbia, Canada
| | - Caroline Underhill
- Department of Cellular and Physiological SciencesThe University of British Columbia, Vancouver, British Columbia, Canada
| | - Geoffrey L Hammond
- Department of Cellular and Physiological SciencesThe University of British Columbia, Vancouver, British Columbia, Canada
| |
Collapse
|
18
|
Verbeeten KC, Ahmet AH. The role of corticosteroid-binding globulin in the evaluation of adrenal insufficiency. J Pediatr Endocrinol Metab 2018; 31:107-115. [PMID: 29194043 DOI: 10.1515/jpem-2017-0270] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 11/01/2017] [Indexed: 12/29/2022]
Abstract
Cortisol is a hydrophobic molecule that is largely bound to corticosteroid-binding globulin (CBG) in the circulation. In the assessment of adrenal insufficiency, many clinicians measure a total serum cortisol level, which assumes that CBG is present in normal concentrations and with a normal binding affinity for cortisol. CBG concentration and affinity are affected by a number of common factors including oral contraceptive pills (OCPs), fever and infection, as well as rare mutations in the serine protease inhibitor A6 (SERPINA6) gene, and as such, total cortisol levels might not be the ideal way to assess adrenal function in all clinical circumstances. This paper reviews the limitations of immunoassay and liquid chromatography-tandem mass spectrometry (LC-MS/MS) in the measurement of total cortisol, the challenges of measuring free serum cortisol directly as well as the difficulties in calculating an estimated free cortisol from total cortisol, CBG and albumin concentrations. Newer approaches to the evaluation of adrenal insufficiency, including the measurement of cortisol and cortisone in the saliva, are discussed and a possible future role for these tests is proposed.
Collapse
|
19
|
Isomeric Separation and Characterisation of Glycoconjugates. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1104:77-99. [DOI: 10.1007/978-981-13-2158-0_5] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
20
|
Pedersen CT, Loke I, Lorentzen A, Wolf S, Kamble M, Kristensen SK, Munch D, Radutoiu S, Spillner E, Roepstorff P, Thaysen-Andersen M, Stougaard J, Dam S. N-glycan maturation mutants in Lotus japonicus for basic and applied glycoprotein research. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2017; 91:394-407. [PMID: 28407380 DOI: 10.1111/tpj.13570] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Revised: 03/27/2017] [Accepted: 04/03/2017] [Indexed: 05/11/2023]
Abstract
Studies of protein N-glycosylation are important for answering fundamental questions on the diverse functions of glycoproteins in plant growth and development. Here we generated and characterised a comprehensive collection of Lotus japonicusLORE1 insertion mutants, each lacking the activity of one of the 12 enzymes required for normal N-glycan maturation in the glycosylation machinery. The inactivation of the individual genes resulted in altered N-glycan patterns as documented using mass spectrometry and glycan-recognising antibodies, indicating successful identification of null mutations in the target glyco-genes. For example, both mass spectrometry and immunoblotting experiments suggest that proteins derived from the α1,3-fucosyltransferase (Lj3fuct) mutant completely lacked α1,3-core fucosylation. Mass spectrometry also suggested that the Lotus japonicus convicilin 2 was one of the main glycoproteins undergoing differential expression/N-glycosylation in the mutants. Demonstrating the functional importance of glycosylation, reduced growth and seed production phenotypes were observed for the mutant plants lacking functional mannosidase I, N-acetylglucosaminyltransferase I, and α1,3-fucosyltransferase, even though the relative protein composition and abundance appeared unaffected. The strength of our N-glycosylation mutant platform is the broad spectrum of resulting glycoprotein profiles and altered physiological phenotypes that can be produced from single, double, triple and quadruple mutants. This platform will serve as a valuable tool for elucidating the functional role of protein N-glycosylation in plants. Furthermore, this technology can be used to generate stable plant mutant lines for biopharmaceutical production of glycoproteins displaying relative homogeneous and mammalian-like N-glycosylation features.
Collapse
Affiliation(s)
- Carina T Pedersen
- Centre for Carbohydrate Recognition and Signalling, Department of Molecular Biology and Genetics, Aarhus University, DK-8000, Aarhus, Denmark
| | - Ian Loke
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia
| | - Andrea Lorentzen
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230, Odense M, Denmark
| | - Sara Wolf
- Department of Engineering, Aarhus University, DK-8000, Aarhus, Denmark
| | - Manoj Kamble
- Centre for Carbohydrate Recognition and Signalling, Department of Molecular Biology and Genetics, Aarhus University, DK-8000, Aarhus, Denmark
| | - Sebastian K Kristensen
- Centre for Carbohydrate Recognition and Signalling, Department of Molecular Biology and Genetics, Aarhus University, DK-8000, Aarhus, Denmark
| | - David Munch
- Centre for Carbohydrate Recognition and Signalling, Department of Molecular Biology and Genetics, Aarhus University, DK-8000, Aarhus, Denmark
| | - Simona Radutoiu
- Centre for Carbohydrate Recognition and Signalling, Department of Molecular Biology and Genetics, Aarhus University, DK-8000, Aarhus, Denmark
| | - Edzard Spillner
- Department of Engineering, Aarhus University, DK-8000, Aarhus, Denmark
| | - Peter Roepstorff
- Department of Biochemistry and Molecular Biology, University of Southern Denmark, DK-5230, Odense M, Denmark
| | - Morten Thaysen-Andersen
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia
| | - Jens Stougaard
- Centre for Carbohydrate Recognition and Signalling, Department of Molecular Biology and Genetics, Aarhus University, DK-8000, Aarhus, Denmark
| | - Svend Dam
- Centre for Carbohydrate Recognition and Signalling, Department of Molecular Biology and Genetics, Aarhus University, DK-8000, Aarhus, Denmark
| |
Collapse
|
21
|
Yap SSL, Nguyen-Khuong T, Rudd PM, Alonso S. Dengue Virus Glycosylation: What Do We Know? Front Microbiol 2017; 8:1415. [PMID: 28791003 PMCID: PMC5524768 DOI: 10.3389/fmicb.2017.01415] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2017] [Accepted: 07/12/2017] [Indexed: 12/04/2022] Open
Abstract
In many infectious diseases caused by either viruses or bacteria, pathogen glycoproteins play important roles during the infection cycle, ranging from entry to successful intracellular replication and host immune evasion. Dengue is no exception. Dengue virus glycoproteins, envelope protein (E) and non-structural protein 1 (NS1) are two popular sub-unit vaccine candidates. E protein on the virion surface is the major target of neutralizing antibodies. NS1 which is secreted during DENV infection has been shown to induce a variety of host responses through its binding to several host factors. However, despite their critical role in disease and protection, the glycosylated variants of these two proteins and their biological importance have remained understudied. In this review, we seek to provide a comprehensive summary of the current knowledge on protein glycosylation in DENV, and its role in virus biogenesis, host cell receptor interaction and disease pathogenesis.
Collapse
Affiliation(s)
- Sally S L Yap
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, and Immunology program, Life Sciences Institute, National University of SingaporeSingapore, Singapore
| | - Terry Nguyen-Khuong
- Analytics Group, Bioprocessing Technology Institute, A∗STARSingapore, Singapore
| | - Pauline M Rudd
- Analytics Group, Bioprocessing Technology Institute, A∗STARSingapore, Singapore
| | - Sylvie Alonso
- Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, and Immunology program, Life Sciences Institute, National University of SingaporeSingapore, Singapore
| |
Collapse
|
22
|
Lewis JG, Elder PA. Monoclonal antibodies to the reactive centre loop (RCL) of human corticosteroid-binding globulin (CBG) can protect against proteolytic cleavage. J Steroid Biochem Mol Biol 2017; 171:247-253. [PMID: 28411181 DOI: 10.1016/j.jsbmb.2017.04.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/03/2017] [Revised: 04/10/2017] [Accepted: 04/10/2017] [Indexed: 11/29/2022]
Abstract
Corticosteroid-binding globulin (CBG) binds most of the cortisol in circulation and is a non-functional member of the family of serine protease inhibitors (serpins) with an exposed elastase sensitive reactive centre loop (RCL). The RCL can be cleaved by human neutrophil elastase, released from activated neutrophils, and can also be cleaved at nearby site(s) by elastase released by Pseudomonas aeruginosa, and at two further sites, also within the RCL, by bovine chymotrypsin. Cleavage of the RCL results in a conformational change accompanied by a marked decrease in affinity for cortisol and hence its release at the site of proteolysis. These cleavages are irreversible and the similar half-lives of cleaved and intact CBG could mean that there may be some advantage in slowing the rate of CBG cleavage in acute inflammation thereby increasing the proportion of intact CBG in circulation. Here we show, for the first time, that pre-incubation of tethered human CBG with two monoclonal antibodies to the RCL of CBG protects against cleavage by all three enzymes. Furthermore, in plasma, pre-incubation with both RCL monoclonal antibodies delays neutrophil elastase cleavage of the RCL and one of these RCL monoclonal antibodies also delays bovine chymotrypsin cleavage of the RCL. These findings may provide a basis and rationale for the concept of the use of RCL antibodies as therapeutic agents to effectively increase the proportion of intact CBG in circulation which may be of benefit in acute inflammation.
Collapse
Affiliation(s)
- John G Lewis
- Steroid & Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand.
| | - Peter A Elder
- Steroid & Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand
| |
Collapse
|
23
|
Harvey DJ. Analysis of carbohydrates and glycoconjugates by matrix-assisted laser desorption/ionization mass spectrometry: An update for 2011-2012. MASS SPECTROMETRY REVIEWS 2017; 36:255-422. [PMID: 26270629 DOI: 10.1002/mas.21471] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2014] [Accepted: 01/15/2015] [Indexed: 06/04/2023]
Abstract
This review is the seventh update of the original article published in 1999 on the application of MALDI mass spectrometry to the analysis of carbohydrates and glycoconjugates and brings coverage of the literature to the end of 2012. General aspects such as theory of the MALDI process, matrices, derivatization, MALDI imaging, and fragmentation are covered in the first part of the review and applications to various structural types constitute the remainder. The main groups of compound are oligo- and poly-saccharides, glycoproteins, glycolipids, glycosides, and biopharmaceuticals. Much of this material is presented in tabular form. Also discussed are medical and industrial applications of the technique, studies of enzyme reactions, and applications to chemical synthesis. © 2015 Wiley Periodicals, Inc. Mass Spec Rev 36:255-422, 2017.
Collapse
Affiliation(s)
- David J Harvey
- Department of Biochemistry, Oxford Glycobiology Institute, University of Oxford, Oxford, OX1 3QU, UK
| |
Collapse
|
24
|
Quantification of N-glycosylation site occupancy status based on labeling/label-free strategies with LC-MS/MS. Talanta 2017; 170:509-513. [PMID: 28501204 DOI: 10.1016/j.talanta.2017.04.053] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Revised: 04/18/2017] [Accepted: 04/21/2017] [Indexed: 12/30/2022]
Abstract
Protein N-glycosylation plays important roles in physiological and pathological processes. Characterizing the site-specific N-glycosylation including N-glycan macroheterogeneity (glycosylation site occupancy) and microheterogeneity (site-specific glycan structure) is important for understanding of glycoprotein biosynthesis and function. N-Glycan macroheterogeneity is a physiological property of glycoprotein and the technical obstacles have restricted research into the regulation and functions of this heterogeneity. Quantification of N-glycosylation site occupancy would uncover the critical role of macroheterogeneity in a variety of biological properties. Liquid chromatography (LC)- mass spectrometry (MS)-based quantification is emerging as a powerful tool for glycosylation characterization. This review summarizes the labeling and label-free quantitative MS approaches for quantifying N-glycosylation site occupancy, including its quantification for target glycoproteins in recent years.
Collapse
|
25
|
Largy E, Cantais F, Van Vyncht G, Beck A, Delobel A. Orthogonal liquid chromatography-mass spectrometry methods for the comprehensive characterization of therapeutic glycoproteins, from released glycans to intact protein level. J Chromatogr A 2017; 1498:128-146. [PMID: 28372839 DOI: 10.1016/j.chroma.2017.02.072] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2016] [Revised: 01/04/2017] [Accepted: 02/28/2017] [Indexed: 01/16/2023]
Abstract
Proteins are increasingly used as therapeutics. Their characterization is challenging due to their size and inherent heterogeneity notably caused by post-translational modifications, among which glycosylation is probably the most prominent. The glycosylation profile of therapeutic proteins must therefore be thoroughly analyzed. Here, we illustrate how the use of a combination of various cutting-edge LC or LC/MS(/MS) methods, and operating at different levels of analysis allows the comprehensive characterization of both the N- and O-glycosylations of therapeutic proteins without the need for other approaches (capillary electrophoresis, MALDI-TOF). This workflow does not call for the use of highly specialized/custom hardware and software nor an extensive knowledge of glycan analysis. Most notably, we present the point of view of a contract research organization, with the constraints associated to the work in a regulated environment (GxP). Two salient points of this work are i) the use of mixed-mode chromatography as a fast and straightforward mean of profiling N-glycans sialylation as well as an orthogonal method to separate N-glycans co-eluting in the HILIC mode; and ii) the use of widepore HILIC/MS to analyze challenging N/O-glycosylation profiles at both the peptide and subunit levels. A particular attention was given to the sample preparations in terms of duration, specificity, versatility, and robustness, as well as the ease of data processing.
Collapse
Affiliation(s)
- Eric Largy
- Quality Assistance sa, Technoparc de Thudinie 2, 6536, Donstiennes, Belgium
| | - Fabrice Cantais
- Quality Assistance sa, Technoparc de Thudinie 2, 6536, Donstiennes, Belgium
| | - Géry Van Vyncht
- Quality Assistance sa, Technoparc de Thudinie 2, 6536, Donstiennes, Belgium
| | - Alain Beck
- Centre d'Immunologie Pierre Fabre (CIPF), 5 Av. Napoléon III, BP 60497, 74164, Saint-Julien-en-Genevois, France
| | - Arnaud Delobel
- Quality Assistance sa, Technoparc de Thudinie 2, 6536, Donstiennes, Belgium.
| |
Collapse
|
26
|
N-glycosylation of human sphingomyelin phosphodiesterase acid-like 3A (SMPDL3A) is essential for stability, secretion and activity. Biochem J 2017; 474:1071-1092. [PMID: 28104755 DOI: 10.1042/bcj20160735] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 01/14/2017] [Accepted: 01/18/2017] [Indexed: 11/17/2022]
Abstract
Sphingomyelin phosphodiesterase acid-like 3A (SMPDL3A) is a recently identified phosphodiesterase, which is a secreted N-linked glycoprotein. SMPDL3A is highly homologous to acid sphingomyelinase (aSMase), but unlike aSMase cannot cleave sphingomyelin. Rather, SMPDL3A hydrolyzes nucleotide tri- and diphosphates and their derivatives. While recent structural studies have shed light on these unexpected substrate preferences, many other aspects of SMPDL3A biology, which may give insight into its function in vivo, remain obscure. Here, we investigate the roles of N-glycosylation in the expression, secretion and activity of human SMPDL3A, using inhibitors of N-glycosylation and site-directed mutagenesis, with either THP-1 macrophages or CHO cells expressing human SMPDL3A. Tunicamycin (TM) treatment resulted in expression of non-glycosylated SMPDL3A that was not secreted, and was largely degraded by the proteasome. Proteasomal inhibition restored levels of SMPDL3A in TM-treated cells, although this non-glycosylated protein lacked phosphodiesterase activity. Enzymatic deglycosylation of purified recombinant SMPDL3A also resulted in significant loss of phosphodiesterase activity. Site-directed mutagenesis of individual N-glycosylation sites in SMPDL3A identified glycosylation of Asn69 and Asn222 as affecting maturation of its N-glycans and secretion. Glycosylation of Asn356 in SMPDL3A, an N-linked site conserved throughout the aSMase-like family, was critical for protection against proteasomal degradation and preservation of enzymatic activity. We provide the first experimental evidence for a predicted 22 residue N-terminal signal peptide in SMPDL3A, which is essential for facilitating glycosylation and is removed from the mature protein secreted from CHO cells. In conclusion, site-specific N-glycosylation is essential for the intracellular stability, secretion and activity of human SMPDL3A.
Collapse
|
27
|
Nenke MA, Zeng A, Meyer EJ, Lewis JG, Rankin W, Johnston J, Kireta S, Jesudason S, Torpy DJ. Differential Effects of Estrogen on Corticosteroid-Binding Globulin Forms Suggests Reduced Cleavage in Pregnancy. J Endocr Soc 2017; 1:202-210. [PMID: 29264477 PMCID: PMC5686768 DOI: 10.1210/js.2016-1094] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Accepted: 02/08/2017] [Indexed: 01/09/2023] Open
Abstract
Corticosteroid-binding globulin (CBG) is secreted as high-affinity CBG (haCBG), which may be cleaved by tissue proteases to low-affinity CBG (laCBG), releasing free cortisol. Pregnancy and the estrogen-based combined oral contraceptive pill (COCP) increase CBG concentrations twofold to threefold. The relative effects of these two hyperestrogenic states on the CBG affinity forms are unknown. We performed an observational study in 30 pregnant women, 27 COCP takers and 23 controls. We analyzed circulating total CBG, haCBG, laCBG, and free and total cortisol concentrations. In pregnancy, total CBG and haCBG were increased compared to controls (both P < 0.0001); however, laCBG concentrations were similar. In COCP takers, total CBG and haCBG were increased [802 ± 41 vs compared to controls (both P < 0.0001)], but laCBG was also increased (P = 0.03). Pregnancy and use of COCP were associated with a comparable rise in haCBG, but laCBG was lower in pregnancy (P < 0.0001). These results were consistent with an estrogen-mediated increase in CBG synthesis in both hyperestrogenemic states but with reduced CBG cleavage in pregnancy relative to the COCP, perhaps due to pregnancy-induced CBG glycosylation. Speculatively, increased circulating haCBG concentrations in pregnancy may provide an increased reservoir of CBG-bound cortisol to prepare for the risk of puerperal infection or allow for cortisol binding in the face of competition from increased circulating progesterone concentrations.
Collapse
Affiliation(s)
| | - Anna Zeng
- Central and Northern Adelaide Renal Transplantation Service, Centre for Clinical and Experimental Transplantation, Royal Adelaide Hospital.,School of Medicine, University of Adelaide, and
| | | | - John G Lewis
- Steroid and Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand
| | - Wayne Rankin
- Endocrine and Metabolic Unit, and.,School of Medicine, University of Adelaide, and.,Chemical Pathology Directorate, SA Pathology, Adelaide, South Australia 5000, Australia; and
| | - Julie Johnston
- Central and Northern Adelaide Renal Transplantation Service, Centre for Clinical and Experimental Transplantation, Royal Adelaide Hospital
| | - Svjetlana Kireta
- Central and Northern Adelaide Renal Transplantation Service, Centre for Clinical and Experimental Transplantation, Royal Adelaide Hospital
| | - Shilpanjali Jesudason
- Central and Northern Adelaide Renal Transplantation Service, Centre for Clinical and Experimental Transplantation, Royal Adelaide Hospital.,School of Medicine, University of Adelaide, and
| | - David J Torpy
- Endocrine and Metabolic Unit, and.,School of Medicine, University of Adelaide, and
| |
Collapse
|
28
|
Zhou S, Dong X, Veillon L, Huang Y, Mechref Y. LC-MS/MS analysis of permethylated N-glycans facilitating isomeric characterization. Anal Bioanal Chem 2017; 409:453-466. [PMID: 27796453 PMCID: PMC5444817 DOI: 10.1007/s00216-016-9996-8] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Revised: 09/23/2016] [Accepted: 09/29/2016] [Indexed: 12/18/2022]
Abstract
The biosynthesis of glycans is a template-free process; hence compositionally identical glycans may contain highly heterogeneous structures. Meanwhile, the functions of glycans in biological processes are significantly influenced by the glycan structure. Structural elucidation of glycans is an essential component of glycobiology. Although NMR is considered the most powerful approach for structural glycan studies, it suffers from low sensitivity and requires highly purified glycans. Although mass spectrometry (MS)-based methods have been applied in numerous glycan structure studies, there are challenges in preserving glycan structure during ionization. Permethylation is an efficient derivatization method that improves glycan structural stability. In this report, permethylated glycans are isomerically separated; thus facilitating structural analysis of a mixture of glycans by LC-MS/MS. Separation by porous graphitic carbon liquid chromatography at high temperatures in conjunction with tandem mass spectrometry (PGC-LC-MS/MS) was utilized for unequivocal characterization of glycan isomers. Glycan fucosylation sites were confidently determined by eliminating fucose rearrangement and assignment of diagnostic ions, achieved by permethylation and PGC-LC at high temperatures, respectively. Assigning monosaccharide residues to specific glycan antennae was also achieved. Galactose linkages were also distinguished from each other by CID/HCD tandem MS. This was attainable because of the different bond energies associated with monosaccharide linkages. Graphical Abstract LC-MS and tandem MS of terminal galactose isomers.
Collapse
Affiliation(s)
- Shiyue Zhou
- Department of Chemistry and Biochemistry, Texas Tech University, Memorial Circle & Boston, Box 41061, Lubbock, TX, 79409-1061, USA
| | - Xue Dong
- Department of Chemistry and Biochemistry, Texas Tech University, Memorial Circle & Boston, Box 41061, Lubbock, TX, 79409-1061, USA
| | - Lucas Veillon
- Department of Chemistry and Biochemistry, Texas Tech University, Memorial Circle & Boston, Box 41061, Lubbock, TX, 79409-1061, USA
| | - Yifan Huang
- Department of Chemistry and Biochemistry, Texas Tech University, Memorial Circle & Boston, Box 41061, Lubbock, TX, 79409-1061, USA
| | - Yehia Mechref
- Department of Chemistry and Biochemistry, Texas Tech University, Memorial Circle & Boston, Box 41061, Lubbock, TX, 79409-1061, USA.
| |
Collapse
|
29
|
Lee LY, Moh ESX, Parker BL, Bern M, Packer NH, Thaysen-Andersen M. Toward Automated N-Glycopeptide Identification in Glycoproteomics. J Proteome Res 2016; 15:3904-3915. [DOI: 10.1021/acs.jproteome.6b00438] [Citation(s) in RCA: 89] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Ling Y. Lee
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW 2109, Australia
| | - Edward S. X. Moh
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW 2109, Australia
| | - Benjamin L. Parker
- Charles
Perkins Centre, School of Molecular Bioscience, The University of Sydney, Sydney, Australia
| | - Marshall Bern
- Protein Metrics
Inc., San Carlos, California 94070, United States
| | - Nicolle H. Packer
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW 2109, Australia
| | - Morten Thaysen-Andersen
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW 2109, Australia
| |
Collapse
|
30
|
Nenke MA, Lewis JG, Rankin W, McWilliams L, Metcalf RG, Proudman SM, Torpy DJ. Reduced corticosteroid-binding globulin cleavage in active rheumatoid arthritis. Clin Endocrinol (Oxf) 2016; 85:369-77. [PMID: 27061835 DOI: 10.1111/cen.13081] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 02/23/2016] [Accepted: 04/05/2016] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Corticosteroid-binding globulin (CBG), the cortisol transport protein, is cleaved from high-affinity (haCBG) to low-affinity (laCBG) CBG at sites of inflammation releasing bioavailable, anti-inflammatory cortisol. Rheumatoid arthritis (RA) is a glucocorticoid-responsive disorder, with paradoxically normal cortisol levels despite elevated inflammatory mediators. Our objective was to determine whether CBG cleavage relates to RA disease activity. We hypothesized that impaired CBG cleavage may limit delivery of free cortisol to inflamed joints in RA. DESIGN Prospective, cross-sectional observational study. SETTING AND PARTICIPANTS Fifty-three patients with RA recruited from a Rheumatology outpatient clinic at a tertiary referral centre in Adelaide, Australia, and 73 healthy controls. MEASUREMENTS Total CBG, haCBG and laCBG, total, free and salivary cortisol, inflammatory markers including interleukin-6 soluble receptor (IL-6sR) and macrophage migration inhibitory factor and clinical measures of disease activity. RESULTS Among patients with RA, a wide range of disease activity scores was observed (DAS28: range 1·2-6·4). laCBG was lower in patients with RA (mean ± SEM); 153 ± 9, compared with healthy controls; 191 ± 8 nmol/l, P = 0·003. Levels of total and haCBG were higher in patients with more severe RA disease activity. Free and total cortisol, free cortisol:IL-6sR ratio and total cortisol:IL-6sR ratio correlated negatively with disease activity. CONCLUSIONS These results suggest that patients with RA have reduced CBG cleavage compared to healthy controls and that cleavage is reduced further with higher RA disease activity. Hence, impaired CBG-mediated delivery of endogenous cortisol may perpetuate chronic inflammation in RA.
Collapse
Affiliation(s)
- Marni A Nenke
- Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, SA, Australia
- Discipline of Medicine, University of Adelaide, Adelaide, SA, Australia
| | - John G Lewis
- Steroid & Immunobiochemistry Laboratory, Canterbury Health Laboratories, Christchurch, New Zealand
| | - Wayne Rankin
- Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, SA, Australia
- Discipline of Medicine, University of Adelaide, Adelaide, SA, Australia
- Chemical Pathology Directorate, SA Pathology, Adelaide, SA, Australia
| | - Leah McWilliams
- Rheumatology Unit, Royal Adelaide Hospital, Adelaide, SA, Australia
| | - Robert G Metcalf
- Rheumatology Unit, Royal Adelaide Hospital, Adelaide, SA, Australia
| | - Susanna M Proudman
- Discipline of Medicine, University of Adelaide, Adelaide, SA, Australia
- Rheumatology Unit, Royal Adelaide Hospital, Adelaide, SA, Australia
| | - David J Torpy
- Endocrine and Metabolic Unit, Royal Adelaide Hospital, Adelaide, SA, Australia
- Discipline of Medicine, University of Adelaide, Adelaide, SA, Australia
| |
Collapse
|
31
|
Sumer-Bayraktar Z, Grant OC, Venkatakrishnan V, Woods RJ, Packer NH, Thaysen-Andersen M. Asn347 Glycosylation of Corticosteroid-binding Globulin Fine-tunes the Host Immune Response by Modulating Proteolysis by Pseudomonas aeruginosa and Neutrophil Elastase. J Biol Chem 2016; 291:17727-42. [PMID: 27339896 PMCID: PMC5016167 DOI: 10.1074/jbc.m116.735258] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Revised: 06/10/2016] [Indexed: 12/23/2022] Open
Abstract
Corticosteroid-binding globulin (CBG) delivers anti-inflammatory cortisol to inflamed tissues upon elastase-based proteolysis of the exposed reactive center loop (RCL). However, the molecular mechanisms that regulate the RCL proteolysis by co-existing host and bacterial elastases in inflamed/infected tissues remain unknown. We document that RCL-localized Asn(347) glycosylation fine-tunes the RCL cleavage rate by human neutrophil elastase (NE) and Pseudomonas aeruginosa elastase (PAE) by different mechanisms. NE- and PAE-generated fragments of native and exoglycosidase-treated blood-derived CBG of healthy individuals were monitored by gel electrophoresis and LC-MS/MS to determine the cleavage site(s) and Asn(347) glycosylation as a function of digestion time. The site-specific (Val(344)-Thr(345)) and rapid (seconds to minutes) NE-based RCL proteolysis was significantly antagonized by several volume-enhancing Asn(347) glycan features (i.e. occupancy, triantennary GlcNAc branching, and α1,6-fucosylation) and augmented by Asn(347) NeuAc-type sialylation (all p < 0.05). In contrast, the inefficient (minutes to hours) PAE-based RCL cleavage, which occurred equally well at Thr(345)-Leu(346) and Asn(347)-Leu(348), was abolished by the presence of Asn(347) glycosylation but was enhanced by sialoglycans on neighboring CBG N-sites. Molecular dynamics simulations of various Asn(347) glycoforms of uncleaved CBG indicated that multiple Asn(347) glycan features are modulating the RCL digestion efficiencies by NE/PAE. Finally, high concentrations of cortisol showed weak bacteriostatic effects toward virulent P. aeruginosa, which may explain the low RCL potency of the abundantly secreted PAE during host infection. In conclusion, site-specific CBG N-glycosylation regulates the bioavailability of cortisol in inflamed environments by fine-tuning the RCL proteolysis by endogenous and exogenous elastases. This study offers new molecular insight into host- and pathogen-based manipulation of the human immune system.
Collapse
Affiliation(s)
- Zeynep Sumer-Bayraktar
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia and
| | - Oliver C Grant
- the Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Vignesh Venkatakrishnan
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia and
| | - Robert J Woods
- the Complex Carbohydrate Research Center, University of Georgia, Athens, Georgia 30602
| | - Nicolle H Packer
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia and
| | - Morten Thaysen-Andersen
- From the Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia and
| |
Collapse
|
32
|
The promise of protein glycosylation for personalised medicine. Biochim Biophys Acta Gen Subj 2016; 1860:1583-95. [DOI: 10.1016/j.bbagen.2016.03.012] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 03/04/2016] [Accepted: 03/05/2016] [Indexed: 12/21/2022]
|
33
|
Péré-Brissaud A, Blanchet X, Delourme D, Pélissier P, Forestier L, Delavaud A, Duprat N, Picard B, Maftah A, Brémaud L. Expression of SERPINA3s in cattle: focus on bovSERPINA3-7 reveals specific involvement in skeletal muscle. Open Biol 2016; 5:150071. [PMID: 26562931 PMCID: PMC4593666 DOI: 10.1098/rsob.150071] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
α₁-Antichymotrypsin is encoded by the unique SERPINA3 gene in humans, while it is encoded by a cluster of eight closely related genes in cattle. BovSERPINA3 proteins present a high degree of similarity and significant divergences in the reactive centre loop (RCL) domains which are responsible for the antiprotease activity. In this study, we analysed their expression patterns in a range of cattle tissues. Even if their expression is ubiquitous, we showed that the expression levels of each serpin vary in different tissues of 15-month-old Charolais bulls. Our results led us to focus on bovSERPINA3-7, one of the two most divergent members of the bovSERPINA3 family. Expression analyses showed that bovSERPINA3-7 protein presents different tissue-specific patterns with diverse degrees of N-glycosylation. Using a specific antibody raised against bovSERPINA3-7, Western blot analysis revealed a specific 96 kDa band in skeletal muscle. BovSERPINA3-7 immunoprecipitation and mass spectrometry revealed that this 96 kDa band corresponds to a complex of bovSERPINA3-7 and creatine kinase M-type. Finally, we reported that the bovSERPINA3-7 protein is present in slow-twitch skeletal myofibres. Precisely, bovSERPINA3-7 specifically colocalized with myomesin at the M-band region of sarcomeres where it could interact with other components such as creatine kinase M-type. This study opens new prospects on the bovSERPINA3-7 function in skeletal muscle and promotes opportunities for further understanding of the physiological role(s) of serpins.
Collapse
Affiliation(s)
| | - Xavier Blanchet
- INRA, Université de Limoges, UMR1061 Génétique Moléculaire Animale, Limoges, France
| | - Didier Delourme
- INRA, Université de Limoges, UMR1061 Génétique Moléculaire Animale, Limoges, France
| | - Patrick Pélissier
- INRA, Université de Limoges, UMR1061 Génétique Moléculaire Animale, Limoges, France
| | - Lionel Forestier
- INRA, Université de Limoges, UMR1061 Génétique Moléculaire Animale, Limoges, France
| | - Arnaud Delavaud
- UMR1213 Herbivores, UMRH-AMUVI, INRA de Clermont Ferrand Theix, St Genès Champanelle, France
| | - Nathalie Duprat
- INRA, Université de Limoges, UMR1061 Génétique Moléculaire Animale, Limoges, France
| | - Brigitte Picard
- UMR1213 Herbivores, UMRH-AMUVI, INRA de Clermont Ferrand Theix, St Genès Champanelle, France
| | - Abderrahman Maftah
- INRA, Université de Limoges, UMR1061 Génétique Moléculaire Animale, Limoges, France
| | - Laure Brémaud
- INRA, Université de Limoges, UMR1061 Génétique Moléculaire Animale, Limoges, France
- e-mail:
| |
Collapse
|
34
|
Thaysen-Andersen M, Chertova E, Bergamaschi C, Moh ESX, Chertov O, Roser J, Sowder R, Bear J, Lifson J, Packer NH, Felber BK, Pavlakis GN. Recombinant human heterodimeric IL-15 complex displays extensive and reproducible N- and O-linked glycosylation. Glycoconj J 2016; 33:417-33. [PMID: 26563299 PMCID: PMC7537637 DOI: 10.1007/s10719-015-9627-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2015] [Revised: 09/30/2015] [Accepted: 10/11/2015] [Indexed: 01/25/2023]
Abstract
Human interleukin 15 (IL-15) circulates in blood as a stable molecular complex with the soluble IL-15 receptor alpha (sIL-15Rα). This heterodimeric IL-15:sIL-15Rα complex (hetIL-15) shows therapeutic potential by promoting the growth, mobilization and activation of lymphocytes and is currently evaluated in clinical trials. Favorable pharmacokinetic properties are associated with the heterodimeric formation and the glycosylation of hetIL-15, which, however, remains largely uncharacterized. We report the site-specific N- and O-glycosylation of two clinically relevant large-scale preparations of HEK293-derived recombinant human hetIL-15. Intact IL-15 and sIL-15Rα and derived glycans and glycopeptides were separately profiled using multiple LC-MS/MS strategies. IL-15 Asn79 and sIL-15Rα Asn107 carried the same repertoire of biosynthetically-related N-glycans covering mostly α1-6-core-fucosylated and β-GlcNAc-terminating complex-type structures. The two potential IL-15 N-glycosylation sites (Asn71 and Asn112) located at the IL-2 receptor interface were unoccupied. Mass analysis of intact IL-15 confirmed its N-glycosylation and suggested that Asn79-glycosylation partially prevents Asn77-deamidation. IL-15 contained no O-glycans, whereas sIL-15Rα was heavily O-glycosylated with partially sialylated core 1 and 2-type mono- to hexasaccharides on Thr2, Thr81, Thr86, Thr156, Ser158, and Ser160. The sialoglycans displayed α2-3- and α2-6-NeuAc-type sialylation. Non-human, potentially immunogenic glycoepitopes (e.g. N-glycolylneuraminic acid and α-galactosylation) were not displayed by hetIL-15. Highly reproducible glycosylation of IL-15 and sIL-15Rα of two batches of hetIL-15 demonstrated consistent manufacturing and purification. In conclusion, we document the heterogeneous and reproducible N- and O-glycosylation of large-scale preparations of the therapeutic candidate hetIL-15. Site-specific mapping of these molecular features is important to evaluate the consistent large-scale production and clinical efficacy of hetIL-15.
Collapse
Affiliation(s)
- M Thaysen-Andersen
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia.
| | - E Chertova
- AIDS and Cancer Virus Program, Leidos Biomedical Research, Inc., Frederick National Laboratory, Frederick, MD, 21702, USA
| | - C Bergamaschi
- Human Retrovirus Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD, 21702, USA
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD, 21702, USA
| | - E S X Moh
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia
| | - O Chertov
- Cancer Research Technology Program, Leidos Biomedical, Inc., Frederick National Laboratory, Frederick, MD, 21702, USA
| | - J Roser
- AIDS and Cancer Virus Program, Leidos Biomedical Research, Inc., Frederick National Laboratory, Frederick, MD, 21702, USA
| | - R Sowder
- AIDS and Cancer Virus Program, Leidos Biomedical Research, Inc., Frederick National Laboratory, Frederick, MD, 21702, USA
| | - J Bear
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD, 21702, USA
| | - J Lifson
- AIDS and Cancer Virus Program, Leidos Biomedical Research, Inc., Frederick National Laboratory, Frederick, MD, 21702, USA
| | - N H Packer
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, NSW, 2109, Australia
| | - B K Felber
- Human Retrovirus Pathogenesis Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD, 21702, USA
| | - G N Pavlakis
- Human Retrovirus Section, Vaccine Branch, Center for Cancer Research, National Cancer Institute at Frederick, Frederick, MD, 21702, USA
| |
Collapse
|
35
|
Hinneburg H, Stavenhagen K, Schweiger-Hufnagel U, Pengelley S, Jabs W, Seeberger PH, Silva DV, Wuhrer M, Kolarich D. The Art of Destruction: Optimizing Collision Energies in Quadrupole-Time of Flight (Q-TOF) Instruments for Glycopeptide-Based Glycoproteomics. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2016; 27:507-19. [PMID: 26729457 PMCID: PMC4756043 DOI: 10.1007/s13361-015-1308-6] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 11/06/2015] [Accepted: 11/09/2015] [Indexed: 05/12/2023]
Abstract
In-depth site-specific investigations of protein glycosylation are the basis for understanding the biological function of glycoproteins. Mass spectrometry-based N- and O-glycopeptide analyses enable determination of the glycosylation site, site occupancy, as well as glycan varieties present on a particular site. However, the depth of information is highly dependent on the applied analytical tools, including glycopeptide fragmentation regimes and automated data analysis. Here, we used a small set of synthetic disialylated, biantennary N-glycopeptides to systematically tune Q-TOF instrument parameters towards optimal energy stepping collision induced dissociation (CID) of glycopeptides. A linear dependency of m/z-ratio and optimal fragmentation energy was found, showing that with increasing m/z-ratio, more energy is required for glycopeptide fragmentation. Based on these optimized fragmentation parameters, a method combining lower- and higher-energy CID was developed, allowing the online acquisition of glycan and peptide-specific fragments within a single tandem MS experiment. We validated this method analyzing a set of human immunoglobulins (IgA1+2, sIgA, IgG1+2, IgE, IgD, IgM) as well as bovine fetuin. These optimized fragmentation parameters also enabled software-assisted glycopeptide assignment of both N- and O-glycopeptides including information about the most abundant glycan compositions, peptide sequence and putative structures. Twenty-six out of 30 N-glycopeptides and four out of five O-glycopeptides carrying >110 different glycoforms could be identified by this optimized LC-ESI tandem MS method with minimal user input. The Q-TOF based glycopeptide analysis platform presented here opens the way to a range of different applications in glycoproteomics research as well as biopharmaceutical development and quality control.
Collapse
Affiliation(s)
- Hannes Hinneburg
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, 14424, Potsdam, Germany
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 22, 14195, Berlin, Germany
| | - Kathrin Stavenhagen
- Division of BioAnalytical Chemistry, VU University Amsterdam, Amsterdam, The Netherlands
| | | | | | | | - Peter H Seeberger
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, 14424, Potsdam, Germany
- Institute of Chemistry and Biochemistry, Freie Universität Berlin, Arnimallee 22, 14195, Berlin, Germany
| | - Daniel Varón Silva
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, 14424, Potsdam, Germany
| | - Manfred Wuhrer
- Division of BioAnalytical Chemistry, VU University Amsterdam, Amsterdam, The Netherlands
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, The Netherlands
| | - Daniel Kolarich
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, 14424, Potsdam, Germany.
| |
Collapse
|
36
|
Zacchi LF, Schulz BL. N-glycoprotein macroheterogeneity: biological implications and proteomic characterization. Glycoconj J 2015; 33:359-76. [DOI: 10.1007/s10719-015-9641-3] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2015] [Revised: 11/04/2015] [Accepted: 11/20/2015] [Indexed: 10/22/2022]
|
37
|
Bae YJ, Kratzsch J. Corticosteroid-binding globulin: modulating mechanisms of bioavailability of cortisol and its clinical implications. Best Pract Res Clin Endocrinol Metab 2015; 29:761-72. [PMID: 26522460 DOI: 10.1016/j.beem.2015.09.001] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Corticosteroid-binding globulin (CBG) is the principal transport protein of glucocorticoids. Approximately 80-90% of serum cortisol binds to CBG with high affinity and only about 5% of cortisol remain unbound and is considered biologically active. CBG seems to modulate and influence the bioavailability of cortisol to local tissues. In this review, we will discuss physicochemical properties of CBG and structure of CBG in the mechanisms of binding and release of cortisol. This review describes several factors affecting CBG functions, such as genetic factors or temperature. Furthermore, clinical implications of CBG abnormalities and the measurement of CBG and its use for assessment of free cortisol levels are described in this review.
Collapse
Affiliation(s)
- Yoon Ju Bae
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University of Leipzig, Paul-List Strasse 13-15, D-04103, Leipzig, Germany.
| | - Juergen Kratzsch
- Institute of Laboratory Medicine, Clinical Chemistry and Molecular Diagnostics, University of Leipzig, Paul-List Strasse 13-15, D-04103, Leipzig, Germany
| |
Collapse
|
38
|
Defaus S, Gupta P, Andreu D, Gutiérrez-Gallego R. Mammalian protein glycosylation--structure versus function. Analyst 2015; 139:2944-67. [PMID: 24779027 DOI: 10.1039/c3an02245e] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Carbohydrates fulfil many common as well as extremely important functions in nature. They show a variety of molecular displays--e.g., free mono-, oligo-, and polysaccharides, glycolipids, proteoglycans, glycoproteins, etc.--with particular roles and localizations in living organisms. Structure-specific peculiarities are so many and diverse that it becomes virtually impossible to cover them all from an analytical perspective. Hence this manuscript, focused on mammalian glycosylation, rather than a complete list of analytical descriptors or recognized functions for carbohydrate structures, comprehensively reviews three central issues in current glycoscience, namely (i) structural analysis of glycoprotein glycans, covering both classical and novel approaches for teasing out the structural puzzle as well as potential pitfalls of these processes; (ii) an overview of functions attributed to carbohydrates, covering from monosaccharide to complex, well-defined epitopes and full glycans, including post-glycosylational modifications, and (iii) recent technical advances allowing structural identification of glycoprotein glycans with simultaneous assignation of biological functions.
Collapse
Affiliation(s)
- S Defaus
- Department of Experimental and Health Sciences, Pompeu Fabra University, Barcelona Biomedical Research Park, 08003 Barcelona, Spain.
| | | | | | | |
Collapse
|
39
|
Xu Y, Bailey UM, Schulz BL. Automated measurement of site-specific N
-glycosylation occupancy with SWATH-MS. Proteomics 2015; 15:2177-86. [DOI: 10.1002/pmic.201400465] [Citation(s) in RCA: 73] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2014] [Revised: 01/08/2015] [Accepted: 02/27/2015] [Indexed: 12/21/2022]
Affiliation(s)
- Ying Xu
- School of Chemistry and Molecular Biosciences; The University of Queensland; Brisbane Queensland Australia
| | - Ulla-Maja Bailey
- School of Chemistry and Molecular Biosciences; The University of Queensland; Brisbane Queensland Australia
| | - Benjamin L. Schulz
- School of Chemistry and Molecular Biosciences; The University of Queensland; Brisbane Queensland Australia
| |
Collapse
|
40
|
Spahn PN, Lewis NE. Systems glycobiology for glycoengineering. Curr Opin Biotechnol 2014; 30:218-24. [PMID: 25202878 DOI: 10.1016/j.copbio.2014.08.004] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2014] [Revised: 08/14/2014] [Accepted: 08/15/2014] [Indexed: 12/21/2022]
Abstract
Glycosylation serves essential functions on many proteins produced in biopharmaceutical manufacturing, making it mandatory to thoroughly consider its biogenesis during the production process. Glycoengineering efforts involve the rational design of glycosylation through adjustments in culturing conditions or genetic modifications. Computational models have been developed to aid this process, aiming to offer cheaper and faster alternatives to costly screening strategies. Recently, these models have been successfully utilized to predict glycosylation of products of industrial relevance. Furthermore, systems-level analyses of glycan diversity are elucidating deeper insights into the mechanisms underlying glycosylation. As computational models of glycosylation continue to be expanded, refined, and leveraged for detailed analysis of glycomics data, they will become invaluable resources for cell line development and glycoengineering.
Collapse
Affiliation(s)
- Philipp N Spahn
- Department of Bioengineering, University of California, San Diego, La Jolla, CA 92093, United States
| | - Nathan E Lewis
- Department of Pediatrics, University of California, San Diego, La Jolla, CA 92093, United States.
| |
Collapse
|
41
|
Simard M, Hill LA, Underhill CM, Keller BO, Villanueva I, Hancock REW, Hammond GL. Pseudomonas aeruginosa elastase disrupts the cortisol-binding activity of corticosteroid-binding globulin. Endocrinology 2014; 155:2900-8. [PMID: 24848868 PMCID: PMC4098004 DOI: 10.1210/en.2014-1055] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The serine protease inhibitor (SERPIN) family member corticosteroid-binding globulin (CBG) is the main carrier of glucocorticoids in plasma. Human CBG mediates the targeted release of cortisol at sites of inflammation through cleavage of its reactive center loop (RCL) by neutrophil elastase. The RCLs of SERPIN family members are targeted by diverse endogenous and exogenous proteases, including several bacterial proteases. We tested different bacteria for their ability to secrete proteases that disrupt CBG cortisol-binding activity, and characterized the responsible protease and site of CBG cleavage. Serum CBG integrity was assessed by Western blotting and cortisol-binding capacity assay. Effects of time, pH, temperature, and protease inhibitors were tested. Proteolytically active proteins from bacterial media were purified by fast protein liquid chromatography, and the active protease and CBG cleavage sites were identified by mass spectrometry. Among the bacteria tested, medium from Pseudomonas aeruginosa actively disrupted the cortisol-binding activity of CBG. This proteolytic activity was inhibited by zinc chelators and occurred most efficiently at pH 7 and elevated physiological temperature (ie, 41°C). Mass spectrometric analysis of a semi-purified fraction of P. aeruginosa media identified the virulence factor LasB as the responsible protease, and this was confirmed by assaying media from LasB-deficient P. aeruginosa. This metalloprotease cleaves the CBG RCL at a major site, distinct from that targeted by neutrophil elastase. Our results suggest that humoral responses to P. aeruginosa infection are influenced by this pathogen's ability to secrete a protease that promotes the release of the anti-inflammatory steroid, cortisol, from its plasma transport protein.
Collapse
Affiliation(s)
- Marc Simard
- Department of Cellular and Physiological Sciences (M.S., L.A.H., C.M.U., G.L.H.), University of British Columbia, Life Sciences Centre, 2350 Health Sciences Mall, Vancouver, British Columbia, Canada, V6T 1Z3; Department of Pathology and Laboratory Medicine (B.O.K.), University of British Columbia, Child and Family Research Institute, 950 W 28th Ave, Vancouver, British Columbia, Canada, V5Z 4H4; Department of Microbiology and Immunology (I.V.), University of British Columbia, Life Sciences Centre, 2350 Health Sciences Mall, Vancouver, British Columbia, Canada, V6T 1Z3; and Department of Microbiology and Immunology (R.E.W.H.), University of British Columbia, Centre for Microbial Diseases and Immunity Research, 2259 Lower Mall Research Station, Vancouver, British Columbia, Canada, V6T 1Z4
| | | | | | | | | | | | | |
Collapse
|
42
|
Thaysen-Andersen M, Packer NH. Advances in LC-MS/MS-based glycoproteomics: getting closer to system-wide site-specific mapping of the N- and O-glycoproteome. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2014; 1844:1437-52. [PMID: 24830338 DOI: 10.1016/j.bbapap.2014.05.002] [Citation(s) in RCA: 158] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/02/2014] [Revised: 04/23/2014] [Accepted: 05/05/2014] [Indexed: 12/22/2022]
Abstract
Site-specific structural characterization of glycoproteins is important for understanding the exact functional relevance of protein glycosylation. Resulting partly from the multiple layers of structural complexity of the attached glycans, the system-wide site-specific characterization of protein glycosylation, defined as glycoproteomics, is still far from trivial leaving the N- and O-linked glycoproteomes significantly under-defined. However, recent years have seen significant advances in glycoproteomics driven, in part, by the developments of dedicated workflows and efficient sample preparation, including glycopeptide enrichment and prefractionation. In addition, glycoproteomics has benefitted from the continuous performance enhancement and more intelligent use of liquid chromatography and tandem mass spectrometry (LC-MS/MS) instrumentation and a wider selection of specialized software tackling the unique challenges of glycoproteomics data. Together these advances promise more streamlined N- and O-linked glycoproteome analysis. Tangible examples include system-wide glycoproteomics studies detecting thousands of intact glycopeptides from hundreds of glycoproteins from diverse biological samples. With a strict focus on the system-wide site-specific analysis of protein N- and O-linked glycosylation, we review the recent advances in LC-MS/MS based glycoproteomics. The review opens with a more general discussion of experimental designs in glycoproteomics and sample preparation prior to LC-MS/MS based data acquisition. Although many challenges still remain, it becomes clear that glycoproteomics, one of the last frontiers in proteomics, is gradually maturing enabling a wider spectrum of researchers to access this new emerging research discipline. The next milestone in analytical glycobiology is being reached allowing the glycoscientist to address the functional importance of protein glycosylation in a system-wide yet protein-specific manner.
Collapse
Affiliation(s)
- Morten Thaysen-Andersen
- Biomolecular Frontiers Research Centre, Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, Australia.
| | - Nicolle H Packer
- Biomolecular Frontiers Research Centre, Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, Australia
| |
Collapse
|
43
|
Liang SY, Wu SW, Pu TH, Chang FY, Khoo KH. An adaptive workflow coupled with Random Forest algorithm to identify intact N-glycopeptides detected from mass spectrometry. Bioinformatics 2014; 30:1908-16. [DOI: 10.1093/bioinformatics/btu139] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023] Open
|
44
|
Chuang VTG, Otagiri M. Photoaffinity labeling of plasma proteins. Molecules 2013; 18:13831-59. [PMID: 24217326 PMCID: PMC6270137 DOI: 10.3390/molecules181113831] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 10/22/2013] [Accepted: 11/04/2013] [Indexed: 12/20/2022] Open
Abstract
Photoaffinity labeling is a powerful technique for identifying a target protein. A high degree of labeling specificity can be achieved with this method in comparison to chemical labeling. Human serum albumin (HSA) and α1-acid glycoprotein (AGP) are two plasma proteins that bind a variety of endogenous and exogenous substances. The ligand binding mechanism of these two proteins is complex. Fatty acids, which are known to be transported in plasma by HSA, cause conformational changes and participate in allosteric ligand binding to HSA. HSA undergoes an N-B transition, a conformational change at alkaline pH, that has been reported to result in increased ligand binding. Attempts have been made to investigate the impact of fatty acids and the N-B transition on ligand binding in HSA using ketoprofen and flunitrazepam as photolabeling agents. Meanwhile, plasma AGP is a mixture of genetic variants of the protein. The photolabeling of AGP with flunitrazepam has been utilized to shed light on the topology of the protein ligand binding site. Furthermore, a review of photoaffinity labeling performed on other major plasma proteins will also be discussed. Using a photoreactive natural ligand as a photolabeling agent to identify target protein in the plasma would reduce non-specific labeling.
Collapse
Affiliation(s)
- Victor Tuan Giam Chuang
- School of Pharmacy, Faculty of Health Sciences, Curtin Health Innovation Research Institute, Curtin University, GPO Box U1987, Perth 6845, WA, Australia
- Authors to whom correspondence should be addressed; E-Mails: (V.T.G.C.); (M.O.); Tel.: +61-8-9266-1983 (V.T.G.C.); Fax: +61-8-9266-2769 (V.T.G.C.); Tel./Fax: +81-96-326-3887 (M.O.)
| | - Masaki Otagiri
- Graduate School of Pharmaceutical Sciences, DDS Research Institute, Sojo University, Kumamoto 860-0082, Japan
- Authors to whom correspondence should be addressed; E-Mails: (V.T.G.C.); (M.O.); Tel.: +61-8-9266-1983 (V.T.G.C.); Fax: +61-8-9266-2769 (V.T.G.C.); Tel./Fax: +81-96-326-3887 (M.O.)
| |
Collapse
|
45
|
Parker BL, Thaysen-Andersen M, Solis N, Scott NE, Larsen MR, Graham ME, Packer NH, Cordwell SJ. Site-Specific Glycan-Peptide Analysis for Determination of N-Glycoproteome Heterogeneity. J Proteome Res 2013; 12:5791-800. [DOI: 10.1021/pr400783j] [Citation(s) in RCA: 140] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Benjamin L. Parker
- Discipline
of Pathology, School of Medical Sciences, The University of Sydney, Sydney 2006, Australia
| | - Morten Thaysen-Andersen
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde 2106, Australia
| | - Nestor Solis
- School
of Molecular Bioscience, The University of Sydney, Sydney 2006, Australia
| | - Nichollas E. Scott
- School
of Molecular Bioscience, The University of Sydney, Sydney 2006, Australia
| | - Martin R. Larsen
- Department of Biochemistry
and Molecular Biology, The University of Southern Denmark, DK-5230, Denmark
| | - Mark E. Graham
- Cell Signalling Unit, Children’s Medical Research Institute, Westmead 2145, Australia
| | - Nicolle H. Packer
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde 2106, Australia
| | - Stuart J. Cordwell
- Discipline
of Pathology, School of Medical Sciences, The University of Sydney, Sydney 2006, Australia
- School
of Molecular Bioscience, The University of Sydney, Sydney 2006, Australia
| |
Collapse
|
46
|
Chan WL, Carrell RW, Zhou A, Read RJ. How changes in affinity of corticosteroid-binding globulin modulate free cortisol concentration. J Clin Endocrinol Metab 2013; 98:3315-22. [PMID: 23783094 PMCID: PMC3813945 DOI: 10.1210/jc.2012-4280] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
CONTEXT Recent studies of corticosteroid-binding globulin (CBG) indicate that it does not merely transport cortisol passively but also actively regulates its release in the circulation. We show how CBG binding affinity can vary to give changes in free cortisol concentration in a physiologically relevant range. OBJECTIVE The objective was to determine how the binding affinity of plasma CBG is affected by glycosylation, changes in body temperature, and the conformational change induced by proteases at sites of inflammation. DESIGN Binding assays were performed over a range of temperatures with plasma and recombinant CBG to determine the contribution of glycosylation. The role of conformational change was assessed by measuring binding affinities of plasma CBG before and after reactive loop cleavage by neutrophil elastase. MAIN OUTCOME MEASURES Determination of binding constants allows calculation of clinically relevant changes in CBG saturation and free cortisol concentrations. RESULTS On reactive loop cleavage at inflammation sites, CBG can continue to act as a buffered source of cortisol, although with a much reduced affinity, to give a potential quadrupling of free cortisol. Predicted increases in systemic free cortisol resulting from elevated body temperatures, previously reported based on affinity measurements using nonglycosylated recombinant CBG, were shown here to be considerably increased using glycosylated plasma CBG, with a doubling for every 2°C rise in body temperature. CONCLUSIONS The ability of CBG to modulate free cortisol levels in blood must be considered in the understanding and management of disease processes, as illustrated here with predictable changes in inflammation and fever.
Collapse
Affiliation(s)
- Wee Lee Chan
- Department of Hematology, University of Cambridge, Cambridge Institute for Medical Research, Cambridge CB2 0XY, United Kingdom
| | | | | | | |
Collapse
|
47
|
Zhou H, Froehlich JW, Briscoe AC, Lee RS. The GlycoFilter: a simple and comprehensive sample preparation platform for proteomics, N-glycomics and glycosylation site assignment. Mol Cell Proteomics 2013; 12:2981-91. [PMID: 23820512 DOI: 10.1074/mcp.m113.027953] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Current strategies to study N-glycoproteins in complex samples are often discrete, focusing on either N-glycans or N-glycosites enriched by sugar-based techniques. In this study we report a simple and rapid sample preparation platform, the GlycoFilter, which allows a comprehensive characterization of N-glycans, N-glycosites, and proteins in a single workflow. Both PNGase F catalyzed de-N-glycosylation and trypsin digestions are accelerated by microwave irradiation and performed sequentially in a single spin filter. Both N-glycans and peptides (including de-N-glycosylated peptides) are separately collected by filtration. The condition to effectively collect complex and heterogeneous N-glycans was established on model glycoproteins, bovine ribonuclease B, bovine fetuin, and human serum IgG. With this platform, the N-glycome, N-glycoproteome and proteome of human urine and plasma were characterized. Overall, a total of 865 and 295 N-glycosites were identified from three pairs of urine and plasma samples, respectively. Many sites were defined unambiguously as partially occupied by the detection of their nonsugar-modified peptides (128 from urine and 61 from plasma), demonstrating that partial occupancy of N-glycosylation occurs frequently. Given the likely high prevalence and variability of partial occupancy, glycoprotein quantification based exclusively on deglycosylated peptides may lead to inaccurate quantification.
Collapse
Affiliation(s)
- Hui Zhou
- Department of Urology and The Proteomics Center, Boston Children's Hospital and Harvard Medical School, Boston, Massachusetts 02115
| | | | | | | |
Collapse
|
48
|
Dam S, Thaysen-Andersen M, Stenkjær E, Lorentzen A, Roepstorff P, Packer NH, Stougaard J. Combined N-glycome and N-glycoproteome analysis of the Lotus japonicus seed globulin fraction shows conservation of protein structure and glycosylation in legumes. J Proteome Res 2013; 12:3383-92. [PMID: 23799247 DOI: 10.1021/pr400224s] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Legume food allergy, such as allergy toward peanuts and soybeans, is a health issue predicted to worsen as dietary advice recommends higher intake of legume-based foods. Lotus japonicus (Lotus) is an established legume plant model system for studies of symbiotic and pathogenic microbial interactions and, due to its well characterized genotype/phenotype and easily manipulated genome, may also be suitable for studies of legume food allergy. Here we present a comprehensive study of the Lotus N-glycoproteome. The global and site-specific N-glycan structures of Lotus seed globulins were analyzed using mass spectrometry-based glycomics and glycoproteomics techniques. In total, 19 N-glycan structures comprising high mannose (∼20%), pauci-mannosidic (∼40%), and complex forms (∼40%) were determined. The pauci-mannosidic and complex N-glycans contained high amounts of the typical plant determinants β-1,2-xylose and α-1,3-fucose. Two abundant Lotus seed N-glycoproteins were site-specifically profiled; a predicted lectin containing two fully occupied N-glycosylation sites carried predominantly pauci-mannosidic structures in different distributions. In contrast, Lotus convicilin storage protein 2 (LCP2) carried exclusively high mannose N-glycans similar to its homologue, Ara h 1, which is the major allergen in peanut. In silico investigation confirmed that peanut Ara h 1 and Lotus LCP2 are highly similar at the primary and higher protein structure levels. Hence, we suggest that Lotus has the potential to serve as a model system for studying the role of seed proteins and their glycosylation in food allergy.
Collapse
Affiliation(s)
- Svend Dam
- Centre for Carbohydrate Recognition and Signalling, Department of Molecular Biology and Genetics, Aarhus University, Gustav Wieds Vej 10, DK-8000 Aarhus C, Denmark
| | | | | | | | | | | | | |
Collapse
|
49
|
Stavenhagen K, Hinneburg H, Thaysen-Andersen M, Hartmann L, Varón Silva D, Fuchser J, Kaspar S, Rapp E, Seeberger PH, Kolarich D. Quantitative mapping of glycoprotein micro-heterogeneity and macro-heterogeneity: an evaluation of mass spectrometry signal strengths using synthetic peptides and glycopeptides. JOURNAL OF MASS SPECTROMETRY : JMS 2013; 48:627-39. [PMID: 23722953 DOI: 10.1002/jms.3210] [Citation(s) in RCA: 117] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2012] [Revised: 03/08/2013] [Accepted: 03/24/2013] [Indexed: 05/04/2023]
Abstract
Mass spectrometry (MS) is used to quantify the relative distribution of glycans attached to particular protein glycosylation sites (micro-heterogeneity) and evaluate the molar site occupancy (macro-heterogeneity) in glycoproteomics. However, the accuracy of MS for such quantitative measurements remains to be clarified. As a key step towards this goal, a panel of related tryptic peptides with and without complex, biantennary, disialylated N-glycans was chemically synthesised by solid-phase peptide synthesis. Peptides mimicking those resulting from enzymatic deglycosylation using PNGase F/A and endo D/F/H were synthetically produced, carrying aspartic acid and N-acetylglucosamine-linked asparagine residues, respectively, at the glycosylation site. The MS ionisation/detection strengths of these pure, well-defined and quantified compounds were investigated using various MS ionisation techniques and mass analysers (ESI-IT, ESI-Q-TOF, MALDI-TOF, ESI/MALDI-FT-ICR-MS). Depending on the ion source/mass analyser, glycopeptides carrying complex-type N-glycans exhibited clearly lower signal strengths (10-50% of an unglycosylated peptide) when equimolar amounts were analysed. Less ionisation/detection bias was observed when the glycopeptides were analysed by nano-ESI and medium-pressure MALDI. The position of the glycosylation site within the tryptic peptides also influenced the signal response, in particular if detected as singly or doubly charged signals. This is the first study to systematically and quantitatively address and determine MS glycopeptide ionisation/detection strengths to evaluate glycoprotein micro-heterogeneity and macro-heterogeneity by label-free approaches. These data form a much needed knowledge base for accurate quantitative glycoproteomics.
Collapse
Affiliation(s)
- Kathrin Stavenhagen
- Department of Biomolecular Systems, Max Planck Institute of Colloids and Interfaces, 14424 Potsdam, Germany
| | | | | | | | | | | | | | | | | | | |
Collapse
|
50
|
Alley WR, Mann BF, Novotny MV. High-sensitivity analytical approaches for the structural characterization of glycoproteins. Chem Rev 2013; 113:2668-732. [PMID: 23531120 PMCID: PMC3992972 DOI: 10.1021/cr3003714] [Citation(s) in RCA: 239] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- William R. Alley
- Department of Chemistry, Indiana University, Bloomington, Indiana, United States
- National Center for Glycomics and Glycoproteomics, Indiana University, Bloomington, Indiana, United States
| | - Benjamin F. Mann
- Department of Chemistry, Indiana University, Bloomington, Indiana, United States
- National Center for Glycomics and Glycoproteomics, Indiana University, Bloomington, Indiana, United States
| | - Milos V. Novotny
- Department of Chemistry, Indiana University, Bloomington, Indiana, United States
- National Center for Glycomics and Glycoproteomics, Indiana University, Bloomington, Indiana, United States
- Indiana University School of Medicine, Indiana University, Indianapolis, Indiana, United States
| |
Collapse
|