1
|
Balzarini J, Van Daele I, Negri A, Solaroli N, Karlsson A, Liekens S, Gago F, Van Calenbergh S. Human Mitochondrial Thymidine Kinase Is Selectively Inhibited by 3′-Thiourea Derivatives of β-Thymidine: Identification of Residues Crucial for Both Inhibition and Catalytic Activity. Mol Pharmacol 2009; 75:1127-36. [DOI: 10.1124/mol.108.053785] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
|
2
|
Pérez-Pérez MJ, Priego EM, Hernández AI, Familiar O, Camarasa MJ, Negri A, Gago F, Balzarini J. Structure, physiological role, and specific inhibitors of human thymidine kinase 2 (TK2): present and future. Med Res Rev 2008; 28:797-820. [PMID: 18459168 PMCID: PMC7168489 DOI: 10.1002/med.20124] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
Human mitochondrial thymidine kinase (TK2) is a pyrimidine deoxynucleoside kinase (dNK) that catalyzes the phosphorylation of pyrimidine deoxynucleosides to their corresponding deoxynucleoside 5′‐monophosphates by γ‐phosphoryl transfer from ATP. In resting cells, TK2 is suggested to play a key role in the mitochondrial salvage pathway to provide pyrimidine nucleotides for mitochondrial DNA (mtDNA) synthesis and maintenance. However, recently the physiological role of TK2turned out to have direct clinical relevance as well. Point mutations in the gene encoding TK2 have been correlated to mtDNA disorders in a heterogeneous group of patients suffering from the so‐called mtDNA depletion syndrome (MDS). TK2 activity could also be involved in mitochondrial toxicity associated to prolonged treatment with antiviral nucleoside analogues like AZT and FIAU. Therefore, TK2 inhibitors can be considered as valuable tools to unravel the role of TK2 in the maintenance and homeostasis of mitochondrial nucleotide pools and mtDNA, and to clarify the contribution of TK2 activity to mitochondrial toxicity of certain antivirals. Highly selective TK‐2 inhibitors having an acyclic nucleoside structure and efficiently discriminating between TK‐2 and the closely related TK‐1 have already been reported. It is actually unclear whether these agents efficiently reach the inner mitochondrial compartment. In the present review article,structural features of TK2, MDS‐related mutations observed in TK2 and their role in MDS will be discussed. Also, an update on novel and selective TK2 inhibitors will be provided. © 2008 Wiley Periodicals, Inc. Med Res Rev, 28, No. 5, 797–820, 2008
Collapse
|
3
|
Ciliberti N, Manfredini S, Angusti A, Durini E, Solaroli N, Vertuani S, Buzzoni L, Bonache MC, Ben-Shalom E, Karlsson A, Saada A, Balzarini J. Novel selective human mitochondrial kinase inhibitors: Design, synthesis and enzymatic activity. Bioorg Med Chem 2007; 15:3065-81. [PMID: 17324575 DOI: 10.1016/j.bmc.2007.01.049] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2006] [Accepted: 01/31/2007] [Indexed: 11/22/2022]
Abstract
Selective and effective TK2 inhibitors can be obtained by introduction of bulky lipophilic chains (acyl or alkyl entities) at the 2' position of araT and BVaraU, nucleoside analogues naturally endowed with a low TK2 affinity. These derivatives showed a competitive inhibitory activity against TK2 in micromolar range. BVaraU nucleoside analogues, modified on the 2'-O-acyl chain with a terminal N-Boc amino-group, conserved or increased the inhibitory activity against TK2 (7l and 7m IC(50): 6.4 and 3.8 microM, respectively). The substitution of an ester for a carboxamide moiety at the 2' position of araT afforded a consistent reduction of the inhibitory activity (25, IC(50): 480 microM). On the contrary, modifications at 2'-OH position of araC and araG, have provided inactive derivatives against TK2 and dGK, respectively. The biological activity of a representative compound, 2'-O-decanoyl-BVaraU, was also investigated in normal human fibroblasts and was found to impair mitochondrial function due to TK2 inhibition.
Collapse
Affiliation(s)
- Nunzia Ciliberti
- Department of Pharmaceutical Sciences, University of Ferrara, Italy
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Priego EM, Balzarini J, Karlsson A, Camarasa MJ, Pérez-Pérez MJ. Synthesis and evaluation of thymine-derived carboxamides against mitochondrial thymidine kinase (TK-2) and related enzymes. Bioorg Med Chem 2005; 12:5079-90. [PMID: 15351391 DOI: 10.1016/j.bmc.2004.07.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2004] [Accepted: 07/16/2004] [Indexed: 11/21/2022]
Abstract
Based on the structure of our previously identified mitochondrial thymidine kinase (TK-2) inhibitors, three series of thymine-derived carboxamides have been synthesized and tested against TK-2 and related enzymes. The methodology employed has been a solution-phase parallel synthesis based on the coupling of three thymine-derived acids [4-(thymin-1-yl)butyric acid (I), [4-(thymin-1-yl)-butyrylamino]acetic acid (II) and 6-(thymin-1-yl)hexanoic acid (III)] with different commercially available primary amines that carry cyano and/or phenyl groups. The couplings were performed in good yields (from 60% to 90%), with the exception of those that incorporate the highly crowded triphenylmethylamine (e). From the new synthesized compounds, the N-trityl-6-(thymin-1-yl)hexanamide (IIIe) was the most active TK-2 inhibitor (IC(50)=19+/-2microM).
Collapse
Affiliation(s)
- Eva-María Priego
- Instituto de Química Médica (CSIC), Juan de la Cierva 3, E-28006 Madrid, Spain
| | | | | | | | | |
Collapse
|
5
|
Van Rompay AR, Johansson M, Karlsson A. Substrate specificity and phosphorylation of antiviral and anticancer nucleoside analogues by human deoxyribonucleoside kinases and ribonucleoside kinases. Pharmacol Ther 2003; 100:119-39. [PMID: 14609716 PMCID: PMC7126524 DOI: 10.1016/j.pharmthera.2003.07.001] [Citation(s) in RCA: 112] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Structural analogues of nucleosides, nucleoside analogues (NA), are used in the treatment of cancer and viral infections. Antiviral NAs inhibit replication of the viral genome, whereas anticancer NAs inhibit cellular DNA replication and repair. NAs are inactive prodrugs that are dependent on intracellular phosphorylation to their pharmacologically active triphosphate form. The deoxyribonucleoside kinases (dNK) and ribonucleoside kinases (rNK) catalyze the first phosphorylation step, converting deoxyribonucleosides and ribonucleosides to their corresponding monophosphate form. The dNKs have been studied intensively, whereas the rNKs have not been as thoroughly investigated. This overview is focused on the substrate specificity, tissue distribution, and subcellular location of the mammalian dNKs and rNKs and their role in the activation of NAs.
Collapse
Key Words
- antiviral therapy
- anticancer therapy
- chemotherapy
- nucleoside analogue
- deoxyribonucleoside kinase
- ribonucleoside kinase
- adk, adenosine kinase
- aids, aquired immunodeficiency syndrome
- arac, 1-β-d-arabinofuranosylcytosine (cytarabine)
- arag, 9-β-d-arabinofuranosylguanine (nelarabine)
- azt, 3′-azido-2′,3′-dideoxythymidine (zidovudine)
- cafda, 2-chloro-2′-fluoro-9-β-d-arabinofuranosyladenine (clofarabine)
- cda, 2-chloro-2′-deoxyadenosine (cladribine)
- dck, deoxycytidine kinase
- ddc, 2′,3′-dideoxycytidine (zalcitabine)
- ddi, 2′,3′-dideoxyinosine (didanosine)
- dgk, deoxyguanosine kinase
- dfdc, 2′,2′-difluorodeoxycytidine (gemcitabine)
- dnk, deoxyribonucleoside kinase
- d4t, 2′,3′-didehydro-3′-deoxythymidine (stavudine)
- f-araa, 2-fluoro-9-β-d-arabinofuranosyladenine (fludarabine)
- fda, food and drug administration
- fiau, 1-(2′-deoxy-2′-fluoro-β-d-arabinofuranosyl)-5-iodouracil (fialuridine)
- hbv, hepatitis b virus
- mtdna, mitochondrial dna
- hiv, human immunodeficiency virus
- na, nucleoside analogue
- ndpk, nucleoside diphosphate kinase
- nmpk, nucleoside monophosphate kinase
- 5′-nt, 5′-nucleotidase
- rnk, ribonucleoside kinase
- rr, ribonucleotide reductase
- rt, reverse transcriptase
- tk1, thymidine kinase 1
- tk2, thymidine kinase 2
- uck1, uridine-cytidine kinase 1
- uck2, uridine-cytidine kinase 2
- 3tc, 2′-deoxy-3′-thiacytidine (lamivudine)
Collapse
Affiliation(s)
- An R Van Rompay
- Department of Nephrology-Hypertension, University of Antwerp, 2610 Antwerp, Belgium
| | | | | |
Collapse
|
6
|
Hernández AI, Balzarini J, Rodríguez-Barrios F, San-Félix A, Karlsson A, Gago F, Camarasa MJ, Pérez-Pérez MJ. Improving the selectivity of acyclic nucleoside analogues as inhibitors of human mitochondrial thymidine kinase: replacement of a triphenylmethoxy moiety with substituted amines and carboxamides. Bioorg Med Chem Lett 2003; 13:3027-30. [PMID: 12941326 DOI: 10.1016/s0960-894x(03)00639-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Two series of analogues of the novel human mitochondrial thymidine kinase inhibitor 1-[(Z)-4-(triphenylmethoxy)-2-butenyl]thymine were synthesized by replacing the triphenylmethoxy moiety by a variety of substituted amines and carboxamides. In all the cases, the selectivity against the mitochondrial enzyme was either maintained or improved, and several derivatives were almost as potent as the parent compound. A molecular model was built that can account for the observed selectivities.
Collapse
|
7
|
Balzarini J, Hernández AI, Roche P, Esnouf R, Karlsson A, Camarasa MJ, Pérez-Pérez MJ. Non-nucleoside inhibitors of mitochondrial thymidine kinase (TK-2) differentially inhibit the closely related herpes simplex virus type 1 TK and Drosophila melanogaster multifunctional deoxynucleoside kinase. Mol Pharmacol 2003; 63:263-70. [PMID: 12527796 DOI: 10.1124/mol.63.2.263] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
5'-O-Trityl derivatives of thymidine (dThd), (E)-5-(2-bromovinyl)-2'-deoxyuridine (BVDU), and their acyclic analogs 1-[(Z)-4-triphenylmethoxy-2-butenyl]thymine (KIN-12) and (E)-5-(2-bromovinyl)-1-[(Z)-4-triphenylmethoxy-2-butenyl]uracil (KIN-52) have been synthesized and evaluated for their inhibitory activity against the amino acid sequence related mitochondrial dThd kinase (TK-2), herpes simplex virus type 1 (HSV-1) TK, and Drosophila melanogaster multifunctional 2'-deoxynucleoside kinase (Dm-dNK). Several compounds proved markedly inhibitory to these enzymes and represent a new generation of nucleoside kinase inhibitors. KIN-52 was the most potent and selective inhibitor of TK-2 (IC(50), 1.3 microM; K(i), 0.50 microM; K(i)/K(m), 0.37) but was not inhibitory against HSV-1 TK and Dm-dNK at 100 microM. As found for the alternative substrate BVDU, the tritylated compounds competitively inhibited the three enzymes with respect to dThd. However, whereas BVDU behaved as a noncompetitive inhibitor (alternative substrate) of TK-2 and HSV-1 TK with respect to ATP as the varying substrate, the novel tritylated enzyme inhibitors emerged as reversible purely uncompetitive inhibitors of these enzymes. Computer-assisted modeling studies are in agreement with these findings. The tritylated compounds do not act as alternative substrates and they showed a type of kinetics against the nucleoside kinases different from that of BVDU. KIN-12, and particularly KIN-52, are the very first non-nucleoside specific inhibitors of TK-2 reported and may be useful for studying the physiological role of the mitochondrial TK-2 enzyme.
Collapse
Affiliation(s)
- Jan Balzarini
- Rega Institute for Medical Research, Katholieke Universiteit Leuven, Leuven, Belgium.
| | | | | | | | | | | | | |
Collapse
|
8
|
Fagny C, Vandevelde M, Svoboda M, Robberecht P. Ribonucleotide reductase and thymidine phosphorylation: two potential targets of azodicarbonamide. Biochem Pharmacol 2002; 64:451-6. [PMID: 12147296 DOI: 10.1016/s0006-2952(02)01185-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Azodicarbonamide tested as an anti-HIV agent was reported to expulse zinc from viral zinc-cysteine factors and to inhibit calcium mobilization machinery. It has structural analogy with hydroxyurea that inhibits ribonucleotide reductase and could also act on this target. Azodicarbonamide was therefore tested for its capacity to modulate deoxyribonucleotides triphosphate pools alone or in combination with other agents in the lymphoblastic SUP-T1 cell line susceptible to HIV infection. The deoxyribonucleotides triphosphate were evaluated by an enzymatic assay using sequenase. Two hours exposure of SUP-T1 cells to 100 microM azodicarbonamide induced a 50% reduction of each deoxyribonucleotide triphosphate. Among other inhibitors of nucleotide metabolism (hydroxyurea, methotrexate and thymidine), hydroxyurea only reproduces the effect of azodicarbonamide. This suggests, but does not demonstrate directly, that azodicarbonamide inhibits ribonucleotide reductase activity. The combination of azodicarbonamide with each of these inhibitors affected particularly the dCTP pool. During this study it was also suggested that azodicarbonamide could interfere with thymidine phosphorylation. Thymidine phosphorylating activity was measured with 3H-thymidine as substrate. In acellular preparations, azodicarbonamide also non-competitively inhibits thymidine phosphorylating activity. This effect was not reproduced by hydroxyurea. Thus, in vitro azodicarbonamide decreases the intracellular pool of deoxyribonucleotide and thymidine phosphorylation.
Collapse
Affiliation(s)
- Christine Fagny
- Department of Biochemistry and Nutrition, Faculty of Medicine, Université Libre de Bruxelles, Brussels, Belgium
| | | | | | | |
Collapse
|
9
|
Manfredini S, Baraldi PG, Durini E, Porcu L, Angusti A, Vertuani S, Solaroli N, De Clercq E, Karlsson A, Balzarini J. Design, synthesis and enzymatic activity of highly selective human mitochondrial thymidine kinase inhibitors. Bioorg Med Chem Lett 2001; 11:1329-32. [PMID: 11392548 DOI: 10.1016/s0960-894x(01)00207-4] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Highly selective arabinofuranosyl nucleosides, which inhibit the mitochondrial thymidine kinase (TK-2) without affecting the closely related herpes simplex virus type 1 thymidine kinase (HSV-1 TK), varicella-zoster virus thymidine kinase (VZV-TK), cytosolic thymidine kinase (TK-1) or the multifunctional Drosophila melanogaster deoxyribonucleoside kinase (Dm-dNK), have been obtained. SAR studies indicate a close relation between the length of the substituent at the 2' position of the arabinofuranosyl moiety and the inhibitory activity.
Collapse
Affiliation(s)
- S Manfredini
- Dipartimento di Scienze Farmaceutiche, Università di Ferrara, Italy.
| | | | | | | | | | | | | | | | | | | |
Collapse
|