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Jastrzab R, Nowak M, Zabiszak M, Odani A, Kaczmarek MT. Significance and properties of the complex formation of phosphate and polyphosphate groups in particles present in living cells. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2021.213810] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Blindauer CA, Holý A, Operschall BP, Sigel A, Song B, Sigel H. Metal Ion‐Coordinating Properties in Aqueous Solutions of the Antivirally Active Nucleotide Analogue (
S
)‐9‐[3‐Hydroxy‐2‐(phosphonomethoxy)propyl]adenine (HPMPA) – Quantification of Complex Isomeric Equilibria. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900620] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Claudia A. Blindauer
- Department of Chemistry Inorganic Chemistry University of Basel Spitalstrasse 51 4056 Basel Switzerland
- Department of Chemistry Inorganic Chemistry University of Warwick Coventry CV4 7AL UK
| | - Antonín Holý
- Institute of Organic Chemistry and Biochemistry Centre of Novel Antivirals and Antineoplastics Academy of Sciences 16610 Prague Czech Republic
| | - Bert P. Operschall
- Department of Chemistry Inorganic Chemistry University of Basel Spitalstrasse 51 4056 Basel Switzerland
| | - Astrid Sigel
- Department of Chemistry Inorganic Chemistry University of Basel Spitalstrasse 51 4056 Basel Switzerland
| | - Bin Song
- Department of Chemistry Inorganic Chemistry University of Basel Spitalstrasse 51 4056 Basel Switzerland
- Centre of Novel Antivirals and Antineoplastics Vertex Pharmaceuticals Inc. 02210 Boston MA USA
| | - Helmut Sigel
- Department of Chemistry Inorganic Chemistry University of Basel Spitalstrasse 51 4056 Basel Switzerland
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Blindauer CA, Griesser R, Holý A, Operschall BP, Sigel A, Song B, Sigel H. Intramolecular π-stacks in mixed-ligand copper(II) complexes formed by heteroaromatic amines and antivirally active acyclic nucleotide analogs carrying a hydroxy-2-(phosphonomethoxy)propyl residue ‡. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1490019] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Claudia A. Blindauer
- Department of Chemistry, Inorganic Chemistry, University of Basel, Basel, Switzerland
- Department of Chemistry, University of Warwick, Coventry, UK
| | - Rolf Griesser
- Department of Chemistry, Inorganic Chemistry, University of Basel, Basel, Switzerland
| | - Antonín Holý
- Institute of Organic Chemistry and Biochemistry, Centre of Novel Antivirals and Antineoplastics, Academy of Sciences, Prague, Czech Republic
| | - Bert P. Operschall
- Department of Chemistry, Inorganic Chemistry, University of Basel, Basel, Switzerland
| | - Astrid Sigel
- Department of Chemistry, Inorganic Chemistry, University of Basel, Basel, Switzerland
| | - Bin Song
- Department of Chemistry, Inorganic Chemistry, University of Basel, Basel, Switzerland
- Vertex Pharmaceuticals Inc., Boston, MA, USA
| | - Helmut Sigel
- Department of Chemistry, Inorganic Chemistry, University of Basel, Basel, Switzerland
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Blindauer CA, Sigel A, Operschall BP, Griesser R, Holý A, Sigel H. Extent of intramolecular π stacks in aqueous solution in mixed-ligand copper(II) complexes formed by heteroaromatic amines and the anticancer and antivirally active 9-[2-(phosphonomethoxy)ethyl]guanine (PMEG). A comparison with related acyclic nucleotide analogues. Polyhedron 2016. [DOI: 10.1016/j.poly.2015.02.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Blindauer CA, Sigel A, Operschall BP, Holý A, Sigel H. Extent of Intramolecular π Stacks in Aqueous Solution in Mixed-Ligand Copper(II) Complexes Formed by Heteroaromatic Amines and 1-[2-(Phosphonomethoxy)ethyl]cytosine (PMEC), a Relative of Antivirally Active Acyclic Nucleotide Analogues (Part 72) [1, 2]. Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201300095] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Sigel A, Operschall BP, Sigel H. Steric guiding of metal ion binding to a purine residue by a non-coordinating amino group: Examplified by 9-[(2-phosphonomethoxy)ethyl]-2-aminopurine (PME2AP), an isomer of the antiviral nucleotide analogue 9-[(2-phosphonomethoxy)ethyl]adenine (PMEA), and by related compounds. Coord Chem Rev 2012. [DOI: 10.1016/j.ccr.2011.06.030] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Fernández-Botello A, Operschall BP, Holy A, Moreno V, Sigel H. Metal ion-binding properties of 9-[(2-phosphonomethoxy)ethyl]-2-aminopurine (PME2AP), an isomer of the antiviral nucleotide analogue 9-[(2-phosphonomethoxy)ethyl]adenine (PMEA). Steric guiding of metal ion-coordination by the purine-amino group. Dalton Trans 2010; 39:6344-54. [DOI: 10.1039/c005238h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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Fernández-Botello A, Holý A, Moreno V, Operschall BP, Sigel H. Intramolecular π–π stacking interactions in aqueous solution in mixed-ligand copper(II) complexes formed by heteroaromatic amines and the nucleotide analogue 9-[2-(phosphonomethoxy)ethyl]-2-aminopurine (PME2AP), an isomer of the antivirally active 9-[2-(phosphonomethoxy)ethyl]adenine (PMEA). Inorganica Chim Acta 2009. [DOI: 10.1016/j.ica.2008.02.035] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Fernández-Botello A, Escuer A, Solans X, Font-Bardía M, Holý A, Sigel H, Moreno V. New Ternary Complexes of Copper(II) with 2,2′-Bipyridine (Bpy) and Phosphocholine (PCh–) or the Quaternary 1-(2-Phosphonomethoxy)ethyl Derivative of 2,4-Diaminopyrimidine (PMEDAPy–). Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200601002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Knobloch B, Suliga D, Okruszek A, Sigel RKO. Acid-base and metal-ion binding properties of the RNA dinucleotide uridylyl-(5'-->3')-[5']uridylate (pUpU3-). Chemistry 2006; 11:4163-70. [PMID: 15861476 DOI: 10.1002/chem.200500013] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
It is well known that Mg2+ and other divalent metal ions bind to the phosphate groups of nucleic acids. Subtle differences in the coordination properties of these metal ions to RNA, especially to ribozymes, determine whether they either promote or inhibit catalytic activity. The ability of metal ions to coordinate simultaneously with two neighboring phosphate groups is important for ribozyme structure and activity. However, such an interaction has not yet been quantified. Here, we have performed potentiometric pH titrations to determine the acidity constants of the protonated dinucleotide H2(pUpU)-, as well as the binding properties of pUpU3- towards Mg2+, Mn2+, Cd2+, Zn2+, and Pb2+. Whereas Mg2+, Mn2+, and Cd2+ only bind to the more basic 5'-terminal phosphate group, Pb2+, and to a certain extent also Zn2+, show a remarkably enhanced stability of the [M(pUpU)]- complex. This can be attributed to the formation of a macrochelate by bridging the two phosphate groups within this dinucleotide by these metal ions. Such a macrochelate is also possible in an oligonucleotide, because the basic structural units are the same, despite the difference in charge. The formation degrees of the macrochelated species of [Zn(pUpU)]- and [Pb(pUpU)]- amount to around 25 and 90 %, respectively. These findings are important in the context of ribozyme and DNAzyme catalysis, and explain, for example, why the leadzyme could be selected in the first place, and why this artificial ribozyme is inhibited by other divalent metal ions, such as Mg2+.
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Affiliation(s)
- Bernd Knobloch
- Institute of Inorganic Chemistry, University of Zürich, Switzerland
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Fernández-Botello A, Griesser R, Holý A, Moreno V, Sigel H. Acid-base and metal-ion-binding properties of 9-[2-(2-phosphonoethoxy)ethyl]adenine (PEEA), a relative of the antiviral nucleotide analogue 9-[2-(phosphonomethoxy)ethyl]adenine (PMEA). An exercise on the quantification of isomeric complex equilibria in solution. Inorg Chem 2005; 44:5104-17. [PMID: 15998039 DOI: 10.1021/ic050341j] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The acidity constants of 3-fold protonated 9-[2-(2-phosphonoethoxy)ethyl]adenine, H3(PEEA)+, and of 2-fold protonated (2-phosphonoethoxy)ethane, H2(PEE), and the stability constants of the M(H;PEEA)+, M(PEEA), and M(PEE) complexes with M2+ = Mg2+, Ca2+, Sr2+, Ba2+, Mn2+, Co2+, Ni2+, Cu2+, Zn2+, or Cd2+ have been determined (potentiometric pH titrations; aqueous solution; 25 degrees C; I = 0.1 M, NaNO3). It is concluded that in the M(H;PEEA)+ species, the proton is at the phosphonate group and the metal ion at the adenine residue. The application of previously determined straight-line plots of log K(M(R-PO3))M versus pK(H(R-PO3))H for simple phosph(on)ate ligands, R-PO3(2-), where R represents a residue that does not affect metal-ion binding, proves that the M(PEEA) complexes of Co2+, Ni2+, Cu2+, Zn2+, and Cd2+ as well as the M(PEE) complexes of Co2+, Cu2+, and Zn2+ have larger stabilities than is expected for a sole phosphonate coordination of M2+. For the M2+ complexes without an enhanced stability (e.g., Mg2+ or Mn2+), it is concluded that M2+ binds in a monodentate fashion to the phosphonate group of the two ligands. Combination of all of the results allows the following conclusions: (i) The increased stability of the Co(PEE), Cu(PEE), Zn(PEE), and Co(PEEA) complexes is due to the formation of six-membered chelates involving the ether-oxygen atom of the aliphatic residue (-CH2-O-CH2CH2-PO3(2-)) of the ligands with formation degrees of about 15-30%. (ii) Cd(PEEA) forms a macrochelate with N7 of the adenine residue (formation degree about 30%); Ni(PEEA) has similar properties. (iii) With Zn(PEEA), both mentioned types of chelates are observed, that is, Zn(PEEA)(cl/O) and Zn(PEEA)(cl/N7), with formation degrees of about 13 and 41%, respectively; the remaining 46% is due to the "open" isomer Zn(PEEA)(op) in which the metal ion binds only to the PO3(2-) group. (iv) Most remarkable is Cu(PEEA) because a fourth isomer, Cu(PEEA)(cl/O/N3), is formed that contains a six-membered ring involving the ether oxygen next to the phosphonate group and also a seven-membered ring involving N3 of the adenine residue with a very significant formation degree of about 50%. Hence, PEEA(2-) is a truly ambivalent ligand, its properties being strongly dependent on the kind of metal ion involved. Comparisons with M2+ complexes formed by the dianions of 9-[2-(phosphonomethoxy)ethyl]adenine (PMEA) and related ligands reveal that five-membered chelates involving an ether-oxygen atom are considerably more stable than the corresponding six-membered ones. This observation offers an explanation of why PMEA is a nucleotide analogue with excellent antiviral properties and PEEA is not.
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Affiliation(s)
- Alfonso Fernández-Botello
- Department of Chemistry, Inorganic Chemistry, University of Basel, Spitalstrasse 51, CH-4056 Basel, Switzerland
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Bianchi E, Griesser R, Sigel H. Influence of Decreasing Solvent Polarity (1,4-Dioxane/Water Mixtures) on the Acid-Base and Copper(II)-Binding Properties of Guanosine 5?-Diphosphate. Helv Chim Acta 2005. [DOI: 10.1002/hlca.200590026] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Fernández-Botello A, Holý A, Moreno V, Sigel H. Intramolecular stacking interactions in ternary copper(II) complexes formed by a heteroaromatic amine and 9-[2-(2-phosphonoethoxy)ethyl]adenine, a relative of the antiviral nucleotide analogue 9-[2-(phosphonomethoxy)ethyl]adenine☆. J Inorg Biochem 2004; 98:2114-24. [PMID: 15541501 DOI: 10.1016/j.jinorgbio.2004.08.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2004] [Revised: 07/31/2004] [Accepted: 08/03/2004] [Indexed: 11/29/2022]
Abstract
The stability constants of the mixed-ligand complexes formed between Cu(Arm)2+, where Arm=2,2'-bipyridine (Bpy) or 1,10-phenanthroline (Phen), and the dianions of 9-[2-(2-phosphonoethoxy)ethyl]adenine (PEEA2-) and (2-phosphonoethoxy)ethane (PEE2-), also known as [2-(2-ethoxy)ethyl]phosphonate, were determined by potentiometric pH titrations in aqueous solution (25 degrees C; I=0.1 M, NaNO3). The ternary Cu(Arm)(PEEA) complexes are considerably more stable than the corresponding Cu(Arm)(R-PO3) species, where R-PO3(2-) represents a phosph(on)ate ligand with a group R that is unable to participate in any kind of interaction within the complexes. The increased stability is attributed to intramolecular stack formation in the Cu(Arm)(PEEA) complexes and also, to a smaller extent, to the formation of 6-membered chelates involving the ether oxygen atom present in the -CH2-O-CH2-CH2-PO3(2-) residue of PEEA2-. This latter interaction is separately quantified by studying the ternary Cu(Arm)(PEE) complexes which can form the 6-membered chelates but where no intramolecular ligand-ligand stacking is possible. Application of these results allows a quantitative analysis of the intramolecular equilibria involving three structurally different Cu(Arm)(PEEA) species; e.g., of the Cu(Bpy)(PEEA) system about 11% exist with the metal ion solely coordinated to the phosphonate group, 4% as a 6-membered chelate involving the ether oxygen atom of the -CH2-O-CH2CH2-PO3(2-) residue, and 85% with an intramolecular stack between the adenine moiety of PEEA2- and the aromatic rings of Bpy. In addition, the Cu(Arm)(PEEA) complexes may be protonated, leading to Cu(Arm)(H;PEEA)+ species for which it is concluded that the proton is located at the phosphonate group and that the complexes are mainly formed (50 and 70%) by a stacking adduct between Cu(Arm)2+ and the adenine residue of H(PEEA)-. Finally, the stacking properties of adenosine 5'-monophosphate (AMP2-), of the dianion of 9-[2-(phophonomethoxy)ethyl]adenine (PMEA2-) and of several of its analogues (=PA2-) are compared in their ternary Cu(Arm)(AMP) and Cu(Arm)(PA) systems. Conclusions regarding the antiviral properties of several acyclic nucleoside phosphonates are shortly discussed.
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Affiliation(s)
- Alfonso Fernández-Botello
- Department of Chemistry, Inorganic Chemistry, University of Basel, Spitalstrasse 51, CH-4056 Basel, Switzerland
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Sánchez-Moreno MJ, Gómez-Coca RB, Fernández-Botello A, Ochocki J, Kotynski A, Griesser R, Sigel H. Synthesis and acid-base properties of (1H-benzimidazol-2-yl-methyl)phosphonate (Bimp2-). Evidence for intramolecular hydrogen-bond formation in aqueous solution between (N-1)H and the phosphonate group. Org Biomol Chem 2003; 1:1819-26. [PMID: 12926375 DOI: 10.1039/b301281f] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of (1H-benzimidazol-2-yl-methyl)phosphonic acid, H2(Bimp)+/-, is described: 2-chloromethylbenzimidazole was reacted with ethylchloroformate to give 1-carboethoxy-2-chloromethylbenzimidazole which was treated with trimethyl phosphite and after hydrolysis with aqueous HBr H2(Bimp)+/- was obtained. In H2(Bimp)+/- one proton is at the N-3 site and the other at the phosphonate group; both acidity constants were determined in aqueous solution by potentiometric pH titrations (25 degrees C; I = 0.1 M, NaNO3) and this furnished the pKa values of 5.37 +/- 0.02 and 7.41 +/- 0.02, respectively. The acidity constant for the release of the primary proton from the P(O)(OH)2 group of H3(Bimp)+ was estimated: pKa = 1.5 +/- 0.2. Moreover, Bimp2- can be further deprotonated at its neutral (N-1/N-3)H site to give the benzimidazolate residue, but this reaction occurs only in strongly alkaline solution (KOH); application of the H_ scale developed by G. Yagil (J. Phys. Chem., 1967, 71, 1034) together with UV spectrophotometric measurements gave pKa = 14.65 +/- 0.12. Comparisons with acidity constants taken from the literature show that this latter pKa value is far too large and this allows the conclusion that an intramolecular hydrogen bond is formed between the (N-1/N-3)H site and the phosphonate group of Bimp2-; the formation degree of this hydrogen-bonded isomer is estimated to be 98 +/- 2%. The general relevance of this and the other results are shortly discussed and the species distribution for the Bimp system in dependence on pH is provided.
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Affiliation(s)
- María José Sánchez-Moreno
- Department of Inorganic Chemistry, Faculty of Pharmacy, University of Granada, Campus de Cartuja, s/n, E-18071 Granada, Spain
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