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Palafox MA, Kattan D, de Pedraza Velasco ML, Isasi J, Rani K, Singh SP, Vats JK, Rastogi VK. Base pairs with 5-chloroorotic acid and comparison with the natural nucleobase. Structural and spectroscopic study, and three suggested antiviral modified nucleosides. J Biomol Struct Dyn 2024; 42:4956-4984. [PMID: 37403335 DOI: 10.1080/07391102.2023.2226738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 06/05/2023] [Indexed: 07/06/2023]
Abstract
A structural and spectroscopic study of 5-chloroorotic acid (5-ClOA) biomolecule was carried out by IR and FT-Raman and the results obtained were compared to those achieved in 5-fluoroorotic acid and 5-aminoorotic acid compounds. The structures of all possible tautomeric forms were determined using DFT and MP2 methods. To know the tautomer form present in the solid state, the crystal unit cell was optimized through dimer and tetramer forms in several tautomeric forms. The keto form was confirmed through an accurate assignment of all the bands. For this purpose, an additional improvement in the theoretical spectra was carried out using linear scaling equations (LSE) and polynomic equations (PSE) deduced from uracil molecule. Base pairs with uracil, thymine and cytosine nucleobases were optimized and compared to the natural Watson-Crick (WC) pairs. The counterpoise (CP) corrected interaction energies of the base pairs were also calculated. Three nucleosides were optimized based on 5-ClOA as nucleobase, and their corresponding WC pairs with adenosine. These modified nucleosides were inserted in DNA:DNA and RNA:RNA microhelices, which were optimized. The position of the -COOH group in the uracil ring of these microhelices interrupts the DNA/RNA helix formation. Because of the special characteristic of these molecules they can be used as antiviral drugs.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- M Alcolea Palafox
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad Complutense, Madrid, Spain
| | - D Kattan
- Departamento de Química Física, Facultad de Ciencias Químicas, Universidad Complutense, Madrid, Spain
| | - M L de Pedraza Velasco
- Dpto. de Enfermería, Facultad de Enfermería, Fisioterapia y Podología, Universidad Complutense, Madrid, Spain
| | - J Isasi
- Dpto. de Química Inorgánica, Facultad de Ciencias Químicas, Universidad Complutense, Madrid, Spain
| | - Kaushal Rani
- Indian Spectroscopy Society, Ghaziabad, India
- Department of Physics, Meerut College, Meerut, India
| | - S P Singh
- Department of Physics, Dr B R Ambedkar Govt Degree College, Mainpuri, India
| | - J K Vats
- P G Department of Physics, Jai Prakash University, Chapra, India
| | - V K Rastogi
- Department of Physics, Meerut College, Meerut, India
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Del Caño-Ochoa F, Grande-García A, Reverte-López M, D'Abramo M, Ramón-Maiques S. Characterization of the catalytic flexible loop in the dihydroorotase domain of the human multi-enzymatic protein CAD. J Biol Chem 2018; 293:18903-18913. [PMID: 30315107 DOI: 10.1074/jbc.ra118.005494] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 10/08/2018] [Indexed: 11/06/2022] Open
Abstract
The dihydroorotase (DHOase) domain of the multifunctional protein carbamoyl-phosphate synthetase 2, aspartate transcarbamoylase, and dihydroorotase (CAD) catalyzes the third step in the de novo biosynthesis of pyrimidine nucleotides in animals. The crystal structure of the DHOase domain of human CAD (huDHOase) revealed that, despite evolutionary divergence, its active site components are highly conserved with those in bacterial DHOases, encoded as monofunctional enzymes. An important element for catalysis, conserved from Escherichia coli to humans, is a flexible loop that closes as a lid over the active site. Here, we combined mutagenic, structural, biochemical, and molecular dynamics analyses to characterize the function of the flexible loop in the activity of CAD's DHOase domain. A huDHOase chimera bearing the E. coli DHOase flexible loop was inactive, suggesting the presence of distinctive elements in the flexible loop of huDHOase that cannot be replaced by the bacterial sequence. We pinpointed Phe-1563, a residue absolutely conserved at the tip of the flexible loop in CAD's DHOase domain, as a critical element for the conformational equilibrium between the two catalytic states of the protein. Substitutions of Phe-1563 with Ala, Leu, or Thr prevented the closure of the flexible loop and inactivated the protein, whereas substitution with Tyr enhanced the interactions of the loop in the closed position and reduced fluctuations and the reaction rate. Our results confirm the importance of the flexible loop in CAD's DHOase domain and explain the key role of Phe-1563 in configuring the active site and in promoting substrate strain and catalysis.
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Affiliation(s)
- Francisco Del Caño-Ochoa
- From the Department of Genome Dynamics and Function, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Madrid 28049, Spain
| | - Araceli Grande-García
- the Structural Biology Programme, Spanish National Cancer Research Centre (CNIO), Madrid 28029, Spain, and
| | - María Reverte-López
- From the Department of Genome Dynamics and Function, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Madrid 28049, Spain
| | - Marco D'Abramo
- the Department of Chemistry, Sapienza University of Rome, Rome 00185, Italy
| | - Santiago Ramón-Maiques
- From the Department of Genome Dynamics and Function, Centro de Biología Molecular Severo Ochoa (CSIC-UAM), Madrid 28049, Spain,
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Jirkovský E, Jirkovská A, Bureš J, Chládek J, Lenčová O, Stariat J, Pokorná Z, Karabanovich G, Roh J, Brázdová P, Šimůnek T, Kovaříková P, Štěrba M. Pharmacokinetics of the Cardioprotective Drug Dexrazoxane and Its Active Metabolite ADR-925 with Focus on Cardiomyocytes and the Heart. J Pharmacol Exp Ther 2017; 364:433-446. [PMID: 29273587 DOI: 10.1124/jpet.117.244848] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Accepted: 12/19/2017] [Indexed: 11/22/2022] Open
Abstract
Dexrazoxane (DEX), the only cardioprotectant approved against anthracycline cardiotoxicity, has been traditionally deemed to be a prodrug of the iron-chelating metabolite ADR-925. However, pharmacokinetic profile of both agents, particularly with respect to the cells and tissues essential for its action (cardiomyocytes/myocardium), remains poorly understood. The aim of this study is to characterize the conversion and disposition of DEX to ADR-925 in vitro (primary cardiomyocytes) and in vivo (rabbits) under conditions where DEX is clearly cardioprotective against anthracycline cardiotoxicity. Our results show that DEX is hydrolyzed to ADR-925 in cell media independently of the presence of cardiomyocytes or their lysate. Furthermore, ADR-925 directly penetrates into the cells with contribution of active transport, and detectable concentrations occur earlier than after DEX incubation. In rabbits, ADR-925 was detected rapidly in plasma after DEX administration to form sustained concentrations thereafter. ADR-925 was not markedly retained in the myocardium, and its relative exposure was 5.7-fold lower than for DEX. Unlike liver tissue, myocardium homogenates did not accelerate the conversion of DEX to ADR-925 in vitro, suggesting that myocardial concentrations in vivo may originate from its distribution from the central compartment. The pharmacokinetic parameters for both DEX and ADR-925 were determined by both noncompartmental analyses and population pharmacokinetics (including joint parent-metabolite model). Importantly, all determined parameters were closer to human than to rodent data. The present results open venues for the direct assessment of the cardioprotective effects of ADR-925 in vitro and in vivo to establish whether DEX is a drug or prodrug.
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Affiliation(s)
- Eduard Jirkovský
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Anna Jirkovská
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Jan Bureš
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Jaroslav Chládek
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Olga Lenčová
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Ján Stariat
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Zuzana Pokorná
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Galina Karabanovich
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Jaroslav Roh
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Petra Brázdová
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Tomáš Šimůnek
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Petra Kovaříková
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
| | - Martin Štěrba
- Department of Pharmacology, Faculty of Medicine in Hradec Králové (E.J., J.C., O.L., Z.P., P.B., M.Š.), and Departments of Biochemical Sciences (E.J., A.J., T.Š.), Pharmaceutical Chemistry and Pharmaceutical Analysis (J.B., J.S., P.K.), and Inorganic and Organic Chemistry (G.K., J.R.), Faculty of Pharmacy in Hradec Králové, Charles University, Hradec Králové, Czech Republic
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Hasinoff BB, Wu X, Patel D, Kanagasabai R, Karmahapatra S, Yalowich JC. Mechanisms of Action and Reduced Cardiotoxicity of Pixantrone; a Topoisomerase II Targeting Agent with Cellular Selectivity for the Topoisomerase IIα Isoform. J Pharmacol Exp Ther 2015; 356:397-409. [PMID: 26660439 DOI: 10.1124/jpet.115.228650] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Accepted: 12/09/2015] [Indexed: 01/09/2023] Open
Abstract
Pixantrone is a new noncardiotoxic aza-anthracenedione anticancer drug structurally related to anthracyclines and anthracenediones, such as doxorubicin and mitoxantrone. Pixantrone is approved in the European Union for the treatment of relapsed or refractory aggressive B cell non-Hodgkin lymphoma. This study was undertaken to investigate both the mechanism(s) of its anticancer activity and its relative lack of cardiotoxicity. Pixantrone targeted DNA topoisomerase IIα as evidenced by its ability to inhibit kinetoplast DNA decatenation; to produce linear double-strand DNA in a pBR322 DNA cleavage assay; to produce DNA double-strand breaks in a cellular phospho-histone γH2AX assay; to form covalent topoisomerase II-DNA complexes in a cellular immunodetection of complex of enzyme-to-DNA assay; and to display cross-resistance in etoposide-resistant K562 cells. Pixantrone produced semiquinone free radicals in an enzymatic reducing system, although not in a cellular system, most likely due to low cellular uptake. Pixantrone was 10- to 12-fold less damaging to neonatal rat myocytes than doxorubicin or mitoxantrone, as measured by lactate dehydrogenase release. Three factors potentially contribute to the reduced cardiotoxicity of pixantrone. First, its lack of binding to iron(III) makes it unable to induce iron-based oxidative stress. Second, its low cellular uptake may limit its ability to produce semiquinone free radicals and redox cycle. Finally, because the β isoform of topoisomerase II predominates in postmitotic cardiomyocytes, and pixantrone is demonstrated in this study to be selective for topoisomerase IIα in stabilizing enzyme-DNA covalent complexes, the attenuated cardiotoxicity of this agent may also be due to its selectivity for targeting topoisomerase IIα over topoisomerase IIβ.
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Affiliation(s)
- Brian B Hasinoff
- College of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, Manitoba, Canada (B.B.H., X.W., D.P.); and Division of Pharmacology, College of Pharmacy, Ohio State University, Columbus, Ohio (R.K., S.K., J.C.Y.)
| | - Xing Wu
- College of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, Manitoba, Canada (B.B.H., X.W., D.P.); and Division of Pharmacology, College of Pharmacy, Ohio State University, Columbus, Ohio (R.K., S.K., J.C.Y.)
| | - Daywin Patel
- College of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, Manitoba, Canada (B.B.H., X.W., D.P.); and Division of Pharmacology, College of Pharmacy, Ohio State University, Columbus, Ohio (R.K., S.K., J.C.Y.)
| | - Ragu Kanagasabai
- College of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, Manitoba, Canada (B.B.H., X.W., D.P.); and Division of Pharmacology, College of Pharmacy, Ohio State University, Columbus, Ohio (R.K., S.K., J.C.Y.)
| | - Soumendrakrishna Karmahapatra
- College of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, Manitoba, Canada (B.B.H., X.W., D.P.); and Division of Pharmacology, College of Pharmacy, Ohio State University, Columbus, Ohio (R.K., S.K., J.C.Y.)
| | - Jack C Yalowich
- College of Pharmacy, Apotex Centre, University of Manitoba, Winnipeg, Manitoba, Canada (B.B.H., X.W., D.P.); and Division of Pharmacology, College of Pharmacy, Ohio State University, Columbus, Ohio (R.K., S.K., J.C.Y.)
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