1
|
Fei X, Chen L, Gao J, Jiang X, Sun W, Cheng X, Zhao T, Zhao M, Zhu L. p53 lysine-lactylated modification contributes to lipopolysaccharide-induced proinflammatory activation in BV2 cell under hypoxic conditions. Neurochem Int 2024; 178:105794. [PMID: 38908518 DOI: 10.1016/j.neuint.2024.105794] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Revised: 06/16/2024] [Accepted: 06/18/2024] [Indexed: 06/24/2024]
Abstract
p53 has diversity functions in regulation of transcription, cell proliferation, cancer metastasis, etc. Recent studies have shown that p53 and nuclear factor-κB (NF-κB) co-regulate proinflammatory responses in macrophages. However, the role of p53 lysine lactylation (p53Kla) in mediating proinflammatory phenotypes in microglia under hypoxic conditions remains unclear. In the current study, we investigated the proinflammatory activation exacerbated by hypoxia and the levels of p53Kla in microglial cells. BV2 cells, an immortalized mouse microglia cell line, were divided into control, lipopolysaccharide (LPS)-induced, hypoxia (Hy), and LPS-Hy groups. The protein expression levels of p53 and p53Kla and the activation of microglia were compared among the four groups. Sodium oxamate and mutant p53 plasmids were transfected into BV2 cells to detect the effect of p53Kla on microglial proinflammatory activation. LPS-Hy stimulation significantly upregulated p53Kla levels in both the nucleus and the cytoplasm of BV2 cells. In contrast, the p53 protein levels were downregulated. LPS-Hy stimulation upregulated phosphorylated p65 protein levels in nuclear and activated the NF-κB pathway in BV2 cells, resulting in increased expression of pro-inflammatory cytokines (iNOS, IL6, IL1β, TNFα), enhanced cell viability, and concomitantly, increased cytotoxicity. In conclusion, p53 lysine-lactylated modification contributes to LPS-induced proinflammatory activation in BV2 cells under hypoxia through NF-κB pathway and inhibition of lactate production may alleviate neuroinflammatory injury.
Collapse
Affiliation(s)
- Xuechao Fei
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Lu Chen
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China; Hengyang Medical School, University of South China, Hunan, 421001, China
| | - Jiayue Gao
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Xiufang Jiang
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Wen Sun
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Xiang Cheng
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Tong Zhao
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China
| | - Ming Zhao
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China.
| | - Lingling Zhu
- Beijing Institute of Basic Medical Sciences, Beijing, 100850, China; Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, 226019, China; Hengyang Medical School, University of South China, Hunan, 421001, China.
| |
Collapse
|
2
|
Kesel AJ. Novel Antineoplastic Inducers of Mitochondrial Apoptosis in Human Cancer Cells. Molecules 2024; 29:914. [PMID: 38398665 PMCID: PMC10892984 DOI: 10.3390/molecules29040914] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 02/11/2024] [Accepted: 02/14/2024] [Indexed: 02/25/2024] Open
Abstract
I propose a new strategy to suppress human cancer completely with two entirely new drug compounds exploiting cancer's Warburg effect characterized by a defective mitochondrial aerobic respiration, substituted by cytosolic aerobic fermentation/glycolysis of D-(+)-glucose into L-(+)-lactic acid. The two essentially new drugs, compound 1 [P(op)T(est)162] and compound 3 (PT167), represent new highly symmetric, four-bladed propeller-shaped polyammonium cations. The in vitro antineoplastic highly efficacious drug compound 3 represents a covalent combination of compound 1 and compound 2 (PT166). The intermediate drug compound 2 is an entirely new colchic(in)oid derivative synthesized from colchicine. Compound 2's structure was determined using X-ray crystallography. Compound 1 and compound 3 were active in vitro versus 60 human cancer cell lines of the National Cancer Institute (NCI) Developmental Therapeutics Program (DTP) 60-cancer cell testing. Compound 1 and compound 3 not only stop the growth of cancer cells to ±0% (cancerostatic effect) but completely kill nearly all 60 cancer cells to a level of almost -100% (tumoricidal effect). Compound 1 and compound 3 induce mitochondrial apoptosis (under cytochrome c release) in all cancer cells tested by (re)activating (in most cancers impaired) p53 function, which results in a decrease in cancer's dysregulated cyclin D1 and an induction of the cell cycle-halting cyclin-dependent kinase inhibitor p21Waf1/p21Cip1.
Collapse
Affiliation(s)
- Andreas J Kesel
- Independent Researcher, Chammünsterstr. 47, D-81827 München, Bavaria, Germany
| |
Collapse
|
3
|
Sakaguchi S, Nakagawa N, Wahba HM, Wada J, Kamada R, Omichinski JG, Sakaguchi K. Highly Similar Tetramerization Domains from the p53 Protein of Different Mammalian Species Possess Varying Biophysical, Functional and Structural Properties. Int J Mol Sci 2023; 24:16620. [PMID: 38068946 PMCID: PMC10706167 DOI: 10.3390/ijms242316620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2023] [Revised: 11/17/2023] [Accepted: 11/20/2023] [Indexed: 12/18/2023] Open
Abstract
The p53 protein is a transcriptional regulatory factor and many of its functions require that it forms a tetrameric structure. Although the tetramerization domain of mammalian p53 proteins (p53TD) share significant sequence similarities, it was recently shown that the tree shrew p53TD is considerably more thermostable than the human p53TD. To determine whether other mammalian species display differences in this domain, we used biophysical, functional, and structural studies to compare the properties of the p53TDs from six mammalian model organisms (human, tree shrew, guinea pig, Chinese hamster, sheep, and opossum). The results indicate that the p53TD from the opossum and tree shrew are significantly more stable than the human p53TD, and there is a correlation between the thermostability of the p53TDs and their ability to activate transcription. Structural analysis of the tree shrew and opossum p53TDs indicated that amino acid substitutions within two distinct regions of their p53TDs can dramatically alter hydrophobic packing of the tetramer, and in particular substitutions at positions corresponding to F341 and Q354 of the human p53TD. Together, the results suggest that subtle changes in the sequence of the p53TD can dramatically alter the stability, and potentially lead to important changes in the functional activity, of the p53 protein.
Collapse
Affiliation(s)
- Shuya Sakaguchi
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan; (S.S.); (N.N.); (J.W.); (R.K.)
| | - Natsumi Nakagawa
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan; (S.S.); (N.N.); (J.W.); (R.K.)
| | - Haytham M. Wahba
- Département de Biochimie et Médicine Moléculaire, Université de Montréal, C.P. 6128 Succursale Centre-Ville, Montréal, QC H3C 3J7, Canada;
- Department of Biochemistry, Faculty of Pharmacy, Beni-Suef University, Beni-Suef 2722165, Egypt
| | - Junya Wada
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan; (S.S.); (N.N.); (J.W.); (R.K.)
| | - Rui Kamada
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan; (S.S.); (N.N.); (J.W.); (R.K.)
| | - James G. Omichinski
- Département de Biochimie et Médicine Moléculaire, Université de Montréal, C.P. 6128 Succursale Centre-Ville, Montréal, QC H3C 3J7, Canada;
| | - Kazuyasu Sakaguchi
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo 060-0810, Japan; (S.S.); (N.N.); (J.W.); (R.K.)
| |
Collapse
|
4
|
Nicolini F, Todorovski T, Puig E, Díaz-Lobo M, Vilaseca M, García J, Andreu D, Giralt E. How Do Cancer-Related Mutations Affect the Oligomerisation State of the p53 Tetramerisation Domain? Curr Issues Mol Biol 2023; 45:4985-5004. [PMID: 37367066 DOI: 10.3390/cimb45060317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2023] [Revised: 05/29/2023] [Accepted: 06/02/2023] [Indexed: 06/28/2023] Open
Abstract
Tumour suppressor p53 plays a key role in the development of cancer and has therefore been widely studied in recent decades. While it is well known that p53 is biologically active as a tetramer, the tetramerisation mechanism is still not completely understood. p53 is mutated in nearly 50% of cancers, and mutations can alter the oligomeric state of the protein, having an impact on the biological function of the protein and on cell fate decisions. Here, we describe the effects of a number of representative cancer-related mutations on tetramerisation domain (TD) oligomerisation defining a peptide length that permits having a folded and structured domain, thus avoiding the effect of the flanking regions and the net charges at the N- and C-terminus. These peptides have been studied under different experimental conditions. We have applied a variety of techniques, including circular dichroism (CD), native mass spectrometry (MS) and high-field solution NMR. Native MS allows us to detect the native state of complexes maintaining the peptide complexes intact in the gas phase; the secondary and quaternary structures were analysed in solution by NMR, and the oligomeric forms were assigned by diffusion NMR experiments. A significant destabilising effect and a variable monomer population were observed for all the mutants studied.
Collapse
Affiliation(s)
- Federica Nicolini
- Institute for Research in Biomedicine (IRB Barcelona), Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Toni Todorovski
- Institute for Research in Biomedicine (IRB Barcelona), Baldiri Reixac 10, 08028 Barcelona, Spain
- Department of Medicine and Life Sciences, Universitat Pompeu Fabra, Barcelona Biomedical Research Park, Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Eduard Puig
- Institute for Research in Biomedicine (IRB Barcelona), Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Mireia Díaz-Lobo
- Institute for Research in Biomedicine (IRB Barcelona), Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Marta Vilaseca
- Institute for Research in Biomedicine (IRB Barcelona), Baldiri Reixac 10, 08028 Barcelona, Spain
| | - Jesús García
- Institute for Research in Biomedicine (IRB Barcelona), Baldiri Reixac 10, 08028 Barcelona, Spain
| | - David Andreu
- Department of Medicine and Life Sciences, Universitat Pompeu Fabra, Barcelona Biomedical Research Park, Dr. Aiguader 88, 08003 Barcelona, Spain
| | - Ernest Giralt
- Institute for Research in Biomedicine (IRB Barcelona), Baldiri Reixac 10, 08028 Barcelona, Spain
- Department of Inorganic and Organic Chemistry, University of Barcelona, Martí i Franquès 1-11, 08028 Barcelona, Spain
| |
Collapse
|
5
|
Gencel-Augusto J, Su X, Qi Y, Whitley EM, Pant V, Xiong S, Shah V, Lin J, Perez E, Fiorotto ML, Mahmud I, Jain AK, Lorenzi PL, Navin NE, Richie ER, Lozano G. Dimeric p53 Mutant Elicits Unique Tumor-Suppressive Activities through an Altered Metabolic Program. Cancer Discov 2023; 13:1230-1249. [PMID: 37067911 PMCID: PMC10164062 DOI: 10.1158/2159-8290.cd-22-0872] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 12/20/2022] [Accepted: 02/27/2023] [Indexed: 04/18/2023]
Abstract
Cancer-related alterations of the p53 tetramerization domain (TD) abrogate wild-type (WT) p53 function. They result in a protein that preferentially forms monomers or dimers, which are also normal p53 states under basal cellular conditions. However, their physiologic relevance is not well understood. We have established in vivo models for monomeric and dimeric p53, which model Li-Fraumeni syndrome patients with germline p53 TD alterations. p53 monomers are inactive forms of the protein. Unexpectedly, p53 dimers conferred some tumor suppression that is not mediated by canonical WT p53 activities. p53 dimers upregulate the PPAR pathway. These activities are associated with lower prevalence of thymic lymphomas and increased CD8+ T-cell differentiation. Lymphomas derived from dimeric p53 mice show cooperating alterations in the PPAR pathway, further implicating a role for these activities in tumor suppression. Our data reveal novel functions for p53 dimers and support the exploration of PPAR agonists as therapies. SIGNIFICANCE New mouse models with TP53R342P (monomer) or TP53A347D (dimer) mutations mimic Li-Fraumeni syndrome. Although p53 monomers lack function, p53 dimers conferred noncanonical tumor-suppressive activities. We describe novel activities for p53 dimers facilitated by PPARs and propose these are "basal" p53 activities. See related commentary by Stieg et al., p. 1046. See related article by Choe et al., p. 1250. This article is highlighted in the In This Issue feature, p. 1027.
Collapse
Affiliation(s)
- Jovanka Gencel-Augusto
- The University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences
- Department of Genetics, The University of Texas MD Anderson Cancer Center (MDACC)
| | - Xiaoping Su
- Department of Bioinformatics and Computational Biology, MDACC
| | - Yuan Qi
- Department of Bioinformatics and Computational Biology, MDACC
| | | | - Vinod Pant
- Department of Genetics, The University of Texas MD Anderson Cancer Center (MDACC)
| | - Shunbin Xiong
- Department of Genetics, The University of Texas MD Anderson Cancer Center (MDACC)
| | - Vrutant Shah
- Department of Genetics, The University of Texas MD Anderson Cancer Center (MDACC)
| | - Jerome Lin
- Department of Genetics, The University of Texas MD Anderson Cancer Center (MDACC)
| | | | - Marta L. Fiorotto
- USDA/Agricultural Research Service Children’s Nutrition Research Center, Department of Pediatrics, Baylor College of Medicine
| | - Iqbal Mahmud
- Department of Bioinformatics and Computational Biology, MDACC
- Metabolomics Core Facility, MDACC
| | - Abhinav K. Jain
- Department of Epigenetics and Molecular Carcinogenesis, MDACC
| | - Philip L. Lorenzi
- Department of Bioinformatics and Computational Biology, MDACC
- Metabolomics Core Facility, MDACC
| | - Nicholas E. Navin
- The University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences
- Department of Genetics, The University of Texas MD Anderson Cancer Center (MDACC)
| | - Ellen R. Richie
- The University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences
- Department of Epigenetics and Molecular Carcinogenesis, MDACC
| | - Guillermina Lozano
- The University of Texas MD Anderson Cancer Center UTHealth Houston Graduate School of Biomedical Sciences
- Department of Genetics, The University of Texas MD Anderson Cancer Center (MDACC)
| |
Collapse
|
6
|
Bernardo N, Crespo I, Cuppari A, Meijer WJJ, Boer DR. A tetramerization domain in prokaryotic and eukaryotic transcription regulators homologous to p53. Acta Crystallogr D Struct Biol 2023; 79:259-267. [PMID: 36876435 PMCID: PMC9986798 DOI: 10.1107/s2059798323001298] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Accepted: 02/13/2023] [Indexed: 03/05/2023] Open
Abstract
Transcriptional regulation usually requires the action of several proteins that either repress or activate a promotor of an open reading frame. These proteins can counteract each other, thus allowing tight regulation of the transcription of the corresponding genes, where tight repression is often linked to DNA looping or cross-linking. Here, the tetramerization domain of the bacterial gene repressor Rco from Bacillus subtilis plasmid pLS20 (RcopLS20) has been identified and its structure is shown to share high similarity to the tetramerization domain of the well known p53 family of human tumor suppressors, despite lacking clear sequence homology. In RcopLS20, this tetramerization domain is responsible for inducing DNA looping, a process that involves multiple tetramers. In accordance, it is shown that RcopLS20 can form octamers. This domain was named TetDloop and its occurrence was identified in other Bacillus species. The TetDloop fold was also found in the structure of a transcriptional repressor from Salmonella phage SPC32H. It is proposed that the TetDloop fold has evolved through divergent evolution and that the TetDloop originates from a common ancestor predating the occurrence of multicellular life.
Collapse
Affiliation(s)
- Nerea Bernardo
- Experiments Division, ALBA Synchrotron Light Source, Carrer de la Llum 2-26, 08290 Cerdanyola del Vallès, Catalunya, Spain
| | - Isidro Crespo
- Experiments Division, ALBA Synchrotron Light Source, Carrer de la Llum 2-26, 08290 Cerdanyola del Vallès, Catalunya, Spain
| | - Anna Cuppari
- Experiments Division, ALBA Synchrotron Light Source, Carrer de la Llum 2-26, 08290 Cerdanyola del Vallès, Catalunya, Spain
| | - Wilfried J J Meijer
- Centro de Biología Molecular `Severo Ochoa' (CSIC-UAM), Universidad Autónoma de Madrid, Calle Nicolás Cabrera 1, Canto Blanco, 28049 Madrid, Spain
| | - D Roeland Boer
- Experiments Division, ALBA Synchrotron Light Source, Carrer de la Llum 2-26, 08290 Cerdanyola del Vallès, Catalunya, Spain
| |
Collapse
|
7
|
Chen C, Fu G, Guo Q, Xue S, Luo SZ. Phase separation of p53 induced by its unstructured basic region and prevented by oncogenic mutations in tetramerization domain. Int J Biol Macromol 2022; 222:207-216. [PMID: 36108750 DOI: 10.1016/j.ijbiomac.2022.09.087] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Revised: 08/30/2022] [Accepted: 09/09/2022] [Indexed: 11/05/2022]
Abstract
Liquid-liquid phase separation (LLPS) drives the formation of extensive membrane-less compartments to regulate various cellular biological activities both physiologically and pathologically. It has been widely accepted that LLPS is closely related to amyloid diseases and increasing reports have linked this phenomenon to cancers. Mutations of tumor suppressor protein p53 exist in more than half of malignant tumors, making the protein vitally important in cancer research. Recently, p53 was reported to undergo phase separation, which may regulate the function of p53. The molecular mechanism of p53 phase separation and how this process relates to cancer remains largely unclear. Herein, we find that the disordered unstructured basic region (UBR) plays a crucial role in p53 LLPS, driven by electrostatic and hydrophobic interactions. Mutations in the tetramerization domain (TD) disrupt p53 phase separation by preventing the tetramer formation. Furthermore, our results have revealed that, in response to DNA damage in cell, the wild type (WT) p53 undergoes LLPS, while LLPS in oncogenic mutations is diminished or eliminated. The expression of the target gene of p53 decreased significantly with the mutations and cell survival increased with the mutations. Thus, we propose a novel mechanism of p53 carcinogenesis, whereby oncogenic mutations in TD impair the formation of p53 condensates, decreasing the activation of target genes and promoting cancer progression. This study helps to understand the behavior and function of p53 in a different aspect and may provide insights into cancer therapies targeting p53.
Collapse
Affiliation(s)
- Chen Chen
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
| | - Gaohong Fu
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
| | - Quanqiang Guo
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China
| | - Song Xue
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Shi-Zhong Luo
- Beijing Key Laboratory of Bioprocess, College of Life Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
| |
Collapse
|
8
|
Structural Basis of Mutation-Dependent p53 Tetramerization Deficiency. Int J Mol Sci 2022; 23:ijms23147960. [PMID: 35887312 PMCID: PMC9316806 DOI: 10.3390/ijms23147960] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Revised: 07/13/2022] [Accepted: 07/15/2022] [Indexed: 02/01/2023] Open
Abstract
The formation of a tetrameric assembly is essential for the ability of the tumor suppressor protein p53 to act as a transcription factor. Such a quaternary conformation is driven by a specific tetramerization domain, separated from the central DNA-binding domain by a flexible linker. Despite the distance, functional crosstalk between the two domains has been reported. This phenomenon can explain the pathogenicity of some inherited or somatically acquired mutations in the tetramerization domain, including the widespread R337H missense mutation present in the population in south Brazil. In this work, we combined computational predictions through extended all-atom molecular dynamics simulations with functional assays in a genetically defined yeast-based model system to reveal structural features of p53 tetramerization domains and their transactivation capacity and specificity. In addition to the germline and cancer-associated R337H and R337C, other rationally designed missense mutations targeting a significant salt-bridge interaction that stabilizes the p53 tetramerization domain were studied (i.e., R337D, D352R, and the double-mutation R337D plus D352R). The simulations revealed a destabilizing effect of the pathogenic mutations within the p53 tetramerization domain and highlighted the importance of electrostatic interactions between residues 337 and 352. The transactivation assay, performed in yeast by tuning the expression of wild-type and mutant p53 proteins, revealed that p53 tetramerization mutations could decrease the transactivation potential and alter transactivation specificity, in particular by better tolerating negative features in weak DNA-binding sites. These results establish the effect of naturally occurring variations at positions 337 and 352 on p53’s conformational stability and function.
Collapse
|
9
|
Tourigny DS, Zucker M, Kim M, Russo P, Coleman J, Lee CH, Carlo MI, Chen YB, Hakimi AA, Kotecha RR, Reznik E. Molecular Characterization of the Tumor Microenvironment in Renal Medullary Carcinoma. Front Oncol 2022; 12:910147. [PMID: 35837094 PMCID: PMC9275834 DOI: 10.3389/fonc.2022.910147] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 05/27/2022] [Indexed: 11/13/2022] Open
Abstract
Renal medullary carcinoma (RMC) is a highly aggressive disease associated with sickle hemoglobinopathies and universal loss of the tumor suppressor gene SMARCB1. RMC has a relatively low rate of incidence compared with other renal cell carcinomas (RCCs) that has hitherto made molecular profiling difficult. To probe this rare disease in detail we performed an in-depth characterization of the RMC tumor microenvironment using a combination of genomic, metabolic and single-cell RNA-sequencing experiments on tissue from a representative untreated RMC patient, complemented by retrospective analyses of archival tissue and existing published data. Our study of the tumor identifies a heterogenous population of malignant cell states originating from the thick ascending limb of the Loop of Henle within the renal medulla. Transformed RMC cells displayed the hallmarks of increased resistance to cell death by ferroptosis and proteotoxic stress driven by MYC-induced proliferative signals. Specifically, genomic characterization of RMC tumors provides substantiating evidence for the recently proposed dependence of SMARCB1-difficient cancers on proteostasis modulated by an intact CDKN2A-p53 pathway. We also provide evidence that increased cystine-mTORC-GPX4 signaling plays a role in protecting transformed RMC cells against ferroptosis. We further propose that RMC has an immune landscape comparable to that of untreated RCCs, including heterogenous expression of the immune ligand CD70 within a sub-population of tumor cells. The latter could provide an immune-modulatory role that serves as a viable candidate for therapeutic targeting.
Collapse
Affiliation(s)
- David S. Tourigny
- Irving Institute for Cancer Dynamics, Columbia University, New York, NY, United States
- School of Mathematics, University of Birmingham, Birmingham, United Kingdom
- *Correspondence: David S. Tourigny, ; A. Ari Hakimi, ; Ritesh R. Kotecha, ; Ed Reznik,
| | - Mark Zucker
- Computational Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - Minsoo Kim
- Computational Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - Paul Russo
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - Jonathan Coleman
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - Chung-Han Lee
- Genitourinary Oncology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - Maria I. Carlo
- Genitourinary Oncology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - Ying-Bei Chen
- Department of Pathology, Memorial Sloan Kettering Cancer Center, New York, NY, United States
| | - A. Ari Hakimi
- Department of Surgery, Memorial Sloan Kettering Cancer Center, New York, NY, United States
- *Correspondence: David S. Tourigny, ; A. Ari Hakimi, ; Ritesh R. Kotecha, ; Ed Reznik,
| | - Ritesh R. Kotecha
- Genitourinary Oncology Service, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, NY, United States
- *Correspondence: David S. Tourigny, ; A. Ari Hakimi, ; Ritesh R. Kotecha, ; Ed Reznik,
| | - Ed Reznik
- Computational Oncology, Memorial Sloan Kettering Cancer Center, New York, NY, United States
- *Correspondence: David S. Tourigny, ; A. Ari Hakimi, ; Ritesh R. Kotecha, ; Ed Reznik,
| |
Collapse
|
10
|
Soft Tissue Sarcoma Study: Association of Genetic Alterations in the Apoptosis Pathways with Chemoresistance to Doxorubicin. Cancers (Basel) 2022; 14:cancers14071796. [PMID: 35406568 PMCID: PMC8997914 DOI: 10.3390/cancers14071796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Revised: 03/15/2022] [Accepted: 03/30/2022] [Indexed: 11/25/2022] Open
Abstract
Simple Summary Genotoxic chemotherapy is the main component of the treatment for advanced soft tissue sarcomas. However, its efficacy is rather low and it is followed by rapid appearance of drug resistance. Our study was directed to the search of molecular drivers of chemoresistance in synovial and undifferentiated pleomorphic sarcomas to genotoxic drugs mostly used for their treatment. Using primary cell cultures obtained from sarcomas after surgery, we estimated their chemoresistance in vitro and performed exome sequencing. We revealed that cancer cells of more than one quarter of patients had molecular alterations preventing apoptosis and observed an association between molecular alterations found and chemoresistance to Doxorubicin, but not to Ifosfamide or Gemcitabine and Docetaxel. Information concerning the peculiar drivers of individual drug resistance could help to improve personalized chemotherapy by withdrawal from an inefficient drug or by targeting the revealed mechanism of chemoresistance. Abstract Soft tissue sarcomas (STS) are heterogeneous cancers with more than 100 histological subtypes, different in molecular alterations, which make its personalized therapy very complex. Gold standard of chemotherapy for advanced STS includes combinations of Doxorubicin and Ifosfamide or Gemcitabine and Docetaxel. Chemotherapy is efficient for less than 50% of patients and it is followed by a fast development of drug resistance. Our study was directed to the search of genetic alterations in cancer cells associated with chemoresistance of undifferentiated pleomorphic and synovial sarcomas to the abovementioned genotoxic drugs. We analyzed chemoresistance of cancer cells in vitro using primary STS cultures and performed genetic analysis for the components of apoptotic signaling. In 27% of tumors, we revealed alterations in TP53, ATM, PIK3CB, PIK3R1, NTRK1, and CSF2RB. Cells from STS specimens with found genetic alterations were resistant to Dox, excluding the only one case when TP53 mutation resulted in the substitution Leu344Arg associated with partial oligomerization loss and did not cause total loss of TP53 function. Significant association between alterations in the components of apoptosis signaling and chemoresistance to Dox was found. Our data are important to elaborate further the therapeutic strategy for STS patients with alterations in apoptotic signaling.
Collapse
|
11
|
Yu Y, Dong X, Tang Y, Li L, Wei G. Mechanistic insight into the destabilization of p53TD tetramer by cancer-related R337H mutation: a molecular dynamics study. Phys Chem Chem Phys 2022; 24:5199-5210. [PMID: 35166747 DOI: 10.1039/d1cp05670k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The p53 protein is a tumor suppressor crucial for cell cycle and genome integrity. In a very large proportion of human cancers, p53 is frequently inactivated by mutations located in its DNA-binding domain (DBD). Some experimental studies reported that the inherited R337H mutation located in the p53 tetramerization domain (p53TD) can also result in destabilization of the p53 protein, and consequently lead to an organism prone to cancer setup. However, the underlying R337H mutation-induced structural destabilization mechanism is not well understood. Herein, we investigate the structural stability and dynamic property of the wild type p53TD tetramer and its cancer-related R337H mutant by performing multiple microsecond molecular dynamics simulations. It is found that R337H mutation destroys the R337-D352 hydrogen bonds, weakens the F341-F341 π-π stacking interaction and the hydrophobic interaction between aliphatic hydrocarbons of R337 and M340, leading to more solvent exposure of all the hydrophobic cores, and thus disrupting the structural integrity of the tetramer. Importantly, our simulations show for the first time that R337H mutation results in unfolding of the α-helix starting from the N-terminal region (residues 335RER(H)FEM340). Consistently, community network analyses reveal that R337H mutation reduces dynamical correlation and global connectivity of p53TD tetramer, which destabilizes the structure of the p53TD tetramer. This study provides the atomistic mechanism of R337H mutation-induced destabilization of p53TD tetramer, which might be helpful for in-depth understanding of the p53 loss-of-function mechanism.
Collapse
Affiliation(s)
- Yawei Yu
- Department of physics, State Key Laboratory of Surface Physics, and Key Laboratory for Computational Physical Sciences (Ministry of Education), Fudan University, Shanghai 200438, People's Republic of China.
| | - Xuewei Dong
- Department of physics, State Key Laboratory of Surface Physics, and Key Laboratory for Computational Physical Sciences (Ministry of Education), Fudan University, Shanghai 200438, People's Republic of China.
| | - Yiming Tang
- Department of physics, State Key Laboratory of Surface Physics, and Key Laboratory for Computational Physical Sciences (Ministry of Education), Fudan University, Shanghai 200438, People's Republic of China.
| | - Le Li
- Department of physics, State Key Laboratory of Surface Physics, and Key Laboratory for Computational Physical Sciences (Ministry of Education), Fudan University, Shanghai 200438, People's Republic of China.
| | - Guanghong Wei
- Department of physics, State Key Laboratory of Surface Physics, and Key Laboratory for Computational Physical Sciences (Ministry of Education), Fudan University, Shanghai 200438, People's Republic of China.
| |
Collapse
|
12
|
Ou A, Zhao X, Lu Z. The potential roles of p53 signaling reactivation in pancreatic cancer therapy. Biochim Biophys Acta Rev Cancer 2022; 1877:188662. [PMID: 34861354 DOI: 10.1016/j.bbcan.2021.188662] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2021] [Revised: 11/24/2021] [Accepted: 11/24/2021] [Indexed: 12/25/2022]
Abstract
Globally, pancreatic cancer (PC) is a common and highly malignant gastrointestinal tumor that is characterized by an insidious onset and ready metastasis and recurrence. Over recent decades, the incidence of PC has been increasing on an annual basis; however, the pathogenesis of this condition remains enigmatic. PC is not sensitive to radio- or chemotherapy, and except for early surgical resection, there is no curative treatment regime; consequently, the prognosis for patients with PC is extremely poor. Transcription factor p53 is known to play key roles in many important biological processes in vertebrates, including normal cell growth, differentiation, cell cycle progression, senescence, apoptosis, metabolism, and DNA damage repair. However, there is a significant paucity of basic and clinical studies to describe how p53 gene mutations or protein dysfunction facilitate the occurrence, progression, invasion, and resistance to therapy, of malignancies, including PC. Herein, we describe the involvement of p53 signaling reactivation in PC treatment as well as its underlying molecular mechanisms, thereby providing useful insights for targeting p53-related signal pathways in PC therapy.
Collapse
Affiliation(s)
- Aixin Ou
- Department of Radiology, Shengjing Hospital of China Medical University, Shenyang 110004, LN, China
| | - Xiangxuan Zhao
- Department of Radiology, Shengjing Hospital of China Medical University, Shenyang 110004, LN, China
| | - Zaiming Lu
- Department of Radiology, Shengjing Hospital of China Medical University, Shenyang 110004, LN, China.
| |
Collapse
|
13
|
Ou A, Zhao X, Lu Z. The potential roles of p53 signaling reactivation in pancreatic cancer therapy. Biochim Biophys Acta Rev Cancer 2022; 1877:188662. [DOI: doi10.1016/j.bbcan.2021.188662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
|
14
|
Kowsarnia S, Javadi N. Ovarian Cancer With Breast Metastasis and Two Pathogenic Variants of BRCA1 Gene. Cureus 2021; 13:e18691. [PMID: 34790454 PMCID: PMC8583985 DOI: 10.7759/cureus.18691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/10/2021] [Indexed: 11/16/2022] Open
Abstract
Ovarian cancer is the second most common gynecologic cancer after uterine cancer in the United States. Ovarian cancer ranks sixth in cancer deaths among women, accounting for more deaths than other female reproductive system cancers. Breast metastasis in ovarian cancer is a rare presentation and predicts a poor prognosis and challenging management. Our case is a 42-year-old Chinese woman with high-grade serous ovarian carcinoma that presents with metastasis to the breast during the course of her illness. Genetic evaluation of the ovarian tumor showed two BRCA1 pathogenic variants. Germline pathogenic variant of c.2110_2111DelAA and a somatic variant of c.4071_4096+14del40. Our patient was offered different treatment regimens but showed progression of her disease. The low survival rate and high recurrence rate in ovarian cancer show that we still need to investigate our current approved treatments. Our report aims to shed light on the genetic evaluation of ovarian tumors and treatment options available in refractory cases of progressive ovarian cancer. Furthermore, we explain our investigational therapy regimen and the reasoning behind it.
Collapse
Affiliation(s)
- Saeedeh Kowsarnia
- Research, Olive View-University of California, Los Angeles (UCLA) Education & Research Institute, Sylmar, USA
| | | |
Collapse
|
15
|
Pacini L, Lesieur C. A computational methodology to diagnose sequence-variant dynamic perturbations by comparing atomic protein structures. Bioinformatics 2021; 38:703-709. [PMID: 34694373 PMCID: PMC8574318 DOI: 10.1093/bioinformatics/btab736] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2021] [Revised: 09/29/2021] [Accepted: 10/21/2021] [Indexed: 02/03/2023] Open
Abstract
MOTIVATION The objective is to diagnose dynamics perturbations caused by amino-acid mutations as prerequisite to assess protein functional health or drug failure, simply using network models of protein X-ray structures. RESULTS We find that the differences in the allocation of the atomic interactions of each amino acid to 1D, 2D, 3D, 4D structural levels between variants structurally robust, recover experimental dynamic perturbations. The allocation measure validated on two B-pentamers variants of AB5 toxins having 17 mutations, also distinguishes dynamic perturbations of pathogenic and non-pathogenic Transthyretin single-mutants. Finally, the main proteases of the coronaviruses SARS-CoV and SARS-CoV-2 exhibit changes in the allocation measure, raising the possibility of drug failure despite the main proteases structural similarity. AVAILABILITY AND IMPLEMENTATION The Python code used for the production of the results is available at github.com/lorpac/protein_partitioning_atomic_contacts. The authors will run the analysis on any PDB structures of protein variants upon request. SUPPLEMENTARY INFORMATION Supplementary data are available at Bioinformatics online.
Collapse
Affiliation(s)
- Lorenza Pacini
- AMPERE, CNRS, Université de Lyon, Lyon, 69622, France,Institut Rhônalpin des systèmes complexes (IXXI), École Normale Supérieure de Lyon, Lyon, 69007, France
| | - Claire Lesieur
- AMPERE, CNRS, Université de Lyon, Lyon, 69622, France,Institut Rhônalpin des systèmes complexes (IXXI), École Normale Supérieure de Lyon, Lyon, 69007, France,To whom correspondence should be addressed. E-mail:
| |
Collapse
|
16
|
Luwang JW, Nair AR, Natesh R. Stability of p53 oligomers: Tetramerization of p53 impinges on its stability. Biochimie 2021; 189:99-107. [PMID: 34197865 DOI: 10.1016/j.biochi.2021.06.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2020] [Revised: 06/21/2021] [Accepted: 06/24/2021] [Indexed: 10/21/2022]
Abstract
The p53 protein has been known to exist structurally in three different forms inside the cells. Earlier studies have reported the predominance of the lower oligomeric forms of p53 over its tetrameric form inside the cells, although only the tetrameric p53 contributes to its transcriptional activity. However, it remains unclear the functional relevance of the existence of other p53 oligomers inside the cells. In this study, we characterize the stability and conformational state of tetrameric, dimeric and monomeric p53 that spans both DNA Binding Domain (DBD) and Tetramerization Domain (TD) of human p53 (94-360 amino acid residues). Intriguingly, our studies reveal an unexpected drastic reduction in tetrameric p53 thermal stability in comparison to its dimeric and monomeric form with a higher propensity to aggregate at physiological temperature. Our EMSA study suggests that tetrameric p53, not their lower oligomeric counterpart, exhibit rapid loss of binding to their consensus DNA elements at the physiological temperature. This detrimental effect of destabilization is imparted due to the tetramerization of p53 that drives the DBDs to misfold at a faster pace when compared to its lower oligomeric form. This crosstalk between DBDs is achieved when it exists as a tetramer but not as dimer or monomer. Our findings throw light on the plausible reason for the predominant existence of p53 in dimer and monomer forms inside the cells with a lesser population of tetramer form. Therefore, the transient disruption of tetramerization between TDs could be a potential cue for the stabilization of p53 inside the cells.
Collapse
Affiliation(s)
- Johnson Wahengbam Luwang
- School of Biology, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, 695551, Kerala, India
| | - Aadithye R Nair
- School of Biology, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, 695551, Kerala, India
| | - Ramanathan Natesh
- School of Biology, Indian Institute of Science Education and Research Thiruvananthapuram, Thiruvananthapuram, 695551, Kerala, India.
| |
Collapse
|
17
|
Bourgeat L, Pacini L, Serghei A, Lesieur C. Experimental diagnostic of sequence-variant dynamic perturbations revealed by broadband dielectric spectroscopy. Structure 2021; 29:1419-1429.e3. [PMID: 34051139 DOI: 10.1016/j.str.2021.05.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Revised: 03/23/2021] [Accepted: 05/07/2021] [Indexed: 02/08/2023]
Abstract
Genetic diversity leads to protein robustness, adaptability, and failure. Some sequence variants are structurally robust but functionally disturbed because mutations bring the protein onto unfolding/refolding routes resulting in misfolding diseases (e.g., Parkinson). We assume dynamic perturbations introduced by mutations foster the alternative unfolding routes and test this possibility by comparing the unfolding dynamics of the heat-labile enterotoxin B pentamers and the cholera toxin B pentamers, two pentamers structurally and functionally related and robust to 17 sequence variations. The B-subunit thermal unfolding dynamics are monitored by broadband dielectric spectroscopy in nanoconfined and weakly hydrated conditions. Distinct dielectric signals reveal the different B-subunits unfolding dynamics. Combined with network analyses, the experiments pinpoint the role of three mutations A1T, E7D, and E102A, in diverting LTB5 to alternative unfolding routes that protect LTB5 from dissociation. Altogether, the methodology diagnoses dynamics faults that may underlie functional disorder, drug resistance, or higher virulence of sequence variants.
Collapse
Affiliation(s)
- Laëtitia Bourgeat
- Univ Lyon, CNRS, INSA Lyon, Université Claude Bernard Lyon 1, Ecole Centrale de Lyon, Ampère, UMR5005, 69622 Villeurbanne, France; Univ Lyon, CNRS, IMP, 69622, Villeurbanne, France
| | - Lorenza Pacini
- Univ Lyon, CNRS, INSA Lyon, Université Claude Bernard Lyon 1, Ecole Centrale de Lyon, Ampère, UMR5005, 69622 Villeurbanne, France; Institut Rhônalpin des systèmes complexes, IXXI-ENS-Lyon, 69007, Lyon, France
| | | | - Claire Lesieur
- Univ Lyon, CNRS, INSA Lyon, Université Claude Bernard Lyon 1, Ecole Centrale de Lyon, Ampère, UMR5005, 69622 Villeurbanne, France; Institut Rhônalpin des systèmes complexes, IXXI-ENS-Lyon, 69007, Lyon, France.
| |
Collapse
|
18
|
Gencel-Augusto J, Lozano G. p53 tetramerization: at the center of the dominant-negative effect of mutant p53. Genes Dev 2021; 34:1128-1146. [PMID: 32873579 PMCID: PMC7462067 DOI: 10.1101/gad.340976.120] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
In this review, Gencel-Augusto and Lozano summarize the data on p53 mutants with a functional tetramerization domain that form mixed tetramers and in some cases have dominant-negative effects (DNE) that inactivate wild-type p53. They conclude that the DNE is mostly observed after DNA damage but fails in other contexts. The p53 tumor suppressor functions as a tetrameric transcription factor to regulate hundreds of genes—many in a tissue-specific manner. Missense mutations in cancers in the p53 DNA-binding and tetramerization domains cement the importance of these domains in tumor suppression. p53 mutants with a functional tetramerization domain form mixed tetramers, which in some cases have dominant-negative effects (DNE) that inactivate wild-type p53. DNA damage appears necessary but not sufficient for DNE, indicating that upstream signals impact DNE. Posttranslational modifications and protein–protein interactions alter p53 tetramerization affecting transcription, stability, and localization. These regulatory components limit the dominant-negative effects of mutant p53 on wild-type p53 activity. A deeper understanding of the molecular basis for DNE may drive development of drugs that release WT p53 and allow tumor suppression.
Collapse
Affiliation(s)
- Jovanka Gencel-Augusto
- Genetics and Epigenetics Graduate Program, The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, Texas 77030, USA.,Department of Genetics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
| | - Guillermina Lozano
- Genetics and Epigenetics Graduate Program, The University of Texas MD Anderson Cancer Center UTHealth Graduate School of Biomedical Sciences, Houston, Texas 77030, USA.,Department of Genetics, The University of Texas MD Anderson Cancer Center, Houston, Texas 77030, USA
| |
Collapse
|
19
|
Wei T, Liu H, Chu B, Blasco P, Liu Z, Tian R, Li DX, Li X. Phosphorylation-regulated HMGA1a-P53 interaction unveils the function of HMGA1a acidic tail phosphorylations via synthetic proteins. Cell Chem Biol 2021; 28:722-732.e8. [PMID: 33545070 DOI: 10.1016/j.chembiol.2021.01.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2020] [Revised: 11/13/2020] [Accepted: 01/06/2021] [Indexed: 01/10/2023]
Abstract
As a typical member of intrinsically disordered proteins (IDPs), HMGA1a carries many post-translational modifications (PTMs). To study the undefined function of acidic tail phosphorylations, seven HMGA1a proteins with site-specific modification(s) were chemically synthesized via Ser/Thr ligation. We found that the phosphorylations significantly inhibit HMGA1a-P53 interaction and the phosphorylations can induce conformational change of HMGA1a from an "open state" to a "close state." Notably, the positively charged lysine-arginine (KR) clusters are responsible for modulating HMGA1a conformation via electrostatic interaction with the phosphorylated acidic tail. Finally, we used a synthetic protein-affinity purification mass spectrometry (SP-AP-MS) methodology to profile the specific interactors, which further supported the function of HMGA1a phosphorylation. Collectively, this study highlights a mechanism for regulating IDPs' conformation and function by phosphorylation of non-protein-binding domain and showcases that the protein chemical synthesis in combination with mass spectrometry can serve as an efficient tool to study the IDPs' PTMs.
Collapse
Affiliation(s)
- Tongyao Wei
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong Kong, P. R. China
| | - Heng Liu
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong Kong, P. R. China
| | - Bizhu Chu
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, P. R. China
| | - Pilar Blasco
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong Kong, P. R. China
| | - Zheng Liu
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong Kong, P. R. China
| | - Ruijun Tian
- Department of Chemistry, Southern University of Science and Technology, Shenzhen, P. R. China
| | - David Xiang Li
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong Kong, P. R. China
| | - Xuechen Li
- Department of Chemistry, State Key Laboratory of Synthetic Chemistry, The University of Hong Kong, Hong Kong, P. R. China.
| |
Collapse
|
20
|
|
21
|
Liu Y, Duan Z, Fang J, Zhang F, Xiao J, Zhang WB. Cellular Synthesis and X-ray Crystal Structure of a Designed Protein Heterocatenane. Angew Chem Int Ed Engl 2020; 59:16122-16127. [PMID: 32506656 DOI: 10.1002/anie.202005490] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2020] [Indexed: 01/24/2023]
Abstract
Herein, we report the biosynthesis of protein heterocatenanes using a programmed sequence of multiple post-translational processing events including intramolecular chain entanglement, in situ backbone cleavage, and spontaneous cyclization. The approach is general, autonomous, and can obviate the need for any additional enzymes. The catenane topology was convincingly proven using a combination of SDS-PAGE, LC-MS, size exclusion chromatography, controlled proteolytic digestion, and protein crystallography. The X-ray crystal structure clearly shows two mechanically interlocked protein rings with intact folded domains. It opens new avenues in the nascent field of protein-topology engineering.
Collapse
Affiliation(s)
- Yajie Liu
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry &, Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China
| | - Zelin Duan
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, P. R. China
| | - Jing Fang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry &, Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China
| | - Fan Zhang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry &, Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China
| | - Junyu Xiao
- State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking-Tsinghua Center for Life Sciences, Peking University, Beijing, 100871, P. R. China
| | - Wen-Bin Zhang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Polymer Chemistry &, Physics of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China
| |
Collapse
|
22
|
Liu Y, Duan Z, Fang J, Zhang F, Xiao J, Zhang W. Cellular Synthesis and X‐ray Crystal Structure of a Designed Protein Heterocatenane. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Yajie Liu
- Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry &, Physics of Ministry of Education Center for Soft Matter Science and Engineering College of Chemistry and Molecular Engineering Peking University Beijing 100871 P. R. China
| | - Zelin Duan
- State Key Laboratory of Protein and Plant Gene Research School of Life Sciences Peking-Tsinghua Center for Life Sciences Peking University Beijing 100871 P. R. China
| | - Jing Fang
- Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry &, Physics of Ministry of Education Center for Soft Matter Science and Engineering College of Chemistry and Molecular Engineering Peking University Beijing 100871 P. R. China
| | - Fan Zhang
- Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry &, Physics of Ministry of Education Center for Soft Matter Science and Engineering College of Chemistry and Molecular Engineering Peking University Beijing 100871 P. R. China
| | - Junyu Xiao
- State Key Laboratory of Protein and Plant Gene Research School of Life Sciences Peking-Tsinghua Center for Life Sciences Peking University Beijing 100871 P. R. China
| | - Wen‐Bin Zhang
- Beijing National Laboratory for Molecular Sciences Key Laboratory of Polymer Chemistry &, Physics of Ministry of Education Center for Soft Matter Science and Engineering College of Chemistry and Molecular Engineering Peking University Beijing 100871 P. R. China
| |
Collapse
|
23
|
Powers J, Pinto EM, Barnoud T, Leung JC, Martynyuk T, Kossenkov AV, Philips AH, Desai H, Hausler R, Kelly G, Le AN, Li MM, MacFarland SP, Pyle LC, Zelley K, Nathanson KL, Domchek SM, Slavin TP, Weitzel JN, Stopfer JE, Garber JE, Joseph V, Offit K, Dolinsky JS, Gutierrez S, McGoldrick K, Couch FJ, Levin B, Edelman MC, Levy CF, Spunt SL, Kriwacki RW, Zambetti GP, Ribeiro RC, Murphy ME, Maxwell KN. A Rare TP53 Mutation Predominant in Ashkenazi Jews Confers Risk of Multiple Cancers. Cancer Res 2020; 80:3732-3744. [PMID: 32675277 DOI: 10.1158/0008-5472.can-20-1390] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 05/28/2020] [Accepted: 06/29/2020] [Indexed: 01/14/2023]
Abstract
Germline mutations in TP53 cause a rare high penetrance cancer syndrome, Li-Fraumeni syndrome (LFS). Here, we identified a rare TP53 tetramerization domain missense mutation, c.1000G>C;p.G334R, in a family with multiple late-onset LFS-spectrum cancers. Twenty additional c.1000G>C probands and one c.1000G>A proband were identified, and available tumors showed biallelic somatic inactivation of TP53. The majority of families were of Ashkenazi Jewish descent, and the TP53 c.1000G>C allele was found on a commonly inherited chromosome 17p13.1 haplotype. Transient transfection of the p.G334R allele conferred a mild defect in colony suppression assays. Lymphoblastoid cell lines from the index family in comparison with TP53 normal lines showed that although classical p53 target gene activation was maintained, a subset of p53 target genes (including PCLO, PLTP, PLXNB3, and LCN15) showed defective transactivation when treated with Nutlin-3a. Structural analysis demonstrated thermal instability of the G334R-mutant tetramer, and the G334R-mutant protein showed increased preponderance of mutant conformation. Clinical case review in comparison with classic LFS cohorts demonstrated similar rates of pediatric adrenocortical tumors and other LFS component cancers, but the latter at significantly later ages of onset. Our data show that TP53 c.1000G>C;p.G334R is found predominantly in Ashkenazi Jewish individuals, causes a mild defect in p53 function, and leads to low penetrance LFS. SIGNIFICANCE: TP53 c.1000C>G;p.G334R is a pathogenic, Ashkenazi Jewish-predominant mutation associated with a familial multiple cancer syndrome in which carriers should undergo screening and preventive measures to reduce cancer risk.
Collapse
Affiliation(s)
- Jacquelyn Powers
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Emilia M Pinto
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee
| | - Thibaut Barnoud
- Program in Molecular and Cellular Oncogenesis, Wistar Institute, Philadelphia, Pennsylvania
| | - Jessica C Leung
- Program in Molecular and Cellular Oncogenesis, Wistar Institute, Philadelphia, Pennsylvania
| | - Tetyana Martynyuk
- Program in Molecular and Cellular Oncogenesis, Wistar Institute, Philadelphia, Pennsylvania
| | - Andrew V Kossenkov
- Program in Gene Expression and Regulation, Wistar Institute, Philadelphia, Pennsylvania
| | - Aaron H Philips
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, Tennessee
| | - Heena Desai
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Ryan Hausler
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Gregory Kelly
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Anh N Le
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania
| | - Marilyn M Li
- Division of Genomic Diagnostics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Suzanne P MacFarland
- Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Louise C Pyle
- Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Kristin Zelley
- Department of Pediatrics, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania
| | - Katherine L Nathanson
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.,Department of Genetics, University of Pennsylvania, Philadelphia, Pennsylvania.,Abramson Cancer Center, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Susan M Domchek
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania.,Abramson Cancer Center, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| | - Thomas P Slavin
- Department of Medical Oncology and Therapeutics Research, City of Hope, Duarte, California
| | - Jeffrey N Weitzel
- Department of Medical Oncology and Therapeutics Research, City of Hope, Duarte, California
| | - Jill E Stopfer
- Division of Cancer Genetics and Prevention, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Judy E Garber
- Division of Cancer Genetics and Prevention, Dana-Farber Cancer Institute, Boston, Massachusetts
| | - Vijai Joseph
- Clinical Genetics Research Lab, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Kenneth Offit
- Clinical Genetics Research Lab, Department of Medicine, Memorial Sloan Kettering Cancer Center, New York, New York
| | - Jill S Dolinsky
- Division of Clinical Affairs, Division of Bioinformatics, Ambry Genetics, Aliso Viejo, California
| | - Stephanie Gutierrez
- Division of Clinical Affairs, Division of Bioinformatics, Ambry Genetics, Aliso Viejo, California
| | - Kelly McGoldrick
- Division of Clinical Affairs, Division of Bioinformatics, Ambry Genetics, Aliso Viejo, California
| | - Fergus J Couch
- Department of Laboratory Medicine and Pathology, Mayo Clinic, Rochester, Minnesota
| | - Brooke Levin
- MD Anderson Cancer Center at Cooper, Camden, New Jersey
| | - Morris C Edelman
- Cohen Children's Medical Center of New York, New Hyde Park, New York
| | - Carolyn Fein Levy
- Cohen Children's Medical Center of New York, New Hyde Park, New York
| | - Sheri L Spunt
- Division of Hematology/Oncology, Department of Pediatrics, Stanford University School of Medicine, Palo Alto, California
| | - Richard W Kriwacki
- Department of Structural Biology, St. Jude Children's Research Hospital, Memphis, Tennessee
| | - Gerard P Zambetti
- Department of Pathology, St. Jude Children's Research Hospital, Memphis, Tennessee
| | - Raul C Ribeiro
- Department of Oncology, St. Jude Children's Research Hospital, Memphis, Tennessee
| | - Maureen E Murphy
- Program in Molecular and Cellular Oncogenesis, Wistar Institute, Philadelphia, Pennsylvania
| | - Kara N Maxwell
- Department of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania. .,Department of Genetics, University of Pennsylvania, Philadelphia, Pennsylvania.,Abramson Cancer Center, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania
| |
Collapse
|
24
|
Aversa JG, De Abreu FB, Yano S, Xi L, Hadley DW, Manoli I, Raffeld M, Sadowski SM, Nilubol N. The first pancreatic neuroendocrine tumor in Li-Fraumeni syndrome: a case report. BMC Cancer 2020; 20:256. [PMID: 32228502 PMCID: PMC7106707 DOI: 10.1186/s12885-020-06723-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Accepted: 03/06/2020] [Indexed: 01/06/2023] Open
Abstract
Background Li-Fraumeni syndrome is a cancer predisposition syndrome caused by germline TP53 tumor suppressor gene mutations, with no previous association with pancreatic neuroendocrine tumors (PNETs). Here we present the first case of PNET associated with Li-Fraumeni syndrome. Case presentation This is a 43-year-old female who underwent laparoscopic distal pancreatectomy at age 39 for a well-differentiated grade 2 cystic PNET. When the patient was 41 years old, her seven-year-old daughter was found to have an astrocytoma and a germline TP53 mutation. While undergoing surveillance with 68Gallium-DOTATATE positron emission tomography/computed tomography for her PNET, the patient was found to have a large choroid plexus papilloma in her right temporal lobe. She underwent genetic counseling and testing that identified a germline pathogenic variant in TP53, leading to the diagnosis of Li-Fraumeni syndrome. Her PNET had a hemizygous pathogenic TP53 mutation with loss of the wild-type alternate allele, consistent with loss of heterozygosity and the two-hit hypothesis. She was enrolled in a Li-Fraumeni syndrome protocol and continues surveillance screening with our service. Conclusions This is the first PNET reported in association with Li-Fraumeni syndrome. Pancreatic cancer risk is elevated in this syndrome, and our case highlights the need for vigilance in screening for pancreatic neoplasms in these patients.
Collapse
Affiliation(s)
- John G Aversa
- Surgical Oncology Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Building 10, Room 4-5952, Bethesda, MD, 20892, USA
| | - Francine Blumental De Abreu
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Sho Yano
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Liqiang Xi
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Donald W Hadley
- Human Development Section, Medical Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Irini Manoli
- Medical Genomics and Metabolic Genetics Branch, National Human Genome Research Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Mark Raffeld
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, National Institutes of Health, Bethesda, MD, 20892, USA
| | - Samira M Sadowski
- Surgical Oncology Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Building 10, Room 4-5952, Bethesda, MD, 20892, USA
| | - Naris Nilubol
- Surgical Oncology Program, Center for Cancer Research, National Cancer Institute, National Institutes of Health, 10 Center Drive, Building 10, Room 4-5952, Bethesda, MD, 20892, USA.
| |
Collapse
|
25
|
García‐Cano J, Sánchez‐Tena S, Sala‐Gaston J, Figueras A, Viñals F, Bartrons R, Ventura F, Rosa JL. Regulation of the MDM2-p53 pathway by the ubiquitin ligase HERC2. Mol Oncol 2020; 14:69-86. [PMID: 31665549 PMCID: PMC6944118 DOI: 10.1002/1878-0261.12592] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 09/30/2019] [Accepted: 10/28/2019] [Indexed: 12/20/2022] Open
Abstract
The p53 tumor suppressor protein is a transcription factor that plays a prominent role in protecting cells from malignant transformation. Protein levels of p53 and its transcriptional activity are tightly regulated by the ubiquitin E3 ligase MDM2, the gene expression of which is transcriptionally regulated by p53 in a negative feedback loop. The p53 protein is transcriptionally active as a tetramer, and this oligomerization state is modulated by a complex formed by NEURL4 and the ubiquitin E3 ligase HERC2. Here, we report that MDM2 forms a complex with oligomeric p53, HERC2, and NEURL4. HERC2 knockdown results in a decline in MDM2 protein levels without affecting its protein stability, as it reduces its mRNA expression by inhibition of its promoter activation. DNA damage induced by bleomycin dissociates MDM2 from the p53/HERC2/NEURL4 complex and increases the phosphorylation and acetylation of oligomeric p53 bound to HERC2 and NEURL4. Moreover, the MDM2 promoter, which contains p53-response elements, competes with HERC2 for binding of oligomeric, phosphorylated and acetylated p53. We integrate these findings in a model showing the pivotal role of HERC2 in p53-MDM2 loop regulation. Altogether, these new insights in p53 pathway regulation are of great interest in cancer and may provide new therapeutic targets.
Collapse
Affiliation(s)
- Jesús García‐Cano
- Departament de Ciències FisiològiquesInstitut d’Investigació de Bellvitge (IDIBELL)Universitat de Barcelona: Pavelló de GovernSpain
| | - Susana Sánchez‐Tena
- Departament de Ciències FisiològiquesInstitut d’Investigació de Bellvitge (IDIBELL)Universitat de Barcelona: Pavelló de GovernSpain
| | - Joan Sala‐Gaston
- Departament de Ciències FisiològiquesInstitut d’Investigació de Bellvitge (IDIBELL)Universitat de Barcelona: Pavelló de GovernSpain
| | - Agnès Figueras
- Departament de Ciències FisiològiquesInstitut d’Investigació de Bellvitge (IDIBELL)Universitat de Barcelona: Pavelló de GovernSpain
| | - Francesc Viñals
- Departament de Ciències FisiològiquesInstitut d’Investigació de Bellvitge (IDIBELL)Universitat de Barcelona: Pavelló de GovernSpain
| | - Ramon Bartrons
- Departament de Ciències FisiològiquesInstitut d’Investigació de Bellvitge (IDIBELL)Universitat de Barcelona: Pavelló de GovernSpain
| | - Francesc Ventura
- Departament de Ciències FisiològiquesInstitut d’Investigació de Bellvitge (IDIBELL)Universitat de Barcelona: Pavelló de GovernSpain
| | - Jose Luis Rosa
- Departament de Ciències FisiològiquesInstitut d’Investigació de Bellvitge (IDIBELL)Universitat de Barcelona: Pavelló de GovernSpain
| |
Collapse
|
26
|
Nakagawa N, Sakaguchi S, Nomura T, Kamada R, Omichinski JG, Sakaguchi K. The tetramerization domain of the tree shrew p53 protein displays unique thermostability despite sharing high sequence identity with the human p53 protein. Biochem Biophys Res Commun 2019; 521:681-686. [PMID: 31690451 DOI: 10.1016/j.bbrc.2019.10.130] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Accepted: 10/17/2019] [Indexed: 01/11/2023]
Abstract
The p53 protein plays a number of roles in protecting organisms from different genotoxic stresses and this includes DNA damage induced by acetaldehyde, a metabolite of alcohol. Since the common tree shrew ingests high levels of alcohol as part of its normal diet, this suggests that its p53 protein may possess unique properties. Using a combination of biophysical and modeling studies, we demonstrate that the tetramerization domain of the tree shrew p53 protein is considerably more stable than the corresponding domain from humans despite sharing almost 90% sequence identity. Based on modeling and mutagenesis studies, we determine that a glutamine to methionine substitution at position 354 plays a key role in this difference. Given the link between stability of the p53 tetramerization domain and its transcriptional activity, the results suggest that this enhanced stability could lead to important consequences at p53-regulated genes in the tree shrew.
Collapse
Affiliation(s)
- Natsumi Nakagawa
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Shuya Sakaguchi
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Takao Nomura
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Rui Kamada
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - James G Omichinski
- Département de Biochimie et Médicine Moléculaire, Université de Montréal, Montréal, QC H3C 3J7, Canada
| | - Kazuyasu Sakaguchi
- Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan.
| |
Collapse
|
27
|
Wu CE, Koay TS, Ho YH, Lovat P, Lunec J. TP53 mutant cell lines selected for resistance to MDM2 inhibitors retain growth inhibition by MAPK pathway inhibitors but a reduced apoptotic response. Cancer Cell Int 2019; 19:53. [PMID: 30899200 PMCID: PMC6407233 DOI: 10.1186/s12935-019-0768-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 02/28/2019] [Indexed: 01/10/2023] Open
Abstract
Background Emergence of resistance to molecular targeted therapy constitutes a limitation to clinical benefits in cancer treatment. Cross-resistance commonly happens with chemotherapeutic agents but might not with targeted agents. Methods In the current study, TP53 wild-type cell lines with druggable MAPK pathway mutations [BRAF V600E (WM35) or NRAS Q61K (SJSA-1)] were compared with their TP53 mutant sublines (WM35-R, SN40R2) derived by selection for resistance to MDM2/p53 binding antagonists. Results The continued presence of the druggable MAPK pathway targets in the TP53 mutant (TP53 MUT) WM35-R and SN40R2 cells was confirmed. Trametinib and vemurafenib were tested on the paired WM35/WM35-R and SJSA-1/SN40R2 cells and similar growth inhibitory effects on the paired cell lines was observed. However, apoptotic responses to trametinib and vemurafenib were greater in WM35 than WM35-R, evidenced by FACS analysis and caspase 3/7 activity, indicating that these MAPK inhibitors acted on the cells partially through p53-regulated pathways. SiRNA mediated p53 knockdown in WM35 replicated the same pattern of response to trametinib and vemurafenib as seen in WM35-R, confirming that p53 plays a role in trametinib and vemurafenib induced apoptosis. In contrast, these differences in apoptotic response between WM35 and WM35-R were not seen with the SJSA-1/SN40R2 cell line pair. This is likely due to p53 suppression by overexpressed MDM2 in SJSA-1. Conclusion The TP53MUT cells selected by resistance to MDM2 inhibitors nevertheless retained growth inhibitory but not apoptotic response to MAPK pathway inhibitors.
Collapse
Affiliation(s)
- Chiao-En Wu
- 1Northern Institute for Cancer Research, School of Medicine, Newcastle University, Paul O'Gorman Building, Medical School, Framlington Place, Newcastle upon Tyne, NE2 4HH UK.,2Division of Hematology-Oncology, Department of Internal Medicine, Chang Gung Memorial Hospital at Linkou, Chang Gung University College of Medicine, Taoyuan, Taiwan
| | - Tsin Shue Koay
- 1Northern Institute for Cancer Research, School of Medicine, Newcastle University, Paul O'Gorman Building, Medical School, Framlington Place, Newcastle upon Tyne, NE2 4HH UK
| | - Yi-Hsuan Ho
- 1Northern Institute for Cancer Research, School of Medicine, Newcastle University, Paul O'Gorman Building, Medical School, Framlington Place, Newcastle upon Tyne, NE2 4HH UK
| | - Penny Lovat
- 3Dermatological Sciences, Institute of Cellular Medicine, Newcastle University, Newcastle, UK
| | - John Lunec
- 1Northern Institute for Cancer Research, School of Medicine, Newcastle University, Paul O'Gorman Building, Medical School, Framlington Place, Newcastle upon Tyne, NE2 4HH UK
| |
Collapse
|
28
|
Imberdis T, Fanning S, Newman A, Ramalingam N, Dettmer U. Studying α-Synuclein Conformation by Intact-Cell Cross-Linking. Methods Mol Biol 2019; 1948:77-91. [PMID: 30771172 DOI: 10.1007/978-1-4939-9124-2_8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
β-Sheet-rich aggregates of α-synuclein (αS) are the hallmark neuropathology of Parkinson's disease (PD) and related synucleinopathies, whereas the native conformations of αS in healthy cells are under debate. Cross-linking analyses in intact cells detect a large portion of endogenous αS in apparent multimeric states, most notably as putative tetramers (αS60) that run around 60 kDa on SDS-PAGE, but also point at the dynamic nature of cellular αS states. Standardization of αS cross-linking methods will facilitate efforts to study the effects of genetic, pharmacological, and environmental factors on αS conformation. Here, we present detailed protocols for cross-linking cellular αS multimers in cultured cells and brain tissues. These protocols will benefit future studies aimed at characterizing αS conformation in its cellular environment, both at steady state and upon perturbation, be it chronic or acute.
Collapse
Affiliation(s)
- Thibaut Imberdis
- Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Saranna Fanning
- Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Andrew Newman
- Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Nagendran Ramalingam
- Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
| | - Ulf Dettmer
- Ann Romney Center for Neurologic Diseases, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA.
| |
Collapse
|
29
|
Verkhivker GM. Biophysical simulations and structure-based modeling of residue interaction networks in the tumor suppressor proteins reveal functional role of cancer mutation hotspots in molecular communication. Biochim Biophys Acta Gen Subj 2018; 1863:210-225. [PMID: 30339916 DOI: 10.1016/j.bbagen.2018.10.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 10/06/2018] [Accepted: 10/13/2018] [Indexed: 12/19/2022]
Abstract
In the current study, we have combined molecular simulations and energetic analysis with dynamics-based network modeling and perturbation response scanning to determine molecular signatures of mutational hotspot residues in the p53, PTEN, and SMAD4 tumor suppressor proteins. By examining structure, energetics and dynamics of these proteins, we have shown that inactivating mutations preferentially target a group of structurally stable residues that play a fundamental role in global propagation of dynamic fluctuations and mediating allosteric interaction networks. Through integration of long-range perturbation dynamics and network-based approaches, we have quantified allosteric potential of residues in the studied proteins. The results have revealed that mutational hotspot sites often correspond to high centrality mediating centers of the residue interaction networks that are responsible for coordination of global dynamic changes and allosteric signaling. Our findings have also suggested that structurally stable mutational hotpots can act as major effectors of allosteric interactions and mutations in these positions are typically associated with severe phenotype. Modeling of shortest inter-residue pathways has shown that mutational hotspot sites can also serve as key mediating bridges of allosteric communication in the p53 and PTEN protein structures. Multiple regression models have indicated that functional significance of mutational hotspots can be strongly associated with the network signatures serving as robust predictors of critical regulatory positions responsible for loss-of-function phenotype. The results of this computational investigation are compared with the experimental studies and reveal molecular signatures of mutational hotspots, providing a plausible rationale for explaining and localizing disease-causing mutations in tumor suppressor genes.
Collapse
Affiliation(s)
- Gennady M Verkhivker
- Department of Biomedical and Pharmaceutical Sciences, Chapman University School of Pharmacy, Irvine, CA 92618, United States; Department of Pharmacology, Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA.
| |
Collapse
|
30
|
Agajanian S, Odeyemi O, Bischoff N, Ratra S, Verkhivker GM. Machine Learning Classification and Structure–Functional Analysis of Cancer Mutations Reveal Unique Dynamic and Network Signatures of Driver Sites in Oncogenes and Tumor Suppressor Genes. J Chem Inf Model 2018; 58:2131-2150. [DOI: 10.1021/acs.jcim.8b00414] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Steve Agajanian
- Graduate Program in Computational and Data Sciences, Department of Computational Sciences, Schmid College of Science and Technology, Chapman University, One University
Drive, Orange, California 92866, United States
| | - Oluyemi Odeyemi
- Graduate Program in Computational and Data Sciences, Department of Computational Sciences, Schmid College of Science and Technology, Chapman University, One University
Drive, Orange, California 92866, United States
| | - Nathaniel Bischoff
- Graduate Program in Computational and Data Sciences, Department of Computational Sciences, Schmid College of Science and Technology, Chapman University, One University
Drive, Orange, California 92866, United States
| | - Simrath Ratra
- Graduate Program in Computational and Data Sciences, Department of Computational Sciences, Schmid College of Science and Technology, Chapman University, One University
Drive, Orange, California 92866, United States
| | - Gennady M. Verkhivker
- Graduate Program in Computational and Data Sciences, Department of Computational Sciences, Schmid College of Science and Technology, Chapman University, One University
Drive, Orange, California 92866, United States
- Chapman University, School of Pharmacy, Irvine, California 92618, United States
| |
Collapse
|
31
|
Katz C, Low-Calle AM, Choe JH, Laptenko O, Tong D, Joseph-Chowdhury JSN, Garofalo F, Zhu Y, Friedler A, Prives C. Wild-type and cancer-related p53 proteins are preferentially degraded by MDM2 as dimers rather than tetramers. Genes Dev 2018; 32:430-447. [PMID: 29549180 PMCID: PMC5900715 DOI: 10.1101/gad.304071.117] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2017] [Accepted: 02/16/2018] [Indexed: 12/26/2022]
Abstract
The p53 tumor suppressor protein is the most well studied as a regulator of transcription in the nucleus, where it exists primarily as a tetramer. However, there are other oligomeric states of p53 that are relevant to its regulation and activities. In unstressed cells, p53 is normally held in check by MDM2 that targets p53 for transcriptional repression, proteasomal degradation, and cytoplasmic localization. Here we discovered a hydrophobic region within the MDM2 N-terminal domain that binds exclusively to the dimeric form of the p53 C-terminal domain in vitro. In cell-based assays, MDM2 exhibits superior binding to, hyperdegradation of, and increased nuclear exclusion of dimeric p53 when compared with tetrameric wild-type p53. Correspondingly, impairing the hydrophobicity of the newly identified N-terminal MDM2 region leads to p53 stabilization. Interestingly, we found that dimeric mutant p53 is partially unfolded and is a target for ubiquitin-independent degradation by the 20S proteasome. Finally, forcing certain tumor-derived mutant forms of p53 into dimer configuration results in hyperdegradation of mutant p53 and inhibition of p53-mediated cancer cell migration. Gaining insight into different oligomeric forms of p53 may provide novel approaches to cancer therapy.
Collapse
Affiliation(s)
- Chen Katz
- Department of Biological Sciences, Columbia University, New York, New York 10027, USA
| | - Ana Maria Low-Calle
- Department of Biological Sciences, Columbia University, New York, New York 10027, USA
| | - Joshua H Choe
- Department of Biological Sciences, Columbia University, New York, New York 10027, USA
| | - Oleg Laptenko
- Department of Biological Sciences, Columbia University, New York, New York 10027, USA
| | - David Tong
- Department of Biological Sciences, Columbia University, New York, New York 10027, USA
| | | | - Francesca Garofalo
- Department of Biological Sciences, Columbia University, New York, New York 10027, USA
| | | | - Assaf Friedler
- Institute of Chemistry, The Hebrew University of Jerusalem, Givat Ram, Jerusalem 9190401, Israel
| | - Carol Prives
- Department of Biological Sciences, Columbia University, New York, New York 10027, USA
| |
Collapse
|
32
|
Lei X, Kou Y, Fu Y, Rajashekar N, Shi H, Wu F, Xu J, Luo Y, Chen L. The Cancer Mutation D83V Induces an α-Helix to β-Strand Conformation Switch in MEF2B. J Mol Biol 2018; 430:1157-1172. [PMID: 29477338 DOI: 10.1016/j.jmb.2018.02.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Revised: 02/13/2018] [Accepted: 02/17/2018] [Indexed: 12/29/2022]
Abstract
MEF2B is a major target of somatic mutations in non-Hodgkin lymphoma. Most of these mutations are non-synonymous substitutions of surface residues in the MADS-box/MEF2 domain. Among them, D83V is the most frequent mutation found in tumor cells. The link between this hotspot mutation and cancer is not well understood. Here we show that the D83V mutation induces a dramatic α-helix to β-strand switch in the MEF2 domain. Located in an α-helix region rich in β-branched residues, the D83V mutation not only removes the extensive helix stabilization interactions but also introduces an additional β-branched residue that further shifts the conformation equilibrium from α-helix to β-strand. Cross-database analyses of cancer mutations and chameleon sequences revealed a number of well-known cancer targets harboring β-strand favoring mutations in chameleon α-helices, suggesting a commonality of such conformational switch in certain cancers and a new factor to consider when stratifying the rapidly expanding cancer mutation data.
Collapse
Affiliation(s)
- Xiao Lei
- Molecular and Computational Biology, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Yi Kou
- Molecular and Computational Biology, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA; Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA; USC Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA
| | - Yang Fu
- Molecular and Computational Biology, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Niroop Rajashekar
- Molecular and Computational Biology, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Haoran Shi
- Molecular and Computational Biology, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA
| | - Fang Wu
- Department of Statistics and Applied Probability, University of California, Santa Barbara, CA 93106, USA
| | - Jiang Xu
- Molecular and Computational Biology, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA; Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA; USC Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA
| | - Yibing Luo
- Department of Statistics, University of California, Davis, CA 95616, USA
| | - Lin Chen
- Molecular and Computational Biology, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089, USA; Department of Chemistry, University of Southern California, Los Angeles, CA 90089, USA; USC Norris Comprehensive Cancer Center, Keck School of Medicine, University of Southern California, Los Angeles, CA 90089, USA.
| |
Collapse
|
33
|
Toguchi Y, Kamada R, Kanno M, Imagawa T, Sakaguchi K. Quantitative Single Cell Analysis for Transcriptional Activity of p53 Hetero-tetramers between Wild-type Protein and Oligomerization Domain. CHEM LETT 2018. [DOI: 10.1246/cl.170980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Yu Toguchi
- Department of Chemistry, Faculty of Science, Hokkaido University, N10 W8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Rui Kamada
- Department of Chemistry, Faculty of Science, Hokkaido University, N10 W8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Madoka Kanno
- Department of Chemistry, Faculty of Science, Hokkaido University, N10 W8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Toshiaki Imagawa
- Department of Chemistry, Faculty of Science, Hokkaido University, N10 W8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| | - Kazuyasu Sakaguchi
- Department of Chemistry, Faculty of Science, Hokkaido University, N10 W8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan
| |
Collapse
|
34
|
Madan E, Parker TM, Bauer MR, Dhiman A, Pelham CJ, Nagane M, Kuppusamy ML, Holmes M, Holmes TR, Shaik K, Shee K, Kiparoidze S, Smith SD, Park YSA, Gomm JJ, Jones LJ, Tomás AR, Cunha AC, Selvendiran K, Hansen LA, Fersht AR, Hideg K, Gogna R, Kuppusamy P. The curcumin analog HO-3867 selectively kills cancer cells by converting mutant p53 protein to transcriptionally active wildtype p53. J Biol Chem 2018; 293:4262-4276. [PMID: 29382728 DOI: 10.1074/jbc.ra117.000950] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2017] [Revised: 01/10/2018] [Indexed: 01/13/2023] Open
Abstract
p53 is an important tumor-suppressor protein that is mutated in more than 50% of cancers. Strategies for restoring normal p53 function are complicated by the oncogenic properties of mutant p53 and have not met with clinical success. To counteract mutant p53 activity, a variety of drugs with the potential to reconvert mutant p53 to an active wildtype form have been developed. However, these drugs are associated with various negative effects such as cellular toxicity, nonspecific binding to other proteins, and inability to induce a wildtype p53 response in cancer tissue. Here, we report on the effects of a curcumin analog, HO-3867, on p53 activity in cancer cells from different origins. We found that HO-3867 covalently binds to mutant p53, initiates a wildtype p53-like anticancer genetic response, is exclusively cytotoxic toward cancer cells, and exhibits high anticancer efficacy in tumor models. In conclusion, HO-3867 is a p53 mutant-reactivating drug with high clinical anticancer potential.
Collapse
Affiliation(s)
- Esha Madan
- From the Champalimaud Research, Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal.,the Amity Institute of Molecular Medicine and Stem Cell Research, Amity University, Gautam Buddha Nagar Section 125, Noida 201301, India
| | - Taylor M Parker
- the Department of Surgery, Simon Cancer Research Center, Indiana University School of Medicine, Indianapolis, Indiana 46202
| | - Matthias R Bauer
- the Medical Research Council Laboratory of Molecular Biology, Cambridge CB2 0QH, United Kingdom
| | - Alisha Dhiman
- the Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, Indiana 47907
| | - Christopher J Pelham
- the Department of Pharmacology and Physiology, Saint Louis University, St. Louis, Missouri 63104
| | - Masaki Nagane
- the Department of Biochemistry, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa 252-5201, Japan
| | - M Lakshmi Kuppusamy
- the Department of Radiology and Medicine, Norris Cotton Cancer Center, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire 03756
| | - Matti Holmes
- the Department of Biomedical Sciences, Creighton University, Omaha, Nebraska 68178
| | - Thomas R Holmes
- the Department of Biomedical Sciences, Creighton University, Omaha, Nebraska 68178
| | - Kranti Shaik
- the Department of Biomedical Sciences, Creighton University, Omaha, Nebraska 68178
| | - Kevin Shee
- the Department of Radiology and Medicine, Norris Cotton Cancer Center, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire 03756
| | | | - Sean D Smith
- the Department of Biomedical Sciences, Creighton University, Omaha, Nebraska 68178
| | - Yu-Soon A Park
- the Department of Biomedical Sciences, Creighton University, Omaha, Nebraska 68178
| | - Jennifer J Gomm
- the Centre for Tumour Biology, Barts Cancer Institute, Charterhouse Square, London, EC1M 6BQ, United Kingdom
| | - Louise J Jones
- the Centre for Tumour Biology, Barts Cancer Institute, Charterhouse Square, London, EC1M 6BQ, United Kingdom
| | - Ana R Tomás
- From the Champalimaud Research, Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal
| | - Ana C Cunha
- From the Champalimaud Research, Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal
| | - Karuppaiyah Selvendiran
- the Department of Obstetrics and Gynecology, College of Medicine, The Ohio State University, Columbus, Ohio 43210, and
| | - Laura A Hansen
- the Department of Biomedical Sciences, Creighton University, Omaha, Nebraska 68178
| | - Alan R Fersht
- the Medical Research Council Laboratory of Molecular Biology, Cambridge CB2 0QH, United Kingdom
| | - Kálmán Hideg
- the Institute of Organic and Medicinal Chemistry, Faculty of Sciences, University of Pécs, Pécs-H-7624, Hungary
| | - Rajan Gogna
- From the Champalimaud Research, Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal, .,the Amity Institute of Molecular Medicine and Stem Cell Research, Amity University, Gautam Buddha Nagar Section 125, Noida 201301, India
| | - Periannan Kuppusamy
- the Department of Radiology and Medicine, Norris Cotton Cancer Center, Geisel School of Medicine, Dartmouth College, Lebanon, New Hampshire 03756,
| |
Collapse
|
35
|
C-terminal region of human p53 attenuates buffalo p53 N-terminal-specific transactivation of p21 promoter by modulating tetramerization of the protein. Mol Cell Biochem 2017; 443:101-110. [PMID: 29147811 DOI: 10.1007/s11010-017-3214-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2017] [Accepted: 10/20/2017] [Indexed: 10/18/2022]
Abstract
Here, we have studied in p53 null H1299 lung carcinoma cells, the dominant-negative effect of human p53 (h-p53) on buffalo p53 (b-p53) induced nuclear transactivation-dependent function. Recently, we have isolated and cloned the full-length cDNA of buffalo p53. Buffalo and human p53 proteins exhibit a high degree of structural and functional similarities. In transiently transfected H1299 cell line b-p53 appeared to be more sensitive to Mdm2-mediated degradation as compared to h-p53, although its ability to transactivate p21 promoter was stronger than that of the human counterpart. This higher transactivation ability of b-p53 was lost in the presence of h-p53 suggesting, a dominant-negative effect of h-p53 on b-p53's transactivation of p21 promoter. Both human and buffalo p53 proteins could hetero-oligomerize but the b-p53 could tetramerize much faster than the h-p53. A chimeric cDNA construct of human p53 was made where the 1-260 bp N-terminus was replaced with buffalo p53 counterpart and expressed in H1299 cell line. The tetramerization ability of the chimeric p53 protein was comparable to that of h-p53. Properties of b-p53 like stronger p21 transactivation and super sensitivity to Mdm2 mediated degradation were lacking in the chimeric protein. Thus, it is suggested that faster ability of tetramerization as well as higher transactivation property of buffalo p53 is determined by the interplay of N- and C-terminal domains through macromolecular interactions.
Collapse
|
36
|
Biswas R, Gao S, Cultraro CM, Maity TK, Venugopalan A, Abdullaev Z, Shaytan AK, Carter CA, Thomas A, Rajan A, Song Y, Pitts S, Chen K, Bass S, Boland J, Hanada KI, Chen J, Meltzer PS, Panchenko AR, Yang JC, Pack S, Giaccone G, Schrump DS, Khan J, Guha U. Genomic profiling of multiple sequentially acquired tumor metastatic sites from an "exceptional responder" lung adenocarcinoma patient reveals extensive genomic heterogeneity and novel somatic variants driving treatment response. Cold Spring Harb Mol Case Stud 2017; 2:a001263. [PMID: 27900369 PMCID: PMC5111000 DOI: 10.1101/mcs.a001263] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
We used next-generation sequencing to identify somatic alterations in multiple metastatic sites from an “exceptional responder” lung adenocarcinoma patient during his 7-yr course of ERBB2-directed therapies. The degree of heterogeneity was unprecedented, with ∼1% similarity between somatic alterations of the lung and lymph nodes. One novel translocation, PLAG1-ACTA2, present in both sites, up-regulated ACTA2 expression. ERBB2, the predominant driver oncogene, was amplified in both sites, more pronounced in the lung, and harbored an L869R mutation in the lymph node. Functional studies showed increased proliferation, migration, metastasis, and resistance to ERBB2-directed therapy because of L869R mutation and increased migration because of ACTA2 overexpression. Within the lung, a nonfunctional CDK12, due to a novel G879V mutation, correlated with down-regulation of DNA damage response genes, causing genomic instability, and sensitivity to chemotherapy. We propose a model whereby a subclone metastasized early from the primary site and evolved independently in lymph nodes.
Collapse
Affiliation(s)
- Romi Biswas
- Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Shaojian Gao
- Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Constance M Cultraro
- Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Tapan K Maity
- Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Abhilash Venugopalan
- Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Zied Abdullaev
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Alexey K Shaytan
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland 20894, USA
| | - Corey A Carter
- Walter Reed National Military Medical Center, Bethesda, Maryland 20889, USA
| | - Anish Thomas
- Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Arun Rajan
- Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Young Song
- Genetics Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Stephanie Pitts
- Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Kevin Chen
- Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Sara Bass
- Cancer Genomics Research Laboratory, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Gaithersburg, Maryland 20848, USA
| | - Joseph Boland
- Cancer Genomics Research Laboratory, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Gaithersburg, Maryland 20848, USA
| | - Ken-Ichi Hanada
- Surgery Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Jinqiu Chen
- Laboratory of Cell Biology, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Paul S Meltzer
- Genetics Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Anna R Panchenko
- National Center for Biotechnology Information, National Library of Medicine, National Institutes of Health, Bethesda, Maryland 20894, USA
| | - James C Yang
- Surgery Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Svetlana Pack
- Laboratory of Pathology, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Giuseppe Giaccone
- Lombardi Comprehensive Cancer Center, Georgetown University, Washington, D.C. 20057, USA
| | - David S Schrump
- Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Javed Khan
- Genetics Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| | - Udayan Guha
- Thoracic and Gastrointestinal Oncology Branch, Center for Cancer Research, National Cancer Institute, Bethesda, Maryland 20892, USA
| |
Collapse
|
37
|
Lepre MG, Omar SI, Grasso G, Morbiducci U, Deriu MA, Tuszynski JA. Insights into the Effect of the G245S Single Point Mutation on the Structure of p53 and the Binding of the Protein to DNA. Molecules 2017; 22:E1358. [PMID: 28813011 PMCID: PMC6152093 DOI: 10.3390/molecules22081358] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Revised: 08/13/2017] [Accepted: 08/13/2017] [Indexed: 12/20/2022] Open
Abstract
The transcription factor p53 is a potent tumor suppressor dubbed as the "guardian of the genome" because of its ability to orchestrate protective biological outputs in response to a variety of oncogenic stresses. Mutation and thus inactivation of p53 can be found in 50% of human tumors. The majority are missense mutations located in the DNA binding region. Among them, G245S is known to be a structural hotspot mutation. To understand the behaviors and differences between the wild-type and mutant, both a dimer of the wild type p53 (wt-p53) and its G245S mutant (G245S-mp53), complexed with DNA, were simulated using molecular dynamics for more than 1 μs. wt-p53 and G245S-mp53 apo monomers were simulated for 1 μs as well. Conformational analyses and binding energy evaluations performed underline important differences and therefore provide insights to understand the G245S-mp53 loss of function. Our results indicate that the G245S mutation destabilizes several structural regions in the protein that are crucial for DNA binding when found in its apo form and highlight differences in the mutant-DNA complex structure compared to the wt protein. These findings not only provide means that can be applied to other p53 mutants but also serve as structural basis for further studies aimed at the development of cancer therapies based on restoring the function of p53.
Collapse
Affiliation(s)
- Marco Gaetano Lepre
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Torino, Italy.
| | - Sara Ibrahim Omar
- Department of Oncology, University of Alberta, Edmonton, AB T6G 2R3, Canada.
| | - Gianvito Grasso
- Istituto Dalle Molle di studi sull'Intelligenza Artificiale (IDSIA), Scuola universitaria professionale della Svizzera italiana (SUPSI), Università della Svizzera italiana (USI), Centro Galleria 2, CH-6928 Manno, Switzerland.
| | - Umberto Morbiducci
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Torino, Italy.
| | - Marco Agostino Deriu
- Department of Mechanical and Aerospace Engineering, Politecnico di Torino, 10129 Torino, Italy.
- Istituto Dalle Molle di studi sull'Intelligenza Artificiale (IDSIA), Scuola universitaria professionale della Svizzera italiana (SUPSI), Università della Svizzera italiana (USI), Centro Galleria 2, CH-6928 Manno, Switzerland.
| | - Jack A Tuszynski
- Department of Oncology, Department of Physics, University of Alberta, Edmonton, AB T6G 2R3, Canada.
| |
Collapse
|
38
|
Sakaguchi T, Janairo JIB, Lussier-Price M, Wada J, Omichinski JG, Sakaguchi K. Oligomerization enhances the binding affinity of a silver biomineralization peptide and catalyzes nanostructure formation. Sci Rep 2017; 7:1400. [PMID: 28469202 PMCID: PMC5431226 DOI: 10.1038/s41598-017-01442-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Accepted: 03/28/2017] [Indexed: 01/27/2023] Open
Abstract
Binding affinity and specificity are crucial factors that influence nanostructure control by biomineralization peptides. In this paper, we analysed the role that the oligomeric state of a silver biomineralization peptide plays in regulating the morphology of silver nanostructure formation. Oligomerization was achieved by conjugating the silver specific TBP biomineralization peptide to the p53 tetramerization domain peptide (p53Tet). Interestingly, the TBP-p53Tet tetrameric peptide acted as a growth catalyst, controlling silver crystal growth, which resulted in the formation of hexagonal silver nanoplates without consuming the peptide. The TBP-p53Tet peptide caps the surface of the silver crystals, which enhances crystal growth on specific faces and thereby regulates silver nanostructure formation in a catalytic fashion. The present findings not only provide an efficient strategy for controlling silver nanostructure formation by biomineralization peptides, but they also demonstrate that in this case the oligomeric peptides play a unique catalytic role.
Collapse
Affiliation(s)
- Tatsuya Sakaguchi
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Jose Isagani B Janairo
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Mathieu Lussier-Price
- Département de Biochimie et Médicine Moléculaire, Université de Montréal, C.P. 6128 Succursale Centre-Ville, Montréal, QC, H3C 3J7, Canada
| | - Junya Wada
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - James G Omichinski
- Département de Biochimie et Médicine Moléculaire, Université de Montréal, C.P. 6128 Succursale Centre-Ville, Montréal, QC, H3C 3J7, Canada
| | - Kazuyasu Sakaguchi
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan.
| |
Collapse
|
39
|
Kamada R, Nakagawa N, Oyama T, Sakaguchi K. Heterochiral Jun and Fos bZIP peptides form a coiled-coil heterodimer that is competent for DNA binding. J Pept Sci 2017; 23:644-649. [PMID: 28185384 DOI: 10.1002/psc.2985] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2016] [Revised: 01/11/2017] [Accepted: 01/28/2017] [Indexed: 12/25/2022]
Abstract
Coiled coils, consisting of at least two α-helices, have important roles in the regulation of transcription, cell differentiation, and cell growth. Peptides composed of d-amino acids (d-peptides) have received great attention for their potential in biomedical applications, because they give large diversity for the design of peptidyl drug and are more resistant to proteolytic digestion than l-peptides. However, the interactions between l-peptides/l-protein and d-peptides in the formation of complex are poorly understood. In this study, stereoisomer-specific peptides were constructed corresponding to regions of the basic-leucine-zipper domains of Jun and Fos proteins. basic-leucine-zipper domains consist of an N-terminal basic domain, which is responsible for DNA binding, and a C-terminal domain that enables homodimerization or heterodimerization via formation of a coiled-coil. By combining peptides with different stereochemistries, the d-l heterochiral Jun-Fos heterodimer formation induced DNA binding by the basic domains of Jun-Fos. Our study provides new insight into the interaction between l-peptide and d-peptide enantiomers for developing d-peptide materials and drugs. Copyright © 2017 European Peptide Society and John Wiley & Sons, Ltd.
Collapse
Affiliation(s)
- Rui Kamada
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Natsumi Nakagawa
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Taiji Oyama
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Kazuyasu Sakaguchi
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| |
Collapse
|
40
|
Kamada R, Toguchi Y, Nomura T, Imagawa T, Sakaguchi K. Tetramer formation of tumor suppressor protein p53: Structure, function, and applications. Biopolymers 2017; 106:598-612. [PMID: 26572807 DOI: 10.1002/bip.22772] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 10/22/2015] [Accepted: 11/02/2015] [Indexed: 01/10/2023]
Abstract
Tetramer formation of p53 is essential for its tumor suppressor function. p53 not only acts as a tumor suppressor protein by inducing cell cycle arrest and apoptosis in response to genotoxic stress, but it also regulates other cellular processes, including autophagy, stem cell self-renewal, and reprogramming of differentiated cells into stem cells, immune system, and metastasis. More than 50% of human tumors have TP53 gene mutations, and most of them are missense mutations that presumably reduce tumor suppressor activity of p53. This review focuses on the role of the tetramerization (oligomerization), which is modulated by the protein concentration of p53, posttranslational modifications, and/or interactions with its binding proteins, in regulating the tumor suppressor function of p53. Functional control of p53 by stabilizing or inhibiting oligomer formation and its bio-applications are also discussed. © 2015 Wiley Periodicals, Inc. Biopolymers (Pept Sci) 106: 598-612, 2016.
Collapse
Affiliation(s)
- Rui Kamada
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Yu Toguchi
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Takao Nomura
- Center for Research and Education on Drug Discovery, Faculty of Pharmaceutical Sciences, Hokkaido University, Sapporo, 060-0812, Japan
| | - Toshiaki Imagawa
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| | - Kazuyasu Sakaguchi
- Laboratory of Biological Chemistry, Department of Chemistry, Faculty of Science, Hokkaido University, Sapporo, 060-0810, Japan
| |
Collapse
|
41
|
Pfister NT, Prives C. Transcriptional Regulation by Wild-Type and Cancer-Related Mutant Forms of p53. Cold Spring Harb Perspect Med 2017; 7:cshperspect.a026054. [PMID: 27836911 DOI: 10.1101/cshperspect.a026054] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
TP53 missense mutations produce a mutant p53 protein that cannot activate the p53 tumor suppressive transcriptional response, which is the primary selective pressure for TP53 mutation. Specific codons of TP53, termed hotspot mutants, are mutated at elevated frequency. Hotspot forms of mutant p53 possess oncogenic properties in addition to being deficient in tumor suppression. Such p53 mutants accumulate to high levels in the cells they inhabit, causing transcriptional alterations that produce pro-oncogenic activities, such as increased pro-growth signaling, invasiveness, and metastases. These forms of mutant p53 very likely use features of wild-type p53, such as interactions with the transcriptional machinery, to produce oncogenic effects. In this review, we discuss commonalities between wild-type and mutant p53 proteins with an emphasis on transcriptional processes.
Collapse
Affiliation(s)
- Neil T Pfister
- Department of Biological Sciences, Columbia University, New York, New York 10027
| | - Carol Prives
- Department of Biological Sciences, Columbia University, New York, New York 10027
| |
Collapse
|
42
|
Anwar D, Takahashi H, Watanabe M, Suzuki M, Fukuda S, Hatakeyama S. p53 represses the transcription of snRNA genes by preventing the formation of little elongation complex. BIOCHIMICA ET BIOPHYSICA ACTA-GENE REGULATORY MECHANISMS 2016; 1859:975-82. [PMID: 27268141 DOI: 10.1016/j.bbagrm.2016.06.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2016] [Revised: 05/12/2016] [Accepted: 06/02/2016] [Indexed: 12/11/2022]
Abstract
The regulation of transcription by RNA polymerase II (Pol II) is important for a variety of cellular functions. ELL/EAF-containing little elongation complex (LEC) was found to be required for transcription of Pol II-dependent small nuclear RNA (snRNA) genes. It was shown that the tumor suppressor p53 interacts with ELL and inhibits transcription elongation activity of ELL. Here, we show that p53 inhibits interaction between ELL/EAF and ICE1 in LEC and thereby p53 represses transcription of Pol II-dependent snRNA genes through inhibiting LEC function. Furthermore, induction of p53 expression by ultraviolet (UV) irradiation decreases the occupancy of ICE1 at Pol II-dependent snRNA genes. Consistent with the results, knockdown of p53 increased both the expression of snRNA genes and the occupancy of Pol II and components of LEC at snRNA genes. Our results indicate that p53 interferes with the interaction between ELL/EAF and ICE1 and represses transcription of snRNA genes by Pol II.
Collapse
Affiliation(s)
- Delnur Anwar
- Department of Biochemistry, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan; Department of Otolaryngology, Head & Neck Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan
| | - Hidehisa Takahashi
- Department of Biochemistry, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan
| | - Masashi Watanabe
- Department of Biochemistry, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan
| | - Masanobu Suzuki
- Department of Biochemistry, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan; Department of Otolaryngology, Head & Neck Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan
| | - Satoshi Fukuda
- Department of Otolaryngology, Head & Neck Surgery, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan
| | - Shigetsugu Hatakeyama
- Department of Biochemistry, Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido 060-8638, Japan.
| |
Collapse
|
43
|
Wada J, Miyazaki H, Kamada R, Sakaguchi K. Quantitative Correlation between the Protein Expression Level in Escherichia Coliand Thermodynamic Stability of Protein In Vitro. CHEM LETT 2016. [DOI: 10.1246/cl.151019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Junya Wada
- Department of Chemistry, Faculty of Science, Hokkaido University
| | | | - Rui Kamada
- Department of Chemistry, Faculty of Science, Hokkaido University
| | | |
Collapse
|
44
|
Artificial regulation of p53 function by modulating its assembly. Biochem Biophys Res Commun 2015; 467:322-7. [DOI: 10.1016/j.bbrc.2015.09.162] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Accepted: 09/30/2015] [Indexed: 11/22/2022]
|
45
|
Parkinson-causing α-synuclein missense mutations shift native tetramers to monomers as a mechanism for disease initiation. Nat Commun 2015; 6:7314. [PMID: 26076669 PMCID: PMC4490410 DOI: 10.1038/ncomms8314] [Citation(s) in RCA: 221] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 04/27/2015] [Indexed: 12/20/2022] Open
Abstract
β-Sheet-rich α-synuclein (αS) aggregates characterize Parkinson's disease (PD). αS was long believed to be a natively unfolded monomer, but recent work suggests it also occurs in α-helix-rich tetramers. Crosslinking traps principally tetrameric αS in intact normal neurons, but not after cell lysis, suggesting a dynamic equilibrium. Here we show that freshly biopsied normal human brain contains abundant αS tetramers. The PD-causing mutation A53T decreases tetramers in mouse brain. Neurons derived from an A53T patient have decreased tetramers. Neurons expressing E46K do also, and adding 1-2 E46K-like mutations into the canonical αS repeat motifs (KTKEGV) further reduces tetramers, decreases αS solubility and induces neurotoxicity and round inclusions. The other three fPD missense mutations likewise decrease tetramer:monomer ratios. The destabilization of physiological tetramers by PD-causing missense mutations and the neurotoxicity and inclusions induced by markedly decreasing tetramers suggest that decreased α-helical tetramers and increased unfolded monomers initiate pathogenesis. Tetramer-stabilizing compounds should prevent this.
Collapse
|
46
|
From local to global changes in proteins: a network view. Curr Opin Struct Biol 2015; 31:1-8. [DOI: 10.1016/j.sbi.2015.02.015] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 02/15/2015] [Accepted: 02/26/2015] [Indexed: 02/01/2023]
|
47
|
Leroy B, Anderson M, Soussi T. TP53 mutations in human cancer: database reassessment and prospects for the next decade. Hum Mutat 2014; 35:672-88. [PMID: 24665023 DOI: 10.1002/humu.22552] [Citation(s) in RCA: 256] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Accepted: 03/04/2014] [Indexed: 12/18/2022]
Abstract
More than 50% of human tumors carry TP53 gene mutations and in consequence more than 45,000 somatic and germline mutations have been gathered in the UMD TP53 database (http://p53.fr). Analyses of these mutations have been invaluable for bettering our knowledge on the structure-function relationships within the TP53 protein and the high degree of heterogeneity of the various TP53 mutants in human cancer. In this review, we discuss how with the release of the sequences of thousands of tumor genomes issued from high-throughput sequencing, the description of novel TP53 mutants is now reaching a plateau indicating that we are close to the full set of mutants that target the elusive tumor-suppressive activity of this protein. We performed an extensive and thorough analysis of the TP53 mutation database, focusing particularly on specific sets of mutations that were overlooked in the past because of their low frequencies, for example, synonymous mutations, splice mutations, or mutations-targeting residues subject to posttranslational modifications. We also discuss the evolution of the statistical methods used to differentiate TP53 passenger mutations and artifactual data from true mutations, a process vital to the release of an accurate TP53 mutation database that will in turn be an invaluable tool for both clinicians and researchers.
Collapse
Affiliation(s)
- Bernard Leroy
- Université Pierre et Marie Curie-Paris 6, Paris, 75005, France
| | | | | |
Collapse
|
48
|
Dixit U, Liu Z, Pandey AK, Kothari R, Pandey VN. Fuse binding protein antagonizes the transcription activity of tumor suppressor protein p53. BMC Cancer 2014; 14:925. [PMID: 25487856 PMCID: PMC4295397 DOI: 10.1186/1471-2407-14-925] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Accepted: 12/01/2014] [Indexed: 01/03/2023] Open
Abstract
Background FUSE binding protein1 (FBP1) is a transactivator of transcription of human c-myc proto-oncogene and expressed mainly in undifferentiated cells. It is also present in differentiated normal cells albeit with very low background. FBP1 is abundantly expressed in the majority of hepatocellular carcinoma tumors and has been implicated in tumor development. Although it down-regulates the expression of proapoptotic p21 protein, it is not known whether FBP1 also interacts and antagonizes the function of tumor suppressor protein p53. Methods Western blotting was carried out to detect the expression level of FBP1, p21 and p53, and also p53 regulatory factors, BCCIP and TCTP; real-time quantitative PCR was done to determine the fold change in mRNA levels of target proteins; immunoprecipitation was carried out to determine the interaction of FBP1 with p53, BCCIP and TCTP. Cells stably knockdown for either FBP1; p53 or BCCIP were examined for p53 reporter activity under normal and radiation-induced stress. Results FBP1 physically interacted with p53, impairing its transcription activity and reducing p53-mediated sensitivity to cellular stress. Knockdown of FBP1 expression activated p53-mediated response to cellular stress while transient expression of FBP1 in FBP-knockdown cells restored the inhibition of p53 activity. FBP1 not only interacted with both BCCIP and TCTP, which, respectively, function as positive and negative regulators of p53, but also regulated their expression under cellular stress. In FBP knockdown cells, TCTP expression was down-regulated under radiation-induced stress whereas expression of BCCIP and p21 were significantly up-regulated suggesting FBP1 as a potential regulator of these proteins. We hypothesize that the FBP1-mediated suppression of p53 activity may occur via preventing the interaction of p53 with BCCIP as well as by FBP1-mediated regulation of p53 regulatory proteins, TCTP and BCCIP. Since FBP1 suppresses p53 activity and is overexpressed in most HCC tumors, it may have a possible role in tumorigenesis. Conclusion FBP1 physically interacts with p53, functions as a regulator of p53-regulatory proteins (TCTP and BCCIP), and suppresses p53 transactivation activity under radiation-induced cellular stress. Since it is abundantly expressed in most HCC tumors, it may have implication in tumorigenesis and thus may be a possible target for drug development.
Collapse
Affiliation(s)
| | | | | | | | - Virendra N Pandey
- Department of Microbiology, Biochemistry and Molecular Genetics, New Jersey Medical School, Rutgers Biomedical Health Sciences, Rutgers University, 185 South Orange Avenue, Newark, NJ 07103, USA.
| |
Collapse
|
49
|
Ashworth J, Bernard B, Reynolds S, Plaisier CL, Shmulevich I, Baliga NS. Structure-based predictions broadly link transcription factor mutations to gene expression changes in cancers. Nucleic Acids Res 2014; 42:12973-83. [PMID: 25378323 PMCID: PMC4245936 DOI: 10.1093/nar/gku1031] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2014] [Revised: 10/09/2014] [Accepted: 10/10/2014] [Indexed: 12/24/2022] Open
Abstract
Thousands of unique mutations in transcription factors (TFs) arise in cancers, and the functional and biological roles of relatively few of these have been characterized. Here, we used structure-based methods developed specifically for DNA-binding proteins to systematically predict the consequences of mutations in several TFs that are frequently mutated in cancers. The explicit consideration of protein-DNA interactions was crucial to explain the roles and prevalence of mutations in TP53 and RUNX1 in cancers, and resulted in a higher specificity of detection for known p53-regulated genes among genetic associations between TP53 genotypes and genome-wide expression in The Cancer Genome Atlas, compared to existing methods of mutation assessment. Biophysical predictions also indicated that the relative prevalence of TP53 missense mutations in cancer is proportional to their thermodynamic impacts on protein stability and DNA binding, which is consistent with the selection for the loss of p53 transcriptional function in cancers. Structure and thermodynamics-based predictions of the impacts of missense mutations that focus on specific molecular functions may be increasingly useful for the precise and large-scale inference of aberrant molecular phenotypes in cancer and other complex diseases.
Collapse
Affiliation(s)
| | - Brady Bernard
- Institute for Systems Biology, Seattle, WA 98109, USA
| | | | | | | | | |
Collapse
|
50
|
Further evidence for pathogenicity of the TP53 tetramerization domain mutation p.Arg342Pro in Li–Fraumeni syndrome. Fam Cancer 2014; 14:161-5. [DOI: 10.1007/s10689-014-9754-z] [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]
|