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Grossert JS, Crowell AMJ, Boschi D, Lolli ML, White RL. Tandem mass spectrometry of homologous 3-hydroxyfurazan and nitrile amino acids: Analysis of cooperative interactions and fragmentation processes. JOURNAL OF MASS SPECTROMETRY : JMS 2024; 59:e5043. [PMID: 38789127 DOI: 10.1002/jms.5043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Revised: 04/23/2024] [Accepted: 05/06/2024] [Indexed: 05/26/2024]
Abstract
The assignment of structure by tandem mass spectrometry (MS/MS) relies on the interpretation of the fragmentation behavior of gas-phase ions. Mass spectra were acquired for a series of heterocyclic mimetics of acidic amino acids and a related series of nitrile amino acids. All amino acids were readily protonated or deprotonated by electrospray ionization (ESI), and distinctive fragmentation processes were observed when the ions were subjected to collision-induced dissociation (CID). The deprotonated heterocycles showed bond cleavages of the 3-hydroxyfurazan ring with formation of oxoisocyanate and the complementary deprotonated nitrile amino acid. Further fragmentation of the deprotonated nitrile amino acids was greatly dependent on the length of the alkyl nitrile side chain. Competing losses of CO2 versus HCN occurred from α-cyanoglycinate (shortest chain), whereas water was lost from 2-amino-5-cyanopentanoate (longest chain). Interestingly, loss of acrylonitrile by a McLafferty-type fragmentation process was detected for 2-amino-4-cyanobutanoate, and several competing processes were observed for β-cyanoalanate. In one process, cyanide ion was formed either by consecutive losses of ammonia, carbon dioxide, and acetylene or by a one-step decarboxylative elimination. In another, complementary ions were obtained from β-cyanoalanate by loss of acetonitrile or HN=CHCO2H. Fragmentation of the protonated 3-hydroxyfurazan and nitrile amino acids resulted in the cumulative loss (H2O + CO), a loss that is commonly observed for protonated aliphatic α-amino acids. Overall, the distinct fragmentation behavior of the multifunctional 3-hydroxyfurazan amino acids correlated with the charged site, whereas fragmentations of the deprotonated nitrile amino acids showed cooperative interactions between the nitrile and the carboxylate groups.
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Affiliation(s)
- J Stuart Grossert
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Andrew M J Crowell
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Donatella Boschi
- Dipartimento di Scienza e Tecnologia del Farmaco (DSTF), Università degli Studi di Torino, Torino, Italy
| | - Marco L Lolli
- Dipartimento di Scienza e Tecnologia del Farmaco (DSTF), Università degli Studi di Torino, Torino, Italy
| | - Robert L White
- Department of Chemistry, Dalhousie University, Halifax, Nova Scotia, Canada
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Siow A, Tasma Z, Walker CS, Brimble MA, Harris PWR. Synthesis and development of seven-membered constrained cyclic urea based PSMA inhibitors via RCM. NEW J CHEM 2022. [DOI: 10.1039/d2nj01016j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Intramolecular ring-closing metathesis on an N,N-diallyl Glu-urea-Gly substrate affords 7-membered cyclic ureas as inhibitors of prostrate specific membrane antigen (PMSA).
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Affiliation(s)
- Andrew Siow
- School of Chemical Sciences, The University of Auckland, 23 Symonds Street, Auckland 1010, New Zealand
| | - Zoe Tasma
- School of Biological Sciences, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
| | - Christopher S. Walker
- School of Biological Sciences, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
| | - Margaret A. Brimble
- School of Chemical Sciences, The University of Auckland, 23 Symonds Street, Auckland 1010, New Zealand
- School of Biological Sciences, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
| | - Paul. W. R. Harris
- School of Chemical Sciences, The University of Auckland, 23 Symonds Street, Auckland 1010, New Zealand
- School of Biological Sciences, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
- Maurice Wilkins Centre for Molecular Biodiscovery, The University of Auckland, 3A Symonds Street, Auckland 1010, New Zealand
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Sainas S, Temperini P, Farnsworth JC, Yi F, Møllerud S, Jensen AA, Nielsen B, Passoni A, Kastrup JS, Hansen KB, Boschi D, Pickering DS, Clausen RP, Lolli ML. Use of the 4-Hydroxytriazole Moiety as a Bioisosteric Tool in the Development of Ionotropic Glutamate Receptor Ligands. J Med Chem 2019; 62:4467-4482. [PMID: 30943028 DOI: 10.1021/acs.jmedchem.8b01986] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
We report a series of glutamate and aspartate analogues designed using the hydroxy-1,2,3-triazole moiety as a bioisostere for the distal carboxylic acid. Compound 6b showed unprecedented selectivity among ( S)-2-amino-3-(3-hydroxy-5-methyl-4-isoxazolyl)propionic acid (AMPA) receptor subtypes, confirmed also by an unusual binding mode observed for the crystal structures in complex with the AMPA receptor GluA2 agonist-binding domain. Here, a methionine (Met729) was highly disordered compared to previous agonist-bound structures. This observation provides a possible explanation for the pharmacological profile. In the structure with 7a, an unusual organization of water molecules around the bioisostere arises compared to previous structures of ligands with other bioisosteres. Aspartate analogue 8 with the hydroxy-1,2,3-triazole moiety directly attached to glycine was unexpectedly able to activate both the glutamate and glycine agonist-binding sites of the N-methyl-d-aspartic acid receptor. These observations demonstrate novel features that arise when employing a hydroxytriazole moiety as a bioisostere for the distal carboxylic acid in glutamate receptor agonists.
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Affiliation(s)
- Stefano Sainas
- Department of Drug Science and Technology , University of Turin , via P.Giuria 9 , 10125 Turin , Italy
| | - Piero Temperini
- Department of Drug Design and Pharmacology , University of Copenhagen , 2100 Copenhagen , Denmark
| | - Jill C Farnsworth
- Department of Biomedical and Pharmaceutical Sciences, Center for Structural and Functional Neuroscience, and Center for Biomolecular Structure and Dynamics , University of Montana , Missoula , Montana 59812 , United States
| | - Feng Yi
- Department of Biomedical and Pharmaceutical Sciences, Center for Structural and Functional Neuroscience, and Center for Biomolecular Structure and Dynamics , University of Montana , Missoula , Montana 59812 , United States
| | - Stine Møllerud
- Department of Drug Design and Pharmacology , University of Copenhagen , 2100 Copenhagen , Denmark
| | - Anders A Jensen
- Department of Drug Design and Pharmacology , University of Copenhagen , 2100 Copenhagen , Denmark
| | - Birgitte Nielsen
- Department of Drug Design and Pharmacology , University of Copenhagen , 2100 Copenhagen , Denmark
| | - Alice Passoni
- Istituto di Ricerche Farmacologiche "Mario Negri" IRCCS , via La Masa 19 , 20156 Milan , Italy
| | - Jette S Kastrup
- Department of Drug Design and Pharmacology , University of Copenhagen , 2100 Copenhagen , Denmark
| | - Kasper B Hansen
- Department of Biomedical and Pharmaceutical Sciences, Center for Structural and Functional Neuroscience, and Center for Biomolecular Structure and Dynamics , University of Montana , Missoula , Montana 59812 , United States
| | - Donatella Boschi
- Department of Drug Science and Technology , University of Turin , via P.Giuria 9 , 10125 Turin , Italy
| | - Darryl S Pickering
- Department of Drug Design and Pharmacology , University of Copenhagen , 2100 Copenhagen , Denmark
| | - Rasmus P Clausen
- Department of Drug Design and Pharmacology , University of Copenhagen , 2100 Copenhagen , Denmark
| | - Marco L Lolli
- Department of Drug Science and Technology , University of Turin , via P.Giuria 9 , 10125 Turin , Italy
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Møllerud S, Pinto A, Marconi L, Frydenvang K, Thorsen TS, Laulumaa S, Venskutonytė R, Winther S, Moral AMC, Tamborini L, Conti P, Pickering DS, Kastrup JS. Structure and Affinity of Two Bicyclic Glutamate Analogues at AMPA and Kainate Receptors. ACS Chem Neurosci 2017; 8:2056-2064. [PMID: 28691798 DOI: 10.1021/acschemneuro.7b00201] [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] [Indexed: 11/30/2022] Open
Abstract
Ionotropic glutamate receptors (iGluRs) are involved in most of the fast excitatory synaptic transmission in the central nervous system. These receptors are important for learning and memory formation, but are also involved in the development of diseases such as Alzheimer's disease, epilepsy and depression. To understand the function of different types of iGluRs, selective agonists are invaluable as pharmacological tool compounds. Here, we report binding affinities of two bicyclic, conformationally restricted analogues of glutamate (CIP-AS and LM-12b) at AMPA (GluA2 and GluA3) and kainate receptor subunits (GluK1-3 and GluK5). Both CIP-AS and LM-12b were found to be GluK3-preferring agonists, with Ki of 6 and 22 nM, respectively, at recombinant GluK3 receptors. The detailed binding mode of CIP-AS and LM-12b in the ligand-binding domains of the AMPA receptor subunit GluA2 (GluA2-LBD) and the kainate receptor subunits GluK1 (GluK1-LBD) and GluK3 (GluK3-LBD) was investigated by X-ray crystallography. CIP-AS stabilized all three receptor constructs in conformations similar to those with kainate. Remarkably, whereas LM-12b bound in a similar manner to CIP-AS in GluA2-LBD and GluK3-LBD, it introduced full closure of the ligand-binding domain in GluK1-LBD and formation of a D1-D2 interlobe hydrogen bond between Glu441 and Ser721, as also observed with glutamate. As the binding affinity of LM-12b at GluK1 is ∼8-fold better than that for CIP-AS (Ki of 85 and 656 nM, respectively), it shows that small changes in agonist structure can lead to prominent differences in structure and function.
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Affiliation(s)
- Stine Møllerud
- Department of Drug
Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Andrea Pinto
- Department of Food, Environmental and Nutritional Sciences, Università degli Studi di Milano, 20133 Milano, Italy
| | - Laura Marconi
- Department of Drug
Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
- Department of Pharmaceutical Sciences, Università degli Studi di Milano, 20133 Milano, Italy
| | - Karla Frydenvang
- Department of Drug
Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Thor Seneca Thorsen
- Department of Drug
Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Saara Laulumaa
- Department of Drug
Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Raminta Venskutonytė
- Department of Drug
Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Sebastian Winther
- Department of Drug
Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Ana Maria Cuñado Moral
- Department of Drug
Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Lucia Tamborini
- Department of Pharmaceutical Sciences, Università degli Studi di Milano, 20133 Milano, Italy
| | - Paola Conti
- Department of Pharmaceutical Sciences, Università degli Studi di Milano, 20133 Milano, Italy
| | - Darryl S. Pickering
- Department of Drug
Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
| | - Jette Sandholm Kastrup
- Department of Drug
Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, 2100 Copenhagen, Denmark
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