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Frigon L, Pascal JM. Structural and biochemical analysis of the PARP1-homology region of PARP4/vault PARP. Nucleic Acids Res 2023; 51:12492-12507. [PMID: 37971310 PMCID: PMC10711553 DOI: 10.1093/nar/gkad1064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Revised: 09/19/2023] [Accepted: 10/30/2023] [Indexed: 11/19/2023] Open
Abstract
PARP4 is an ADP-ribosyltransferase that resides within the vault ribonucleoprotein organelle. Our knowledge of PARP4 structure and biochemistry is limited relative to other PARPs. PARP4 shares a region of homology with PARP1, an ADP-ribosyltransferase that produces poly(ADP-ribose) from NAD+ in response to binding DNA breaks. The PARP1-homology region of PARP4 includes a BRCT fold, a WGR domain, and the catalytic (CAT) domain. Here, we have determined X-ray structures of the PARP4 catalytic domain and performed biochemical analysis that together indicate an active site that is open to NAD+ interaction, in contrast to the closed conformation of the PARP1 catalytic domain that blocks access to substrate NAD+. We have also determined crystal structures of the minimal ADP-ribosyltransferase fold of PARP4 that illustrate active site alterations that restrict PARP4 to mono(ADP-ribose) rather than poly(ADP-ribose) modifications. We demonstrate that PARP4 interacts with vault RNA, and that the BRCT is primarily responsible for the interaction. However, the interaction does not lead to stimulation of mono(ADP-ribosylation) activity. The BRCT-WGR-CAT of PARP4 has lower activity than the CAT alone, suggesting that the BRCT and WGR domains regulate catalytic output. Our study provides first insights into PARP4 structure and regulation and expands understanding of PARP structural biochemistry.
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Affiliation(s)
- Léonie Frigon
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Qc H3T 1J4, Canada
| | - John M Pascal
- Department of Biochemistry and Molecular Medicine, Université de Montréal, Montréal, Qc H3T 1J4, Canada
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Lovsund T, Mashayekhi F, Fitieh A, Stafford J, Ismail IH. Unravelling the Role of PARP1 in Homeostasis and Tumorigenesis: Implications for Anti-Cancer Therapies and Overcoming Resistance. Cells 2023; 12:1904. [PMID: 37508568 PMCID: PMC10378431 DOI: 10.3390/cells12141904] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Revised: 07/14/2023] [Accepted: 07/18/2023] [Indexed: 07/30/2023] Open
Abstract
Detailing the connection between homeostatic functions of enzymatic families and eventual progression into tumorigenesis is crucial to our understanding of anti-cancer therapies. One key enzyme group involved in this process is the Poly (ADP-ribose) polymerase (PARP) family, responsible for an expansive number of cellular functions, featuring members well established as regulators of DNA repair, genomic stability and beyond. Several PARP inhibitors (PARPi) have been approved for clinical use in a range of cancers, with many more still in trials. Unfortunately, the occurrence of resistance to PARPi therapy is growing in prevalence and requires the introduction of novel counter-resistance mechanisms to maintain efficacy. In this review, we summarize the updated understanding of the vast homeostatic functions the PARP family mediates and pin the importance of PARPi therapies as anti-cancer agents while discussing resistance mechanisms and current up-and-coming counter-strategies for countering such resistance.
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Affiliation(s)
- Taylor Lovsund
- Division of Experimental Oncology, Department of Oncology, Faculty of Medicine & Dentistry, University of Alberta, 11560 University Avenue, Edmonton, AB T6G 1Z2, Canada
| | - Fatemeh Mashayekhi
- Division of Experimental Oncology, Department of Oncology, Faculty of Medicine & Dentistry, University of Alberta, 11560 University Avenue, Edmonton, AB T6G 1Z2, Canada
| | - Amira Fitieh
- Department of Biophysics, Faculty of Science, Cairo University, Giza 12613, Egypt
| | - James Stafford
- Department of Biological Sciences, Faculty of Science, University of Alberta, Edmonton, AB T6G 2E1, Canada
| | - Ismail Hassan Ismail
- Division of Experimental Oncology, Department of Oncology, Faculty of Medicine & Dentistry, University of Alberta, 11560 University Avenue, Edmonton, AB T6G 1Z2, Canada
- Department of Biophysics, Faculty of Science, Cairo University, Giza 12613, Egypt
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3
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Abstract
Major advances have recently defined functions for human mono-ADP-ribosylating PARP enzymes (mono-ARTs), also opening up potential applications for targeting them to treat diseases. Structural biology combined with medicinal chemistry has allowed the design of potent small molecule inhibitors which typically bind to the catalytic domain. Most of these inhibitors are at the early stages, but some have already a suitable profile to be used as chemical tools. One compound targeting PARP7 has even progressed to clinical trials. In this review, we collect inhibitors of mono-ARTs with a typical "H-Y-Φ" motif (Φ = hydrophobic residue) and focus on compounds that have been reported as active against one or a restricted number of enzymes. We discuss them from a medicinal chemistry point of view and include an analysis of the available crystal structures, allowing us to craft a pharmacophore model that lays the foundation for obtaining new potent and more specific inhibitors.
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Affiliation(s)
- Maria
Giulia Nizi
- Department
of Pharmaceutical Sciences, University of
Perugia, 06123 Perugia, Italy
| | - Mirko M. Maksimainen
- Faculty
of Biochemistry and Molecular Medicine & Biocenter Oulu, University of Oulu, 5400 Oulu, Finland
| | - Lari Lehtiö
- Faculty
of Biochemistry and Molecular Medicine & Biocenter Oulu, University of Oulu, 5400 Oulu, Finland
| | - Oriana Tabarrini
- Department
of Pharmaceutical Sciences, University of
Perugia, 06123 Perugia, Italy
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4
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Gan Y, Sha H, Zou R, Xu M, Zhang Y, Feng J, Wu J. Research Progress on Mono-ADP-Ribosyltransferases in Human Cell Biology. Front Cell Dev Biol 2022; 10:864101. [PMID: 35652091 PMCID: PMC9149570 DOI: 10.3389/fcell.2022.864101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2022] [Accepted: 03/28/2022] [Indexed: 11/13/2022] Open
Abstract
ADP-ribosylation is a well-established post-translational modification that is inherently connected to diverse processes, including DNA repair, transcription, and cell signaling. The crucial roles of mono-ADP-ribosyltransferases (mono-ARTs) in biological processes have been identified in recent years by the comprehensive use of genetic engineering, chemical genetics, and proteomics. This review provides an update on current methodological advances in the study of these modifiers. Furthermore, the review provides details on the function of mono ADP-ribosylation. Several mono-ARTs have been implicated in the development of cancer, and this review discusses the role and therapeutic potential of some mono-ARTs in cancer.
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Affiliation(s)
- Yujie Gan
- Jiangsu Cancer Hospital, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing, China
- Nanjing Medical University, Nanjing, China
| | - Huanhuan Sha
- Jiangsu Cancer Hospital, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing, China
| | - Renrui Zou
- Jiangsu Cancer Hospital, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing, China
- Nanjing Medical University, Nanjing, China
| | - Miao Xu
- Nanjing Medical University, Nanjing, China
| | - Yuan Zhang
- Jiangsu Cancer Hospital, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing, China
| | - Jifeng Feng
- Jiangsu Cancer Hospital, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing, China
- Nanjing Medical University, Nanjing, China
- *Correspondence: Jifeng Feng,
| | - Jianzhong Wu
- Jiangsu Cancer Hospital, Nanjing Medical University Affiliated Cancer Hospital, Jiangsu Institute of Cancer Research, Nanjing, China
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5
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Richard IA, Burgess JT, O'Byrne KJ, Bolderson E. Beyond PARP1: The Potential of Other Members of the Poly (ADP-Ribose) Polymerase Family in DNA Repair and Cancer Therapeutics. Front Cell Dev Biol 2022; 9:801200. [PMID: 35096828 PMCID: PMC8795897 DOI: 10.3389/fcell.2021.801200] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 12/21/2021] [Indexed: 01/22/2023] Open
Abstract
The proteins within the Poly-ADP Ribose Polymerase (PARP) family encompass a diverse and integral set of cellular functions. PARP1 and PARP2 have been extensively studied for their roles in DNA repair and as targets for cancer therapeutics. Several PARP inhibitors (PARPi) have been approved for clinical use, however, while their efficacy is promising, tumours readily develop PARPi resistance. Many other members of the PARP protein family share catalytic domain homology with PARP1/2, however, these proteins are comparatively understudied, particularly in the context of DNA damage repair and tumourigenesis. This review explores the functions of PARP4,6-16 and discusses the current knowledge of the potential roles these proteins may play in DNA damage repair and as targets for cancer therapeutics.
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Affiliation(s)
- Iain A Richard
- Cancer and Ageing Research Program (CARP), Centre for Genomics and Personalised Health (CGPH), Queensland University of Technology (QUT), Brisbane, QLD, Australia
| | - Joshua T Burgess
- Cancer and Ageing Research Program (CARP), Centre for Genomics and Personalised Health (CGPH), Queensland University of Technology (QUT), Brisbane, QLD, Australia
| | - Kenneth J O'Byrne
- Cancer and Ageing Research Program (CARP), Centre for Genomics and Personalised Health (CGPH), Queensland University of Technology (QUT), Brisbane, QLD, Australia.,Princess Alexandra Hospital, Brisbane, QLD, Australia
| | - Emma Bolderson
- Cancer and Ageing Research Program (CARP), Centre for Genomics and Personalised Health (CGPH), Queensland University of Technology (QUT), Brisbane, QLD, Australia
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