1
|
Cheong CSY, Khan SU, Ahmed N, Narayanan K. Identification of dual active sites in Caenorhabditis elegans GANA-1 protein: an ortholog of the human α-GAL a and α-NAGA enzymes. J Biomol Struct Dyn 2022:1-16. [PMID: 35694994 DOI: 10.1080/07391102.2022.2084162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Fabry disease (FD) is caused by a defective α-galactosidase A (α-GAL A) enzyme responsible for breaking down globotriaosylceramide (Gb3). To develop affordable therapeutics, more effort is needed to obtain insights into the underlying mechanism of FD and understanding human α-GAL A structure and function in related animal models. We adopted C. elegans as a model to elucidate the sequence and 3D structure of its GANA-1 enzyme and compared it to human α-GAL A. We constructed GANA-1 3D structure by homology modelling and validated the quality of the predicted GANA-1 structure, followed by computational docking of human ligands. The GANA-1 protein shared sequence similarities up to 42.1% with the human α-GAL A in silico and had dual active sites. GANA-1 homology modelling showed that 11 out of 13 amino acids in the first active site of GANA-1 protein overlapped with the human α-GAL A active site, indicating the prospect for substrate cross-reaction. Computational molecular docking using human ligands like Gb3 (first pocket), 4-nitrophenyl-α-D-galactopyranoside (second pocket), α-galactose (second pocket), and N-acetyl-D-galactosamine (second pocket) showed negative binding energy. This revealed that the ligands were able to bind within both GANA-1 active sites, mimicking the human α-GAL A and α-NAGA enzymes. We identified human compounds with adequate docking scores, predicting robust interactions with the GANA-1 active site. Our data suggested that the C. elegans GANA-1 enzyme may possess structural and functional similarities to human α-GAL A, including an intrinsic capability to metabolize Gb3 deposits.Communicated by Ramaswamy H. Sarma.
Collapse
Affiliation(s)
- Clerance Su Yee Cheong
- School of Science, Monash University Malaysia, Bandar Sunway, Selangor Darul Ehsan, Malaysia
| | - Shafi Ullah Khan
- School of Pharmacy, Monash University Malaysia, Bandar Sunway, Selangor Darul Ehsan, Malaysia.,Department of Pharmacy, Abasyn University, Peshawar, Khyber Pakhtunkhwa, Pakistan.,Product & Process Innovation Department, Qarshi Brands (Pvt) Ltd, District Haripur, Khyber Pakhtunkhwa, Pakistan
| | - Nafees Ahmed
- School of Pharmacy, Monash University Malaysia, Bandar Sunway, Selangor Darul Ehsan, Malaysia.,Tropical Medicine and Biology Multidisciplinary Platform, Monash University Malaysia, Bandar Sunway, Selangor Darul Ehsan, Malaysia
| | - Kumaran Narayanan
- School of Science, Monash University Malaysia, Bandar Sunway, Selangor Darul Ehsan, Malaysia
| |
Collapse
|
2
|
Lupu LM, Wiegand P, Holdschick D, Mihoc D, Maeser S, Rawer S, Völklein F, Malek E, Barka F, Knauer S, Uth C, Hennermann J, Kleinekofort W, Hahn A, Barka G, Przybylski M. Identification and Affinity Determination of Protein-Antibody and Protein-Aptamer Epitopes by Biosensor-Mass Spectrometry Combination. Int J Mol Sci 2021; 22:12832. [PMID: 34884636 PMCID: PMC8657952 DOI: 10.3390/ijms222312832] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2021] [Revised: 11/17/2021] [Accepted: 11/17/2021] [Indexed: 12/24/2022] Open
Abstract
Analytical methods for molecular characterization of diagnostic or therapeutic targets have recently gained high interest. This review summarizes the combination of mass spectrometry and surface plasmon resonance (SPR) biosensor analysis for identification and affinity determination of protein interactions with antibodies and DNA-aptamers. The binding constant (KD) of a protein-antibody complex is first determined by immobilizing an antibody or DNA-aptamer on an SPR chip. A proteolytic peptide mixture is then applied to the chip, and following removal of unbound material by washing, the epitope(s) peptide(s) are eluted and identified by MALDI-MS. The SPR-MS combination was applied to a wide range of affinity pairs. Distinct epitope peptides were identified for the cardiac biomarker myoglobin (MG) both from monoclonal and polyclonal antibodies, and binding constants determined for equine and human MG provided molecular assessment of cross immunoreactivities. Mass spectrometric epitope identifications were obtained for linear, as well as for assembled ("conformational") antibody epitopes, e.g., for the polypeptide chemokine Interleukin-8. Immobilization using protein G substantially improved surface fixation and antibody stabilities for epitope identification and affinity determination. Moreover, epitopes were successfully determined for polyclonal antibodies from biological material, such as from patient antisera upon enzyme replacement therapy of lysosomal diseases. The SPR-MS combination was also successfully applied to identify linear and assembled epitopes for DNA-aptamer interaction complexes of the tumor diagnostic protein C-Met. In summary, the SPR-MS combination has been established as a powerful molecular tool for identification of protein interaction epitopes.
Collapse
Affiliation(s)
- Loredana-Mirela Lupu
- Centre for Analytical Biochemistry and Biomedical Mass Spectrometry (AffyMSLifeChem), and Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany; (L.-M.L.); (P.W.); (D.H.); (D.M.); (S.M.); (S.R.); (E.M.); (W.K.)
| | - Pascal Wiegand
- Centre for Analytical Biochemistry and Biomedical Mass Spectrometry (AffyMSLifeChem), and Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany; (L.-M.L.); (P.W.); (D.H.); (D.M.); (S.M.); (S.R.); (E.M.); (W.K.)
| | - Daria Holdschick
- Centre for Analytical Biochemistry and Biomedical Mass Spectrometry (AffyMSLifeChem), and Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany; (L.-M.L.); (P.W.); (D.H.); (D.M.); (S.M.); (S.R.); (E.M.); (W.K.)
- Department of Engineering & Institute for Microtechnologies (IMTECH), RheinMain University, 65428 Rüsselsheim am Main, Germany;
| | - Delia Mihoc
- Centre for Analytical Biochemistry and Biomedical Mass Spectrometry (AffyMSLifeChem), and Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany; (L.-M.L.); (P.W.); (D.H.); (D.M.); (S.M.); (S.R.); (E.M.); (W.K.)
| | - Stefan Maeser
- Centre for Analytical Biochemistry and Biomedical Mass Spectrometry (AffyMSLifeChem), and Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany; (L.-M.L.); (P.W.); (D.H.); (D.M.); (S.M.); (S.R.); (E.M.); (W.K.)
| | - Stephan Rawer
- Centre for Analytical Biochemistry and Biomedical Mass Spectrometry (AffyMSLifeChem), and Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany; (L.-M.L.); (P.W.); (D.H.); (D.M.); (S.M.); (S.R.); (E.M.); (W.K.)
| | - Friedemann Völklein
- Department of Engineering & Institute for Microtechnologies (IMTECH), RheinMain University, 65428 Rüsselsheim am Main, Germany;
| | - Ebrahim Malek
- Centre for Analytical Biochemistry and Biomedical Mass Spectrometry (AffyMSLifeChem), and Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany; (L.-M.L.); (P.W.); (D.H.); (D.M.); (S.M.); (S.R.); (E.M.); (W.K.)
- Department of Engineering & Institute for Microtechnologies (IMTECH), RheinMain University, 65428 Rüsselsheim am Main, Germany;
| | - Frederik Barka
- Sunchrom GmbH, Industriestr. 18, 61381 Friedrichsdorf, Germany; (F.B.); (G.B.)
| | - Sascha Knauer
- Sulfotools GmbH, Bahnhofsplatz 1, 65428 Rüsselsheim am Main, Germany; (S.K.); (C.U.)
| | - Christina Uth
- Sulfotools GmbH, Bahnhofsplatz 1, 65428 Rüsselsheim am Main, Germany; (S.K.); (C.U.)
| | - Julia Hennermann
- Department of Pediatrics, Universitätsmedizin Mainz, 55130 Mainz, Germany;
| | - Wolfgang Kleinekofort
- Centre for Analytical Biochemistry and Biomedical Mass Spectrometry (AffyMSLifeChem), and Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany; (L.-M.L.); (P.W.); (D.H.); (D.M.); (S.M.); (S.R.); (E.M.); (W.K.)
- Department of Engineering & Institute for Microtechnologies (IMTECH), RheinMain University, 65428 Rüsselsheim am Main, Germany;
| | - Andreas Hahn
- Department of Child Neurology, Justus-Liebig-University Giessen, Feulgenstraße 10-12, 35389 Giessen, Germany;
| | - Günes Barka
- Sunchrom GmbH, Industriestr. 18, 61381 Friedrichsdorf, Germany; (F.B.); (G.B.)
| | - Michael Przybylski
- Centre for Analytical Biochemistry and Biomedical Mass Spectrometry (AffyMSLifeChem), and Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany; (L.-M.L.); (P.W.); (D.H.); (D.M.); (S.M.); (S.R.); (E.M.); (W.K.)
- Department of Engineering & Institute for Microtechnologies (IMTECH), RheinMain University, 65428 Rüsselsheim am Main, Germany;
| |
Collapse
|
3
|
Selvan N, Mehta N, Venkateswaran S, Brignol N, Graziano M, Sheikh MO, McAnany Y, Hung F, Madrid M, Krampetz R, Siano N, Mehta A, Brudvig J, Gotschall R, Weimer JM, Do HV. Endolysosomal N-glycan processing is critical to attain the most active form of the enzyme acid alpha-glucosidase. J Biol Chem 2021; 296:100769. [PMID: 33971197 PMCID: PMC8191302 DOI: 10.1016/j.jbc.2021.100769] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Revised: 04/30/2021] [Accepted: 05/06/2021] [Indexed: 11/17/2022] Open
Abstract
Acid alpha-glucosidase (GAA) is a lysosomal glycogen-catabolizing enzyme, the deficiency of which leads to Pompe disease. Pompe disease can be treated with systemic recombinant human GAA (rhGAA) enzyme replacement therapy (ERT), but the current standard of care exhibits poor uptake in skeletal muscles, limiting its clinical efficacy. Furthermore, it is unclear how the specific cellular processing steps of GAA after delivery to lysosomes impact its efficacy. GAA undergoes both proteolytic cleavage and glycan trimming within the endolysosomal pathway, yielding an enzyme that is more efficient in hydrolyzing its natural substrate, glycogen. Here, we developed a tool kit of modified rhGAAs that allowed us to dissect the individual contributions of glycan trimming and proteolysis on maturation-associated increases in glycogen hydrolysis using in vitro and in cellulo enzyme processing, glycopeptide analysis by MS, and high-pH anion-exchange chromatography with pulsed amperometric detection for enzyme kinetics. Chemical modifications of terminal sialic acids on N-glycans blocked sialidase activity in vitro and in cellulo, thereby preventing downstream glycan trimming without affecting proteolysis. This sialidase-resistant rhGAA displayed only partial activation after endolysosomal processing, as evidenced by reduced catalytic efficiency. We also generated enzymatically deglycosylated rhGAA that was shown to be partially activated despite not undergoing proteolytic processing. Taken together, these data suggest that an optimal rhGAA ERT would require both N-glycan and proteolytic processing to attain the most efficient enzyme for glycogen hydrolysis and treatment of Pompe disease. Future studies should examine the amenability of next-generation ERTs to both types of cellular processing.
Collapse
Affiliation(s)
- Nithya Selvan
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Nickita Mehta
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Suresh Venkateswaran
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Nastry Brignol
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Matthew Graziano
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - M Osman Sheikh
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Yuliya McAnany
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Finn Hung
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Matthew Madrid
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Renee Krampetz
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Nicholas Siano
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Anuj Mehta
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Jon Brudvig
- Pediatrics & Rare Diseases Group, Sanford Research, Sioux Falls, South Dakota, USA
| | - Russell Gotschall
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Jill M Weimer
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA
| | - Hung V Do
- Discovery Science Division, Amicus Therapeutics, Inc., Philadelphia, Pennsylvania, USA.
| |
Collapse
|
4
|
Mihoc D, Lupu LM, Wiegand P, Kleinekofort W, Müller O, Völklein F, Glocker MO, Barka F, Barka G, Przybylski M. Antibody Epitope and Affinity Determination of the Myocardial Infarction Marker Myoglobin by SPR-Biosensor Mass Spectrometry. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2021; 32:106-113. [PMID: 32838528 DOI: 10.1021/jasms.0c00234] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Myoglobin (MG) is a biomarker for heart muscle injury, making it a potential target protein for early detection of myocardial infarction. Elevated myoglobin levels alone have low specificity for acute myocardial infarction (AMI) but in combination with cardiac troponin T have been considered highly efficient diagnostic biomarkers. Myoglobin is a monomeric heme protein with a molecular weight of 17 kDa that is found in skeletal and cardiac tissue as an intracellular storage unit of oxygen. MG consists of eight α-helices connected by loops and a heme group responsible for oxygen-binding. Monoclonal antibodies are widely used analytical tools in biomedical research and have been employed for immunoanalytical detection of MG. However, the epitope(s) recognized by MG antibodies have been hitherto unknown. Precise molecular identification of the epitope(s) recognized by antibodies is of key importance for the development of MG as a diagnostic biomarker. The epitope of a monoclonal MG antibody was identified by proteolytic epitope extraction mass spectrometry in combination with surface plasmon resonance (SPR) biosensor analysis. The MG antibody was immobilized both on an affinity microcolumn and a gold SPR chip. The SPR kinetic analysis provided an affinity-binding constant KD of 270 nM for MG. Binding of a tryptic peptide mixture followed by elution of the epitope from the SPR-MS affinity interface by mild acidification provided a single-epitope peptide located at the C-terminus [146-153] [YKELGFQG] of MG. The specificity and affinity of the epitope were ascertained by synthesis and affinity-mass spectrometric characterization of the epitope peptide.
Collapse
Affiliation(s)
- Delia Mihoc
- Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry (STZ), Marktstrasse 29, 65428 Rüsselsheim am Main, Germany
| | - Loredana-Mirela Lupu
- Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry (STZ), Marktstrasse 29, 65428 Rüsselsheim am Main, Germany
| | - Pascal Wiegand
- Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry (STZ), Marktstrasse 29, 65428 Rüsselsheim am Main, Germany
| | - Wolfgang Kleinekofort
- Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry (STZ), Marktstrasse 29, 65428 Rüsselsheim am Main, Germany
- Institute for Microtechnologies (IMTECH), Rhein Main University, 65428 Rüsselsheim am Main, Germany
| | - Oliver Müller
- Institute for Microtechnologies (IMTECH), Rhein Main University, 65428 Rüsselsheim am Main, Germany
| | - Friedemann Völklein
- Institute for Microtechnologies (IMTECH), Rhein Main University, 65428 Rüsselsheim am Main, Germany
| | - Michael O Glocker
- Department of Immunology, Proteome Centre, Medical University Rostock, Schillingallee 69, 18055 Rostock, Germany
| | - Frederik Barka
- Sunchrom GmbH, Industriestr. 27, 61381 Friedrichsdorf, Germany
| | - Günes Barka
- Sunchrom GmbH, Industriestr. 27, 61381 Friedrichsdorf, Germany
| | - Michael Przybylski
- Steinbeis Transfer Centre for Biopolymer Analysis and Biomedical Mass Spectrometry (STZ), Marktstrasse 29, 65428 Rüsselsheim am Main, Germany
| |
Collapse
|
5
|
Lupu L, Wiegand P, Hüttmann N, Rawer S, Kleinekofort W, Shugureva I, Kichkailo AS, Tomilin FN, Lazarev A, Berezovski MV, Przybylski M. Molecular Epitope Determination of Aptamer Complexes of the Multidomain Protein C-Met by Proteolytic Affinity-Mass Spectrometry. ChemMedChem 2020; 15:363-369. [PMID: 31825565 DOI: 10.1002/cmdc.201900489] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Revised: 11/29/2019] [Indexed: 12/21/2022]
Abstract
C-Met protein is a glycosylated receptor tyrosine kinase of the hepatocyte growth factor (HGF), composed of an α and a β chain. Upon ligand binding, C-Met transmits intracellular signals by a unique multi-substrate docking site. C-Met can be aberrantly activated leading to tumorigenesis and other diseases, and has been recognized as a biomarker in cancer diagnosis. C-Met aptamers have been recently considered a useful tool for detection of cancer biomarkers. Herein we report a molecular interaction study of human C-Met expressed in kidney cells with two DNA aptamers of 60 and 64 bases (CLN0003 and CLN0004), obtained using the SELEX (Systematic Evolution of Ligands by Exponential Enrichment) procedure. Epitope peptides of aptamer-C-Met complexes were identified by proteolytic affinity-mass spectrometry in combination with SPR biosensor analysis (PROTEX-SPR-MS), using high-pressure proteolysis for efficient digestion. High affinities (KD , 80-510 nM) were determined for aptamer-C-Met complexes, with two-step binding suggested by kinetic analysis. A linear epitope, C-Met (381-393) was identified for CLN0004, while the CLN0003 aptamer revealed an assembled epitope comprised of two peptide sequences, C-Met (524-543) and C-Met (557-568). Structure modeling of C-Met-aptamers were consistent with the identified epitopes. Specificities and affinities were ascertained by SPR analysis of the synthetic epitope peptides. The high affinities of aptamers to C-Met, and the specific epitopes revealed render them of high interest for cellular diagnostic studies.
Collapse
Affiliation(s)
- Loredana Lupu
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstraße 29, 65428, Rüsselsheim am Main, Germany
| | - Pascal Wiegand
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstraße 29, 65428, Rüsselsheim am Main, Germany
| | - Nico Hüttmann
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstraße 29, 65428, Rüsselsheim am Main, Germany.,Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Stephan Rawer
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstraße 29, 65428, Rüsselsheim am Main, Germany
| | - Wolfgang Kleinekofort
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstraße 29, 65428, Rüsselsheim am Main, Germany.,Dept. of Engineering Sciences, Rhein Main University, 65428, Rüsselsheim am Main, Germany
| | - Irina Shugureva
- Siberian Federal University, Krasnoyarsk, 66041, Russia.,Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Science", Laboratory for Digital Controlled Drugs and Theranostics, Krasnoyarsk, 660036, Russia
| | - Anna S Kichkailo
- Federal Research Center "Krasnoyarsk Science Center of the Siberian Branch of the Russian Academy of Science", Laboratory for Digital Controlled Drugs and Theranostics, Krasnoyarsk, 660036, Russia
| | - Felix N Tomilin
- Kirensky Institute of Physics, Russian Academy of Sciences Siberian Branch, Krasnoyarsk, 660036, Russia.,Siberian Federal University, Krasnoyarsk, 66041, Russia
| | - Alexander Lazarev
- Pressure Biosciences Inc., 14 Norfolk Ave., South Easton, MA, 02375, USA
| | - Maxim V Berezovski
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Michael Przybylski
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry, Marktstraße 29, 65428, Rüsselsheim am Main, Germany
| |
Collapse
|
6
|
Wiegand P, Lupu L, Hüttmann N, Wack J, Rawer S, Przybylski M, Schmitz K. Epitope Identification and Affinity Determination of an Inhibiting Human Antibody to Interleukin IL8 (CXCL8) by SPR- Biosensor-Mass Spectrometry Combination. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2020; 31:109-116. [PMID: 32881511 DOI: 10.1021/jasms.9b00050] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The polypeptide chemokine Interleukin-8 (IL8) plays a crucial role in inflammatory processes in humans. IL8 is involved in chronic inflammatory lung diseases, rheumatoid arthritis, and cancer. Previous studies have shown that the interaction of IL8 with its natural receptors CXCR1 and CXCR2 is critical in these diseases. Antibodies have been used to study the receptor interaction of IL8; however, the binding epitopes were hitherto unknown. Identification of the antibody epitope(s) could lead to a molecular understanding of the inhibiting mechanism and development of improved inhibitors. Here, we report the epitope identification and the affinity characterization of IL8 to a monoclonal anti-human IL8 antibody inhibiting the receptor binding by a combination of surface plasmon resonance (SPR) biosensor analysis and MALDI-mass spectrometry. SPR determination of IL8 with the immobilized antibody revealed high affinity (KD, 82.2 nM). Epitope identification of IL-8 was obtained by proteolytic epitope-extraction mass spectrometry of the peptide fragments upon high pressure trypsin digestion, using an affinity microcolumn with immobilized anti-IL-8 antibody. MALDI-MS of the affinity-bound peptide elution fraction revealed an assembled (discontinuous) epitope comprising two specific peptides, IL8 [12-20] and IL8 [55-60]. Identical epitope peptides were identified by direct MALDI-MS of the eluted epitope fraction from the immobilized anti-IL8 antibody on the SPR chip. SPR determination of the synthetic epitope peptides provided high affinities confirming their binding specificity. The previously reported finding that the anti-Il8 antibody is inhibiting the IL8-CXCR1 interaction is well consistent with the overlapping region of epitope interactions identified in the present study.
Collapse
Affiliation(s)
- Pascal Wiegand
- Steinbeis Centre for Biopolymer Analysis & Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany
- Techn. Universität Darmstadt, Institute of Organic Chemistry and Biochemistry, Alarich-Weiss-Strasse 8, 64287 Darmstadt, Germany
| | - Loredana Lupu
- Steinbeis Centre for Biopolymer Analysis & Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany
| | - Nico Hüttmann
- Steinbeis Centre for Biopolymer Analysis & Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany
| | - Julia Wack
- Techn. Universität Darmstadt, Institute of Organic Chemistry and Biochemistry, Alarich-Weiss-Strasse 8, 64287 Darmstadt, Germany
| | - Stephan Rawer
- Steinbeis Centre for Biopolymer Analysis & Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany
| | - Michael Przybylski
- Steinbeis Centre for Biopolymer Analysis & Biomedical Mass Spectrometry, Marktstrasse 29, 65428 Rüsselsheim am Main, Germany
| | - Katja Schmitz
- Techn. Universität Darmstadt, Institute of Organic Chemistry and Biochemistry, Alarich-Weiss-Strasse 8, 64287 Darmstadt, Germany
| |
Collapse
|
7
|
Epitope and affinity determination of recombinant Mycobacterium tuberculosis Ag85B antigen towards anti-Ag85 antibodies using proteolytic affinity-mass spectrometry and biosensor analysis. Anal Bioanal Chem 2018; 411:439-448. [PMID: 30498982 DOI: 10.1007/s00216-018-1466-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 10/23/2018] [Accepted: 10/26/2018] [Indexed: 02/08/2023]
Abstract
Tuberculosis (TB) is the first cause of death from infectious diseases worldwide. Only a single anti-TB vaccine is currently available for clinical use, but its efficacy is not achieved with certainty. The aim of this work is to provide a basis for the rational design of a neo-glycoconjugate vaccine against TB. Structural characterization of recombinant antigenic proteins from Mycobacterium tuberculosis (MTB) Ag85B (rAg85B, variants, and semi-synthetic glycoconjugates) was initially carried out. Identification of antibody epitope analyses by proteolytic affinity-mass spectrometry and surface plasmon resonance (SPR) biosensor analyses were performed in order to qualitatively identify and quantitatively characterize interaction structures of the antigens with antibodies from different sources. A commercial monoclonal antibody and polyclonal antibodies from different sources (patients with active TB, vaccinated individuals, and a healthy control) were employed to analyze antigen-antibody interactions. These combined approaches provided the identification of different assembled epitope regions on the recombinant MTB antigens, their affinity binding constants in the interactions with specific antibodies, and revealed the importance of protection from excessive glycosylation. The identified epitope peptides should constitute a suitable basis for the design of new specific target vaccines. Graphical abstract ᅟ.
Collapse
|
8
|
Kukacka Z, Iurascu M, Lupu L, Rusche H, Murphy M, Altamore L, Borri F, Maeser S, Papini AM, Hennermann J, Przybylski M. Antibody Epitope of Human α-Galactosidase A Revealed by Affinity Mass Spectrometry: A Basis for Reversing Immunoreactivity in Enzyme Replacement Therapy of Fabry Disease. ChemMedChem 2018; 13:909-915. [DOI: 10.1002/cmdc.201800094] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2018] [Indexed: 11/07/2022]
Affiliation(s)
- Zdenek Kukacka
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry; 65428 Rüsselsheim am Main Germany
- Department of Chemistry; University of Konstanz; 78457 Konstanz Germany
| | - Marius Iurascu
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry; 65428 Rüsselsheim am Main Germany
- Department of Chemistry; University of Konstanz; 78457 Konstanz Germany
| | - Loredana Lupu
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry; 65428 Rüsselsheim am Main Germany
- Department of Chemistry; University of Konstanz; 78457 Konstanz Germany
| | - Hendrik Rusche
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry; 65428 Rüsselsheim am Main Germany
- Department of Chemistry; University of Konstanz; 78457 Konstanz Germany
| | - Mary Murphy
- Ametek Reichert Technologies; Depew NY 14043 USA
| | - Lorenzo Altamore
- French-Italian Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology; Università degli Studi di Firenze; 50019 Sesto Fiorentino Italy
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 13 50019 Sesto Fiorentino Italy
- PeptLab@UCP and Laboratory of Chemical Biology EA4505; Université Paris-Seine; 5 Mail Gay-Lussac 95031 Cergy-Pontoise France
| | - Fabio Borri
- French-Italian Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology; Università degli Studi di Firenze; 50019 Sesto Fiorentino Italy
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 13 50019 Sesto Fiorentino Italy
- PeptLab@UCP and Laboratory of Chemical Biology EA4505; Université Paris-Seine; 5 Mail Gay-Lussac 95031 Cergy-Pontoise France
| | - Stefan Maeser
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry; 65428 Rüsselsheim am Main Germany
- Department of Chemistry; University of Konstanz; 78457 Konstanz Germany
| | - Anna Maria Papini
- French-Italian Interdepartmental Laboratory of Peptide and Protein Chemistry and Biology; Università degli Studi di Firenze; 50019 Sesto Fiorentino Italy
- Dipartimento di Chimica “Ugo Schiff”; Università degli Studi di Firenze; Via della Lastruccia 13 50019 Sesto Fiorentino Italy
- PeptLab@UCP and Laboratory of Chemical Biology EA4505; Université Paris-Seine; 5 Mail Gay-Lussac 95031 Cergy-Pontoise France
| | - Julia Hennermann
- Department of Pediatrics, Villa Metabolica; Universitätsmedizin Mainz; 55130 Mainz Germany
| | - Michael Przybylski
- Steinbeis Centre for Biopolymer Analysis and Biomedical Mass Spectrometry; 65428 Rüsselsheim am Main Germany
- Department of Chemistry; University of Konstanz; 78457 Konstanz Germany
| |
Collapse
|