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Rezaee MA, Rasaee MJ, Mohammadnejad J. Selection of specific inhibitor peptides in enzyme-linked immunosorbent assay (ELISA) of cardiac troponin I using immuno-dominant epitopes as competitor. J Immunoassay Immunochem 2016; 38:72-81. [DOI: 10.1080/15321819.2016.1216444] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Majid Asiabanha Rezaee
- Department of Clinical Biochemistry, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Mohammad Javad Rasaee
- Department of Clinical Biochemistry, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Javad Mohammadnejad
- Department of Life Science Engineering, Faculty of New Sciences and Technologies, University of Tehran, Tehran, Iran
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Regulating the contraction of insect flight muscle. J Muscle Res Cell Motil 2011; 32:303-13. [PMID: 22105701 DOI: 10.1007/s10974-011-9278-1] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2011] [Accepted: 11/11/2011] [Indexed: 10/15/2022]
Abstract
The rapid movement of the wings in small insects is powered by the indirect flight muscles. These muscles are capable of contracting at up to 1,000 Hz because they are activated mechanically by stretching. The mechanism is so efficient that it is also used in larger insects like the waterbug, Lethocerus. The oscillatory activity of the muscles occurs a low concentration of Ca(2+), which stays constant as the muscles contract and relax. Activation by stretch requires particular isoforms of tropomyosin and the troponin complex on the thin filament. We compare the tropomyosin and troponin of Lethocerus and Drosophila with that of vertebrates. The characteristics of the flight muscle regulatory proteins suggest ways in which stretch-activation works. There is evidence for bridges between troponin on thin filaments and myosin crossbridges on the thick filaments. Recent X-ray fibre diffraction results suggest that a pull on the bridges activates the thin filament by shifting tropomyosin from a blocking position on actin. The troponin bridges are likely to contain extended sequences of tropomyosin or troponin I (TnI). Flight muscle has two isoforms of TnC with different Ca(2+)-binding properties: F1 TnC is needed for stretch-activation and F2 TnC for isometric contractions. In this review, we describe the structural changes in both isoforms on binding Ca(2+) and TnI, and discuss how the steric model of muscle regulation can apply to insect flight muscle.
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Martin SR, Avella G, Adrover M, de Nicola GF, Bullard B, Pastore A. Binding properties of the calcium-activated F2 isoform of Lethocerus troponin C. Biochemistry 2011; 50:1839-47. [PMID: 21250664 PMCID: PMC3057471 DOI: 10.1021/bi102076s] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
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While in most muscles contraction is triggered by calcium effluxes, insect flight muscles are also activated by mechanical stretch. We are interested in understanding the role that the troponin C protein, usually the calcium sensor, plays in stretch activation. In the flight muscles of Lethocerus, a giant water bug often used as a model system, there are two isoforms of TnC, F1 and F2, present in an approximately 10:1 ratio. F1 TnC is responsible for activating the muscle following a stretch, whereas F2 TnC produces a sustained contraction, the magnitude of which depends on the concentration of Ca2+ in the fiber. We have previously shown that F1 TnC binds only one Ca2+ ion in its C-terminal domain and that interaction with troponin H, the insect ortholog of troponin I, is insensitive to Ca2+. Here, we have studied the effect of Ca2+ and Mg2+ on the affinities of the interaction of F2 TnC with troponin H peptides. We show that the presence of two Ca2+ ions, one in each of the globular domains, increases the affinity for TnH by at least 1 order of magnitude. The N lobe has a lower affinity for Ca2+, but it is also sensitive to Mg2+. The C lobe is insensitive to Mg2+ as previously demonstrated by mutations of the individual EF-hands. The interaction with TnH seems also to have significant structural differences from that observed for the F1 TnC isoform. We discuss how our findings could account for stretch activation.
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Affiliation(s)
- Stephen R Martin
- National Institute for Medical Research, The Ridgeway, London NW71AA, U.K
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Liberelle B, Bartholin L, Boucher C, Murschel F, Jolicoeur M, Durocher Y, Merzouki A, De Crescenzo G. New ELISA approach based on coiled-coil interactions. J Immunol Methods 2010; 362:161-7. [PMID: 20869967 DOI: 10.1016/j.jim.2010.09.027] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2010] [Revised: 09/02/2010] [Accepted: 09/16/2010] [Indexed: 11/24/2022]
Abstract
The de novo designed heterodimeric E/K coiled-coil system has been previously demonstrated to be an excellent capture/dimerization system applicable to various needs in both biotechnology and pharmaceutical fields. Those include controlled protein dimerization, capture, purification and Western-blot detection. We here report the development of a new generation of ELISA test based on coiled-coil interactions for the direct quantitation of coil-tagged epidermal growth factor (EGF). The new approach was evaluated for its specificity, plate storability and reusability as well as for convenience when compared to commercially available systems. Our results show a similar affinity/sensitivity to standard capturing antibody-based ELISA systems and an improved affinity/sensitivity when compared to the commercially available Ni-NTA capture system. The E/K coiled-coil ELISA system was validated with respect to recovery, intra- and inter-assay variations. The practical working range was estimated to be between 5.2 and 34,000 pM. Furthermore, the storability and reusability of the plates was greater than the two aforementioned systems, suggesting that the E/K coiled-coil system is a good alternative to traditional tags such as poly-histidine for the development of ELISA tests aiming at quantitating coil-tagged proteins.
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Affiliation(s)
- Benoît Liberelle
- Department of Chemical Engineering, Bio-P2 Research Unit, Institute of Biomedical Engineering, Groupe de Recherche en Sciences et Technologies Biomédicales, Ecole Polytechnique de Montréal, PO BOX 6079, Station Centre-ville, Montréal (QC) Canada H3C 3A7
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Baryshnikova OK, Robertson IM, Mercier P, Sykes BD. The Dilated Cardiomyopathy G159D Mutation in Cardiac Troponin C Weakens the Anchoring Interaction with Troponin I. Biochemistry 2008; 47:10950-60. [DOI: 10.1021/bi801165c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Olga K. Baryshnikova
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2H7
| | - Ian M. Robertson
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2H7
| | - Pascal Mercier
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2H7
| | - Brian D. Sykes
- Department of Biochemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2H7
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Demolliens A, Boucher C, Durocher Y, Jolicoeur M, Buschmann MD, De Crescenzo G. Tyrosinase-Catalyzed Synthesis of a Universal Coil-Chitosan Bioconjugate for Protein Immobilization. Bioconjug Chem 2008; 19:1849-54. [DOI: 10.1021/bc800066b] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Antoine Demolliens
- Department of Chemical Engineering, Institute of Biomedical Engineering, Ecole Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, Québec, Canada H3C 3A7, and Animal Cell Technology Group, Bioprocess Sector, Biotechnology Research Institute, National Research Council Canada. 6100 Royalmount Avenue, Montréal, Quebec, Canada H4P 2R2
| | - Cyril Boucher
- Department of Chemical Engineering, Institute of Biomedical Engineering, Ecole Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, Québec, Canada H3C 3A7, and Animal Cell Technology Group, Bioprocess Sector, Biotechnology Research Institute, National Research Council Canada. 6100 Royalmount Avenue, Montréal, Quebec, Canada H4P 2R2
| | - Yves Durocher
- Department of Chemical Engineering, Institute of Biomedical Engineering, Ecole Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, Québec, Canada H3C 3A7, and Animal Cell Technology Group, Bioprocess Sector, Biotechnology Research Institute, National Research Council Canada. 6100 Royalmount Avenue, Montréal, Quebec, Canada H4P 2R2
| | - Mario Jolicoeur
- Department of Chemical Engineering, Institute of Biomedical Engineering, Ecole Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, Québec, Canada H3C 3A7, and Animal Cell Technology Group, Bioprocess Sector, Biotechnology Research Institute, National Research Council Canada. 6100 Royalmount Avenue, Montréal, Quebec, Canada H4P 2R2
| | - Michael D. Buschmann
- Department of Chemical Engineering, Institute of Biomedical Engineering, Ecole Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, Québec, Canada H3C 3A7, and Animal Cell Technology Group, Bioprocess Sector, Biotechnology Research Institute, National Research Council Canada. 6100 Royalmount Avenue, Montréal, Quebec, Canada H4P 2R2
| | - Gregory De Crescenzo
- Department of Chemical Engineering, Institute of Biomedical Engineering, Ecole Polytechnique de Montréal, P.O. Box 6079, Station Centre-ville, Montréal, Québec, Canada H3C 3A7, and Animal Cell Technology Group, Bioprocess Sector, Biotechnology Research Institute, National Research Council Canada. 6100 Royalmount Avenue, Montréal, Quebec, Canada H4P 2R2
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De Nicola G, Burkart C, Qiu F, Agianian B, Labeit S, Martin S, Bullard B, Pastore A. The Structure of Lethocerus Troponin C: Insights into the Mechanism of Stretch Activation in Muscles. Structure 2007; 15:813-24. [PMID: 17637342 DOI: 10.1016/j.str.2007.05.007] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2007] [Revised: 05/07/2007] [Accepted: 05/07/2007] [Indexed: 10/23/2022]
Abstract
To gain a molecular description of how muscles can be activated by mechanical stretch, we have solved the structure of the calcium-loaded F1 isoform of troponin C (TnC) from Lethocerus and characterized its interactions with troponin I (TnI). We show that the presence of only one calcium cation in the fourth EF hand motif is sufficient to induce an open conformation in the C-terminal lobe of F1 TnC, in contrast with what is observed in vertebrate muscle. This lobe interacts in a calcium-independent way both with the N terminus of TnI and, with lower affinity, with a region of TnI equivalent to the switch and inhibitory peptides of vertebrate muscles. Using both synthetic peptides and recombinant proteins, we show that the N lobe of F1 TnC is not engaged in interactions with TnI, excluding a regulatory role of this domain. These findings provide insights into mechanically stimulated muscle contraction.
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Affiliation(s)
- Gianfelice De Nicola
- Molecular Structure Division, National Institute for Medical Research, The Ridgeway, Mill Hill, London NW7 1AA, United Kingdom
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Abstract
In the year 2003 there was a 17% increase in the number of publications citing work performed using optical biosensor technology compared with the previous year. We collated the 962 total papers for 2003, identified the geographical regions where the work was performed, highlighted the instrument types on which it was carried out, and segregated the papers by biological system. In this overview, we spotlight 13 papers that should be on everyone's 'must read' list for 2003 and provide examples of how to identify and interpret high-quality biosensor data. Although we still find that the literature is replete with poorly performed experiments, over-interpreted results and a general lack of understanding of data analysis, we are optimistic that these shortcomings will be addressed as biosensor technology continues to mature.
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Affiliation(s)
- Rebecca L Rich
- Center for Biomolecular Interaction Analysis, University of Utah, Salt Lake City, UT 84132, USA
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Cachia PJ, Kao DJ, Hodges RS. Synthetic peptide vaccine development: measurement of polyclonal antibody affinity and cross-reactivity using a new peptide capture and release system for surface plasmon resonance spectroscopy. J Mol Recognit 2004; 17:540-57. [PMID: 15386623 DOI: 10.1002/jmr.682] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A method has been developed for measurement of antibody affinity and cross-reactivity by surface plasmon resonance spectroscopy using the EK-coil heterodimeric coiled-coil peptide capture system. This system allows for reversible capture of synthetic peptide ligands on a biosensor chip surface, with the advantage that multiple antibody-antigen interactions can be analyzed using a single biosensor chip. This method has proven useful in the development of a synthetic peptide anti-Pseudomonas aeruginosa (PA) vaccine. Synthetic peptide ligands corresponding to the receptor binding domains of pilin from four strains of PA were conjugated to the E-coil strand of the heterodimeric coiled-coil domain and individually captured on the biosensor chip through dimerization with the immobilized K-coil strand. Polyclonal rabbit IgG raised against pilin epitopes was injected over the sensor chip surface for kinetic analysis of the antigen-antibody interaction. The kinetic rate constants, k(on) and k(off), and equilibrium association and dissociation constants, KA and KD, were calculated. Antibody affinities ranged from 1.14 x 10(-9) to 1.60 x 10(-5) M. The results suggest that the carrier protein and adjuvant used during immunization make a dramatic difference in antibody affinity and cross-reactivity. Antibodies raised against the PA strain K pilin epitope conjugated to keyhole limpet haemocyanin using Freund's adjuvant system were more broadly cross-reactive than antibodies raised against the same epitope conjugated to tetanus toxoid using Adjuvax adjuvant. The method described here is useful for detailed characterization of the interaction of polyclonal antibodies with a panel of synthetic peptide ligands with the objective of obtaining high affinity and cross-reactive antibodies in vaccine development.
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Affiliation(s)
- Paul J Cachia
- Department of Biochemistry and Molecular Genetics, University of Colorado Health Sciences Center, Denver, CO, 80262, USA
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