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Modrušan M, Glazer L, Otmačić L, Crnolatac I, Cindro N, Vidović N, Piantanida I, Speranza G, Horvat G, Tomišić V. Anion-Binding Properties of Short Linear Homopeptides. Int J Mol Sci 2024; 25:5235. [PMID: 38791275 PMCID: PMC11121566 DOI: 10.3390/ijms25105235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2024] [Revised: 05/05/2024] [Accepted: 05/09/2024] [Indexed: 05/26/2024] Open
Abstract
A comprehensive thermodynamic and structural study of the complexation affinities of tetra (L1), penta (L2), and hexaphenylalanine (L3) linear peptides towards several inorganic anions in acetonitrile (MeCN) and N,N-dimethylformamide (DMF) was carried out. The influence of the chain length on the complexation thermodynamics and structural changes upon anion binding are particularly addressed here. The complexation processes were characterized by means of spectrofluorimetric, 1H NMR, microcalorimetric, and circular dichroism spectroscopy titrations. The results indicate that all three peptides formed complexes of 1:1 stoichiometry with chloride, bromide, hydrogen sulfate, dihydrogen phosphate (DHP), and nitrate anions in acetonitrile and DMF. In the case of hydrogen sulfate and DHP, anion complexes of higher stoichiometries were observed as well, namely those with 1:2 and 2:1 (peptide:anion) complexes. Anion-induced peptide backbone structural changes were studied by molecular dynamic simulations. The anions interacted with backbone amide protons and one of the N-terminal amine protons through hydrogen bonding. Due to the anion binding, the main chain of the studied peptides changed its conformation from elongated to quasi-cyclic in all 1:1 complexes. The accomplishment of such a conformation is especially important for cyclopeptide synthesis in the head-to-tail macrocyclization step, since it is most suitable for ring closure. In addition, the studied peptides can act as versatile ionophores, facilitating transmembrane anion transport.
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Affiliation(s)
- Matija Modrušan
- Department of Chemistry, Faculty of Science, Horvatovac 102a, 10000 Zagreb, Croatia; (M.M.); (L.G.); (L.O.); (N.C.); (V.T.)
| | - Lucija Glazer
- Department of Chemistry, Faculty of Science, Horvatovac 102a, 10000 Zagreb, Croatia; (M.M.); (L.G.); (L.O.); (N.C.); (V.T.)
| | - Lucija Otmačić
- Department of Chemistry, Faculty of Science, Horvatovac 102a, 10000 Zagreb, Croatia; (M.M.); (L.G.); (L.O.); (N.C.); (V.T.)
| | - Ivo Crnolatac
- Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia; (I.C.); (I.P.)
| | - Nikola Cindro
- Department of Chemistry, Faculty of Science, Horvatovac 102a, 10000 Zagreb, Croatia; (M.M.); (L.G.); (L.O.); (N.C.); (V.T.)
| | - Nikolina Vidović
- Faculty of Biotechnology and Drug Development, University of Rijeka, Radmile Matejčić 2, 51000 Rijeka, Croatia;
| | - Ivo Piantanida
- Department of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička Cesta 54, 10000 Zagreb, Croatia; (I.C.); (I.P.)
| | - Giovanna Speranza
- Department of Chemistry, University of Milan, Via Golgi 19, 20122 Milan, Italy;
| | - Gordan Horvat
- Department of Chemistry, Faculty of Science, Horvatovac 102a, 10000 Zagreb, Croatia; (M.M.); (L.G.); (L.O.); (N.C.); (V.T.)
| | - Vladislav Tomišić
- Department of Chemistry, Faculty of Science, Horvatovac 102a, 10000 Zagreb, Croatia; (M.M.); (L.G.); (L.O.); (N.C.); (V.T.)
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Abstract
This review covers the literature published between January and December in 2018 for marine natural products (MNPs), with 717 citations (706 for the period January to December 2018) referring to compounds isolated from marine microorganisms and phytoplankton, green, brown and red algae, sponges, cnidarians, bryozoans, molluscs, tunicates, echinoderms, mangroves and other intertidal plants and microorganisms. The emphasis is on new compounds (1554 in 469 papers for 2018), together with the relevant biological activities, source organisms and country of origin. Reviews, biosynthetic studies, first syntheses, and syntheses that led to the revision of structures or stereochemistries, have been included. The proportion of MNPs assigned absolute configuration over the last decade is also surveyed.
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Affiliation(s)
- Anthony R Carroll
- School of Environment and Science, Griffith University, Gold Coast, Australia. and Griffith Institute for Drug Discovery, Griffith University, Brisbane, Australia
| | - Brent R Copp
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Rohan A Davis
- Griffith Institute for Drug Discovery, Griffith University, Brisbane, Australia and School of Environment and Science, Griffith University, Brisbane, Australia
| | - Robert A Keyzers
- Centre for Biodiscovery, School of Chemical and Physical Sciences, Victoria University of Wellington, Wellington, New Zealand
| | - Michèle R Prinsep
- Chemistry, School of Science, University of Waikato, Hamilton, New Zealand
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