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Haas TM, Mundinger S, Qiu D, Jork N, Ritter K, Dürr‐Mayer T, Ripp A, Saiardi A, Schaaf G, Jessen HJ. Stable Isotope Phosphate Labelling of Diverse Metabolites is Enabled by a Family of 18O-Phosphoramidites. ANGEWANDTE CHEMIE (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2022; 134:e202112457. [PMID: 38505299 PMCID: PMC10947094 DOI: 10.1002/ange.202112457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Indexed: 11/09/2022]
Abstract
Stable isotope labelling is state-of-the-art in quantitative mass spectrometry, yet often accessing the required standards is cumbersome and very expensive. Here, a unifying synthetic concept for 18O-labelled phosphates is presented, based on a family of modified 18O2-phosphoramidite reagents. This toolbox offers access to major classes of biologically highly relevant phosphorylated metabolites as their isotopologues including nucleotides, inositol phosphates, -pyrophosphates, and inorganic polyphosphates. 18O-enrichment ratios >95 % and good yields are obtained consistently in gram-scale reactions, while enabling late-stage labelling. We demonstrate the utility of the 18O-labelled inositol phosphates and pyrophosphates by assignment of these metabolites from different biological matrices. We demonstrate that phosphate neutral loss is negligible in an analytical setup employing capillary electrophoresis electrospray ionisation triple quadrupole mass spectrometry.
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Affiliation(s)
- Thomas M. Haas
- Institute of Organic ChemistryAlbert-Ludwigs-Universität FreiburgAlbertstrasse 2179102Freiburg im BreisgauGermany
| | - Stephan Mundinger
- Institute of Organic ChemistryAlbert-Ludwigs-Universität FreiburgAlbertstrasse 2179102Freiburg im BreisgauGermany
| | - Danye Qiu
- Institute of Organic ChemistryAlbert-Ludwigs-Universität FreiburgAlbertstrasse 2179102Freiburg im BreisgauGermany
| | - Nikolaus Jork
- Institute of Organic ChemistryAlbert-Ludwigs-Universität FreiburgAlbertstrasse 2179102Freiburg im BreisgauGermany
- CIBSS—The Center for Biological Signaling Studies &, Spemann Graduate School of Biology and Medicine (SGBM)Albert-Ludwigs-Universität FreiburgGermany
| | - Kevin Ritter
- Institute of Organic ChemistryAlbert-Ludwigs-Universität FreiburgAlbertstrasse 2179102Freiburg im BreisgauGermany
| | - Tobias Dürr‐Mayer
- Institute of Organic ChemistryAlbert-Ludwigs-Universität FreiburgAlbertstrasse 2179102Freiburg im BreisgauGermany
| | - Alexander Ripp
- Institute of Organic ChemistryAlbert-Ludwigs-Universität FreiburgAlbertstrasse 2179102Freiburg im BreisgauGermany
| | - Adolfo Saiardi
- Medical Research Council, Laboratory for molecular Cell BiologyUniversity College LondonUK
| | - Gabriel Schaaf
- INRES—Institut für Nutzpflanzenwissenschaften und RessourcenschutzUniversität BonnKarlrobert-Kreiten-Strasse 1353115BonnGermany
| | - Henning J. Jessen
- Institute of Organic ChemistryAlbert-Ludwigs-Universität FreiburgAlbertstrasse 2179102Freiburg im BreisgauGermany
- CIBSS—The Center for Biological Signaling Studies &, Spemann Graduate School of Biology and Medicine (SGBM)Albert-Ludwigs-Universität FreiburgGermany
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Haas TM, Mundinger S, Qiu D, Jork N, Ritter K, Dürr-Mayer T, Ripp A, Saiardi A, Schaaf G, Jessen HJ. Stable Isotope Phosphate Labelling of Diverse Metabolites is Enabled by a Family of 18 O-Phosphoramidites*. Angew Chem Int Ed Engl 2021; 61:e202112457. [PMID: 34734451 PMCID: PMC9298905 DOI: 10.1002/anie.202112457] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Indexed: 11/12/2022]
Abstract
Stable isotope labelling is state‐of‐the‐art in quantitative mass spectrometry, yet often accessing the required standards is cumbersome and very expensive. Here, a unifying synthetic concept for 18O‐labelled phosphates is presented, based on a family of modified 18O2‐phosphoramidite reagents. This toolbox offers access to major classes of biologically highly relevant phosphorylated metabolites as their isotopologues including nucleotides, inositol phosphates, ‐pyrophosphates, and inorganic polyphosphates. 18O‐enrichment ratios >95 % and good yields are obtained consistently in gram‐scale reactions, while enabling late‐stage labelling. We demonstrate the utility of the 18O‐labelled inositol phosphates and pyrophosphates by assignment of these metabolites from different biological matrices. We demonstrate that phosphate neutral loss is negligible in an analytical setup employing capillary electrophoresis electrospray ionisation triple quadrupole mass spectrometry.
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Affiliation(s)
- Thomas M Haas
- Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79102, Freiburg im Breisgau, Germany
| | - Stephan Mundinger
- Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79102, Freiburg im Breisgau, Germany
| | - Danye Qiu
- Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79102, Freiburg im Breisgau, Germany
| | - Nikolaus Jork
- Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79102, Freiburg im Breisgau, Germany.,CIBSS-The Center for Biological Signaling Studies &, Spemann Graduate School of Biology and Medicine (SGBM), Albert-Ludwigs-Universität Freiburg, Germany
| | - Kevin Ritter
- Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79102, Freiburg im Breisgau, Germany
| | - Tobias Dürr-Mayer
- Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79102, Freiburg im Breisgau, Germany
| | - Alexander Ripp
- Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79102, Freiburg im Breisgau, Germany
| | - Adolfo Saiardi
- Medical Research Council, Laboratory for molecular Cell Biology, University College London, UK
| | - Gabriel Schaaf
- INRES-Institut für Nutzpflanzenwissenschaften und Ressourcenschutz, Universität Bonn, Karlrobert-Kreiten-Strasse 13, 53115, Bonn, Germany
| | - Henning J Jessen
- Institute of Organic Chemistry, Albert-Ludwigs-Universität Freiburg, Albertstrasse 21, 79102, Freiburg im Breisgau, Germany.,CIBSS-The Center for Biological Signaling Studies &, Spemann Graduate School of Biology and Medicine (SGBM), Albert-Ludwigs-Universität Freiburg, Germany
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Ma W, Duno-Miranda S, Irving T, Craig R, Padrón R. Relaxed tarantula skeletal muscle has two ATP energy-saving mechanisms. J Gen Physiol 2021; 153:e202012780. [PMID: 33480967 PMCID: PMC7822627 DOI: 10.1085/jgp.202012780] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Accepted: 12/22/2020] [Indexed: 12/15/2022] Open
Abstract
Myosin molecules in the relaxed thick filaments of striated muscle have a helical arrangement in which the heads of each molecule interact with each other, forming the interacting-heads motif (IHM). In relaxed mammalian skeletal muscle, this helical ordering occurs only at temperatures >20°C and is disrupted when temperature is decreased. Recent x-ray diffraction studies of live tarantula skeletal muscle have suggested that the two myosin heads of the IHM (blocked heads [BHs] and free heads [FHs]) have very different roles and dynamics during contraction. Here, we explore temperature-induced changes in the BHs and FHs in relaxed tarantula skeletal muscle. We find a change with decreasing temperature that is similar to that in mammals, while increasing temperature induces a different behavior in the heads. At 22.5°C, the BHs and FHs containing ADP.Pi are fully helically organized, but they become progressively disordered as temperature is lowered or raised. Our interpretation suggests that at low temperature, while the BHs remain ordered the FHs become disordered due to transition of the heads to a straight conformation containing Mg.ATP. Above 27.5°C, the nucleotide remains as ADP.Pi, but while BHs remain ordered, half of the FHs become progressively disordered, released semipermanently at a midway distance to the thin filaments while the remaining FHs are docked as swaying heads. We propose a thermosensing mechanism for tarantula skeletal muscle to explain these changes. Our results suggest that tarantula skeletal muscle thick filaments, in addition to having a superrelaxation-based ATP energy-saving mechanism in the range of 8.5-40°C, also exhibit energy saving at lower temperatures (<22.5°C), similar to the proposed refractory state in mammals.
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Affiliation(s)
- Weikang Ma
- Biophysics Collaborative Access Team, Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL
| | - Sebastian Duno-Miranda
- Department of Molecular Physiology and Biophysics, Cardiovascular Research Institute, University of Vermont, Burlington, VT
| | - Thomas Irving
- Biophysics Collaborative Access Team, Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL
| | - Roger Craig
- Division of Cell Biology and Imaging, Department of Radiology, University of Massachusetts Medical School, Worcester, MA
| | - Raúl Padrón
- Division of Cell Biology and Imaging, Department of Radiology, University of Massachusetts Medical School, Worcester, MA
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Padrón R, Ma W, Duno-Miranda S, Koubassova N, Lee KH, Pinto A, Alamo L, Bolaños P, Tsaturyan A, Irving T, Craig R. The myosin interacting-heads motif present in live tarantula muscle explains tetanic and posttetanic phosphorylation mechanisms. Proc Natl Acad Sci U S A 2020; 117:11865-11874. [PMID: 32444484 PMCID: PMC7275770 DOI: 10.1073/pnas.1921312117] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Striated muscle contraction involves sliding of actin thin filaments along myosin thick filaments, controlled by calcium through thin filament activation. In relaxed muscle, the two heads of myosin interact with each other on the filament surface to form the interacting-heads motif (IHM). A key question is how both heads are released from the surface to approach actin and produce force. We used time-resolved synchrotron X-ray diffraction to study tarantula muscle before and after tetani. The patterns showed that the IHM is present in live relaxed muscle. Tetanic contraction produced only a very small backbone elongation, implying that mechanosensing-proposed in vertebrate muscle-is not of primary importance in tarantula. Rather, thick filament activation results from increases in myosin phosphorylation that release a fraction of heads to produce force, with the remainder staying in the ordered IHM configuration. After the tetanus, the released heads slowly recover toward the resting, helically ordered state. During this time the released heads remain close to actin and can quickly rebind, enhancing the force produced by posttetanic twitches, structurally explaining posttetanic potentiation. Taken together, these results suggest that, in addition to stretch activation in insects, two other mechanisms for thick filament activation have evolved to disrupt the interactions that establish the relaxed helices of IHMs: one in invertebrates, by either regulatory light-chain phosphorylation (as in arthropods) or Ca2+-binding (in mollusks, lacking phosphorylation), and another in vertebrates, by mechanosensing.
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Affiliation(s)
- Raúl Padrón
- Division of Cell Biology and Imaging, Department of Radiology, University of Massachusetts Medical School, Worcester, MA 01655;
| | - Weikang Ma
- Biophysics Collaborative Access Team, Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL 60616
| | - Sebastian Duno-Miranda
- Centro de Biología Estructural, Instituto Venezolano de Investigaciones Científicas, Caracas 1020A, Venezuela
| | | | - Kyoung Hwan Lee
- Division of Cell Biology and Imaging, Department of Radiology, University of Massachusetts Medical School, Worcester, MA 01655
| | - Antonio Pinto
- Centro de Biología Estructural, Instituto Venezolano de Investigaciones Científicas, Caracas 1020A, Venezuela
| | - Lorenzo Alamo
- Centro de Biología Estructural, Instituto Venezolano de Investigaciones Científicas, Caracas 1020A, Venezuela
| | - Pura Bolaños
- Centro de Biofísica y Bioquímica, Instituto Venezolano de Investigaciones Científicas, Caracas 1020A, Venezuela
| | - Andrey Tsaturyan
- Institute of Mechanics, Moscow State University, 119992 Moscow, Russia
| | - Thomas Irving
- Biophysics Collaborative Access Team, Department of Biological Sciences, Illinois Institute of Technology, Chicago, IL 60616
| | - Roger Craig
- Division of Cell Biology and Imaging, Department of Radiology, University of Massachusetts Medical School, Worcester, MA 01655
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