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Benda D, Beck S, Linscheid MW. Synthesis and characterization of a new MeCAT reagent containing a photocleavable linker for labeling of proteins and peptides in mass spectrometric analyses. Talanta 2019; 192:197-203. [PMID: 30348378 DOI: 10.1016/j.talanta.2018.09.046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 09/10/2018] [Accepted: 09/14/2018] [Indexed: 11/24/2022]
Abstract
The quantification of proteins and peptides becomes more important besides mere identification in modern life sciences. Therefore, we have developed a new reagent that adds to the known metall-coded affinity tagging strategy employed in molecular and elemental mass spectrometry containing a photocleavable linker. A synthesis route was developed that provides the new reagent in good yields. The stability of the synthesized reagents was assessed under different temperature and illumination conditions. Labeling reactions were carried out at peptide and protein level, while also the fragmentation behavior of labeled peptides was assessed. In additional experiments, the photocleavability of the new reagent was examined. Upon irradiation with ultraviolet light, the photoproducts were liberated and could be used for quantification of labeled peptides.
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Affiliation(s)
- David Benda
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany
| | - Sebastian Beck
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Michael W Linscheid
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany
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2
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Abbas IM, Schwaar T, Bienwald F, Weller MG. Predictable Peptide Conjugation Ratios by Activation of Proteins with Succinimidyl Iodoacetate (SIA). Methods Protoc 2017; 1:mps1010002. [PMID: 31164550 PMCID: PMC6526413 DOI: 10.3390/mps1010002] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 09/12/2017] [Accepted: 09/14/2017] [Indexed: 12/30/2022] Open
Abstract
The small heterobifunctional linker succinimidyl iodoacetate (SIA) was examined for the preparation of peptide–protein bioconjugates with predicable conjugation ratios. For many conjugation protocols, the protein is either treated with a reductant to cleave disulfide bonds or is reacted with thiolation chemicals, such as Traut’s reagent. Both approaches are difficult to control, need individual optimization and often lead to unsatisfactory results. In another popular approach, a heterobifunctional linker with a N-hydroxysuccinimide (NHS) and a maleimide functionality is applied to the protein. After the activation of some lysine ε-amino groups with the NHS ester functionality, a cysteine-containing peptide is attached to the activated carrier protein via maleimide. Particularly, the maleimide reaction leads to some unwanted byproducts or even cleavage of the linker. Many protocols end up with conjugates with unpredictable and irreproducible conjugation ratios. In addition, the maleimide-thiol addition product should be assumed immunogenic in vivo. To avoid these and other disadvantages of the maleimide approach, we examined the known linker succinimidyl iodoacetate (SIA) in more detail and developed two protocols, which lead to peptide–protein conjugates with predefined average conjugation ratios. This holds potential to eliminate tedious and expensive optimization steps for the synthesis of a bioconjugate of optimal composition.
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Affiliation(s)
- Ioana M Abbas
- Federal Institute for Materials Research and Testing (BAM), Division 1.5 Protein Analysis, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany.
- Humboldt-Universität zu Berlin, School of Analytical Sciences Adlershof, Unter den Linden 6, 10099 Berlin, Germany.
| | - Timm Schwaar
- Federal Institute for Materials Research and Testing (BAM), Division 1.5 Protein Analysis, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany.
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Frank Bienwald
- Federal Institute for Materials Research and Testing (BAM), Division 1.5 Protein Analysis, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany.
- Humboldt-Universität zu Berlin, Department of Chemistry, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Michael G Weller
- Federal Institute for Materials Research and Testing (BAM), Division 1.5 Protein Analysis, Richard-Willstätter-Strasse 11, 12489 Berlin, Germany.
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El-Khatib AH, He Y, Esteban-Fernández D, Linscheid MW. Application of higher energy collisional dissociation (HCD) to the fragmentation of new DOTA-based labels and N-termini DOTA-labeled peptides. JOURNAL OF MASS SPECTROMETRY : JMS 2017; 52:543-549. [PMID: 28577300 DOI: 10.1002/jms.3954] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2017] [Revised: 05/30/2017] [Accepted: 05/30/2017] [Indexed: 06/07/2023]
Abstract
1,4,7,10-Tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) derivatives are applied in quantitative proteomics owing to their ability to react with different functional groups, to harbor lanthanoides and hence their compatibility with molecular and elemental mass spectrometry. The new DOTA derivatives, namely Ln-MeCAT-Click and Ln-DOTA-Dimedone, allow efficient thiol labeling and targeting sulfenation as an important post-translational modification, respectively. Quantitative applications require the investigation of fragmentation behavior of these reagents. Therefore, the fragmentation behavior of Ln-MeCAT-Click and Ln-DOTA-Dimedone was studied using collision-induced dissociation (CID), infrared multiphoton dissociation (IRMPD) and higher-energy collision dissociation (HCD) using different energy levels, and the efficiency of reporter ion production was estimated. The efficiency of characteristic fragment formation was in the order IRMPD > HCD (normal energy level) > CID. On the other hand, the application of HCD at high energy levels (HCD@HE; NCE > 250%) resulted in a significant increase in reporter ion production (33-54%). This new strategy was successfully applied to generate label-specific reporter ions for DOTA amino labeling at the N-termini and in a quantitative fashion for the estimation of amino:thiol ratio in peptides. Copyright © 2017 John Wiley & Sons, Ltd.
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Affiliation(s)
- A H El-Khatib
- Department of Chemistry, Humboldt-Universitaet zu Berlin, Brook-Taylor Str. 2, 12489, Berlin, Germany
- Department of Analytical Chemistry, Faculty of Pharmacy, Ain Shams University, Organization of African Unity Street, Abassia, 11566, Cairo, Egypt
| | - Y He
- Department of Chemistry, Humboldt-Universitaet zu Berlin, Brook-Taylor Str. 2, 12489, Berlin, Germany
| | - D Esteban-Fernández
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter Str. 11, 12489, Berlin, Germany
| | - M W Linscheid
- Department of Chemistry, Humboldt-Universitaet zu Berlin, Brook-Taylor Str. 2, 12489, Berlin, Germany
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He Y, Esteban-Fernández D, Neumann B, Bergmann U, Bierkandt F, Linscheid MW. Application of MeCAT-Click labeling for protein abundance characterization of E. coli after heat shock experiments. J Proteomics 2016; 136:68-76. [DOI: 10.1016/j.jprot.2015.12.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 12/02/2015] [Accepted: 12/17/2015] [Indexed: 10/22/2022]
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5
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Becker R, Schwarz G, Beck S, Linscheid MW. Software assisted data analysis for relative quantification of differentially metal labeled proteins based on HPLC/ESI-MS and -MS/MS experiments. JOURNAL OF MASS SPECTROMETRY : JMS 2015; 50:1120-1123. [PMID: 26456779 DOI: 10.1002/jms.3627] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2015] [Revised: 06/17/2015] [Accepted: 06/18/2015] [Indexed: 06/05/2023]
Affiliation(s)
- René Becker
- Department of Chemistry, Humboldt-Universitaet zu Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany
| | - Gunnar Schwarz
- Department of Chemistry, Humboldt-Universitaet zu Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany
- Laboratory of Inorganic Chemistry, ETH Zurich, 8093, Zurich, Switzerland
| | - Sebastian Beck
- Department of Chemistry, Humboldt-Universitaet zu Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany
| | - Michael W Linscheid
- Department of Chemistry, Humboldt-Universitaet zu Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany
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Novel approach for labeling of biopolymers with DOTA complexes using in situ click chemistry for quantification. Talanta 2015; 134:468-475. [DOI: 10.1016/j.talanta.2014.11.049] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 11/18/2014] [Accepted: 11/22/2014] [Indexed: 11/21/2022]
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Campanella B, Bramanti E. Detection of proteins by hyphenated techniques with endogenous metal tags and metal chemical labelling. Analyst 2014; 139:4124-53. [DOI: 10.1039/c4an00722k] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The absolute and relative quantitation of proteins plays a fundamental role in modern proteomics, as it is the key to understand still unresolved biological questions in medical and pharmaceutical applications.
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Affiliation(s)
- Beatrice Campanella
- National Research Council of Italy
- C.N.R
- Istituto di Chimica dei Composti Organo Metallici-ICCOM-UOS Pisa
- 56124 Pisa, Italy
| | - Emilia Bramanti
- National Research Council of Italy
- C.N.R
- Istituto di Chimica dei Composti Organo Metallici-ICCOM-UOS Pisa
- 56124 Pisa, Italy
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Benda D, Schwarz G, Beck S, Linscheid MW. Quantification of intact covalently metal labeled proteins using ESI-MS/MS. JOURNAL OF MASS SPECTROMETRY : JMS 2014; 49:13-18. [PMID: 24446258 DOI: 10.1002/jms.3302] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Revised: 10/14/2013] [Accepted: 10/22/2013] [Indexed: 06/03/2023]
Abstract
Mass spectrometric methods matured from the successful qualitative characterization of proteins in complex mixtures into methods for quantitative proteomics often based on chemical tags with stable isotope labeling. In the study presented here, we extended the application of lanthanide-ion-based tags from the quantification using inductively coupled plasma-MS into the quantification of labeled intact proteins using electrospray ionization (ESI)-MS and ESI-MS/MS. We applied the metal chelate tag MeCAT-iodoacetamide (IA) (1,4,7,10-tetraazacyclododecane N,N',N″,N″ '-tetra acetic acid with a IA reactive site). Labeled proteins were separated using C3-reversed phase-high-performance liquid chromatography interfaced to ESI-MS. We could prove that even large proteins were completely labeled at all available cysteine residues using MeCAT-IA with only a small excess of reagent. Fragmentation of labeled proteins either using infrared multiphoton dissociation in Fourier transform ion cyclotron resonance-MS or higher-energy collision dissociation with an Orbitrap gave characteristic fragments. We used these fragments to quantify several intact proteins avoiding digestion. To demonstrate the applicability, human serum albumin was quantified in blood serum. The high-performance liquid chromatography/ESI-MS/MS quantification data were validated using inductively coupled plasma-MS. Because the metal within the tag may be any of the lanthanides, multiplexing capabilities are inherent.
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Affiliation(s)
- David Benda
- Department of Chemistry, Humboldt-Universitaet zu Berlin, Brook-Taylor-Str. 2, 12489, Berlin, Germany
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Schwarz G, Beck S, Benda D, Linscheid MW. MeCAT – comparing relative quantification of alpha lactalbumin using both molecular and elemental mass spectrometry. Analyst 2013; 138:2449-55. [DOI: 10.1039/c3an36602b] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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