1
|
Righetto GL, Yin Y, Duda DM, Vu V, Szewczyk MM, Zeng H, Li Y, Loppnau P, Mei T, Li YY, Seitova A, Patrick AN, Brazeau JF, Chaudhry C, Barsyte-Lovejoy D, Santhakumar V, Halabelian L. Probing the CRL4 DCAF12 interactions with MAGEA3 and CCT5 di-Glu C-terminal degrons. PNAS NEXUS 2024; 3:pgae153. [PMID: 38665159 PMCID: PMC11044963 DOI: 10.1093/pnasnexus/pgae153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 04/02/2024] [Indexed: 04/28/2024]
Abstract
Damaged DNA-binding protein-1 (DDB1)- and CUL4-associated factor 12 (DCAF12) serves as the substrate recognition component within the Cullin4-RING E3 ligase (CRL4) complex, capable of identifying C-terminal double-glutamic acid degrons to promote the degradation of specific substrates through the ubiquitin proteasome system. Melanoma-associated antigen 3 (MAGEA3) and T-complex protein 1 subunit epsilon (CCT5) proteins have been identified as cellular targets of DCAF12. To further characterize the interactions between DCAF12 and both MAGEA3 and CCT5, we developed a suite of biophysical and proximity-based cellular NanoBRET assays showing that the C-terminal degron peptides of both MAGEA3 and CCT5 form nanomolar affinity interactions with DCAF12 in vitro and in cells. Furthermore, we report here the 3.17 Å cryo-EM structure of DDB1-DCAF12-MAGEA3 complex revealing the key DCAF12 residues responsible for C-terminal degron recognition and binding. Our study provides new insights and tools to enable the discovery of small molecule handles targeting the WD40-repeat domain of DCAF12 for future proteolysis targeting chimera design and development.
Collapse
Affiliation(s)
- Germanna Lima Righetto
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | - Yanting Yin
- Structural and Protein Sciences, Therapeutics Discovery, Janssen Research and Development, Spring House, PA 19044, USA
| | - David M Duda
- Structural and Protein Sciences, Therapeutics Discovery, Janssen Research and Development, Spring House, PA 19044, USA
| | - Victoria Vu
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Magdalena M Szewczyk
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Hong Zeng
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Yanjun Li
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Peter Loppnau
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Tony Mei
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Yen-Yen Li
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Alma Seitova
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
| | - Aaron N Patrick
- Discovery Technology and Molecular Pharmacology, Therapeutics Discovery, Janssen Research and Development, LLC, Welsh and McKean Roads, Spring House, PA 19477, USA
| | - Jean-Francois Brazeau
- Discovery Chemistry, Therapeutics Discovery, Janssen Research and Development, LLC, 3210 Merryfield Row, La Jolla, CA 92121, USA
| | - Charu Chaudhry
- Discovery Technology and Molecular Pharmacology, Therapeutics Discovery, Janssen Research and Development, LLC, Welsh and McKean Roads, Spring House, PA 19477, USA
| | - Dalia Barsyte-Lovejoy
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| | | | - Levon Halabelian
- Structural Genomics Consortium, University of Toronto, Toronto, Ontario M5G 1L7, Canada
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario M5S 1A8, Canada
| |
Collapse
|
2
|
Advani D, Kumar P. Uncovering Cell Cycle Dysregulations and Associated Mechanisms in Cancer and Neurodegenerative Disorders: A Glimpse of Hope for Repurposed Drugs. Mol Neurobiol 2024:10.1007/s12035-024-04130-7. [PMID: 38532240 DOI: 10.1007/s12035-024-04130-7] [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: 12/25/2023] [Accepted: 03/19/2024] [Indexed: 03/28/2024]
Abstract
The cell cycle is the sequence of events orchestrated by a complex network of cell cycle proteins. Unlike normal cells, mature neurons subsist in a quiescent state of the cell cycle, and aberrant cell cycle activation triggers neuronal death accompanied by neurodegeneration. The periodicity of cell cycle events is choreographed by various mechanisms, including DNA damage repair, oxidative stress, neurotrophin activity, and ubiquitin-mediated degradation. Given the relevance of cell cycle processes in cancer and neurodegeneration, this review delineates the overlapping cell cycle events, signaling pathways, and mechanisms associated with cell cycle aberrations in cancer and the major neurodegenerative disorders. We suggest that dysregulation of some common fundamental signaling processes triggers anomalous cell cycle activation in cancer cells and neurons. We discussed the possible use of cell cycle inhibitors for neurodegenerative disorders and described the associated challenges. We propose that a greater understanding of the common mechanisms driving cell cycle aberrations in cancer and neurodegenerative disorders will open a new avenue for the development of repurposed drugs.
Collapse
Affiliation(s)
- Dia Advani
- Molecular Neuroscience and Functional Genomics Laboratory, Department of Biotechnology, Delhi Technological University (Formerly Delhi College of Engineering), Shahbad Daulatpur, Bawana Road, New Delhi, Delhi, 110042, India
| | - Pravir Kumar
- Molecular Neuroscience and Functional Genomics Laboratory, Department of Biotechnology, Delhi Technological University (Formerly Delhi College of Engineering), Shahbad Daulatpur, Bawana Road, New Delhi, Delhi, 110042, India.
| |
Collapse
|
3
|
Galletta BJ, Varadarajan R, Fagerstrom CJ, Yang B, Haase KP, McJunkin K, Rusan NM. The E3 ligase Poe promotes Pericentrin degradation. Mol Biol Cell 2023; 34:br15. [PMID: 37342879 PMCID: PMC10398894 DOI: 10.1091/mbc.e22-11-0534] [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: 11/29/2022] [Revised: 06/07/2023] [Accepted: 06/13/2023] [Indexed: 06/23/2023] Open
Abstract
Centrosomes are essential parts of diverse cellular processes, and precise regulation of the levels of their constituent proteins is critical for their function. One such protein is Pericentrin (PCNT) in humans and Pericentrin-like protein (PLP) in Drosophila. Increased PCNT expression and its protein accumulation are linked to clinical conditions including cancer, mental disorders, and ciliopathies. However, the mechanisms by which PCNT levels are regulated remain underexplored. Our previous study demonstrated that PLP levels are sharply down-regulated during early spermatogenesis and this regulation is essential to spatially position PLP on the proximal end of centrioles. We hypothesized that the sharp drop in PLP protein was a result of rapid protein degradation during the male germ line premeiotic G2 phase. Here, we show that PLP is subject to ubiquitin-mediated degradation and identify multiple proteins that promote the reduction of PLP levels in spermatocytes, including the UBR box containing E3 ligase Poe (UBR4), which we show binds to PLP. Although protein sequences governing posttranslational regulation of PLP are not restricted to a single region of the protein, we identify a region that is required for Poe-mediated degradation. Experimentally stabilizing PLP, via internal PLP deletions or loss of Poe, leads to PLP accumulation in spermatocytes, its mispositioning along centrioles, and defects in centriole docking in spermatids.
Collapse
Affiliation(s)
- Brian J. Galletta
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, and
| | - Ramya Varadarajan
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, and
| | - Carey J. Fagerstrom
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, and
| | - Bing Yang
- Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Karen Plevock Haase
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, and
| | - Katherine McJunkin
- Laboratory of Cellular and Developmental Biology, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, MD 20892
| | - Nasser M. Rusan
- Cell and Developmental Biology Center, National Heart, Lung, and Blood Institute, and
| |
Collapse
|
4
|
Manzoor H, Zahid H, Emerling CA, Kumar KR, Hussain HMJ, Seo GH, Wajid M, Naz S. A biallelic variant of DCAF13 implicated in a neuromuscular disorder in humans. Eur J Hum Genet 2023; 31:629-637. [PMID: 36797467 PMCID: PMC10250411 DOI: 10.1038/s41431-023-01319-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 02/05/2023] [Accepted: 02/09/2023] [Indexed: 02/18/2023] Open
Abstract
Neuromuscular disorders encompass a broad range of phenotypes and genetic causes. We investigated a consanguineous family in which multiple patients had a neuromuscular disorder characterized by a waddling gait, limb deformities, muscular weakness and facial palsy. Exome sequencing was completed on the DNA of three of the four patients. We identified a novel missense variant in DCAF13, ENST00000612750.5, NM_015420.7, c.907 G > A;p.(Asp303Asn), ENST00000616836.4, NM_015420.6, c.1363 G > A:p.(Asp455Asn) (rs1209794872) segregating with this phenotype; being homozygous in all four affected patients and heterozygous in the unaffected individuals. The variant was extremely rare in the public databases (gnomAD allele frequency 0.000007081); was absent from the DNA of 300 ethnically matched controls and affected an amino acid which has been conserved across 1-2 billion years of evolution in eukaryotes. DCAF13 contains three WD40 domains and is hypothesized to have roles in both rRNA processing and in ubiquitination of proteins. Analysis of DCAF13 with the p.(Asp455Asn) variant predicted that the amino acid change is deleterious and affects a β-hairpin turn, within a WD40 domain of the protein which may decrease protein stability. Previously, a heterozygous variant of DCAF13 NM_015420.6, c.20 G > C:p.(Trp7Ser) with or without a heterozygous missense variant in CCN3, was suggested to cause inherited cortical myoclonic tremor with epilepsy. In addition, a heterozygous DCAF13 variant has been associated with autism spectrum disorder. Our study indicates a potential role of biallelic DCAF13 variants in neuromuscular disorders. Screening of additional patients with similar phenotype may broaden the allelic and phenotypic spectrum due to DCAF13 variants.
Collapse
Affiliation(s)
- Humera Manzoor
- School of Biological Sciences, University of the Punjab, Quaid-e-Azam Campus, Lahore, 54590, Pakistan
- Department of Human Genetics and Molecular Biology, University of Health Sciences, Lahore, Pakistan
| | - Hafsa Zahid
- School of Biological Sciences, University of the Punjab, Quaid-e-Azam Campus, Lahore, 54590, Pakistan
| | | | - Kishore R Kumar
- Molecular Medicine Laboratory and Department of Neurology, Concord Repatriation General Hospital, Concord Clinical School Faculty of Medicine and Health, University of Sydney, Sydney, NSW, Australia
- Kinghorn Centre for Clinical Genomics, Garvan Institute of Medical Research, Darlinghurst, NSW, Australia
| | | | | | - Muhammad Wajid
- Department of Zoology, University of Okara, Punjab, Pakistan
| | - Sadaf Naz
- School of Biological Sciences, University of the Punjab, Quaid-e-Azam Campus, Lahore, 54590, Pakistan.
| |
Collapse
|
5
|
Pla‐Prats C, Cavadini S, Kempf G, Thomä NH. Recognition of the CCT5 di-Glu degron by CRL4 DCAF12 is dependent on TRiC assembly. EMBO J 2023; 42:e112253. [PMID: 36715408 PMCID: PMC9929631 DOI: 10.15252/embj.2022112253] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 10/21/2022] [Accepted: 12/14/2022] [Indexed: 01/31/2023] Open
Abstract
Assembly Quality Control (AQC) E3 ubiquitin ligases target incomplete or incorrectly assembled protein complexes for degradation. The CUL4-RBX1-DDB1-DCAF12 (CRL4DCAF12 ) E3 ligase preferentially ubiquitinates proteins that carry a C-terminal double glutamate (di-Glu) motif. Reported CRL4DCAF12 di-Glu-containing substrates include CCT5, a subunit of the TRiC chaperonin. How DCAF12 engages its substrates and the functional relationship between CRL4DCAF12 and CCT5/TRiC is currently unknown. Here, we present the cryo-EM structure of the DDB1-DCAF12-CCT5 complex at 2.8 Å resolution. DCAF12 serves as a canonical WD40 DCAF substrate receptor and uses a positively charged pocket at the center of the β-propeller to bind the C-terminus of CCT5. DCAF12 specifically reads out the CCT5 di-Glu side chains, and contacts other visible degron amino acids through Van der Waals interactions. The CCT5 C-terminus is inaccessible in an assembled TRiC complex, and functional assays demonstrate that DCAF12 binds and ubiquitinates monomeric CCT5, but not CCT5 assembled into TRiC. Our biochemical and structural results suggest a previously unknown role for the CRL4DCAF12 E3 ligase in overseeing the assembly of a key cellular complex.
Collapse
Affiliation(s)
- Carlos Pla‐Prats
- Friedrich Miescher Institute for Biomedical ResearchBaselSwitzerland
- University of BaselBaselSwitzerland
| | - Simone Cavadini
- Friedrich Miescher Institute for Biomedical ResearchBaselSwitzerland
| | - Georg Kempf
- Friedrich Miescher Institute for Biomedical ResearchBaselSwitzerland
| | - Nicolas H Thomä
- Friedrich Miescher Institute for Biomedical ResearchBaselSwitzerland
| |
Collapse
|
6
|
Nong W, Huang F, Mao F, Lao D, Gong Z, Huang W. DCAF12 and HSPA1A May Serve as Potential Diagnostic Biomarkers for Myasthenia Gravis. BIOMED RESEARCH INTERNATIONAL 2022; 2022:8587273. [PMID: 35655486 PMCID: PMC9155969 DOI: 10.1155/2022/8587273] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Accepted: 05/11/2022] [Indexed: 12/20/2022]
Abstract
Background Myasthenia gravis (MG) is an autoimmune disease that severely affects the life quality of patients. This study explores the differences in immune cell types between MG and healthy control and the role of immune-related genes in the diagnosis of MG. Methods The GSE85452 dataset was downloaded from the Gene Expression Omnibus (GEO) database and analyzed using the limma package to determine differentially expressed genes (DEGs) between patients with MG and the control group. Differentially expressed immune cells were analyzed using single-sample gene set enrichment analysis (GSEA), while immune cell-associated modules were identified by weighted gene coexpression network analysis (WGCNA). Then, the expression of the identified hub genes was confirmed by RT-PCR in peripheral blood mononuclear cells (PBMCs) of MG patients. The R package pROC was used to plot the receiver operating characteristics (ROC) curves. Results The modules related to CD56bright natural killer cells were identified by GSEA and WGCNA. The proportion of CD56bright natural killer cells in the peripheral blood of MG patients is low. The results of RT-PCR showed that the levels of DDB1- and CUL4-associated factor 12 (DCAF12) and heat shock protein family A member 1A (HSPA1A) were significantly decreased in peripheral blood mononuclear cells of MG patients compared with healthy controls. The ROC curve results of DCAF12 and HSPA1A mRNA in MG diagnosis were 0.780 and 0.830, respectively. Conclusions CD56bright NK cell is lower in MG patients and may affect MG occurrence. DCAF12 and HSPA1A are lowly expressed in PBMCs of MG patients and may serve as the diagnostic biomarkers of MG.
Collapse
Affiliation(s)
- Weidong Nong
- Department of Neurology, First Affiliated Hospital, Guangxi Medical University, Nanning, China 530021
| | - Fang Huang
- Department of Neurology, First Affiliated Hospital, Guangxi Medical University, Nanning, China 530021
| | - Fengping Mao
- Department of Neurology, First Affiliated Hospital, Guangxi Medical University, Nanning, China 530021
| | - Dayuan Lao
- Department of Neurology, First Affiliated Hospital, Guangxi Medical University, Nanning, China 530021
| | - Zhuowei Gong
- Department of Neurology, First Affiliated Hospital, Guangxi Medical University, Nanning, China 530021
| | - Wen Huang
- Department of Neurology, First Affiliated Hospital, Guangxi Medical University, Nanning, China 530021
| |
Collapse
|
7
|
DCAF12 promotes apoptosis and inhibits NF-κB activation by acting as an endogenous antagonist of IAPs. Oncogene 2022; 41:3000-3010. [PMID: 35459779 DOI: 10.1038/s41388-022-02319-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 04/05/2022] [Accepted: 04/07/2022] [Indexed: 11/08/2022]
Abstract
Members of the Inhibitor of Apoptosis Protein (IAP) family are essential for cell survival and appear to neutralize the cell death machinery by binding pro-apoptotic caspases. dcaf12 was recently identified as an apoptosis regulator in Drosophila. However, the underlying molecular mechanisms are unknown. Here we revealed that human DCAF12 homolog binds multiple IAPs, including XIAP, cIAP1, cIAP2, and BRUCE, through recognition of BIR domains in IAPs. The pro-apoptotic function of DCAF12 is dependent on its capacity to bind IAPs. In response to apoptotic stimuli, DCAF12 translocates from the nucleus to the cytoplasm, where it blocks the interaction between XIAP and pro-apoptotic caspases to facilitate caspase activation and apoptosis execution. Similarly, DCAF12 suppresses NF-κB activation in an IAP binding-dependent manner. Moreover, DCAF12 acts as a tumor suppressor to restrict the malignant phenotypes of cancer cells. Together, our results suggest that DCAF12 is an evolutionarily conserved IAP antagonist.
Collapse
|
8
|
Confettura AD, Cuboni E, Ammar MR, Jia S, Gomes GM, Yuanxiang P, Raman R, Li T, Grochowska KM, Ahrends R, Karpova A, Dityatev A, Kreutz MR. Neddylation-dependent protein degradation is a nexus between synaptic insulin resistance, neuroinflammation and Alzheimer's disease. Transl Neurodegener 2022; 11:2. [PMID: 34986876 PMCID: PMC8734066 DOI: 10.1186/s40035-021-00277-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Accepted: 12/24/2021] [Indexed: 12/13/2022] Open
Abstract
BACKGROUND The metabolic syndrome is a consequence of modern lifestyle that causes synaptic insulin resistance and cognitive deficits and that in interaction with a high amyloid load is an important risk factor for Alzheimer's disease. It has been proposed that neuroinflammation might be an intervening variable, but the underlying mechanisms are currently unknown. METHODS We utilized primary neurons to induce synaptic insulin resistance as well as a mouse model of high-risk aging that includes a high amyloid load, neuroinflammation, and diet-induced obesity to test hypotheses on underlying mechanisms. RESULTS We found that neddylation and subsequent activation of cullin-RING ligase complexes induced synaptic insulin resistance through ubiquitylation and degradation of the insulin-receptor substrate IRS1 that organizes synaptic insulin signaling. Accordingly, inhibition of neddylation preserved synaptic insulin signaling and rescued memory deficits in mice with a high amyloid load, which were fed with a 'western diet'. CONCLUSIONS Collectively, the data suggest that neddylation and degradation of the insulin-receptor substrate is a nodal point that links high amyloid load, neuroinflammation, and synaptic insulin resistance to cognitive decline and impaired synaptic plasticity in high-risk aging.
Collapse
Affiliation(s)
| | - Eleonora Cuboni
- RG Neuroplasticity, Leibniz-Institute for Neurobiology, 39118, Magdeburg, Germany
| | - Mohamed Rafeet Ammar
- RG Neuroplasticity, Leibniz-Institute for Neurobiology, 39118, Magdeburg, Germany
| | - Shaobo Jia
- German Center for Neurodegenerative Diseases (DZNE), 39120, Magdeburg, Germany
| | - Guilherme M Gomes
- RG Neuroplasticity, Leibniz-Institute for Neurobiology, 39118, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Otto Von Guericke University, 39120, Magdeburg, Germany
| | - PingAn Yuanxiang
- RG Neuroplasticity, Leibniz-Institute for Neurobiology, 39118, Magdeburg, Germany
| | - Rajeev Raman
- RG Neuroplasticity, Leibniz-Institute for Neurobiology, 39118, Magdeburg, Germany
| | - Tingting Li
- Leibniz-Institut Für Analytische Wissenschaften-ISAS-e.V., 44227, Dortmund, Germany
| | - Katarzyna M Grochowska
- RG Neuroplasticity, Leibniz-Institute for Neurobiology, 39118, Magdeburg, Germany.,Leibniz Group 'Dendritic Organelles and Synaptic Function', Center for Molecular Neurobiology, ZMNH, University Medical Center Hamburg-Eppendorf, 20251, Hamburg, Germany
| | - Robert Ahrends
- Leibniz-Institut Für Analytische Wissenschaften-ISAS-e.V., 44227, Dortmund, Germany.,Department of Analytical Chemistry, Faculty of Chemistry, University of Vienna, 1090, Wien, Austria
| | - Anna Karpova
- RG Neuroplasticity, Leibniz-Institute for Neurobiology, 39118, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Otto Von Guericke University, 39120, Magdeburg, Germany
| | - Alexander Dityatev
- German Center for Neurodegenerative Diseases (DZNE), 39120, Magdeburg, Germany.,Center for Behavioral Brain Sciences, Otto Von Guericke University, 39120, Magdeburg, Germany.,Medical Faculty, Otto-von-Guericke University, 39120, Magdeburg, Germany
| | - Michael R Kreutz
- RG Neuroplasticity, Leibniz-Institute for Neurobiology, 39118, Magdeburg, Germany. .,German Center for Neurodegenerative Diseases (DZNE), 39120, Magdeburg, Germany. .,Center for Behavioral Brain Sciences, Otto Von Guericke University, 39120, Magdeburg, Germany. .,Leibniz Group 'Dendritic Organelles and Synaptic Function', Center for Molecular Neurobiology, ZMNH, University Medical Center Hamburg-Eppendorf, 20251, Hamburg, Germany.
| |
Collapse
|
9
|
Montalbano M, Jaworski E, Garcia S, Ellsworth A, McAllen S, Routh A, Kayed R. Tau Modulates mRNA Transcription, Alternative Polyadenylation Profiles of hnRNPs, Chromatin Remodeling and Spliceosome Complexes. Front Mol Neurosci 2021; 14:742790. [PMID: 34924950 PMCID: PMC8678415 DOI: 10.3389/fnmol.2021.742790] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Accepted: 11/09/2021] [Indexed: 11/13/2022] Open
Abstract
Tau protein is a known contributor in several neurodegenerative diseases, including Alzheimer’s disease (AD) and frontotemporal dementia (FTD). It is well-established that tau forms pathological aggregates and fibrils in these diseases. Tau has been observed within the nuclei of neurons, but there is a gap in understanding regarding the mechanism by which tau modulates transcription. We are interested in the P301L mutation of tau, which has been associated with FTD and increased tau aggregation. Our study utilized tau-inducible HEK (iHEK) cells to reveal that WT and P301L tau distinctively alter the transcription and alternative polyadenylation (APA) profiles of numerous nuclear precursors mRNAs, which then translate to form proteins involved in chromatin remodeling and splicing. We isolated total mRNA before and after over-expressing tau and then performed Poly(A)-ClickSeq (PAC-Seq) to characterize mRNA expression and APA profiles. We characterized changes in Gene Ontology (GO) pathways using EnrichR and Gene Set Enrichment Analysis (GSEA). We observed that P301L tau up-regulates genes associated with reactive oxygen species responsiveness as well as genes involved in dendrite, microtubule, and nuclear body/speckle formation. The number of genes regulated by WT tau is greater than the mutant form, which indicates that the P301L mutation causes loss-of-function at the transcriptional level. WT tau up-regulates genes contributing to cytoskeleton-dependent intracellular transport, microglial activation, microtubule and nuclear chromatin organization, formation of nuclear bodies and speckles. Interestingly, both WT and P301L tau commonly down-regulate genes responsible for ubiquitin-proteosome system. In addition, WT tau significantly down-regulates several genes implicated in chromatin remodeling and nucleosome organization. Although there are limitations inherent to the model systems used, this study will improve understanding regarding the nuclear impact of tau at the transcriptional and post-transcriptional level. This study also illustrates the potential impact of P301L tau on the human brain genome during early phases of pathogenesis.
Collapse
Affiliation(s)
- Mauro Montalbano
- Mitchell Center for Neurodegenerative Diseases, University of Texas Medical Branch, Galveston, TX, United States.,Departments of Neurology, Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, TX, United States
| | - Elizabeth Jaworski
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX, United States
| | - Stephanie Garcia
- Mitchell Center for Neurodegenerative Diseases, University of Texas Medical Branch, Galveston, TX, United States.,Departments of Neurology, Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, TX, United States
| | - Anna Ellsworth
- Mitchell Center for Neurodegenerative Diseases, University of Texas Medical Branch, Galveston, TX, United States.,Departments of Neurology, Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, TX, United States
| | - Salome McAllen
- Mitchell Center for Neurodegenerative Diseases, University of Texas Medical Branch, Galveston, TX, United States.,Departments of Neurology, Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, TX, United States
| | - Andrew Routh
- Department of Biochemistry and Molecular Biology, University of Texas Medical Branch, Galveston, TX, United States.,Sealy Center for Structural Biology and Molecular Biophysics, University of Texas Medical Branch, Galveston, TX, United States
| | - Rakez Kayed
- Mitchell Center for Neurodegenerative Diseases, University of Texas Medical Branch, Galveston, TX, United States.,Departments of Neurology, Neuroscience and Cell Biology, University of Texas Medical Branch, Galveston, TX, United States
| |
Collapse
|
10
|
Lidak T, Baloghova N, Korinek V, Sedlacek R, Balounova J, Kasparek P, Cermak L. CRL4-DCAF12 Ubiquitin Ligase Controls MOV10 RNA Helicase during Spermatogenesis and T Cell Activation. Int J Mol Sci 2021; 22:5394. [PMID: 34065512 PMCID: PMC8161014 DOI: 10.3390/ijms22105394] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2021] [Revised: 05/12/2021] [Accepted: 05/16/2021] [Indexed: 12/27/2022] Open
Abstract
Multisubunit cullin-RING ubiquitin ligase 4 (CRL4)-DCAF12 recognizes the C-terminal degron containing acidic amino acid residues. However, its physiological roles and substrates are largely unknown. Purification of CRL4-DCAF12 complexes revealed a wide range of potential substrates, including MOV10, an "ancient" RNA-induced silencing complex (RISC) complex RNA helicase. We show that DCAF12 controls the MOV10 protein level via its C-terminal motif in a proteasome- and CRL-dependent manner. Next, we generated Dcaf12 knockout mice and demonstrated that the DCAF12-mediated degradation of MOV10 is conserved in mice and humans. Detailed analysis of Dcaf12-deficient mice revealed that their testes produce fewer mature sperms, phenotype accompanied by elevated MOV10 and imbalance in meiotic markers SCP3 and γ-H2AX. Additionally, the percentages of splenic CD4+ T and natural killer T (NKT) cell populations were significantly altered. In vitro, activated Dcaf12-deficient T cells displayed inappropriately stabilized MOV10 and increased levels of activated caspases. In summary, we identified MOV10 as a novel substrate of CRL4-DCAF12 and demonstrated the biological relevance of the DCAF12-MOV10 pathway in spermatogenesis and T cell activation.
Collapse
Affiliation(s)
- Tomas Lidak
- Laboratory of Cancer Biology, Institute of Molecular Genetics of the Czech Academy of Sciences, 252 42 Vestec, Czech Republic; (T.L.); (N.B.); (V.K.)
- Faculty of Science, Charles University, 128 00 Prague, Czech Republic
| | - Nikol Baloghova
- Laboratory of Cancer Biology, Institute of Molecular Genetics of the Czech Academy of Sciences, 252 42 Vestec, Czech Republic; (T.L.); (N.B.); (V.K.)
| | - Vladimir Korinek
- Laboratory of Cancer Biology, Institute of Molecular Genetics of the Czech Academy of Sciences, 252 42 Vestec, Czech Republic; (T.L.); (N.B.); (V.K.)
- Laboratory of Cell and Developmental Biology, Institute of Molecular Genetics of the Czech Academy of Sciences, 252 42 Vestec, Czech Republic
| | - Radislav Sedlacek
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, 252 50 Vestec, Czech Republic; (R.S.); (J.B.); (P.K.)
| | - Jana Balounova
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, 252 50 Vestec, Czech Republic; (R.S.); (J.B.); (P.K.)
| | - Petr Kasparek
- Czech Centre for Phenogenomics, Institute of Molecular Genetics of the Czech Academy of Sciences, 252 50 Vestec, Czech Republic; (R.S.); (J.B.); (P.K.)
| | - Lukas Cermak
- Laboratory of Cancer Biology, Institute of Molecular Genetics of the Czech Academy of Sciences, 252 42 Vestec, Czech Republic; (T.L.); (N.B.); (V.K.)
| |
Collapse
|
11
|
Lee G, Park JH. Programmed cell death reshapes the central nervous system during metamorphosis in insects. CURRENT OPINION IN INSECT SCIENCE 2021; 43:39-45. [PMID: 33065339 PMCID: PMC10754214 DOI: 10.1016/j.cois.2020.09.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2020] [Revised: 09/08/2020] [Accepted: 09/29/2020] [Indexed: 06/11/2023]
Abstract
Metamorphosis is fascinating and dramatic stage of postembryonic development in insects [1]. The most prominent metamorphic changes seen in holometabolous insects involve destruction of most larval structures and concomitant generation of adult ones. Such diverse cellular events are orchestrated by ecdysone. The central nervous system (CNS) is also extensively remodeled to process new sensory inputs; to coordinate new types of locomotion; and to perform higher-order decision making [2]. Programmed cell death (PCD) is an integral part of the metamorphic development. It eliminates obsolete larval tissues and extra cells that are generated from the morphogenesis of adult tissues. In the CNS, PCD of selected neurons and glial cells as well as reshaping of persistent larval cells are essential for establishing the adult CNS. In this review, we summarize the ecdysone signaling, and then molecular and cellular events associated with PCD primarily in the metamorphosing CNS of Drosophila melanogaster.
Collapse
Affiliation(s)
- Gyunghee Lee
- Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville TN 37996, United States
| | - Jae H Park
- Department of Biochemistry and Cellular and Molecular Biology, University of Tennessee, Knoxville TN 37996, United States.
| |
Collapse
|
12
|
Abstract
Cullin-RING ligase 4 (CRL4), a member of the cullin-RING ligase family, orchestrates a variety of critical cellular processes and pathophysiological events. Recent results from mouse genetics, clinical analyses, and biochemical studies have revealed the impact of CRL4 in development and cancer etiology and elucidated its in-depth mechanism on catalysis of ubiquitination as a ubiquitin E3 ligase. Here, we summarize the versatile roles of the CRL4 E3 ligase complexes in tumorigenesis dependent on the evidence obtained from knockout and transgenic mouse models as well as biochemical and pathological studies.
Collapse
|
13
|
Cho YS, Li S, Wang X, Zhu J, Zhuo S, Han Y, Yue T, Yang Y, Jiang J. CDK7 regulates organ size and tumor growth by safeguarding the Hippo pathway effector Yki/Yap/Taz in the nucleus. Genes Dev 2019; 34:53-71. [PMID: 31857346 PMCID: PMC6938674 DOI: 10.1101/gad.333146.119] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2019] [Accepted: 11/25/2019] [Indexed: 01/09/2023]
Abstract
Hippo signaling controls organ size and tumor progression through a conserved pathway leading to nuclear translocation of the transcriptional effector Yki/Yap/Taz. Most of our understanding of Hippo signaling pertains to its cytoplasmic regulation, but how the pathway is controlled in the nucleus remains poorly understood. Here we uncover an evolutionarily conserved mechanism by which CDK7 promotes Yki/Yap/Taz stabilization in the nucleus to sustain Hippo pathway outputs. We found that a modular E3 ubiquitin ligase complex CRL4DCAF12 binds and targets Yki/Yap/Taz for ubiquitination and degradation, whereas CDK7 phosphorylates Yki/Yap/Taz at S169/S128/S90 to inhibit CRL4DCAF12 recruitment, leading to Yki/Yap/Taz stabilization. As a consequence, inactivation of CDK7 reduced organ size and inhibited tumor growth, which could be reversed by restoring Yki/Yap activity. Our study identifies an unanticipated layer of Hippo pathway regulation, defines a novel mechanism by which CDK7 regulates tissue growth, and implies CDK7 as a drug target for Yap/Taz-driven cancer.
Collapse
Affiliation(s)
- Yong Suk Cho
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA
| | - Shuang Li
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA
| | - Xiaohui Wang
- Department of Developmental Biology, Harvard School of Dental Medicine, Boston, Massachusetts 02215, USA.,Harvard Stem Cell Institute, Boston, Massachusetts 02215, USA
| | - Jian Zhu
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA
| | - Shu Zhuo
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA
| | - Yuhong Han
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA
| | - Tao Yue
- Center for the Genetics and Host Defense, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA
| | - Yingzi Yang
- Department of Developmental Biology, Harvard School of Dental Medicine, Boston, Massachusetts 02215, USA.,Harvard Stem Cell Institute, Boston, Massachusetts 02215, USA
| | - Jin Jiang
- Department of Molecular Biology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA.,Department of Pharmacology, University of Texas Southwestern Medical Center, Dallas, Texas 75390, USA
| |
Collapse
|