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Soya N, Xu H, Roldan A, Yang Z, Ye H, Jiang F, Premchandar A, Veit G, Cole SPC, Kappes J, Hegedus T, Lukacs GL. Folding correctors can restore CFTR posttranslational folding landscape by allosteric domain-domain coupling. bioRxiv 2023:2023.10.19.563107. [PMID: 37905074 PMCID: PMC10614980 DOI: 10.1101/2023.10.19.563107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
The folding/misfolding and pharmacological rescue of multidomain ATP-binding cassette (ABC) C-subfamily transporters, essential for organismal health, remain incompletely understood. The ABCC transporters core consists of two nucleotide binding domains (NBD1,2) and transmembrane domains (TMD1,2). Using molecular dynamic simulations, biochemical and hydrogen deuterium exchange approaches, we show that the mutational uncoupling or stabilization of NBD1-TMD1/2 interfaces can compromise or facilitate the CFTR(ABCC7)-, MRP1(ABCC1)-, and ABCC6-transporters posttranslational coupled domain-folding in the endoplasmic reticulum. Allosteric or orthosteric binding of VX-809 and/or VX-445 folding correctors to TMD1/2 can rescue kinetically trapped CFTR post-translational folding intermediates of cystic fibrosis (CF) mutants of NBD1 or TMD1 by global rewiring inter-domain allosteric-networks. We propose that dynamic allosteric domain-domain communications not only regulate ABCC-transporters function but are indispensable to tune the folding landscape of their post-translational intermediates. These allosteric networks can be compromised by CF-mutations, and reinstated by correctors, offering a framework for mechanistic understanding of ABCC-transporters (mis)folding. One-Sentence Summary Allosteric interdomain communication and its modulation are critical determinants of ABCC-transporters post-translational conformational biogenesis, misfolding, and pharmacological rescue.
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Kammerhofer G, Vegh D, Bányai D, Végh Á, Joob-Fancsaly A, Hermann P, Geczi Z, Hegedus T, Somogyi KS, Bencze B, Biczó Z, Juhász DH, Zaborszky P, Ujpál M, Vaszilkó MT, Németh Z. Association between Hyperglycemia and Medication-Related Osteonecrosis of the Jaw (MRONJ). J Clin Med 2023; 12:jcm12082976. [PMID: 37109314 PMCID: PMC10144577 DOI: 10.3390/jcm12082976] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/12/2023] [Accepted: 04/18/2023] [Indexed: 04/29/2023] Open
Abstract
BACKGROUND Medication-related osteonecrosis of the jaw (MRONJ) is a type of jawbone necrosis caused by the use of drugs for some types of cancer and osteoporosis. The current study aimed to evaluate the associations between hyperglycemia and the development of medication-related osteonecrosis of the jaw. METHODS Our research group investigated data collected between 1 January 2019 and 31 December 2020. A total of 260 patients were selected from the Inpatient Care Unit, Department of Oromaxillofacial Surgery and Stomatology, Semmelweis University. Fasting glucose data were used and included in the study. RESULTS Approximately 40% of the necrosis group and 21% of the control group presented with hyperglycemia. There was a significant association between hyperglycemia and MRONJ (p < 0.05, p = 0.003). Vascular anomaly and immune dysfunction caused by hyperglycemia can lead to necrosis after tooth extraction. Necrosis is more common in the mandible (75.0%) and in the case of parenteral antiresorptive treatment (intravenous Zoledronate and subcutaneous Denosumab). Hyperglycemia is a more relevant risk factor than bad oral habits (26.7%). CONCLUSIONS Ischemia is a complication of abnormal glucose levels, a possible risk factor for necrosis development. Hence, uncontrolled or poorly regulated plasma glucose levels can significantly increase the risk of jawbone necrosis after invasive dental or oral surgical interventions.
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Affiliation(s)
- Gabor Kammerhofer
- Department of Oromaxillofacial Surgery and Stomatology, Semmelweis University, 1088 Budapest, Hungary
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
| | - Daniel Vegh
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
- Department of Prosthodontics, Semmelweis University, 1088 Budapest, Hungary
| | - Dorottya Bányai
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
- Department of Paediatric Dentistry and Orthodontics, Semmelweis University, 1088 Budapest, Hungary
| | - Ádám Végh
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
- Department of Oral Diagnostics, Semmelweis University, 1088 Budapest, Hungary
| | - Arpad Joob-Fancsaly
- Department of Oromaxillofacial Surgery and Stomatology, Semmelweis University, 1088 Budapest, Hungary
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
| | - Peter Hermann
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
- Department of Prosthodontics, Semmelweis University, 1088 Budapest, Hungary
| | - Zoltan Geczi
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
- Department of Prosthodontics, Semmelweis University, 1088 Budapest, Hungary
| | - Tamas Hegedus
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
- Department of Prosthodontics, Semmelweis University, 1088 Budapest, Hungary
| | - Kata Sara Somogyi
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
- Department of Prosthodontics, Semmelweis University, 1088 Budapest, Hungary
| | - Bulcsú Bencze
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
- Department of Prosthodontics, Semmelweis University, 1088 Budapest, Hungary
| | - Zita Biczó
- Department of Oromaxillofacial Surgery and Stomatology, Semmelweis University, 1088 Budapest, Hungary
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
| | - Donát Huba Juhász
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
- Faculty of Dentistry, Semmelweis University, 1088 Budapest, Hungary
| | - Péter Zaborszky
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
- Faculty of Dentistry, Semmelweis University, 1088 Budapest, Hungary
| | - Márta Ujpál
- Department of Oromaxillofacial Surgery and Stomatology, Semmelweis University, 1088 Budapest, Hungary
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
| | - Mihály Tamás Vaszilkó
- Department of Oromaxillofacial Surgery and Stomatology, Semmelweis University, 1088 Budapest, Hungary
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
| | - Zsolt Németh
- Department of Oromaxillofacial Surgery and Stomatology, Semmelweis University, 1088 Budapest, Hungary
- Diabetes-Dental Working Group, Semmelweis University, 1088 Budapest, Hungary
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Varadi M, Nair S, Sillitoe I, Tauriello G, Anyango S, Bienert S, Borges C, Deshpande M, Green T, Hassabis D, Hatos A, Hegedus T, Hekkelman ML, Joosten R, Jumper J, Laydon A, Molodenskiy D, Piovesan D, Salladini E, Salzberg SL, Sommer MJ, Steinegger M, Suhajda E, Svergun D, Tenorio-Ku L, Tosatto S, Tunyasuvunakool K, Waterhouse AM, Žídek A, Schwede T, Orengo C, Velankar S. 3D-Beacons: decreasing the gap between protein sequences and structures through a federated network of protein structure data resources. Gigascience 2022; 11:6854872. [PMID: 36448847 PMCID: PMC9709962 DOI: 10.1093/gigascience/giac118] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Revised: 09/20/2022] [Accepted: 11/11/2022] [Indexed: 12/02/2022] Open
Abstract
While scientists can often infer the biological function of proteins from their 3-dimensional quaternary structures, the gap between the number of known protein sequences and their experimentally determined structures keeps increasing. A potential solution to this problem is presented by ever more sophisticated computational protein modeling approaches. While often powerful on their own, most methods have strengths and weaknesses. Therefore, it benefits researchers to examine models from various model providers and perform comparative analysis to identify what models can best address their specific use cases. To make data from a large array of model providers more easily accessible to the broader scientific community, we established 3D-Beacons, a collaborative initiative to create a federated network with unified data access mechanisms. The 3D-Beacons Network allows researchers to collate coordinate files and metadata for experimentally determined and theoretical protein models from state-of-the-art and specialist model providers and also from the Protein Data Bank.
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Affiliation(s)
- Mihaly Varadi
- Correspondence address. Mihaly Varadi, PDBe team, Wellcome Trust Genome Campus, Saffron Walden CB10 1SA, UK. E-mail:
| | | | | | | | - Stephen Anyango
- European Molecular Biology Laboratory, European Bioinformatics Institute, Hinxton CB10 1SA, UK
| | - Stefan Bienert
- Biozentrum, University of Basel, Basel 4056, Switzerland,Computational Structural Biology, SIB Swiss Institute of Bioinformatics, Basel 4056, Switzerland
| | - Clemente Borges
- Computational Structural Biology, SIB Swiss Institute of Bioinformatics, Basel 4056, Switzerland,European Molecular Biology Laboratory, EMBL Hamburg, Hamburg 69117, Germany
| | - Mandar Deshpande
- European Molecular Biology Laboratory, European Bioinformatics Institute, Hinxton CB10 1SA, UK
| | | | | | - Andras Hatos
- Department of Biomedical Sciences, University of Padova, Padova 35129, Italy,Department of Oncology, Lausanne University Hospital, Lausanne 1015, Switzerland,Department of Computational Biology, University of Lausanne, Lausanne 1015, Switzerland,Swiss Institute of Bioinformatics, Lausanne 1015, Switzerland,Swiss Cancer Center Leman, Lausanne 1005, Switzerland
| | - Tamas Hegedus
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest 1094, Hungary
| | | | - Robbie Joosten
- Netherlands Cancer Institute, Amsterdam 1066 CX, The Netherlands
| | | | | | - Dmitry Molodenskiy
- Computational Structural Biology, SIB Swiss Institute of Bioinformatics, Basel 4056, Switzerland,European Molecular Biology Laboratory, EMBL Hamburg, Hamburg 69117, Germany
| | - Damiano Piovesan
- Department of Biomedical Sciences, University of Padova, Padova 35129, Italy
| | - Edoardo Salladini
- Department of Biomedical Sciences, University of Padova, Padova 35129, Italy
| | - Steven L Salzberg
- Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Markus J Sommer
- Biomedical Engineering, Johns Hopkins University, Baltimore, MD 21205, USA
| | - Martin Steinegger
- School of Biology, Seoul National University, Seoul 82-2-880-6971, 6977, South Korea
| | - Erzsebet Suhajda
- Department of Biophysics and Radiation Biology, Semmelweis University, Budapest 1094, Hungary
| | - Dmitri Svergun
- Computational Structural Biology, SIB Swiss Institute of Bioinformatics, Basel 4056, Switzerland,European Molecular Biology Laboratory, EMBL Hamburg, Hamburg 69117, Germany
| | - Luiggi Tenorio-Ku
- Department of Biomedical Sciences, University of Padova, Padova 35129, Italy
| | - Silvio Tosatto
- Department of Biomedical Sciences, University of Padova, Padova 35129, Italy
| | | | - Andrew Mark Waterhouse
- Biozentrum, University of Basel, Basel 4056, Switzerland,Computational Structural Biology, SIB Swiss Institute of Bioinformatics, Basel 4056, Switzerland
| | | | - Torsten Schwede
- Biozentrum, University of Basel, Basel 4056, Switzerland,Computational Structural Biology, SIB Swiss Institute of Bioinformatics, Basel 4056, Switzerland
| | - Christine Orengo
- Department of Structural and Molecular Biology, UCL, London WC1E 6BT, UK
| | - Sameer Velankar
- European Molecular Biology Laboratory, European Bioinformatics Institute, Hinxton CB10 1SA, UK
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4
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Tordai H, Suhajda E, Sillitoe I, Nair S, Varadi M, Hegedus T. Comprehensive Collection and Prediction of ABC Transmembrane Protein Structures in the AI Era of Structural Biology. Int J Mol Sci 2022; 23:ijms23168877. [PMID: 36012140 PMCID: PMC9408558 DOI: 10.3390/ijms23168877] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 08/05/2022] [Accepted: 08/07/2022] [Indexed: 02/06/2023] Open
Abstract
The number of unique transmembrane (TM) protein structures doubled in the last four years, which can be attributed to the revolution of cryo-electron microscopy. In addition, AlphaFold2 (AF2) also provided a large number of predicted structures with high quality. However, if a specific protein family is the subject of a study, collecting the structures of the family members is highly challenging in spite of existing general and protein domain-specific databases. Here, we demonstrate this and assess the applicability and usability of automatic collection and presentation of protein structures via the ABC protein superfamily. Our pipeline identifies and classifies transmembrane ABC protein structures using the PFAM search and also aims to determine their conformational states based on special geometric measures, conftors. Since the AlphaFold database contains structure predictions only for single polypeptide chains, we performed AF2-Multimer predictions for human ABC half transporters functioning as dimers. Our AF2 predictions warn of possibly ambiguous interpretation of some biochemical data regarding interaction partners and call for further experiments and experimental structure determination. We made our predicted ABC protein structures available through a web application, and we joined the 3D-Beacons Network to reach the broader scientific community through platforms such as PDBe-KB.
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Affiliation(s)
- Hedvig Tordai
- Department of Biophysics and Radiation Biology, Semmelweis University, 1085 Budapest, Hungary
| | - Erzsebet Suhajda
- Department of Biophysics and Radiation Biology, Semmelweis University, 1085 Budapest, Hungary
- Faculty of Electrical Engineering and Informatics, Budapest University of Technology and Economics, 1111 Budapest, Hungary
- Wigner Research Centre for Physics, 1121 Budapest, Hungary
| | - Ian Sillitoe
- Department of Structural and Molecular Biology, University College London, London WC1E 6BT, UK
| | - Sreenath Nair
- European Bioinformatics Institute, European Molecular Biology Laboratory, Hinxton CB10 1SD, UK
| | - Mihaly Varadi
- European Bioinformatics Institute, European Molecular Biology Laboratory, Hinxton CB10 1SD, UK
| | - Tamas Hegedus
- Department of Biophysics and Radiation Biology, Semmelweis University, 1085 Budapest, Hungary
- ELKH-SE Biophysical Virology Research Group, Eötvös Loránd Research Network, 1052 Budapest, Hungary
- Correspondence:
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5
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Hegedus T, Kreuter P, Kismarczi-Antalffy AA, Demeter T, Banyai D, Vegh A, Geczi Z, Hermann P, Payer M, Zsembery A, Al-Hassiny A, Mukaddam K, Herber V, Jakse N, Vegh D. User Experience and Sustainability of 3D Printing in Dentistry. Int J Environ Res Public Health 2022; 19:ijerph19041921. [PMID: 35206116 PMCID: PMC8872260 DOI: 10.3390/ijerph19041921] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 01/30/2022] [Accepted: 02/03/2022] [Indexed: 02/04/2023]
Abstract
BACKGROUND 3D printing is a rapidly developing technology in the healthcare industry and in dentistry. Its application clearly shows that this area of digital dentistry has potential for everyday usage across all fields, including prosthodontics, orthodontics, maxillofacial surgery, and oral implantology. However, despite gaining ground, there is a lack of information about how specialists (dentists and dental technicians) use additive technology. Our research group aimed to investigate the impact of social media on additive manufacturing technology among dental specialists and their everyday usage of 3D printing. METHODS This paper investigated specialists' everyday usage of 3D printers via an online survey (Google Forms). The survey questions aimed to discover the number of 3D printers used, the accessibility of the devices, the annual cost, and the design programs. Since specialists tend to build online communities on social media, we circulated our study questionnaire using our profiles on LinkedIn, Facebook, and Instagram platforms during our research. RESULTS A total of 120 responses were received from 20 countries, with the most significant numbers being from Hungary 23.7% (n = 27), the United States 18.4% (n = 21), and the United Kingdom 7.9% (n = 9). Most of the participants were dentists (n = 68) or dental technicians (n = 29), but some CAD/CAM specialists (n = 23) also completed our survey. The participants had an average of 3.8 years (±0.7) of experience in the 3D printing field, and owned a total of 405 printing devices (3.6 on average/person). CONCLUSIONS The impact of social media on this research field is growing increasingly. Hence, we support specialists in joining virtual communities on professional platforms. This article intended to provide a practical overview, feedback, and direction for dentists interested in 3D printing technology. From our survey, we can conclude that additive technology is broadening dental applications and the services that we can provide for our patients.
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Affiliation(s)
- Tamas Hegedus
- Department of Prosthodontics, Semmelweis University, Szentkiralyi utca 47., 1088 Budapest, Hungary; (T.H.); (Z.G.); (P.H.)
| | - Patrik Kreuter
- Faculty of Dentistry, Semmelweis University, Szentkiralyi utca 47., 1088 Budapest, Hungary; (P.K.); (A.A.K.-A.)
| | | | - Tamas Demeter
- Department of General Dental Preclinical Practice, Semmelweis University, Szentkiralyi utca 47., 1088 Budapest, Hungary;
| | - Dorottya Banyai
- Department of Pediatric Dentistry and Orthodontics, Semmelweis University, Szentkiralyi utca 47., 1088 Budapest, Hungary;
| | - Adam Vegh
- Department of Maxillofacial Surgery and Dentistry, Semmelweis University, Maria utca 52., 1088 Budapest, Hungary;
| | - Zoltan Geczi
- Department of Prosthodontics, Semmelweis University, Szentkiralyi utca 47., 1088 Budapest, Hungary; (T.H.); (Z.G.); (P.H.)
| | - Peter Hermann
- Department of Prosthodontics, Semmelweis University, Szentkiralyi utca 47., 1088 Budapest, Hungary; (T.H.); (Z.G.); (P.H.)
| | - Michael Payer
- Division of Oral Surgery and Orthodontics, Department of Dental Medicine and Oral Health, School of Dentistry, Medical University Graz, Billrothgasse 4, 8010 Graz, Austria; (M.P.); (V.H.); (N.J.)
| | - Akos Zsembery
- Department of Oral Biology, Semmelweis University, Nagyvárad tér 4., 1089 Budapest, Hungary;
| | - Ahmad Al-Hassiny
- Institute of Digital Dentistry, 9 Hillary Court, Lower Hutt, Wellington 5010, New Zealand;
| | - Khaled Mukaddam
- Department of Oral Surgery, University Center for Dental Medicine Basel (UZB), University of Basel, Mattenstrasse 40, 4058 Basel, Switzerland;
| | - Valentin Herber
- Division of Oral Surgery and Orthodontics, Department of Dental Medicine and Oral Health, School of Dentistry, Medical University Graz, Billrothgasse 4, 8010 Graz, Austria; (M.P.); (V.H.); (N.J.)
| | - Norbert Jakse
- Division of Oral Surgery and Orthodontics, Department of Dental Medicine and Oral Health, School of Dentistry, Medical University Graz, Billrothgasse 4, 8010 Graz, Austria; (M.P.); (V.H.); (N.J.)
| | - Daniel Vegh
- Department of Prosthodontics, Semmelweis University, Szentkiralyi utca 47., 1088 Budapest, Hungary; (T.H.); (Z.G.); (P.H.)
- Division of Oral Surgery and Orthodontics, Department of Dental Medicine and Oral Health, School of Dentistry, Medical University Graz, Billrothgasse 4, 8010 Graz, Austria; (M.P.); (V.H.); (N.J.)
- Correspondence: ; Tel.: +36-30-7405164
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6
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Macalou S, Robey RW, Jabor Gozzi G, Shukla S, Grosjean I, Hegedus T, Ambudkar SV, Bates SE, Di Pietro A. The linker region of breast cancer resistance protein ABCG2 is critical for coupling of ATP-dependent drug transport. Cell Mol Life Sci 2015; 73:1927-37. [PMID: 26708291 DOI: 10.1007/s00018-015-2118-5] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 11/21/2015] [Accepted: 12/14/2015] [Indexed: 10/22/2022]
Abstract
The ATP-binding cassette (ABC) transporters of class G display a different domain organisation than P-glycoprotein/ABCB1 and bacterial homologues with a nucleotide-binding domain preceding the transmembrane domain. The linker region connecting these domains is unique and its function and structure cannot be predicted. Sequence analysis revealed that the human ABCG2 linker contains a LSGGE sequence, homologous to the canonical C-motif/ABC signature present in all ABC nucleotide-binding domains. Predictions of disorder and of secondary structures indicated that this C2-sequence was highly mobile and located between an α-helix and a loop similarly to the C-motif. Point mutations of the two first residues of the C2-sequence fully abolished the transport-coupled ATPase activity, and led to the complete loss of cell resistance to mitoxantrone. The interaction with potent, selective and non-competitive, ABCG2 inhibitors was also significantly altered upon mutation. These results suggest an important mechanistic role for the C2-sequence of the ABCG2 linker region in ATP binding and/or hydrolysis coupled to drug efflux.
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Affiliation(s)
- S Macalou
- Equipe Labellisée Ligue 2014, BMSSI, UMR 5086 CNRS, Université Lyon 1, IBCP, 69007, Lyon, France
| | - R W Robey
- Medical Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - G Jabor Gozzi
- Equipe Labellisée Ligue 2014, BMSSI, UMR 5086 CNRS, Université Lyon 1, IBCP, 69007, Lyon, France
| | - S Shukla
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - I Grosjean
- CelluloNet Biobank BB-0033-00072 Facility of UMS3444/US8/SFR Biosciences, IBCP, 69007, Lyon, France
| | - T Hegedus
- MTA-SE Molecular Biophysics Research Group, Hungarian Academy of Sciences and Department of Biophysics and Radiation Biology, Semmelweis University, Budapest, Hungary
| | - S V Ambudkar
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - S E Bates
- Medical Oncology Branch, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - A Di Pietro
- Equipe Labellisée Ligue 2014, BMSSI, UMR 5086 CNRS, Université Lyon 1, IBCP, 69007, Lyon, France.
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7
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Veit G, Avramescu RG, Perdomo D, Phuan PW, Bagdany M, Apaja PM, Borot F, Szollosi D, Wu YS, Finkbeiner WE, Hegedus T, Verkman AS, Lukacs GL. Some gating potentiators, including VX-770, diminish ΔF508-CFTR functional expression. Sci Transl Med 2015; 6:246ra97. [PMID: 25101887 DOI: 10.1126/scitranslmed.3008889] [Citation(s) in RCA: 240] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Cystic fibrosis (CF) is caused by mutations in the CF transmembrane regulator (CFTR) that result in reduced anion conductance at the apical membrane of secretory epithelia. Treatment of CF patients carrying the G551D gating mutation with the potentiator VX-770 (ivacaftor) largely restores channel activity and has shown substantial clinical benefit. However, most CF patients carry the ΔF508 mutation, which impairs CFTR folding, processing, function, and stability. Studies in homozygous ΔF508 CF patients indicated little clinical benefit of monotherapy with the investigational corrector VX-809 (lumacaftor) or VX-770, whereas combination clinical trials show limited but significant improvements in lung function. We show that VX-770, as well as most other potentiators, reduces the correction efficacy of VX-809 and another investigational corrector, VX-661. To mimic the administration of VX-770 alone or in combination with VX-809, we examined its long-term effect in immortalized and primary human respiratory epithelia. VX-770 diminished the folding efficiency and the metabolic stability of ΔF508-CFTR at the endoplasmic reticulum (ER) and post-ER compartments, respectively, causing reduced cell surface ΔF508-CFTR density and function. VX-770-induced destabilization of ΔF508-CFTR was influenced by second-site suppressor mutations of the folding defect and was prevented by stabilization of the nucleotide-binding domain 1 (NBD1)-NBD2 interface. The reduced correction efficiency of ΔF508-CFTR, as well as of two other processing mutations in the presence of VX-770, suggests the need for further optimization of potentiators to maximize the clinical benefit of corrector-potentiator combination therapy in CF.
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Affiliation(s)
- Guido Veit
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Radu G Avramescu
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Doranda Perdomo
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Puay-Wah Phuan
- Departments of Medicine and Physiology, University of California, San Francisco, San Francisco, CA 94143-0521, USA
| | - Miklos Bagdany
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Pirjo M Apaja
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Florence Borot
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Daniel Szollosi
- MTA-SE Molecular Biophysics Research Group, Hungarian Academy of Sciences, 1444 Budapest, Hungary. Department of Biophysics and Radiation Biology, Semmelweis University, 1444 Budapest P.O. Box 263, Hungary
| | - Yu-Sheng Wu
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada
| | - Walter E Finkbeiner
- Department of Pathology, University of California, San Francisco, San Francisco, CA 94143-0511, USA
| | - Tamas Hegedus
- MTA-SE Molecular Biophysics Research Group, Hungarian Academy of Sciences, 1444 Budapest, Hungary. Department of Biophysics and Radiation Biology, Semmelweis University, 1444 Budapest P.O. Box 263, Hungary
| | - Alan S Verkman
- Departments of Medicine and Physiology, University of California, San Francisco, San Francisco, CA 94143-0521, USA
| | - Gergely L Lukacs
- Department of Physiology, McGill University, Montréal, Quebec H3G 1Y6, Canada. Department of Biochemistry, McGill University, Montréal, Quebec H3G 1Y6, Canada. Groupe de Recherche Axé sur la Structure des Protéines (GRASP), McGill University, Montréal, Quebec H3G 1Y6, Canada.
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8
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Serohijos AWR, Hegedus T, Aleksandrov A, He L, Cui L, Riordan JR, Dokholyan NV. Phenylalanine 508 forms an intra‐domain contact crucial to CFTR folding and dynamics. FASEB J 2009. [DOI: 10.1096/fasebj.23.1_supplement.698.7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - Tamas Hegedus
- Biochemistry and Biophysics Department
- Cystic Fibrosis Center
| | - Andrei Aleksandrov
- Cystic Fibrosis Center
- Biomedical EngineeringUniversity of North CarolinaChapel HillNC
| | - Lihua He
- Biochemistry and Biophysics Department
- Cystic Fibrosis Center
| | - Liying Cui
- Biochemistry and Biophysics Department
- Cystic Fibrosis Center
| | - John R Riordan
- Biochemistry and Biophysics Department
- Cystic Fibrosis Center
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Cui L, Aleksandrov L, Chang XB, Hou YX, He L, Hegedus T, Gentzsch M, Aleksandrov A, Balch WE, Riordan JR. Domain interdependence in the biosynthetic assembly of CFTR. J Mol Biol 2006; 365:981-94. [PMID: 17113596 DOI: 10.1016/j.jmb.2006.10.086] [Citation(s) in RCA: 170] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2006] [Revised: 10/23/2006] [Accepted: 10/25/2006] [Indexed: 01/23/2023]
Abstract
The dimerization of their two nucleotide binding domains (NBDs) in a so-called "nucleotide-sandwich" is the hallmark of ATP cassette binding (ABC) proteins and the basis of their catalytic activities. The major disease-causing mutation in the cystic fibrosis transmembrane conductance regulator (CFTR or ABCC7), deletion of Phe508 in NBD1, does not grossly alter the structure of that domain but prevents conformational maturation of the whole CFTR protein, possibly by disrupting the native interaction between NBD1 and NBD2. However, the role of inter-domain interactions in CFTR folding has been brought into question by a recent report that all CFTR domains fold independently. Here we show that in addition to domain folding, correct inter-domain assembly is essential to form a stable unit that satisfies endoplasmic reticulum (ER) quality control. N-terminal domains depend on their more C-terminal neighbors, most essentially the second membrane-spanning domain (MSD2) but significantly, not NBD2. Wild-type C-terminal truncation constructs, completely devoid of NBD2 are transported out of the ER and to the cell surface where they form characteristic CFTR chloride channels with low open probability. The DeltaNBD2 wild-type protein matures and has similar stability as its full-length counterpart. Therefore, the catalytically crucial inter-NBD associations are not required to satisfy ER quality control mechanisms. The DeltaF508 mutation arrests the maturation of DeltaNBD2 just as it does full-length CFTR, indicating that DeltaF508 perturbs other portions of the molecule in addition to NBD2. We find that the mutation prevents formation of a compact MSD1, reflected in its susceptibility to protease digestion. This perturbation of MSD1 may in turn prevent its normal integration with MSD2. The dispensability of NBD2 in the folding of more N-terminal domains stands in contrast to the known hypersensitivity to proteolysis of NBD2 in the DeltaF508 protein.
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Affiliation(s)
- Liying Cui
- Dept of Biochemistry and Biophysics and Cystic Fibrosis Center, University of North Carolina at Chapel Hill, NC 27599, USA
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Remenyi J, Hegedus T, Sarkadi B, Toth S, Falus A, Gaal D, Hudecz F. Daunomycin-polypetide conjugates: in vitro antitumor effect in sensitive and multidrug resistant cell lines. Eur J Cancer 2001. [DOI: 10.1016/s0959-8049(01)80725-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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