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Dai Z, Li D, Du X, Ge Y, Hursh DA, Bi X. Drosophila Caliban preserves intestinal homeostasis and lifespan through regulating mitochondrial dynamics and redox state in enterocytes. PLoS Genet 2020; 16:e1009140. [PMID: 33057338 PMCID: PMC7591072 DOI: 10.1371/journal.pgen.1009140] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Revised: 10/27/2020] [Accepted: 09/03/2020] [Indexed: 02/06/2023] Open
Abstract
Precise regulation of stem cell activity is crucial for tissue homeostasis. In Drosophila, intestinal stem cells (ISCs) maintain the midgut epithelium and respond to oxidative challenges. However, the connection between intestinal homeostasis and redox signaling remains obscure. Here we find that Caliban (Clbn) functions as a regulator of mitochondrial dynamics in enterocytes (ECs) and is required for intestinal homeostasis. The clbn knock-out flies have a shortened lifespan and lose the intestinal homeostasis. Clbn is highly expressed and localizes to the outer membrane of mitochondria in ECs. Mechanically, Clbn mediates mitochondrial dynamics in ECs and removal of clbn leads to mitochondrial fragmentation, accumulation of reactive oxygen species, ECs damage, activation of JNK and JAK-STAT signaling pathways. Moreover, multiple mitochondria-related genes are differentially expressed between wild-type and clbn mutated flies by a whole-genome transcriptional profiling. Furthermore, loss of clbn promotes tumor growth in gut generated by activated Ras in intestinal progenitor cells. Our findings reveal an EC-specific function of Clbn in regulating mitochondrial dynamics, and provide new insight into the functional link among mitochondrial redox modulation, tissue homeostasis and longevity.
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Affiliation(s)
- Zhaoxia Dai
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Dong Li
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- School of Medicine, Nantong University, Nantong, China
- * E-mail: (DL); (XB)
| | - Xiao Du
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
- School of Medicine, Nantong University, Nantong, China
| | - Ying Ge
- The Second Affiliated Hospital, Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Deborah A. Hursh
- Division of Cellular and Gene Therapies, Office of Tissues and Advanced Therapies, Center for Biologics Evaluation and Research, U.S. Food and Drug Administration, Silver Spring, Maryland, United States of America
| | - Xiaolin Bi
- School of Medicine, Nantong University, Nantong, China
- College of Basic Medical Sciences, Dalian Medical University, Dalian, China
- * E-mail: (DL); (XB)
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Wu Z, Tantray I, Lim J, Chen S, Li Y, Davis Z, Sitron C, Dong J, Gispert S, Auburger G, Brandman O, Bi X, Snyder M, Lu B. MISTERMINATE Mechanistically Links Mitochondrial Dysfunction with Proteostasis Failure. Mol Cell 2019; 75:835-848.e8. [PMID: 31378462 DOI: 10.1016/j.molcel.2019.06.031] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 06/04/2019] [Accepted: 06/21/2019] [Indexed: 10/26/2022]
Abstract
Mitochondrial dysfunction and proteostasis failure frequently coexist as hallmarks of neurodegenerative disease. How these pathologies are related is not well understood. Here, we describe a phenomenon termed MISTERMINATE (mitochondrial-stress-induced translational termination impairment and protein carboxyl terminal extension), which mechanistically links mitochondrial dysfunction with proteostasis failure. We show that mitochondrial dysfunction impairs translational termination of nuclear-encoded mitochondrial mRNAs, including complex-I 30kD subunit (C-I30) mRNA, occurring on the mitochondrial surface in Drosophila and mammalian cells. Ribosomes stalled at the normal stop codon continue to add to the C terminus of C-I30 certain amino acids non-coded by mRNA template. C-terminally extended C-I30 is toxic when assembled into C-I and forms aggregates in the cytosol. Enhancing co-translational quality control prevents C-I30 C-terminal extension and rescues mitochondrial and neuromuscular degeneration in a Parkinson's disease model. These findings emphasize the importance of efficient translation termination and reveal unexpected link between mitochondrial health and proteome homeostasis mediated by MISTERMINATE.
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Affiliation(s)
- Zhihao Wu
- Department of Pathology and Programs in Cancer Biology and Neurosciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Ishaq Tantray
- Department of Pathology and Programs in Cancer Biology and Neurosciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Junghyun Lim
- Department of Pathology and Programs in Cancer Biology and Neurosciences, Stanford University School of Medicine, Stanford, CA, USA; Department of Cancer Biology, Genentech Inc., South San Francisco, CA, USA
| | - Songjie Chen
- Department of Genetics, Stanford University School of Medicine, Stanford, CA, USA
| | - Yu Li
- Department of Pathology and Programs in Cancer Biology and Neurosciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Zoe Davis
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA, USA
| | - Cole Sitron
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA, USA
| | - Jason Dong
- Department of Pathology and Programs in Cancer Biology and Neurosciences, Stanford University School of Medicine, Stanford, CA, USA
| | - Suzana Gispert
- Experimental Neurology, Goethe University Medical School, Goethe, Germany
| | - Georg Auburger
- Experimental Neurology, Goethe University Medical School, Goethe, Germany
| | - Onn Brandman
- Department of Biochemistry, Stanford University School of Medicine, Stanford, CA, USA
| | - Xiaolin Bi
- Institute of Cancer Stem Cell, Dalian Medical University, Dalian, China
| | - Michael Snyder
- Department of Genetics, Stanford University School of Medicine, Stanford, CA, USA
| | - Bingwei Lu
- Department of Pathology and Programs in Cancer Biology and Neurosciences, Stanford University School of Medicine, Stanford, CA, USA.
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Song F, Li D, Wang Y, Bi X. Drosophila Caliban mediates G1-S transition and ionizing radiation induced S phase checkpoint. Cell Cycle 2018; 17:2256-2267. [PMID: 30231800 DOI: 10.1080/15384101.2018.1524237] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
Abstract
Cell cycle progression is precisely regulated by diverse extrinsic and intrinsic cellular factors. Understanding the underlying mechanisms of cell cycle regulation is essential to address how normal development and tissue homeostasis are achieved. Here, we present a novel cell cycle regulator Caliban (Clbn), the Drosophila ortholog of human Serologically defined colon cancer antigen 1 (SDCCAG1) gene. We show that ionizing radiation induces expression of clbn, and over-expression of clbn blocks G1-to-S cell cycle transition in Drosophila, while flies loss of clbn have defective S phase checkpoint in response to irradiation. Mechanistically, induced expression of clbn suppressed E2F1 activity and down-regulates the DNA replication and expression of its downstream target cyclin E, a key regulator of G1-to-S transition. Meanwhile, clbn over-expression leads to upregulation of the CDK inhibitor Dacapo (Dap), and upregulated Dap is decreased when e2f1 is over-expressed. Furthermore, expression of clbn is down-regulated in cells with e2f1 over-expression or rbf1 knockdown, indicating that Clbn and E2F1 act antagonistically in mediating G1-to-S transition. Thus we provide genetic evidence that Clbn works together with E2F1 in regulating cell cycle progression, and Clbn is required for S phase cell cycle checkpoint in response to DNA damage.
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Affiliation(s)
- Fanghua Song
- a Department of Biological Sciences, College of Basic Medical Sciences , Dalian Medical University , Dalian , China.,b Institute of Cancer Stem Cell, Cancer Center , Dalian Medical University , Dalian , China
| | - Dong Li
- a Department of Biological Sciences, College of Basic Medical Sciences , Dalian Medical University , Dalian , China.,b Institute of Cancer Stem Cell, Cancer Center , Dalian Medical University , Dalian , China
| | - Yajie Wang
- c Key Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry of Education, School of Pharmaceutical Sciences , Wuhan University , Wuhan , China
| | - Xiaolin Bi
- a Department of Biological Sciences, College of Basic Medical Sciences , Dalian Medical University , Dalian , China.,b Institute of Cancer Stem Cell, Cancer Center , Dalian Medical University , Dalian , China
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Burroughs AM, Aravind L. A highly conserved family of domains related to the DNA-glycosylase fold helps predict multiple novel pathways for RNA modifications. RNA Biol 2014; 11:360-72. [PMID: 24646681 PMCID: PMC4075521 DOI: 10.4161/rna.28302] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2022] Open
Abstract
A protein family including mammalian NEMF, Drosophila caliban, yeast Tae2, and bacterial FpbA-like proteins was first defined over a decade ago and found to be universally distributed across the three domains/superkingdoms of life. Since its initial characterization, this family of proteins has been tantalizingly linked to a wide range of biochemical functions. Tapping the enormous wealth of genome information that has accumulated since the initial characterization of these proteins, we perform a detailed computational analysis of the family, identifying multiple conserved domains. Domains identified include an enzymatic domain related to the formamidopyrimidine (Fpg), MutM, and Nei/EndoVIII family of DNA glycosylases, a novel, predicted RNA-binding domain, and a domain potentially mediating protein–protein interactions. Through this characterization, we predict that the DNA glycosylase-like domain catalytically operates on double-stranded RNA, as part of a hitherto unknown base modification mechanism that probably targets rRNAs. At least in archaea, and possibly eukaryotes, this pathway might additionally include the AMMECR1 family of proteins. The predicted RNA-binding domain associated with this family is also observed in distinct architectural contexts in other proteins across phylogenetically diverse prokaryotes. Here it is predicted to play a key role in a new pathway for tRNA 4-thiouridylation along with TusA-like sulfur transfer proteins.
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Affiliation(s)
- A Maxwell Burroughs
- 1National Center for Biotechnology Information; National Library of Medicine; National Institutes of Health; Bethesda, MD USA
| | - L Aravind
- 1National Center for Biotechnology Information; National Library of Medicine; National Institutes of Health; Bethesda, MD USA
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