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Parry TL, Melehani JH, Ranek MJ, Willis MS. Functional Amyloid Signaling via the Inflammasome, Necrosome, and Signalosome: New Therapeutic Targets in Heart Failure. Front Cardiovasc Med 2015; 2:25. [PMID: 26664897 PMCID: PMC4671334 DOI: 10.3389/fcvm.2015.00025] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2015] [Accepted: 04/28/2015] [Indexed: 11/13/2022] Open
Abstract
As the most common cause of death and disability, globally, heart disease remains an incompletely understood enigma. A growing number of cardiac diseases are being characterized by the presence of misfolded proteins underlying their pathophysiology, including cardiac amyloidosis and dilated cardiomyopathy (DCM). At least nine precursor proteins have been implicated in the development of cardiac amyloidosis, most commonly caused by multiple myeloma light chain disease and disease-causing mutant or wildtype transthyretin (TTR). Similarly, aggregates with PSEN1 and COFILIN-2 have been identified in up to one-third of idiopathic DCM cases studied, indicating the potential predominance of misfolded proteins in heart failure. In this review, we present recent evidence linking misfolded proteins mechanistically with heart failure and present multiple lines of new therapeutic approaches that target the prevention of misfolded proteins in cardiac TTR amyloid disease. These include multiple small molecule pharmacological chaperones now in clinical trials designed specifically to support TTR folding by rational design, such as tafamidis, and chaperones previously developed for other purposes, such as doxycycline and tauroursodeoxycholic acid. Last, we present newly discovered non-pathological "functional" amyloid structures, such as the inflammasome and necrosome signaling complexes, which can be activated directly by amyloid. These may represent future targets to successfully attenuate amyloid-induced proteotoxicity in heart failure, as the inflammasome, for example, is being therapeutically inhibited experimentally in autoimmune disease. Together, these studies demonstrate multiple novel points in which new therapies may be used to primarily prevent misfolded proteins or to inhibit their downstream amyloid-mediated effectors, such as the inflammasome, to prevent proteotoxicity in heart failure.
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Affiliation(s)
- Traci L Parry
- McAllister Heart Institute, University of North Carolina , Chapel Hill, NC , USA
| | - Jason H Melehani
- Department of Pharmacology, University of North Carolina , Chapel Hill, NC , USA
| | - Mark J Ranek
- Section of Cardiology, Department of Medicine, The Institute for CardioScience, Johns Hopkins Medical Institutes , Baltimore, MD , USA
| | - Monte S Willis
- McAllister Heart Institute, University of North Carolina , Chapel Hill, NC , USA ; Department of Pathology and Laboratory Medicine, University of North Carolina , Chapel Hill, NC , USA
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52
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Vekariya RH, Patel HD. Sulfonic Acid–Functionalized Silica (SiO2-Pr-SO3H) as a Solid and a Heterogeneous Catalyst in Green Organic Synthesis: Recent Advances. SYNTHETIC COMMUN 2015. [DOI: 10.1080/00397911.2014.997364] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Rajesh H. Vekariya
- Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad, Gujarat, India
| | - Hitesh D. Patel
- Department of Chemistry, School of Sciences, Gujarat University, Ahmedabad, Gujarat, India
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Zhang G, Wang P, Yang F, Wu Y. Copper-catalyzed synthesis of 2-arylbenzoxazoles from o -aminophenol derivatives with arylmethyl chlorides. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.11.040] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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54
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Banerjee A, Mukhopadhyay BP. An insight to the conserved water mediated dynamics of catalytic His88 and its recognition to thyroxin and RBP binding residues in human transthyretin. J Biomol Struct Dyn 2014; 33:1973-88. [DOI: 10.1080/07391102.2014.984632] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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55
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Demmer CS, Bunch L. Benzoxazoles and oxazolopyridines in medicinal chemistry studies. Eur J Med Chem 2014; 97:778-85. [PMID: 25487760 DOI: 10.1016/j.ejmech.2014.11.064] [Citation(s) in RCA: 90] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Revised: 11/14/2014] [Accepted: 11/30/2014] [Indexed: 12/20/2022]
Abstract
The benzoxazole heterocycle is often found in ligands targeting a plethora of receptors and enzymes. By analysis of published X-ray structures, this review aims at highlighting key interactions which the benzoxazole may engage in with its host protein. Furthermore, bioavailability, metabolism and the use of benzoxazole as a bioisostere are discussed. The review is extended to cover structure-activity relationship studies of 2-substituted benzoxazoles, 2-substituted oxazolopyridines, and in perspective, application of the recently published novel heterocycle oxazolopyrazine in medicinal chemistry studies.
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Affiliation(s)
- Charles S Demmer
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark
| | - Lennart Bunch
- Department of Drug Design and Pharmacology, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
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56
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Obici L, Merlini G. An overview of drugs currently under investigation for the treatment of transthyretin-related hereditary amyloidosis. Expert Opin Investig Drugs 2014; 23:1239-51. [PMID: 25003808 DOI: 10.1517/13543784.2014.922541] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
INTRODUCTION Transthyretin (TTR)-related hereditary amyloidosis is an adult-onset, dominantly inherited, systemic neurodegenerative disease endemic in some populations. Stabilization of the native structure of TTR by small-molecule ligands has recently proved effective in slowing neurological progression. Two drugs, tafamidis and diflunisal, are now available for most patients, particularly in the early stage of the disease. However, this disorder remains life threatening with several unmet needs. There are great expectations for a number of novel agents undergoing investigation. AREAS COVERED The authors review the current investigational drugs for the treatment of TTR amyloidosis according to the different steps of the fibrillogenesis process they target. Innovative approaches include suppression of TTR secretion, prevention of TTR misfolding by stronger stabilizers identified through structure-based design and high-throughput screening methodologies as well as the redirection of pathogenic aggregates toward nontoxic species and reabsorption of deposits through amyloid disrupters and immunotherapy. EXPERT OPINION Suppression of TTR synthesis by antisense oligonucleotides and small-interfering RNA is presently one of the most promising therapeutic approaches. However, well-designed clinical trials are required to establish their safety and efficacy compared with liver transplantation, tafamidis and diflunisal. With a longer time frame, it may be possible to develop combination therapies that target multiple steps of the aggregation process that could provide the best long-life effective treatments for this devastating disease.
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Affiliation(s)
- Laura Obici
- Amyloidosis Research and Treatment Center, IRCCS Fondazione Policlinico San Matteo , Viale Golgi, 19, 27100 Pavia , Italy
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57
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Wang XZ, Jiang GB, Lin GJ, Huang HL, Xie YY, Liu YJ. Synthesis, molecular structure, DNA-binding, cytotoxicity, apoptosis and antioxidant activity of compounds containing aryloxazole. Eur J Med Chem 2014; 80:192-200. [DOI: 10.1016/j.ejmech.2014.04.053] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 04/15/2014] [Accepted: 04/15/2014] [Indexed: 01/21/2023]
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59
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Milroy LG, Grossmann TN, Hennig S, Brunsveld L, Ottmann C. Modulators of Protein–Protein Interactions. Chem Rev 2014; 114:4695-748. [DOI: 10.1021/cr400698c] [Citation(s) in RCA: 352] [Impact Index Per Article: 35.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Lech-Gustav Milroy
- Laboratory
of Chemical Biology and Institute of Complex Molecular Systems, Department
of Biomedical Engineering, Technische Universiteit Eindhoven, Den Dolech
2, 5612 AZ Eindhoven, The Netherlands
| | - Tom N. Grossmann
- Chemical Genomics Centre of the Max Planck Society, Otto-Hahn Straße 15, 44227 Dortmund, Germany
- Department
of Chemistry and Chemical Biology, Technical University Dortmund, Otto-Hahn-Strasse 6, 44227 Dortmund, Germany
| | - Sven Hennig
- Chemical Genomics Centre of the Max Planck Society, Otto-Hahn Straße 15, 44227 Dortmund, Germany
| | - Luc Brunsveld
- Laboratory
of Chemical Biology and Institute of Complex Molecular Systems, Department
of Biomedical Engineering, Technische Universiteit Eindhoven, Den Dolech
2, 5612 AZ Eindhoven, The Netherlands
| | - Christian Ottmann
- Laboratory
of Chemical Biology and Institute of Complex Molecular Systems, Department
of Biomedical Engineering, Technische Universiteit Eindhoven, Den Dolech
2, 5612 AZ Eindhoven, The Netherlands
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60
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Zhu YM, Shen JK, Wang JM, Jiang X, Tang T. Nickel-Catalyzed Ligand-Free Systhesis of Benzoxazoles and Oxazolines via Isocyanide Insertion. HETEROCYCLES 2014. [DOI: 10.3987/com-14-12996] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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61
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Boominathan SSK, Hu WP, Senadi GC, Vandavasi JK, Wang JJ. A one-pot hypoiodite catalysed oxidative cycloetherification approach to benzoxazoles. Chem Commun (Camb) 2014; 50:6726-8. [DOI: 10.1039/c4cc02425g] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A TBAI/TBHP catalysed one-pot approach to α-ketobenzoxazoles was developed in high yields with a wide substrate scope.
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62
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Wang H, Yang H, Li Y, Duan XH. Oxone-mediated oxidative carbon-heteroatom bond cleavage: synthesis of benzoxazinones from benzoxazoles with α-oxocarboxylic acids. RSC Adv 2014. [DOI: 10.1039/c3ra47660j] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
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63
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Gu L, Wang W, Xiong Y, Huang X, Li G. Synthesis of 2-Arylbenzoxazoles through Oxidation of C-H Bonds Adjacent to Oxygen Atoms. European J Org Chem 2013. [DOI: 10.1002/ejoc.201301504] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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64
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Suh EH, Liu Y, Connelly S, Genereux JC, Wilson IA, Kelly JW. Stilbene vinyl sulfonamides as fluorogenic sensors of and traceless covalent kinetic stabilizers of transthyretin that prevent amyloidogenesis. J Am Chem Soc 2013; 135:17869-80. [PMID: 24180271 DOI: 10.1021/ja408230k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Small molecules that react selectively with a specific non-enzyme drug-target protein in a complex biological environment without displacement of a leaving group (tracelessly) are rare and highly desirable. Herein we describe the development of a family of fluorogenic stilbene-based vinyl amides and vinyl sulfonamides that covalently modify transthyretin (TTR) tracelessly. These small molecules bind selectively to TTR in complex biological environments and then undergo a rapid and chemoselective 1,4-Michael addition with the pKa-perturbed Lys-15 ε-amino group of TTR. Replacing the vinyl amide in 2 with the more reactive vinyl sulfonamide in 4 hastens the conjugation kinetics. X-ray cocrystallography verified the formation of the secondary amine bond mediating the conjugation in the case of 2 and 4 and confirmed the expected orientation of the stilbene within the TTR binding sites. Vinyl amide 2 and vinyl sulfonamide 4 potently inhibit TTR dissociation and amyloid fibril formation in vitro. The TTR binding selectivity, modification yield, and reaction chemoselectivity of vinyl sulfonamide 4 are good enough in human plasma to serve as a starting point for medicinal chemistry efforts. Moreover, vinyl sulfonamide 4 is fluorogenic: it exhibits minimal background fluorescence in complex biological environments, remains dark upon binding to TTR, and becomes fluorescent only upon reaction with TTR. The fluorogenicity of 4 was utilized to accurately quantify the native TTR concentration in Escherichia coli lysate using a fluorescence plate reader.
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Affiliation(s)
- Eul Hyun Suh
- Department of Chemistry, ‡The Skaggs Institute for Chemical Biology, §Department of Integrative Structural and Computational Biology, and ∥Department of Molecular and Experimental Medicine, The Scripps Research Institute , La Jolla, California 92037, United States
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65
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Zhou ZL, Liu HL, Wu JW, Tsao CW, Chen WH, Liu KT, Ho Y. Computer-aided Discovery of Potential Inhibitors for Transthyretin-related Amyloidosis. J CHIN CHEM SOC-TAIP 2013. [DOI: 10.1002/jccs.201300172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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66
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Nencetti S, Rossello A, Orlandini E. Tafamidis (Vyndaqel): a light for FAP patients. ChemMedChem 2013; 8:1617-9. [PMID: 24000164 DOI: 10.1002/cmdc.201300245] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2013] [Revised: 07/23/2013] [Indexed: 11/06/2022]
Abstract
Slowing FAP progression: Tafamidis meglumine is a small molecule capable of stabilizing the transthyretin (TTR) tetramer. Tafamidis acts in a similar way to the natural hormone T4, prevents TTR amyloid fibril formation, and offers a potential alternative to liver transplantation for the treatment of patients with TTR familial amyloid polyneuropathies (TTR-FAP).
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Affiliation(s)
- Susanna Nencetti
- Dipartimento di Farmacia, Università di Pisa, Via Bonanno 6, 56126 Pisa (Italy).
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67
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Myung N, Connelly S, Kim B, Park SJ, Wilson IA, Kelly JW, Choi S. Bifunctional coumarin derivatives that inhibit transthyretin amyloidogenesis and serve as fluorescent transthyretin folding sensors. Chem Commun (Camb) 2013; 49:9188-9190. [PMID: 23989101 DOI: 10.1039/c3cc44667k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
We describe coumarin derivatives that are non-fluorescent in aqueous buffers and that very selectively bind to transthyretin (TTR) in complex biological environments potently inhibiting TTR amyloidogenesis while also exhibiting sensitive off-on fluorescent sensing of the properly folded quaternary structure of TTR.
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Affiliation(s)
- Nojoon Myung
- Department of New Drug Discovery and Development, Chungnam National University, Daejon, 305-764, Republic of Korea
| | - Stephen Connelly
- Department of Integrative Structural and Computational Biology, and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
| | - Boyoung Kim
- Department of New Drug Discovery and Development, Chungnam National University, Daejon, 305-764, Republic of Korea
| | - Sung Jean Park
- College of Pharmacy, Gachon University, 534-2 Yeonsu 3-dong, Yeonsu-gu, Incheon 406-799, Republic of Korea
| | - Ian A Wilson
- Department of Integrative Structural and Computational Biology, and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
| | - Jeffery W Kelly
- Departments of Chemistry and Molecular and Experimental Medicine, and The Skaggs Institute for Chemical Biology, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
| | - Sungwook Choi
- Department of New Drug Discovery and Development, Chungnam National University, Daejon, 305-764, Republic of Korea
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68
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Banerjee A, Bairagya HR, Mukhopadhyay BP, Nandi TK, Mishra DK. Conserved water mediated H-bonding dynamics of Ser117 and Thr119 residues in human transthyretin–thyroxin complexation: Inhibitor modeling study through docking and molecular dynamics simulation. J Mol Graph Model 2013; 44:70-80. [DOI: 10.1016/j.jmgm.2013.04.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2012] [Revised: 03/22/2013] [Accepted: 04/29/2013] [Indexed: 11/30/2022]
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69
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3D-QSAR and docking studies on 2-arylbenzoxazole and linker-Y transthyretin amyloidogenesis inhibitors. Sci China Chem 2013. [DOI: 10.1007/s11426-013-4894-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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70
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Grimster NP, Connelly S, Baranczak A, Dong J, Krasnova LB, Sharpless KB, Powers ET, Wilson IA, Kelly JW. Aromatic sulfonyl fluorides covalently kinetically stabilize transthyretin to prevent amyloidogenesis while affording a fluorescent conjugate. J Am Chem Soc 2013; 135:5656-68. [PMID: 23350654 PMCID: PMC3630275 DOI: 10.1021/ja311729d] [Citation(s) in RCA: 122] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Molecules that bind selectively to a given protein and then undergo a rapid chemoselective reaction to form a covalent conjugate have utility in drug development. Herein a library of 1,3,4-oxadiazoles substituted at the 2 position with an aryl sulfonyl fluoride and at the 5 position with a substituted aryl known to have high affinity for the inner thyroxine binding subsite of transthyretin (TTR) was conceived of by structure-based design principles and was chemically synthesized. When bound in the thyroxine binding site, most of the aryl sulfonyl fluorides react rapidly and chemoselectively with the pKa-perturbed K15 residue, kinetically stabilizing TTR and thus preventing amyloid fibril formation, known to cause polyneuropathy. Conjugation t50s range from 1 to 4 min, ~1400 times faster than the hydrolysis reaction outside the thyroxine binding site. X-ray crystallography confirms the anticipated binding orientation and sheds light on the sulfonyl fluoride activation leading to the sulfonamide linkage to TTR. A few of the aryl sulfonyl fluorides efficiently form conjugates with TTR in plasma. Eleven of the TTR covalent kinetic stabilizers synthesized exhibit fluorescence upon conjugation and therefore could have imaging applications as a consequence of the environment sensitive fluorescence of the chromophore.
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Affiliation(s)
- Neil P Grimster
- Department of Chemistry, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, California 92037, USA
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71
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Scholfield MR, Zanden CMV, Carter M, Ho PS. Halogen bonding (X-bonding): a biological perspective. Protein Sci 2013; 22:139-52. [PMID: 23225628 PMCID: PMC3588911 DOI: 10.1002/pro.2201] [Citation(s) in RCA: 318] [Impact Index Per Article: 28.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Revised: 11/20/2012] [Accepted: 11/21/2012] [Indexed: 11/05/2022]
Abstract
The concept of the halogen bond (or X-bond) has become recognized as contributing significantly to the specificity in recognition of a large class of halogenated compounds. The interaction is most easily understood as primarily an electrostatically driven molecular interaction, where an electropositive crown, or σ-hole, serves as a Lewis acid to attract a variety of electron-rich Lewis bases, in analogous fashion to a classic hydrogen bonding (H-bond) interaction. We present here a broad overview of X-bonds from the perspective of a biologist who may not be familiar with this recently rediscovered class of interactions and, consequently, may be interested in how they can be applied as a highly directional and specific component of the molecular toolbox. This overview includes a discussion for where X-bonds are found in biomolecular structures, and how their structure-energy relationships are studied experimentally and modeled computationally. In total, our understanding of these basic concepts will allow X-bonds to be incorporated into strategies for the rational design of new halogenated inhibitors against biomolecular targets or toward molecular engineering of new biological-based materials.
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Affiliation(s)
| | | | | | - P Shing Ho
- Department of Biochemistry and Molecular Biology, Colorado State UniversityFort Collins, Colorado 80523-1870
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72
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Gu L, Jin C, Guo J, Zhang L, Wang W. A novel strategy for the construction of substituted benzoxazoles via a tandem oxidative process. Chem Commun (Camb) 2013; 49:10968-70. [DOI: 10.1039/c3cc46375c] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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73
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Ziarani GM, Badiei A, Nahad MS, Hassanzadeh M. Application of SBA-Pr-SO3H in the synthesis of benzoxazole derivatives. ACTA ACUST UNITED AC 2012. [DOI: 10.5155/eurjchem.3.4.433-436.673] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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74
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Johnson SM, Connelly S, Fearns C, Powers ET, Kelly JW. The transthyretin amyloidoses: from delineating the molecular mechanism of aggregation linked to pathology to a regulatory-agency-approved drug. J Mol Biol 2012; 421:185-203. [PMID: 22244854 PMCID: PMC3350832 DOI: 10.1016/j.jmb.2011.12.060] [Citation(s) in RCA: 231] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2011] [Revised: 12/22/2011] [Accepted: 12/29/2011] [Indexed: 12/31/2022]
Abstract
Transthyretin (TTR) is one of the many proteins that are known to misfold and aggregate (i.e., undergo amyloidogenesis) in vivo. The process of TTR amyloidogenesis causes nervous system and/or heart pathology. While several of these maladies are associated with mutations that destabilize the native TTR quaternary and/or tertiary structure, wild-type TTR amyloidogenesis also leads to the degeneration of postmitotic tissue. Over the past 20 years, much has been learned about the factors that influence the propensity of TTR to aggregate. This biophysical information led to the development of a therapeutic strategy, termed "kinetic stabilization," to prevent TTR amyloidogenesis. This strategy afforded the drug tafamidis which was recently approved by the European Medicines Agency for the treatment of TTR familial amyloid polyneuropathy, the most common familial TTR amyloid disease. Tafamidis is the first and currently the only medication approved to treat TTR familial amyloid polyneuropathy. Here we review the biophysical basis for the kinetic stabilization strategy and the structure-based drug design effort that led to this first-in-class pharmacologic agent.
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Affiliation(s)
- Steven M. Johnson
- Department of Chemistry and The Skaggs Institute for Chemical Biology, La Jolla, California 92037, USA
| | - Stephen Connelly
- Department of Molecular Biology, La Jolla, California 92037, USA
| | - Colleen Fearns
- Department of Chemistry and The Skaggs Institute for Chemical Biology, La Jolla, California 92037, USA
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, California 92037, USA
| | - Evan T. Powers
- Department of Chemistry and The Skaggs Institute for Chemical Biology, La Jolla, California 92037, USA
| | - Jeffery W. Kelly
- Department of Chemistry and The Skaggs Institute for Chemical Biology, La Jolla, California 92037, USA
- Department of Molecular and Experimental Medicine, The Scripps Research Institute, La Jolla, California 92037, USA
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75
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Trivella DBB, dos Reis CV, Lima LMTR, Foguel D, Polikarpov I. Flavonoid interactions with human transthyretin: combined structural and thermodynamic analysis. J Struct Biol 2012; 180:143-53. [PMID: 22842046 DOI: 10.1016/j.jsb.2012.07.008] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2012] [Revised: 07/10/2012] [Accepted: 07/16/2012] [Indexed: 11/29/2022]
Abstract
Transthyretin (TTR) is a carrier protein involved in human amyloidosis. The development of small molecules that may act as TTR amyloid inhibitors is a promising strategy to treat these pathologies. Here we selected and characterized the interaction of flavonoids with the wild type and the V30M amyloidogenic mutant TTR. TTR acid aggregation was evaluated in vitro in the presence of the different flavonoids. The best TTR aggregation inhibitors were studied by Isothermal Titration Calorimetry (ITC) in order to reveal their thermodynamic signature of binding to TTRwt. Crystal structures of TTRwt in complex with the top binders were also obtained, enabling us to in depth inspect TTR interactions with these flavonoids. The results indicate that changing the number and position of hydroxyl groups attached to the flavonoid core strongly influence flavonoid recognition by TTR, either by changing ligand affinity or its mechanism of interaction with the two sites of TTR. We also compared the results obtained for TTRwt with the V30M mutant structure in the apo form, allowing us to pinpoint structural features that may facilitate or hamper ligand binding to the V30M mutant. Our data show that the TTRwt binding site is labile and, in particular, the central region of the cavity is sensible for the small differences in the ligands tested and can be influenced by the Met30 amyloidogenic mutation, therefore playing important roles in flavonoid binding affinity, mechanism and mutant protein ligand binding specificities.
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Affiliation(s)
- Daniela B B Trivella
- Instituto de Física de São Carlos, Universidade de São Paulo, 13560-970 São Carlos, SP, Brazil.
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76
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Tafamidis, a potent and selective transthyretin kinetic stabilizer that inhibits the amyloid cascade. Proc Natl Acad Sci U S A 2012; 109:9629-34. [PMID: 22645360 DOI: 10.1073/pnas.1121005109] [Citation(s) in RCA: 506] [Impact Index Per Article: 42.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The transthyretin amyloidoses (ATTR) are invariably fatal diseases characterized by progressive neuropathy and/or cardiomyopathy. ATTR are caused by aggregation of transthyretin (TTR), a natively tetrameric protein involved in the transport of thyroxine and the vitamin A-retinol-binding protein complex. Mutations within TTR that cause autosomal dominant forms of disease facilitate tetramer dissociation, monomer misfolding, and aggregation, although wild-type TTR can also form amyloid fibrils in elderly patients. Because tetramer dissociation is the rate-limiting step in TTR amyloidogenesis, targeted therapies have focused on small molecules that kinetically stabilize the tetramer, inhibiting TTR amyloid fibril formation. One such compound, tafamidis meglumine (Fx-1006A), has recently completed Phase II/III trials for the treatment of Transthyretin Type Familial Amyloid Polyneuropathy (TTR-FAP) and demonstrated a slowing of disease progression in patients heterozygous for the V30M TTR mutation. Herein we describe the molecular and structural basis of TTR tetramer stabilization by tafamidis. Tafamidis binds selectively and with negative cooperativity (K(d)s ~2 nM and ~200 nM) to the two normally unoccupied thyroxine-binding sites of the tetramer, and kinetically stabilizes TTR. Patient-derived amyloidogenic variants of TTR, including kinetically and thermodynamically less stable mutants, are also stabilized by tafamidis binding. The crystal structure of tafamidis-bound TTR suggests that binding stabilizes the weaker dimer-dimer interface against dissociation, the rate-limiting step of amyloidogenesis.
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77
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Vekrellis K, Stefanis L. Targeting intracellular and extracellular alpha-synuclein as a therapeutic strategy in Parkinson's disease and other synucleinopathies. Expert Opin Ther Targets 2012; 16:421-32. [DOI: 10.1517/14728222.2012.674111] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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78
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Abstract
The term amyloid describes the deposition in the extracellular space of certain proteins in a highly characteristic, insoluble fibrillar form. Amyloidosis describes the various clinical syndromes that occur as a result of damage by amyloid deposits in tissues and organs throughout the body. The clinical significance of amyloid varies enormously, ranging from incidental asymptomatic deposits to localized disease through to rapidly fatal systemic forms that can affect multiple vital organs. Currently available therapy is focused on reducing the supply of the respective amyloid fibril precursor protein and supportive medical care, which together have greatly improved survival. Chemotherapy and anti-inflammatory treatment for the disorders that underlie AL and AA amyloidosis are guided by serial measurements of the respective circulating amyloid precursor proteins, i.e. serial serum free light chains in AL and serum amyloid A protein in AA type. Quality of life and prognosis of some forms of hereditary systemic amyloidosis can be improved by liver and other organ transplants. Various new therapies, ranging from silencing RNA, protein stabilizers to monoclonal antibodies, aimed at inhibiting fibril precursor supply, fibril formation or the persistence of amyloid deposits, are in development; some are already in clinical phase.
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Affiliation(s)
- Jennifer H Pinney
- UCL Centre for Nephrology, UCL Medical School, Royal Free Hampstead NHS Trust, Rowland Hill Street, London NW3 2PF, UK.
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79
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Abstract
There has been much progress in our understanding of transthyretin (TTR)-related amyloidosis including familial amyloidotic polyneuropathy (FAP), senile systemic amyloidosis and its related disorders from many clinical and experimental aspects. FAP is an inherited severe systemic amyloidosis caused by mutated TTR, and characterized by amyloid deposition mainly in the peripheral nervous system and the heart. Liver transplantation is the only available treatment for the disease. FAP is now recognized not to be a rare disease, and to have many variations based on genetical and biochemical variations of TTR. This chapter covers the recent advances in the clinical and pathological aspects of, and therapeutic approaches to FAP, and the trend as to the molecular pathogenesis of TTR.
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Affiliation(s)
- Takamura Nagasaka
- Department of Neurology, University of Yamanashi, 1110 Shimokato, 409-3898, Chuou-city, Yamanashi, Japan,
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80
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Lindquist SL, Kelly JW. Chemical and biological approaches for adapting proteostasis to ameliorate protein misfolding and aggregation diseases: progress and prognosis. Cold Spring Harb Perspect Biol 2011; 3:a004507. [PMID: 21900404 PMCID: PMC3225948 DOI: 10.1101/cshperspect.a004507] [Citation(s) in RCA: 147] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Maintaining the proteome to preserve the health of an organism in the face of developmental changes, environmental insults, infectious diseases, and rigors of aging is a formidable task. The challenge is magnified by the inheritance of mutations that render individual proteins subject to misfolding and/or aggregation. Maintenance of the proteome requires the orchestration of protein synthesis, folding, degradation, and trafficking by highly conserved/deeply integrated cellular networks. In humans, no less than 2000 genes are involved. Stress sensors detect the misfolding and aggregation of proteins in specific organelles and respond by activating stress-responsive signaling pathways. These culminate in transcriptional and posttranscriptional programs that up-regulate the homeostatic mechanisms unique to that organelle. Proteostasis is also strongly influenced by the general properties of protein folding that are intrinsic to every proteome. These include the kinetics and thermodynamics of the folding, misfolding, and aggregation of individual proteins. We examine a growing body of evidence establishing that when cellular proteostasis goes awry, it can be reestablished by deliberate chemical and biological interventions. We start with approaches that employ chemicals or biological agents to enhance the general capacity of the proteostasis network. We then introduce chemical approaches to prevent the misfolding or aggregation of specific proteins through direct binding interactions. We finish with evidence that synergy is achieved with the combination of mechanistically distinct approaches to reestablish organismal proteostasis.
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Affiliation(s)
- Susan L Lindquist
- Whitehead Institute for Biomedical Research, Department of Biology, Massachusetts Institute of Technology, Howard Hughes Medical Institute, Cambridge, Massachusetts 02142, USA.
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81
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Microwave-assisted efficient one-step synthesis of amides from ketones and benzoxazoles from (2-hydroxyaryl) ketones with acetohydroxamic acid using sulfuric acid as the catalyst. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.09.019] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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82
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Phenylboronic acid catalyzed-cyanide promoted, one-pot synthesis of 2-(2-hydroxyphenyl)benzoxazole derivatives. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.06.039] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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83
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Chancellor DR, Davies KE, De Moor O, Dorgan CR, Johnson PD, Lambert AG, Lawrence D, Lecci C, Maillol C, Middleton PJ, Nugent G, Poignant SD, Potter AC, Price PD, Pye RJ, Storer R, Tinsley JM, van Well R, Vickers R, Vile J, Wilkes FJ, Wilson FX, Wren SP, Wynne GM. Discovery of 2-arylbenzoxazoles as upregulators of utrophin production for the treatment of Duchenne muscular dystrophy. J Med Chem 2011; 54:3241-50. [PMID: 21456623 DOI: 10.1021/jm200135z] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
A series of novel 2-arylbenzoxazoles that upregulate the production of utrophin in murine H2K cells, as assessed using a luciferase reporter linked assay, have been identified. This compound class appears to hold considerable promise as a potential treatment for Duchenne muscular dystrophy. Following the delineation of structure-activity relationships in the series, a number of potent upregulators were identified, and preliminary ADME evaluation is described. These studies have resulted in the identification of 1, a compound that has been progressed to clinical trials.
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Affiliation(s)
- Daniel R Chancellor
- Summit plc , 91 Milton Park, Abingdon, Oxfordshire, OX14 4RY, United Kingdom
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84
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A simple protocol for the synthesis of 2-arylbenzoxazoles by oxidation with o-iodoxybenzoic acid (IBX) and its application in the synthesis of arylbenzoxazole-containing amino acids. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2010.11.057] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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85
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Qiao JX, Wang TC, Hu C, Li J, Wexler RR, Lam PYS. Transformation of Anionically Activated Trifluoromethyl Groups to Heterocycles under Mild Aqueous Conditions. Org Lett 2011; 13:1804-7. [DOI: 10.1021/ol200326u] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jennifer X. Qiao
- Research & Development, Bristol-Myers Squibb Company, Princeton, New Jersey 08543, United States
| | - Tammy C. Wang
- Research & Development, Bristol-Myers Squibb Company, Princeton, New Jersey 08543, United States
| | - Carol Hu
- Research & Development, Bristol-Myers Squibb Company, Princeton, New Jersey 08543, United States
| | - Jianqing Li
- Research & Development, Bristol-Myers Squibb Company, Princeton, New Jersey 08543, United States
| | - Ruth R. Wexler
- Research & Development, Bristol-Myers Squibb Company, Princeton, New Jersey 08543, United States
| | - Patrick Y. S. Lam
- Research & Development, Bristol-Myers Squibb Company, Princeton, New Jersey 08543, United States
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86
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Leng Y, Yang F, Zhu W, Wu Y, Li X. Chlorination and ortho-acetoxylation of 2-arylbenzoxazoles. Org Biomol Chem 2011; 9:5288-96. [DOI: 10.1039/c1ob05223c] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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87
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Choi S, Kelly JW. A competition assay to identify amyloidogenesis inhibitors by monitoring the fluorescence emitted by the covalent attachment of a stilbene derivative to transthyretin. Bioorg Med Chem 2010; 19:1505-14. [PMID: 21273081 DOI: 10.1016/j.bmc.2010.12.050] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2010] [Revised: 12/22/2010] [Accepted: 12/23/2010] [Indexed: 12/21/2022]
Abstract
Herein we demonstrate that competition between candidate kinetic stabilizer binding to transthyretin (TTR) and stilbene binding to and reaction with the same thyroxine sites within TTR can be utilized to discover potent and highly selective non-covalent TTR amyloidogenesis inhibitors. We report two stilbenes, S1 and S2, for use in distinct competition assays. Each bind selectively to TTR and then chemoselectively react to form an amide bond with the Lys-15 residue of TTR, creating a fluorescent conjugate. We used 28 TTR kinetic stabilizers exhibiting a known spectrum of plasma TTR binding selectivities and TTR amyloid fibril inhibition efficacies to validate the 'TTR fluorescence conjugate competition assay'. The kinetic stabilizers competed with S1 for binding to recombinant TTR in buffer and with S2 for binding to endogenous levels of TTR in human blood serum. In both assay scenarios, we demonstrate that the lower the TTR-stilbene conjugate fluorescence after a 3 h competition, the greater the binding selectivity and potency of the candidate TTR kinetic stabilizer. These assays, particularly the assay utilizing S2 in human serum, replace two assays previously utilized to gather the same information. While not the focus of this manuscript, it is clear that the 'TTR fluorescence conjugate competition assay' could be adapted for high throughput screening applications.
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Affiliation(s)
- Sungwook Choi
- Department of New Drug Discovery and Development, Chungnam National University, Daejon 305-764, Republic of Korea
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88
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Trapping of palindromic ligands within native transthyretin prevents amyloid formation. Proc Natl Acad Sci U S A 2010; 107:20483-8. [PMID: 21059958 DOI: 10.1073/pnas.1008255107] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Transthyretin (TTR) amyloidosis is a fatal disease for which new therapeutic approaches are urgently needed. We have designed two palindromic ligands, 2,2'-(4,4'-(heptane-1,7-diylbis(oxy))bis(3,5-dichloro-4,1-phenylene)) bis(azanediyl)dibenzoic acid (mds84) and 2,2'-(4,4'-(undecane-1,11-diylbis(oxy))bis(3,5-dichloro-4,1-phenylene)) bis(azanediyl)dibenzoic acid (4ajm15), that are rapidly bound by native wild-type TTR in whole serum and even more avidly by amyloidogenic TTR variants. One to one stoichiometry, demonstrable in solution and by MS, was confirmed by X-ray crystallographic analysis showing simultaneous occupation of both T4 binding sites in each tetrameric TTR molecule by the pair of ligand head groups. Ligand binding by native TTR was irreversible under physiological conditions, and it stabilized the tetrameric assembly and inhibited amyloidogenic aggregation more potently than other known ligands. These superstabilizers are orally bioavailable and exhibit low inhibitory activity against cyclooxygenase (COX). They offer a promising platform for development of drugs to treat and prevent TTR amyloidosis.
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89
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Choi S, Ong DST, Kelly JW. A stilbene that binds selectively to transthyretin in cells and remains dark until it undergoes a chemoselective reaction to create a bright blue fluorescent conjugate. J Am Chem Soc 2010; 132:16043-51. [PMID: 20964336 DOI: 10.1021/ja104999v] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We describe a non-fluorescent, second generation stilbene that very selectively binds to transthyretin in complex biological environments and remains dark until it chemoselectively reacts with the pK(a)-perturbed Lys-15 ε-amino group of transthyretin to form a bright blue fluorescent conjugate. Stilbene A2 is mechanistically unusual in that it remains non-fluorescent in cell lysates lacking transthyretin, even though there is likely some proteome binding. Thus, it is especially useful for cellular imaging, as background fluorescence is undetectable until A2 reacts with transthyretin. The mechanistic basis for the effective lack of environment-sensitive fluorescence of A2 when bound to, but before reacting with, transthyretin is reported. Stilbene A2 exhibits sufficiently rapid transthyretin conjugation kinetics at 37 °C to enable pulse-chase experiments to be performed, in this case demonstrating that transthyretin is secreted from HeLa cells. As the chase compound, we employed C1, a cell-permeable, highly selective, non-covalent, transthyretin-binding dihydrostilbene that cannot become fluorescent. The progress reported is viewed as a first and necessary step toward our long-term goal of creating a one-chain, one-binding-site transthyretin tag, whose fluorescence can be regulated by adding A2 or an analogous molecule. Fusing proteins of interest to a one-chain, one-binding-site transthyretin tag regulated by A2 should be useful for studying folding, trafficking, and degradation in the cellular secretory pathway, utilizing pulse-chase experiments. Immediate applications of A2 include utilizing its conjugate fluorescence to quantify transthyretin concentration in human plasma, reflecting nutritional status, and determining the binding stoichiometry of kinetic stabilizer drugs to transthyretin in plasma.
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Affiliation(s)
- Sungwook Choi
- Department of New Drug Discovery and Development, Chungnam National University, Daejon, 305-764, Republic of Korea
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90
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Simões CJV, Mukherjee T, Brito RMM, Jackson RM. Toward the Discovery of Functional Transthyretin Amyloid Inhibitors: Application of Virtual Screening Methods. J Chem Inf Model 2010; 50:1806-20. [DOI: 10.1021/ci100250z] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Carlos J. V. Simões
- Institute of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom and Center for Neuroscience and Cell Biology and Chemistry Department, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Trishna Mukherjee
- Institute of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom and Center for Neuroscience and Cell Biology and Chemistry Department, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Rui M. M. Brito
- Institute of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom and Center for Neuroscience and Cell Biology and Chemistry Department, University of Coimbra, 3004-535 Coimbra, Portugal
| | - Richard M. Jackson
- Institute of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds LS2 9JT, United Kingdom and Center for Neuroscience and Cell Biology and Chemistry Department, University of Coimbra, 3004-535 Coimbra, Portugal
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91
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Miyata M, Sato T, Kugimiya M, Sho M, Nakamura T, Ikemizu S, Chirifu M, Mizuguchi M, Nabeshima Y, Suwa Y, Morioka H, Arimori T, Suico MA, Shuto T, Sako Y, Momohara M, Koga T, Morino-Koga S, Yamagata Y, Kai H. The Crystal Structure of the Green Tea Polyphenol (−)-Epigallocatechin Gallate−Transthyretin Complex Reveals a Novel Binding Site Distinct from the Thyroxine Binding Site,. Biochemistry 2010; 49:6104-14. [DOI: 10.1021/bi1004409] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Masanori Miyata
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Takashi Sato
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Miyuki Kugimiya
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Misato Sho
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | | | | | | | - Mineyuki Mizuguchi
- Faculty of Pharmaceutical Sciences, University of Toyama, Toyama 930-0914, Japan
| | - Yuko Nabeshima
- Faculty of Pharmaceutical Sciences, University of Toyama, Toyama 930-0914, Japan
| | | | | | | | - Mary Ann Suico
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Tsuyoshi Shuto
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Yasuhiro Sako
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Mamiko Momohara
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Tomoaki Koga
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | - Saori Morino-Koga
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
| | | | - Hirofumi Kai
- Department of Molecular Medicine, Global COE Cell Fate Regulation Research and Education Unit
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92
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93
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An efficient potassium cyanide-promoted synthesis of 2-arylbenzoxazoles from [4.3.0]boron heterobicycles. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.03.027] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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94
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Choi S, Reixach N, Connelly S, Johnson SM, Wilson IA, Kelly JW. A substructure combination strategy to create potent and selective transthyretin kinetic stabilizers that prevent amyloidogenesis and cytotoxicity. J Am Chem Soc 2010; 132:1359-70. [PMID: 20043671 DOI: 10.1021/ja908562q] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Transthyretin aggregation-associated proteotoxicity appears to cause several human amyloid diseases. Rate-limiting tetramer dissociation and monomer misfolding of transthyretin (TTR) occur before its aggregation into cross-beta-sheet amyloid fibrils. Small molecule binding to and preferential stabilization of the tetrameric state of TTR over the dissociative transition state raises the kinetic barrier for dissociation, imposing kinetic stabilization on TTR and preventing aggregation. This is an effective strategy to halt neurodegeneration associated with polyneuropathy, according to recent placebo-controlled clinical trial results. In three recent papers, we systematically ranked possibilities for the three substructures composing a typical TTR kinetic stabilizer, using fibril inhibition potency and plasma TTR binding selectivity data. Herein, we have successfully employed a substructure combination strategy to use these data to develop potent and selective TTR kinetic stabilizers that rescue cells from the cytotoxic effects of TTR amyloidogenesis. Of the 92 stilbene and dihydrostilbene analogues synthesized, nearly all potently inhibit TTR fibril formation. Seventeen of these exhibit a binding stoichiometry of >1.5 of a maximum of 2 to plasma TTR, while displaying minimal binding to the thyroid hormone receptor (<20%). Six analogues were definitively categorized as kinetic stabilizers by evaluating dissociation time-courses. High-resolution TTR.(kinetic stabilizer)(2) crystal structures (1.31-1.70 A) confirmed the anticipated binding orientation of the 3,5-dibromo-4-hydroxyphenyl substructure and revealed a strong preference of the isosteric 3,5-dibromo-4-aminophenyl substructure to bind to the inner thyroxine binding pocket of TTR.
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Affiliation(s)
- Sungwook Choi
- Department of Chemistry, The Skaggs Institute for Chemical Biology, La Jolla, California 92037, USA
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95
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Abstract
The amyloid hypothesis indicates that protein misfolding is at the root of many neurodegenerative disorders. Small molecules targeting the formation, clearance, aggregation to toxic oligomers or SOD (superoxide dismutase)-like activities of Aβ (amyloid β-peptide) 1–42 have provided encouraging candidates for AD (Alzheimer's disease) medicines in animal models, although none have yet proved to be effective in human trials. We have been investigating approaches to treat systemic amyloidoses, conditions that show common features with some CNS (central nervous system) disorders. For TTR (transthyretin) amyloidosis, we are seeking small molecule compounds that stabilize the amyloidogenic protein and either prevent its structural transition to the crossed β fibres deposited in diseased tissues, or promote its clearance from circulation. Effective stabilizer compounds that simultaneously bind to both thyroxine-binding sites have been developed. A more generic approach involves targeting the plasma glycoprotein SAP (serum amyloid P component). This protein recognizes the misfolded polypeptide structures of amyloid deposits wherever they occur, and acts as a powerful anti-opsonin. We have developed a bivalent drug called CPHPC {(R)-1-[6-[(R)-2-carboxy-pyrrolidin-1-yl]-6-oxo-hexanoyl]-pyrrolidine-2-carboxylic acid} that cross-links pairs of pentameric SAP molecules and causes their rapid elimination from the circulation. This strategy raises the prospect of encouraging natural mechanisms to clear amyloid and recent work suggests that this approach extends to the CNS.
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96
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Santos SD, Fernandes R, Saraiva MJ. The heat shock response modulates transthyretin deposition in the peripheral and autonomic nervous systems. Neurobiol Aging 2010; 31:280-9. [PMID: 18485534 DOI: 10.1016/j.neurobiolaging.2008.04.001] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2007] [Revised: 03/27/2008] [Accepted: 04/01/2008] [Indexed: 11/28/2022]
Abstract
Familial amyloidotic polyneuropathy (FAP) is a neurodegenerative disease that selectively affects the peripheral nervous system. The putative cause of this life threatening pathology is tissue deposition of mutant transthyretin (TTR), initially as non-fibrillar deposits and later as fibrillar material. The mouse models currently available do not recapitulate the human whole features, since the peripheral nervous tissue is spared. We have characterized a new mouse model expressing the human transthyretin V30M in a heat shock transcription factor 1 (Hsf1) null background. The lack of HSF1 expression leads to an extensive and earlier non-fibrillar TTR, evolving into fibrillar material in distinct organs including the peripheral nervous system. Furthermore, inflammatory stress and a reduction in unmyelinated nerve fibers were observed, as in human patients. These results indicate that HSF1 regulated genes are involved in FAP, modulating TTR tissue deposition. The novel mouse model is of the utmost importance in testing new therapeutic strategies and in addressing the influence of the stress response in misfolding diseases.
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Affiliation(s)
- Sofia Duque Santos
- Molecular Neurobiology Unit, Institute for Molecular and Cell Biology - IBMC, 4150-180 Porto, Portugal
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97
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Blay G, Hernández-Olmos V, Pedro JR. Synthesis of (S)-(+)-sotalol and (R)-(−)-isoproterenol via a catalytic enantioselective Henry reaction. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.02.027] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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98
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Connelly S, Choi S, Johnson SM, Kelly JW, Wilson IA. Structure-based design of kinetic stabilizers that ameliorate the transthyretin amyloidoses. Curr Opin Struct Biol 2010; 20:54-62. [PMID: 20133122 DOI: 10.1016/j.sbi.2009.12.009] [Citation(s) in RCA: 143] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2009] [Accepted: 12/20/2009] [Indexed: 10/19/2022]
Abstract
Small molecules that bind to normally unoccupied thyroxine (T(4)) binding sites within transthyretin (TTR) in the blood stabilize the tetrameric ground state of TTR relative to the dissociative transition state and dramatically slow tetramer dissociation, the rate-limiting step for the process of amyloid fibril formation linked to neurodegeneration and cell death. These so-called TTR kinetic stabilizers have been designed using structure-based principles and one of these has recently been shown to halt the progression of a human TTR amyloid disease in a clinical trial, providing the first pharmacologic evidence that the process of amyloid fibril formation is causative. Structure-based design has now progressed to the point where highly selective, high affinity TTR kinetic stabilizers that lack undesirable off-target activities can be produced with high frequency.
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Affiliation(s)
- Stephen Connelly
- Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.
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99
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Kawasaki Y, Chufan EE, Lafont V, Hidaka K, Kiso Y, Amzel LM, Freire E. How much binding affinity can be gained by filling a cavity? Chem Biol Drug Des 2010; 75:143-51. [PMID: 20028396 PMCID: PMC3209665 DOI: 10.1111/j.1747-0285.2009.00921.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Binding affinity optimization is critical during drug development. Here, we evaluate the thermodynamic consequences of filling a binding cavity with functionalities of increasing van der Waals radii (-H, -F, -Cl, and CH(3)) that improve the geometric fit without participating in hydrogen bonding or other specific interactions. We observe a binding affinity increase of two orders of magnitude. There appears to be three phases in the process. The first phase is associated with the formation of stable van der Waals interactions. This phase is characterized by a gain in binding enthalpy and a loss in binding entropy, attributed to a loss of conformational degrees of freedom. For the specific case presented in this article, the enthalpy gain amounts to -1.5 kcal/mol while the entropic losses amount to +0.9 kcal/mol resulting in a net 3.5-fold affinity gain. The second phase is characterized by simultaneous enthalpic and entropic gains. This phase improves the binding affinity 25-fold. The third phase represents the collapse of the trend and is triggered by the introduction of chemical functionalities larger than the binding cavity itself [CH(CH(3))(2)]. It is characterized by large enthalpy and affinity losses. The thermodynamic signatures associated with each phase provide guidelines for lead optimization.
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Affiliation(s)
- Yuko Kawasaki
- Department of Biology, Johns Hopkins University, Baltimore MD 21218
| | - Eduardo E. Chufan
- Department of Biophysics and Biophysical Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD 21205
| | - Virginie Lafont
- Department of Biology, Johns Hopkins University, Baltimore MD 21218
| | - Koushi Hidaka
- Department of Medicinal Chemistry, Center for Frontier Research in Medicinal Science, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8412, Japan
| | - Yoshiaki Kiso
- Department of Medicinal Chemistry, Center for Frontier Research in Medicinal Science, Kyoto Pharmaceutical University, Yamashina-ku, Kyoto 607-8412, Japan
| | - L. Mario Amzel
- Department of Biophysics and Biophysical Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD 21205
| | - Ernesto Freire
- Department of Biology, Johns Hopkins University, Baltimore MD 21218
,Department of Biophysics and Biophysical Chemistry, The Johns Hopkins University School of Medicine, Baltimore, MD 21205
,Corresponding author: Department of Biology, The Johns Hopkins University, 3400 North Charles, Baltimore, MD 21218; Phone: (410) 516-7743, Fax: (410) 516-6469;
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Chemoselective small molecules that covalently modify one lysine in a non-enzyme protein in plasma. Nat Chem Biol 2010; 6:133-9. [PMID: 20081815 DOI: 10.1038/nchembio.281] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2009] [Accepted: 11/10/2009] [Indexed: 12/24/2022]
Abstract
A small molecule that could bind selectively to and then react chemoselectively with a non-enzyme protein in a complex biological fluid, such as blood, could have numerous practical applications. Herein, we report a family of designed stilbenes that selectively and covalently modify the prominent plasma protein transthyretin in preference to more than 4,000 other human plasma proteins. They react chemoselectively with only one of eight lysine e-amino groups within transthyretin. The crystal structure confirms the expected binding orientation of the stilbene substructure and the anticipated conjugating amide bond. These covalent transthyretin kinetic stabilizers exhibit superior amyloid inhibition potency compared to their noncovalent counterparts, and they prevent cytotoxicity associated with amyloidogenesis. Though there are a few prodrugs that, upon metabolic activation, react with a cysteine residue inactivating a specific non-enzyme, we are unaware of designed small molecules that react with one lysine e-amine within a specific non-enzyme protein in a complex biological fluid.
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