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Xiong W, Roach TG, Ball N, Corluka M, Beyer J, Brown AM, Capelluto DGS. An internal linker and pH biosensing by phosphatidylinositol 5-phosphate regulate the function of the ESCRT-0 component TOM1. Structure 2024; 32:1677-1690.e5. [PMID: 39208792 DOI: 10.1016/j.str.2024.08.003] [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: 05/15/2024] [Revised: 07/11/2024] [Accepted: 08/02/2024] [Indexed: 09/04/2024]
Abstract
Target of Myb1 (TOM1) facilitates the transport of endosomal ubiquitinated proteins destined for lysosomal degradation; however, the mechanisms regulating TOM1 during this process remain unknown. Here, we identified an adjacent DXXLL motif-containing region to the TOM1 VHS domain, which enhances its affinity for ubiquitin and can be modulated by phosphorylation. TOM1 is an endosomal phosphatidylinositol 5-phosphate (PtdIns5P) effector under Shigella flexneri infection. We pinpointed a consensus PtdIns5P-binding motif in the VHS domain. We show that PtdIns5P binding by TOM1 is pH-dependent, similarly observed in its binding partner TOLLIP. Under acidic conditions, TOM1 retained its complex formation with TOLLIP, but was unable to bind ubiquitin. S. flexneri infection inhibits pH-dependent endosomal maturation, leading to reduced protein degradation. We propose a model wherein pumping of H+ to the cytosolic side of endosomes contributes to the accumulation of TOM1, and possibly TOLLIP, at these sites, thereby promoting PtdIns5P- and pH-dependent signaling, facilitating bacterial survival.
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Affiliation(s)
- Wen Xiong
- Protein Signaling Domains Laboratory, Department of Biological Sciences, Fralin Life Sciences Institute, and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg, VA 24061, USA
| | - Tiffany G Roach
- Protein Signaling Domains Laboratory, Department of Biological Sciences, Fralin Life Sciences Institute, and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg, VA 24061, USA
| | - Nicolas Ball
- Research and Informatics, University Libraries, Biochemistry Department, and Center for Drug Discovery, Virginia Tech, Blacksburg, VA 24061, USA
| | - Marija Corluka
- Protein Signaling Domains Laboratory, Department of Biological Sciences, Fralin Life Sciences Institute, and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg, VA 24061, USA
| | - Josephine Beyer
- Protein Signaling Domains Laboratory, Department of Biological Sciences, Fralin Life Sciences Institute, and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg, VA 24061, USA
| | - Anne M Brown
- Research and Informatics, University Libraries, Biochemistry Department, and Center for Drug Discovery, Virginia Tech, Blacksburg, VA 24061, USA
| | - Daniel G S Capelluto
- Protein Signaling Domains Laboratory, Department of Biological Sciences, Fralin Life Sciences Institute, and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg, VA 24061, USA.
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2
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Baig MS, Barmpoutsi S, Bharti S, Weigert A, Hirani N, Atre R, Khabiya R, Sharma R, Sarup S, Savai R. Adaptor molecules mediate negative regulation of macrophage inflammatory pathways: a closer look. Front Immunol 2024; 15:1355012. [PMID: 38482001 PMCID: PMC10933033 DOI: 10.3389/fimmu.2024.1355012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Accepted: 01/22/2024] [Indexed: 04/13/2024] Open
Abstract
Macrophages play a central role in initiating, maintaining, and terminating inflammation. For that, macrophages respond to various external stimuli in changing environments through signaling pathways that are tightly regulated and interconnected. This process involves, among others, autoregulatory loops that activate and deactivate macrophages through various cytokines, stimulants, and other chemical mediators. Adaptor proteins play an indispensable role in facilitating various inflammatory signals. These proteins are dynamic and flexible modulators of immune cell signaling and act as molecular bridges between cell surface receptors and intracellular effector molecules. They are involved in regulating physiological inflammation and also contribute significantly to the development of chronic inflammatory processes. This is at least partly due to their involvement in the activation and deactivation of macrophages, leading to changes in the macrophages' activation/phenotype. This review provides a comprehensive overview of the 20 adaptor molecules and proteins that act as negative regulators of inflammation in macrophages and effectively suppress inflammatory signaling pathways. We emphasize the functional role of adaptors in signal transduction in macrophages and their influence on the phenotypic transition of macrophages from pro-inflammatory M1-like states to anti-inflammatory M2-like phenotypes. This endeavor mainly aims at highlighting and orchestrating the intricate dynamics of adaptor molecules by elucidating the associated key roles along with respective domains and opening avenues for therapeutic and investigative purposes in clinical practice.
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Affiliation(s)
- Mirza S. Baig
- Department of Biosciences and Biomedical Engineering (BSBE), Indian Institute of Technology Indore (IITI), Indore, India
| | - Spyridoula Barmpoutsi
- Lung Microenvironmental Niche in Cancerogenesis, Institute for Lung Health (ILH), Justus Liebig University, Giessen, Germany
- Max Planck Institute for Heart and Lung Research, Member of the German Center for Lung Research (DZL), Member of the Cardio-Pulmonary Institute (CPI), Bad Nauheim, Germany
| | - Shreya Bharti
- Department of Biosciences and Biomedical Engineering (BSBE), Indian Institute of Technology Indore (IITI), Indore, India
| | - Andreas Weigert
- Institute of Biochemistry I, Faculty of Medicine, Goethe University Frankfurt, Frankfurt, Germany
- Frankfurt Cancer Institute (FCI), Goethe University Frankfurt, Frankfurt, Germany
| | - Nik Hirani
- MRC Centre for Inflammation Research, Queen’s Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - Rajat Atre
- Department of Biosciences and Biomedical Engineering (BSBE), Indian Institute of Technology Indore (IITI), Indore, India
| | - Rakhi Khabiya
- Department of Biosciences and Biomedical Engineering (BSBE), Indian Institute of Technology Indore (IITI), Indore, India
| | - Rahul Sharma
- Department of Biosciences and Biomedical Engineering (BSBE), Indian Institute of Technology Indore (IITI), Indore, India
| | - Shivmuni Sarup
- Department of Biosciences and Biomedical Engineering (BSBE), Indian Institute of Technology Indore (IITI), Indore, India
| | - Rajkumar Savai
- Lung Microenvironmental Niche in Cancerogenesis, Institute for Lung Health (ILH), Justus Liebig University, Giessen, Germany
- Max Planck Institute for Heart and Lung Research, Member of the German Center for Lung Research (DZL), Member of the Cardio-Pulmonary Institute (CPI), Bad Nauheim, Germany
- Frankfurt Cancer Institute (FCI), Goethe University Frankfurt, Frankfurt, Germany
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3
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Hayashi Y, Takatori S, Warsame WY, Tomita T, Fujisawa T, Ichijo H. TOLLIP acts as a cargo adaptor to promote lysosomal degradation of aberrant ER membrane proteins. EMBO J 2023; 42:e114272. [PMID: 37929762 PMCID: PMC10690474 DOI: 10.15252/embj.2023114272] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 10/10/2023] [Accepted: 10/11/2023] [Indexed: 11/07/2023] Open
Abstract
Endoplasmic reticulum (ER) proteostasis is maintained by various catabolic pathways. Lysosomes clear entire ER portions by ER-phagy, while proteasomes selectively clear misfolded or surplus aberrant proteins by ER-associated degradation (ERAD). Recently, lysosomes have also been implicated in the selective clearance of aberrant ER proteins, but the molecular basis remains unclear. Here, we show that the phosphatidylinositol-3-phosphate (PI3P)-binding protein TOLLIP promotes selective lysosomal degradation of aberrant membrane proteins, including an artificial substrate and motoneuron disease-causing mutants of VAPB and Seipin. These cargos are recognized by TOLLIP through its misfolding-sensing intrinsically disordered region (IDR) and ubiquitin-binding CUE domain. In contrast to ER-phagy receptors, which clear both native and aberrant proteins by ER-phagy, TOLLIP selectively clears aberrant cargos by coupling them with the PI3P-dependent lysosomal trafficking without promoting bulk ER turnover. Moreover, TOLLIP depletion augments ER stress after ERAD inhibition, indicating that TOLLIP and ERAD cooperatively safeguard ER proteostasis. Our study identifies TOLLIP as a unique type of cargo-specific adaptor dedicated to the clearance of aberrant ER cargos and provides insights into molecular mechanisms underlying lysosome-mediated quality control of membrane proteins.
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Affiliation(s)
- Yuki Hayashi
- Laboratory of Cell Signaling, Graduate School of Pharmaceutical SciencesThe University of TokyoTokyoJapan
| | - Sho Takatori
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical SciencesThe University of TokyoTokyoJapan
| | | | - Taisuke Tomita
- Laboratory of Neuropathology and Neuroscience, Graduate School of Pharmaceutical SciencesThe University of TokyoTokyoJapan
| | - Takao Fujisawa
- Laboratory of Cell Signaling, Graduate School of Pharmaceutical SciencesThe University of TokyoTokyoJapan
| | - Hidenori Ichijo
- Laboratory of Cell Signaling, Graduate School of Pharmaceutical SciencesThe University of TokyoTokyoJapan
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4
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Chen Z, Zhang A, Xu X, Ding L, Zhang X, Qian C, Zhu B. Toll-interacting protein participates in immunity and development of the lepidopteran insect Antheraea pernyi. BULLETIN OF ENTOMOLOGICAL RESEARCH 2023; 113:497-507. [PMID: 37278204 DOI: 10.1017/s0007485323000184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Toll-interacting protein (Tollip) participates in multiple biological processes. However, the biological functions of Tollip proteins in insects remain to be further explored. Here, the genomic sequence of tollip gene from Antheraea pernyi (named Ap-Tollip) was identified with a length of 15,060 bp, including eight exons and seven introns. The predicted Ap-Tollip protein contained conserved C2 and CUE domains and was highly homologous to those tollips from invertebrates. Ap-Tollip was highly expressed in fat body compared with other determined tissues. As far as the developmental stages were concerned, the highest expression level was found at the 14th day in eggs or the 3rd day of the 1st instar. Ap-Tollip was also obviously regulated by lipopolysaccharide, polycytidylic acid or 20E in different tissues. In addition, the interaction between Ap-Tollip and ubiquitin was confirmed by western blotting and pull-down assay. RNAi of Ap-Tollip significantly affected the expression levels of apoptosis and autophagy-related genes. These results indicated that Ap-Tollip was involved in immunity and development of A. pernyi.
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Affiliation(s)
- Zhe Chen
- College of Life Sciences, Anhui Agricultural University, Hefei 230036, China
| | - Awei Zhang
- College of Life Sciences, Anhui Agricultural University, Hefei 230036, China
| | - Xuan Xu
- College of Life Sciences, Anhui Agricultural University, Hefei 230036, China
| | - Lu Ding
- College of Life Sciences, Anhui Agricultural University, Hefei 230036, China
| | - Xiaojiao Zhang
- College of Life Sciences, Anhui Agricultural University, Hefei 230036, China
| | - Cen Qian
- College of Life Sciences, Anhui Agricultural University, Hefei 230036, China
| | - Baojian Zhu
- College of Life Sciences, Anhui Agricultural University, Hefei 230036, China
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5
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Li YJ, Yao CL. Tollip suppresses MyD88-mediated NF-κB activation by enhancing MyD88 ubiquitination levels in large yellow croaker (Larimichthys crocea). FISH & SHELLFISH IMMUNOLOGY 2022; 128:455-465. [PMID: 35988714 DOI: 10.1016/j.fsi.2022.08.038] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 08/01/2022] [Accepted: 08/15/2022] [Indexed: 06/15/2023]
Abstract
Toll-interacting protein (Tollip) plays an important role in the innate immune response by negative regulation of the TLR-IL-1R signaling pathway. MyD88 serves as a universal adaptor in TLR-mediated NF-κB activation. However, the regulation mechanisms of Tollip in piscine MyD88-mediated NF-κB activation is largely unknown. In the present study, the cDNA sequence of LcTollip was identified from the large yellow croaker (Larimichthys crocea). The putative LcTollip protein encoded 275 amino acid residues, containing a N-terminal TBD domain, a central C2 domain, and a C-terminal CUE domain. Quantitative PCR showed that the most predominant constitutive expression of LcTollip was detected in spleen. In addition, LcTollip transcripts enhanced significantly after LPS and poly I:C challenge (P < 0.05). Cellular localization revealed that LcTollip existed in the cytoplasm and nucleus. Furthermore, the overexpression plasmids of wild type LcTollip as well as its six domain truncated mutants of LcTollip were constructed by overlap PCR. Dual luciferase analysis showed that NF-κB activation could not be induced by overexpression of LcTollip or its domain truncated mutants alone. However, the LcMyD88-induced-NF-κB activation was significantly suppressed by overexpression with LcTollip, and the truncated mutants LcTollip-ΔTBD, LcTollip-ΔC2, LcTollip-ΔCUE and LcTollip-ΔTBDΔCUE while not by LcTollip-ΔLR and LcTollip-ΔTBDΔC2. Moreover, co-immunoprecipitation (Co-IP) assay revealed that the interaction between LcTollip and LcMyD88 was through CUE domain. More interesting, IP and immunoblotting examination of HEK293T cells co-transfected with LcMyD88, LcTollip and HA-ubiquitin showed that LcMyD88 induced a dose-dependent de-ubiquitination of LcTollip while LcTollip enhanced a dose-dependent ubiquitination of LcMyD88. However, protein degradation investigation displayed that the proteolysis and ubiquitination of LcMyD88 were not connected. Our findings suggested that the LcTollip might involve in negative regulation TLR pathway by suppressing LcMyD88-mediated immune activation and improving the ubiquitination level of LcMyD88.
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Affiliation(s)
- Yong-Jian Li
- Fisheries College, Jimei University, Xiamen, 361021, China
| | - Cui-Luan Yao
- Fisheries College, Jimei University, Xiamen, 361021, China.
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6
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Roach TG, Lång HKM, Xiong W, Ryhänen SJ, Capelluto DGS. Protein Trafficking or Cell Signaling: A Dilemma for the Adaptor Protein TOM1. Front Cell Dev Biol 2021; 9:643769. [PMID: 33718385 PMCID: PMC7952518 DOI: 10.3389/fcell.2021.643769] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2020] [Accepted: 02/09/2021] [Indexed: 12/29/2022] Open
Abstract
Lysosomal degradation of ubiquitinated transmembrane protein receptors (cargo) relies on the function of Endosomal Sorting Complex Required for Transport (ESCRT) protein complexes. The ESCRT machinery is comprised of five unique oligomeric complexes with distinct functions. Target of Myb1 (TOM1) is an ESCRT protein involved in the initial steps of endosomal cargo sorting. To exert its function, TOM1 associates with ubiquitin moieties on the cargo via its VHS and GAT domains. Several ESCRT proteins, including TOLLIP, Endofin, and Hrs, have been reported to form a complex with TOM1 at early endosomal membrane surfaces, which may potentiate the role of TOM1 in cargo sorting. More recently, it was found that TOM1 is involved in other physiological processes, including autophagy, immune responses, and neuroinflammation, which crosstalk with its endosomal cargo sorting function. Alteration of TOM1 function has emerged as a phosphoinositide-dependent survival mechanism for bacterial infections and cancer progression. Based on current knowledge of TOM1-dependent cellular processes, this review illustrates how TOM1 functions in coordination with an array of protein partners under physiological and pathological scenarios.
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Affiliation(s)
- Tiffany G. Roach
- Protein Signaling Domains Laboratory, Department of Biological Sciences, Fralin Life Sciences Institute, and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg, VA, United States
| | - Heljä K. M. Lång
- Division of Hematology, Oncology, and Stem Cell Transplantation, Children’s Hospital, and Pediatric Research Center, The New Children’s Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
- Department of Anatomy and Stem Cells and Metabolism Research Program, Faculty of Medicine, University of Helsinki, Helsinki, Finland
| | - Wen Xiong
- Protein Signaling Domains Laboratory, Department of Biological Sciences, Fralin Life Sciences Institute, and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg, VA, United States
| | - Samppa J. Ryhänen
- Division of Hematology, Oncology, and Stem Cell Transplantation, Children’s Hospital, and Pediatric Research Center, The New Children’s Hospital, University of Helsinki and Helsinki University Hospital, Helsinki, Finland
| | - Daniel G. S. Capelluto
- Protein Signaling Domains Laboratory, Department of Biological Sciences, Fralin Life Sciences Institute, and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg, VA, United States
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7
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Lin CY, Nozawa T, Minowa-Nozawa A, Toh H, Hikichi M, Iibushi J, Nakagawa I. Autophagy Receptor Tollip Facilitates Bacterial Autophagy by Recruiting Galectin-7 in Response to Group A Streptococcus Infection. Front Cell Infect Microbiol 2021; 10:583137. [PMID: 33425778 PMCID: PMC7786282 DOI: 10.3389/fcimb.2020.583137] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 11/19/2020] [Indexed: 01/09/2023] Open
Abstract
Bacterial autophagy—a type of macroautophagy that is also termed xenophagy—selectively targets intracellular bacteria such as group A Streptococcus (GAS), a ubiquitous pathogen that causes numerous serious diseases, including pharyngitis, skin infections, and invasive life-threatening infections. Although bacterial autophagy is known to eliminate invading bacteria via the action of autophagy receptors, the underlying mechanism remains unclear. Herein, we elucidated that Tollip functions as a bacterial-autophagy receptor in addition to participating involved in the intracellular immunity mechanism that defends against bacterial infection. Tollip was recruited to GAS-containing endosomal vacuoles prior to the escape of GAS into the cytosol; additionally, Tollip knockout disrupted the recruitment of other autophagy receptors, such as NBR1, TAX1BP1, and NDP52, to GAS-containing autophagosomes and led to prolonged intracellular survival of GAS. Furthermore, Tollip was found to be required for the recruitment of galectin-1 and -7 to GAS-containing autophagosomes, and immunoprecipitation results indicated that Tollip interacts with galectin-7. Lastly, our data also revealed that galectin-1 and -7 are involved in the restriction of GAS replication in cells. These results demonstrated that Tollip modulates bacterial autophagy by recruiting other autophagy receptors and galectins.
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Affiliation(s)
- Ching-Yu Lin
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Takashi Nozawa
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Atsuko Minowa-Nozawa
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Hirotaka Toh
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Miyako Hikichi
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Junpei Iibushi
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Ichiro Nakagawa
- Department of Microbiology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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8
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Li X, Goobie GC, Zhang Y. Toll-interacting protein impacts on inflammation, autophagy, and vacuole trafficking in human disease. J Mol Med (Berl) 2020; 99:21-31. [PMID: 33128579 DOI: 10.1007/s00109-020-01999-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Revised: 09/30/2020] [Accepted: 10/23/2020] [Indexed: 02/08/2023]
Abstract
Toll-interacting protein (TOLLIP) is a ubiquitous intracellular adaptor protein involved in multiple intracellular signaling pathways. It plays a key role in mediating inflammatory intracellular responses, promoting autophagy, and enabling vacuole transport within the cell. TOLLIP is being increasingly recognized for its role in disease pathophysiology through involvement in these three primary pathways. Recent research also indicates that TOLLIP is involved in nuclear-cytoplasmic transfer, although this area requires further exploration. TOLLIP is involved in the pathophysiologic pathways associated with neurodegenerative diseases, pulmonary diseases, cardiovascular disease, inflammatory bowel disease, and malignancy. We postulate that TOLLIP plays an integral role in the disease pathophysiology of other conditions involved in vacuole trafficking and autophagy. We suggest that future research in this field should investigate the role of TOLLIP in the pathogenesis of these multiple conditions. This research has the potential to inform disease mechanisms and identify novel opportunities for therapeutic advances in multiple disease processes.
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Affiliation(s)
- Xiaoyun Li
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, 15213, USA
| | - Gillian C Goobie
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, 15213, USA.,Clinician Investigator Program, Department of Medicine, University of British Columbia, BC, V5Z-3X7, Vancouver, Canada
| | - Yingze Zhang
- Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Pittsburgh, Pittsburgh, PA, 15213, USA. .,Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA, 15213, USA.
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9
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Barnett KC, Kagan JC. Lipids that directly regulate innate immune signal transduction. Innate Immun 2020; 26:4-14. [PMID: 31180799 PMCID: PMC6901815 DOI: 10.1177/1753425919852695] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2019] [Revised: 04/19/2019] [Accepted: 04/22/2019] [Indexed: 12/28/2022] Open
Abstract
Pattern Recognition Receptors (PRRs) detect evidence of infection and tissue damage. The activation of these receptors and their downstream signal transduction pathways initiate a protective immune response. These signaling pathways are influenced by their spatial context, and precise subcellular positioning of proteins and protein complexes in these pathways is essential for effective immune responses in vivo . This organization is not limited to transmembrane proteins that reside in specific organelles, but also to proteins that engage membrane lipid head groups for proper positioning. In this review, we focus on the role of cell membranes and protein–lipid interactions in innate immune signal transduction and how their mechanisms of localization regulate the immune response. We will discuss how lipids spatially regulate the sensing of damage or infection, mediate effector activity, and serve as messengers of cell death and tissue damage.
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Affiliation(s)
- Katherine C Barnett
- Harvard Medical School and Division of
Gastroenterology, Boston Children’s Hospital, USA
| | - Jonathan C Kagan
- Harvard Medical School and Division of
Gastroenterology, Boston Children’s Hospital, USA
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10
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Mariano DO, Prezotto-Neto JP, Spencer PJ, Sciani JM, Pimenta DC. Proteomic analysis of soluble proteins retrieved from Duttaphrynus melanostictus skin secretion by IEx-batch sample preparation. J Proteomics 2019; 209:103525. [DOI: 10.1016/j.jprot.2019.103525] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 08/15/2019] [Accepted: 09/12/2019] [Indexed: 12/18/2022]
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11
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Patnaik BB, Chung JM, Hwang HJ, Sang MK, Park JE, Min HR, Cho HC, Dewangan N, Baliarsingh S, Kang SW, Park SY, Jo YH, Park HS, Kim WJ, Han YS, Lee JS, Lee YS. Transcriptome analysis of air-breathing land slug, Incilaria fruhstorferi reveals functional insights into growth, immunity, and reproduction. BMC Genomics 2019; 20:154. [PMID: 30808280 PMCID: PMC6390351 DOI: 10.1186/s12864-019-5526-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2018] [Accepted: 02/11/2019] [Indexed: 01/27/2023] Open
Abstract
Background Incilaria (= Meghimatium) fruhstorferi is an air-breathing land slug found in restricted habitats of Japan, Taiwan and selected provinces of South Korea (Jeju, Chuncheon, Busan, and Deokjeokdo). The species is on a decline due to depletion of forest cover, predation by natural enemies, and collection. To facilitate the conservation of the species, it is important to decide on a number of traits related to growth, immunity and reproduction addressing fitness advantage of the species. Results The visceral mass transcriptome of I. fruhstorferi was enabled using the Illumina HiSeq 4000 sequencing platform. According to BUSCO (Benchmarking Universal Single-Copy Orthologs) method, the transcriptome was considered complete with 91.8% of ortholog genes present (Single: 70.7%; Duplicated: 21.1%). A total of 96.79% of the raw read sequences were processed as clean reads. TransDecoder identified 197,271 contigs that contained candidate-coding regions. Of a total of 50,230 unigenes, 34,470 (68.62% of the total unigenes) annotated to homologous proteins in the Protostome database (PANM-DB). The GO term and KEGG pathway analysis indicated genes involved in metabolism, phosphatidylinositol signalling system, aminobenzoate degradation, and T-cell receptor signalling pathway. Many genes associated with molluscan innate immunity were categorized under pathogen recognition receptor, TLR signalling pathway, MyD88 dependent pathway, endogenous ligands, immune effectors, antimicrobial peptides, apoptosis, and adaptation-related. The reproduction-associated unigenes showed homology to protein fem-1, spermatogenesis-associated protein, sperm associated antigen, and testis expressed sequences, among others. In addition, we identified key growth-related genes categorized under somatotrophic axis, muscle growth, chitinases and collagens. A total of 4822 Simple Sequence Repeats (SSRs) were also identified from the unigene sequences of I. fruhstorferi. Conclusions This is the first available genomic information for non-model land slug, I. fruhstorferi focusing on genes related to growth, immunity, and reproduction, with additional focus on microsatellites and repeating elements. The transcriptome provides access to greater number of traits of unknown relevance in the species that could be exploited for in-depth analyses of evolutionary plasticity and making informed choices during conservation planning. This would be appropriate for understanding the dynamics of the species on a priority basis considering the ecological, health, and social benefits. Electronic supplementary material The online version of this article (10.1186/s12864-019-5526-3) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Bharat Bhusan Patnaik
- School of Biotech Sciences, Trident Academy of Creative Technology (TACT), F2-B, Chandaka Industrial Estate, Chandrasekharpur, Bhubaneswar, Odisha, 751024, India
| | - Jong Min Chung
- Department of Life Science and Biotechnology, College of Natural Sciences, Soonchunhyang University, 22 Soonchunhyangro, Shinchang-myeon, Asan, Chungchungnam-do, 31538, South Korea
| | - Hee Ju Hwang
- Department of Life Science and Biotechnology, College of Natural Sciences, Soonchunhyang University, 22 Soonchunhyangro, Shinchang-myeon, Asan, Chungchungnam-do, 31538, South Korea
| | - Min Kyu Sang
- Department of Life Science and Biotechnology, College of Natural Sciences, Soonchunhyang University, 22 Soonchunhyangro, Shinchang-myeon, Asan, Chungchungnam-do, 31538, South Korea
| | - Jie Eun Park
- Department of Life Science and Biotechnology, College of Natural Sciences, Soonchunhyang University, 22 Soonchunhyangro, Shinchang-myeon, Asan, Chungchungnam-do, 31538, South Korea
| | - Hye Rin Min
- Department of Life Science and Biotechnology, College of Natural Sciences, Soonchunhyang University, 22 Soonchunhyangro, Shinchang-myeon, Asan, Chungchungnam-do, 31538, South Korea
| | - Hang Chul Cho
- Department of Life Science and Biotechnology, College of Natural Sciences, Soonchunhyang University, 22 Soonchunhyangro, Shinchang-myeon, Asan, Chungchungnam-do, 31538, South Korea
| | - Neha Dewangan
- School of Biotech Sciences, Trident Academy of Creative Technology (TACT), F2-B, Chandaka Industrial Estate, Chandrasekharpur, Bhubaneswar, Odisha, 751024, India
| | - Snigdha Baliarsingh
- School of Biotech Sciences, Trident Academy of Creative Technology (TACT), F2-B, Chandaka Industrial Estate, Chandrasekharpur, Bhubaneswar, Odisha, 751024, India
| | - Se Won Kang
- Biological Resource Center, Korea Research Institute of Bioscience and Biotechnology (KRIBB), 181, Ipsin-gil, Jungeup-si, Jeollabuk-do, 56212, South Korea
| | - So Young Park
- Nakdonggang National Institute of Biological Resources, Biodiversity Conservation and Change Research Division, 137, Donam-2-gil, Sangju-si, Gyeongsangbuk-do, 37242, South Korea
| | - Yong Hun Jo
- College of Agriculture and Life Science, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, South Korea
| | - Hong Seog Park
- Research Institute, GnC BIO Co., LTD, 621-6 Banseok-dong, Yuseong-gu, Daejeon, 34069, Republic of Korea
| | - Wan Jong Kim
- Department of Life Science and Biotechnology, College of Natural Sciences, Soonchunhyang University, 22 Soonchunhyangro, Shinchang-myeon, Asan, Chungchungnam-do, 31538, South Korea
| | - Yeon Soo Han
- College of Agriculture and Life Science, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, South Korea
| | - Jun Sang Lee
- Institute of Basic Science, Soonchunhyang University, 22 Soonchunhyangro, Shinchang-myeon, Asan, Chungchungnam-do, 31538, South Korea
| | - Yong Seok Lee
- Department of Life Science and Biotechnology, College of Natural Sciences, Soonchunhyang University, 22 Soonchunhyangro, Shinchang-myeon, Asan, Chungchungnam-do, 31538, South Korea.
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12
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The Roles of Ubiquitin-Binding Protein Shuttles in the Degradative Fate of Ubiquitinated Proteins in the Ubiquitin-Proteasome System and Autophagy. Cells 2019; 8:cells8010040. [PMID: 30634694 PMCID: PMC6357184 DOI: 10.3390/cells8010040] [Citation(s) in RCA: 85] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2018] [Revised: 12/24/2018] [Accepted: 01/03/2019] [Indexed: 12/15/2022] Open
Abstract
The ubiquitin-proteasome system (UPS) and autophagy are the two major intracellular protein quality control (PQC) pathways that are responsible for cellular proteostasis (homeostasis of the proteome) by ensuring the timely degradation of misfolded, damaged, and unwanted proteins. Ubiquitination serves as the degradation signal in both these systems, but substrates are precisely targeted to one or the other pathway. Determining how and when cells target specific proteins to these two alternative PQC pathways and control the crosstalk between them are topics of considerable interest. The ubiquitin (Ub) recognition code based on the type of Ub-linked chains on substrate proteins was believed to play a pivotal role in this process, but an increasing body of evidence indicates that the PQC pathway choice is also made based on other criteria. These include the oligomeric state of the Ub-binding protein shuttles, their conformation, protein modifications, and the presence of motifs that interact with ATG8/LC3/GABARAP (autophagy-related protein 8/microtubule-associated protein 1A/1B-light chain 3/GABA type A receptor-associated protein) protein family members. In this review, we summarize the current knowledge regarding the Ub recognition code that is bound by Ub-binding proteasomal and autophagic receptors. We also discuss how cells can modify substrate fate by modulating the structure, conformation, and physical properties of these receptors to affect their shuttling between both degradation pathways.
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13
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Kowalski E, Geng S, Rathes A, Lu R, Li L. Toll-interacting protein differentially modulates HIF1α and STAT5-mediated genes in fibroblasts. J Biol Chem 2018; 293:12239-12247. [PMID: 29921584 DOI: 10.1074/jbc.ra118.003382] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Revised: 06/11/2018] [Indexed: 11/06/2022] Open
Abstract
Toll-interacting protein (Tollip) deficiency has been implicated in complex inflammatory and infectious diseases whose mechanisms are poorly understood. Comparing the gene expression profiles of WT and Tollip-deficient murine embryonic fibroblasts, we observed here that Tollip deficiency selectively reduces the expression of the inflammatory cytokines interleukin 6 (IL-6), IL-12, and tumor necrosis factor α (TNFα) but potentiates the expression of fatty acid-binding protein 4 (FABP4) in these cells. We also observed that expression of hypoxia-inducible factor 1-α (HIF1α) is reduced, whereas that of signal transducer and activator of transcription 5 (STAT5) is elevated, in Tollip-deficient cells, correlating with the decreased expression of inflammatory cytokines and increased expression of FABP4 in these cells. We further found that the coupling of ubiquitin to ER degradation (CUE) domain of Tollip is required for stimulating HIF1α activity, because Tollip CUE-domain mutant cells exhibited reduced levels of HIF1α and selected cytokines. Tollip is known to mediate autophagy and lysosome fusion, and herein we observed that Tollip's autophagy function is required for modulating STAT5 and FABP4 expression. Bafilomycin A, an inhibitor of lysosome fusion, enhanced STAT5 and FABP4 expression in WT fibroblasts, whereas torin 2, an activator of autophagy, reduced STAT5 and FABP4 expression in Tollip-deficient fibroblasts. Taken together, our study reveals that Tollip differentially modulates HIF1α and STAT5 expression in fibroblasts, potentially explaining the complex and context-dependent contribution of Tollip to disease development.
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Affiliation(s)
- Elizabeth Kowalski
- Department of Biological Sciences and Biochemistry, Virginia Tech, Blacksburg, Virginia 24061
| | - Shuo Geng
- Department of Biological Sciences and Biochemistry, Virginia Tech, Blacksburg, Virginia 24061
| | - Allison Rathes
- Department of Biological Sciences and Biochemistry, Virginia Tech, Blacksburg, Virginia 24061
| | - Ran Lu
- Department of Biological Sciences and Biochemistry, Virginia Tech, Blacksburg, Virginia 24061
| | - Liwu Li
- Department of Biological Sciences and Biochemistry, Virginia Tech, Blacksburg, Virginia 24061.
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14
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Kowalski EJA, Li L. Toll-Interacting Protein in Resolving and Non-Resolving Inflammation. Front Immunol 2017; 8:511. [PMID: 28529512 PMCID: PMC5418219 DOI: 10.3389/fimmu.2017.00511] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 04/18/2017] [Indexed: 12/17/2022] Open
Abstract
Innate leukocytes manifest dynamic and distinct inflammatory responses upon challenges with rising dosages of pathogen-associated molecular pattern molecules such as lipopolysaccharide (LPS). To differentiate signal strengths, innate leukocytes may utilize distinct intracellular signaling circuitries modulated by adaptor molecules. Toll-interacting protein (Tollip) is one of the critical adaptor molecules potentially playing key roles in modulating the dynamic adaptation of innate leukocytes to varying dosages of external stimulants. While Tollip may serve as a negative regulator of nuclear factor κ of activated B cells signaling pathway in cells challenged with higher dosages of LPS, it acts as a positive regulator for low-grade chronic inflammation in leukocytes programmed by subclinical low-dosages of LPS. This review aims to discuss recent progress in our understanding of complex innate leukocyte dynamics and its relevance in the pathogenesis of resolving versus non-resolving chronic inflammatory diseases.
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Affiliation(s)
- Elizabeth J A Kowalski
- Department of Biological Sciences, Virginia Polytechnic State University, Blacksburg, VA, USA
| | - Liwu Li
- Department of Biological Sciences, Virginia Polytechnic State University, Blacksburg, VA, USA
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15
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Ellena JF, Xiong W, Zhao X, Shanaiah N, Capelluto DGS. Backbone 1H, 15N, and 13C resonance assignments of the Tom1 VHS domain. BIOMOLECULAR NMR ASSIGNMENTS 2017; 11:1-4. [PMID: 27704363 DOI: 10.1007/s12104-016-9709-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2016] [Accepted: 09/29/2016] [Indexed: 06/06/2023]
Abstract
Efficient trafficking of ubiquitinated receptors (cargo) to endosomes requires the recruitment of adaptor proteins that exhibit ubiquitin-binding domains for recognition and transport. Tom1 is an adaptor protein that not only associates with ubiquitinated cargo but also represents a phosphoinositide effector during specific bacterial infections. This phosphoinositide-binding property is associated with its N-terminal Vps27, Hrs, STAM (VHS) domain. Despite its biological relevance, there are no resonance assignments of Tom1 VHS available that can fully characterize its molecular interactions. Here, we report the nearly complete 1H, 15N, and 13C backbone resonance assignments of the VHS domain of human Tom1.
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Affiliation(s)
- Jeffrey F Ellena
- Biomolecular Magnetic Resonance Facility, University of Virginia, Charlottesville, VA, 22904, USA
| | - Wen Xiong
- Protein Signaling Domains Laboratory, Department of Biological Sciences, Biocomplexity Institute and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg, VA, 24061, USA
| | - Xiaolin Zhao
- Protein Signaling Domains Laboratory, Department of Biological Sciences, Biocomplexity Institute and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg, VA, 24061, USA
| | | | - Daniel G S Capelluto
- Protein Signaling Domains Laboratory, Department of Biological Sciences, Biocomplexity Institute and Center for Soft Matter and Biological Physics, Virginia Tech, Blacksburg, VA, 24061, USA.
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16
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Jongsma MLM, Berlin I, Wijdeven RHM, Janssen L, Janssen GMC, Garstka MA, Janssen H, Mensink M, van Veelen PA, Spaapen RM, Neefjes J. An ER-Associated Pathway Defines Endosomal Architecture for Controlled Cargo Transport. Cell 2017; 166:152-66. [PMID: 27368102 PMCID: PMC4930482 DOI: 10.1016/j.cell.2016.05.078] [Citation(s) in RCA: 168] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2015] [Revised: 03/25/2016] [Accepted: 05/25/2016] [Indexed: 12/30/2022]
Abstract
Through a network of progressively maturing vesicles, the endosomal system connects the cell's interior with extracellular space. Intriguingly, this network exhibits a bilateral architecture, comprised of a relatively immobile perinuclear vesicle "cloud" and a highly dynamic peripheral contingent. How this spatiotemporal organization is achieved and what function(s) it curates is unclear. Here, we reveal the endoplasmic reticulum (ER)-located ubiquitin ligase Ring finger protein 26 (RNF26) as the global architect of the entire endosomal system, including the trans-Golgi network (TGN). To specify perinuclear vesicle coordinates, catalytically competent RNF26 recruits and ubiquitinates the scaffold p62/sequestosome 1 (p62/SQSTM1), in turn attracting ubiquitin-binding domains (UBDs) of various vesicle adaptors. Consequently, RNF26 restrains fast transport of diverse vesicles through a common molecular mechanism operating at the ER membrane, until the deubiquitinating enzyme USP15 opposes RNF26 activity to allow vesicle release into the cell's periphery. By drawing the endosomal system's architecture, RNF26 orchestrates endosomal maturation and trafficking of cargoes, including signaling receptors, in space and time.
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Affiliation(s)
- Marlieke L M Jongsma
- Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands; Department of Immunopathology, Sanquin Research and Landsteiner Laboratory AMC/UvA, Plesmanlaan 125, 1066 CX Amsterdam, the Netherlands
| | - Ilana Berlin
- Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands.
| | - Ruud H M Wijdeven
- Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands
| | - Lennert Janssen
- Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands
| | - George M C Janssen
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Centre, P.O. Box 9600, 2300 RC Leiden, the Netherlands
| | - Malgorzata A Garstka
- Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands
| | - Hans Janssen
- Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands
| | - Mark Mensink
- Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands
| | - Peter A van Veelen
- Department of Immunohematology and Blood Transfusion, Leiden University Medical Centre, P.O. Box 9600, 2300 RC Leiden, the Netherlands
| | - Robbert M Spaapen
- Department of Immunopathology, Sanquin Research and Landsteiner Laboratory AMC/UvA, Plesmanlaan 125, 1066 CX Amsterdam, the Netherlands
| | - Jacques Neefjes
- Division of Cell Biology, The Netherlands Cancer Institute, Plesmanlaan 121, 1066 CX Amsterdam, the Netherlands; Department of Chemical Immunology, Leiden University Medical Centre, P.O. Box 9600, 2300 RC Leiden, the Netherlands.
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17
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Abstract
In this issue of Structure, Xiao et al. (2015) describe a new mechanism of regulation of lipid binding. Structural and functional studies demonstrate that Tom1 interactions with the cargo sorting protein Tollip induce the partially unfolded Tom1-binding domain of Tollip to fold. This folding modulates lipid binding of Tollip, mediating its dissociation from PI(3)P and committing Tollip to cargo trafficking.
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18
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Abstract
Innate immune responses are key to maintain adequate host-microbial interactions. However, those signals are needed to efficiently trigger rapid and targeted antimicrobial responses in case of pathogen encounter. Several molecules have evolved to regulate intensity and coordinate signaling to avoid detrimental consequences to the host. Regulation can occur at the cell surface, within the cytoplasm, and at the transcriptional level. Innate immune regulation seems to be equally important than stimulation, as disruption of immunoregulatory molecules modulates the risk for several diseases. This is the case for colitis and inflammatory bowel disease but also colorectal cancer and intestinal infections. In this review, we recapitulate the molecular mechanisms underlying regulation of innate immune signals and mention their implications in several disease states including inflammatory bowel disease.
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19
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Tom1 Modulates Binding of Tollip to Phosphatidylinositol 3-Phosphate via a Coupled Folding and Binding Mechanism. Structure 2015; 23:1910-1920. [DOI: 10.1016/j.str.2015.07.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2015] [Revised: 07/24/2015] [Accepted: 07/28/2015] [Indexed: 11/18/2022]
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20
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Endocytic Adaptor Protein Tollip Inhibits Canonical Wnt Signaling. PLoS One 2015; 10:e0130818. [PMID: 26110841 PMCID: PMC4482507 DOI: 10.1371/journal.pone.0130818] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2014] [Accepted: 05/26/2015] [Indexed: 01/12/2023] Open
Abstract
Many adaptor proteins involved in endocytic cargo transport exhibit additional functions in other cellular processes which may be either related to or independent from their trafficking roles. The endosomal adaptor protein Tollip is an example of such a multitasking regulator, as it participates in trafficking and endosomal sorting of receptors, but also in interleukin/Toll/NF-κB signaling, bacterial entry, autophagic clearance of protein aggregates and regulation of sumoylation. Here we describe another role of Tollip in intracellular signaling. By performing a targeted RNAi screen of soluble endocytic proteins for their additional functions in canonical Wnt signaling, we identified Tollip as a potential negative regulator of this pathway in human cells. Depletion of Tollip potentiates the activity of β-catenin/TCF-dependent transcriptional reporter, while its overproduction inhibits the reporter activity and expression of Wnt target genes. These effects are independent of dynamin-mediated endocytosis, but require the ubiquitin-binding CUE domain of Tollip. In Wnt-stimulated cells, Tollip counteracts the activation of β-catenin and its nuclear accumulation, without affecting its total levels. Additionally, under conditions of ligand-independent signaling, Tollip inhibits the pathway after the stage of β-catenin stabilization, as observed in human cancer cell lines, characterized by constitutive β-catenin activity. Finally, the regulation of Wnt signaling by Tollip occurs also during early embryonic development of zebrafish. In summary, our data identify a novel function of Tollip in regulating the canonical Wnt pathway which is evolutionarily conserved between fish and humans. Tollip-mediated inhibition of Wnt signaling may contribute not only to embryonic development, but also to carcinogenesis. Mechanistically, Tollip can potentially coordinate multiple cellular pathways of trafficking and signaling, possibly by exploiting its ability to interact with ubiquitin and the sumoylation machinery.
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21
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Zhang R, Li R, Wang J, Wang S, Zhang M, Hu X, Zhang L, Wang S, Wang R, Bao Z. Identification, characterization and expression profiling of the Tollip gene in Yesso scallop ( Patinopecten yessoensis). Genes Genet Syst 2015; 90:99-108. [DOI: 10.1266/ggs.90.99] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Affiliation(s)
- Ru Zhang
- Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China
| | - Ruojiao Li
- Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China
| | - Jing Wang
- Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China
| | - Shuyue Wang
- Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China
| | - Mengran Zhang
- Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China
| | - Xiaoli Hu
- Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China
| | - Lingling Zhang
- Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China
| | - Shi Wang
- Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China
| | - Ruijia Wang
- Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China
| | - Zhenmin Bao
- Key Laboratory of Marine Genetics and Breeding, College of Marine Life Sciences, Ocean University of China
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22
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Kanwal Z, Wiegertjes GF, Veneman WJ, Meijer AH, Spaink HP. Comparative studies of Toll-like receptor signalling using zebrafish. DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2014; 46:35-52. [PMID: 24560981 DOI: 10.1016/j.dci.2014.02.003] [Citation(s) in RCA: 64] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 02/04/2014] [Accepted: 02/06/2014] [Indexed: 06/03/2023]
Abstract
Zebrafish model systems for infectious disease are increasingly used for the functional analysis of molecular pattern recognition processes. These studies benefit from the high conservation level of all innate immune factors in vertebrates. Zebrafish studies are strategically well positioned for this because of the ease of comparisons with studies in other fish species of which the immune system also has been intensively studied, but that are currently still less amendable to detailed genetic or microscopic studies. In this paper we focus on Toll-like receptor (TLR) signalling factors, which currently are the best characterized in mammalian systems. We review the knowledge on TLR signalling in the context of recent advances in zebrafish studies and discuss possibilities for future approaches that can complement studies in cell cultures and rodent models. A focus in these comparisons is the role of negative control mechanisms in immune responses that appear very important in a whole organism to keep adverse systemic responses in check. We also pay much attention to comparisons with studies in common carp that is highly related to zebrafish and that because of its large body mass can complement immune studies in zebrafish.
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Affiliation(s)
- Zakia Kanwal
- Department of Animal Sciences and Health, Institute of Biology, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Geert F Wiegertjes
- Cell Biology and Immunology Group, Wageningen Institute of Animal Sciences, Wageningen University, PO Box 338, 6700 AH Wageningen, The Netherlands
| | - Wouter J Veneman
- Department of Animal Sciences and Health, Institute of Biology, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Annemarie H Meijer
- Department of Animal Sciences and Health, Institute of Biology, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands
| | - Herman P Spaink
- Department of Animal Sciences and Health, Institute of Biology, Leiden University, Einsteinweg 55, 2333 CC Leiden, The Netherlands.
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23
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Autophagic clearance of polyQ proteins mediated by ubiquitin-Atg8 adaptors of the conserved CUET protein family. Cell 2014; 158:549-63. [PMID: 25042851 DOI: 10.1016/j.cell.2014.05.048] [Citation(s) in RCA: 263] [Impact Index Per Article: 26.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2014] [Revised: 04/29/2014] [Accepted: 05/19/2014] [Indexed: 01/08/2023]
Abstract
Selective ubiquitin-dependent autophagy plays a pivotal role in the elimination of protein aggregates, assemblies, or organelles and counteracts the cytotoxicity of proteins linked to neurodegenerative diseases. Following substrate ubiquitylation, the cargo is delivered to autophagosomes involving adaptors like human p62 that bind ubiquitin and the autophagosomal ubiquitin-like protein Atg8/LC3; however, whether similar pathways exist in lower eukaryotes remained unclear. Here, we identify by a screen in yeast a new class of ubiquitin-Atg8 adaptors termed CUET proteins, comprising the ubiquitin-binding CUE-domain protein Cue5 from yeast and its human homolog Tollip. Cue5 collaborates with Rsp5 ubiquitin ligase, and the corresponding yeast mutants accumulate aggregation-prone proteins and are vulnerable to polyQ protein expression. Similarly, Tollip depletion causes cytotoxicity toward polyQ proteins, whereas Tollip overexpression clears human cells from Huntington's disease-linked polyQ proteins by autophagy. We thus propose that CUET proteins play a critical and ancient role in autophagic clearance of cytotoxic protein aggregates.
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24
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McMahon D, Dinh A, Kurz D, Shah D, Han GS, Carman GM, Brasaemle DL. Comparative gene identification 58/α/β hydrolase domain 5 lacks lysophosphatidic acid acyltransferase activity. J Lipid Res 2014; 55:1750-61. [PMID: 24879803 DOI: 10.1194/jlr.m051151] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Indexed: 01/07/2023] Open
Abstract
Mutations in the gene encoding comparative gene identification 58 (CGI-58)/α/β hydrolase domain 5 (ABHD5) cause Chanarin-Dorfman syndrome, characterized by excessive triacylglycerol storage in cells and tissues. CGI-58 has been identified as a coactivator of adipose TG lipase (ATGL) and a lysophosphatidic acid acyltransferase (LPAAT). We developed a molecular model of CGI-58 structure and then mutated predicted active site residues and performed LPAAT activity assays of recombinant WT and mutated CGI-58. When mutations of predicted catalytic residues failed to reduce LPAAT activity, we determined that LPAAT activity was due to a bacterial contaminant of affinity purification procedures, plsC, the sole LPAAT in Escherichia coli Purification protocols were optimized to reduce plsC contamination, in turn reducing LPAAT activity. When CGI-58 was expressed in SM2-1(DE3) cells that lack plsC, lysates lacked LPAAT activity. Additionally, mouse CGI-58 expressed in bacteria as a glutathione-S-transferase fusion protein and human CGI-58 expressed in yeast lacked LPAAT activity. Previously reported lipid binding activity of CGI-58 was revisited using protein-lipid overlays. Recombinant CGI-58 failed to bind lysophosphatidic acid, but interestingly, bound phosphatidylinositol 3-phosphate [PI(3)P] and phosphatidylinositol 5-phosphate [PI(5)P]. Prebinding CGI-58 with PI(3)P or PI(5)P did not alter its coactivation of ATGL in vitro. In summary, purified recombinant CGI-58 that is functional as an ATGL coactivator lacks LPAAT activity.
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Affiliation(s)
- Derek McMahon
- Rutgers Center for Lipid Research and Department of Nutritional Sciences and Rutgers Center for Lipid Research and Department of Food Science
| | - Anna Dinh
- Rutgers Center for Lipid Research and Department of Nutritional Sciences and Rutgers Center for Lipid Research and Department of Food Science
| | - Daniel Kurz
- Rutgers Center for Lipid Research and Department of Nutritional Sciences and Rutgers Center for Lipid Research and Department of Food Science
| | - Dharika Shah
- Rutgers Center for Lipid Research and Department of Nutritional Sciences and Rutgers Center for Lipid Research and Department of Food Science
| | - Gil-Soo Han
- Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
| | - George M Carman
- Rutgers, The State University of New Jersey, New Brunswick, NJ 08901
| | - Dawn L Brasaemle
- Rutgers Center for Lipid Research and Department of Nutritional Sciences and Rutgers Center for Lipid Research and Department of Food Science
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25
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Stahelin RV, Scott JL, Frick CT. Cellular and molecular interactions of phosphoinositides and peripheral proteins. Chem Phys Lipids 2014; 182:3-18. [PMID: 24556335 DOI: 10.1016/j.chemphyslip.2014.02.002] [Citation(s) in RCA: 86] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2014] [Revised: 02/05/2014] [Accepted: 02/05/2014] [Indexed: 12/23/2022]
Abstract
Anionic lipids act as signals for the recruitment of proteins containing cationic clusters to biological membranes. A family of anionic lipids known as the phosphoinositides (PIPs) are low in abundance, yet play a critical role in recruitment of peripheral proteins to the membrane interface. PIPs are mono-, bis-, or trisphosphorylated derivatives of phosphatidylinositol (PI) yielding seven species with different structure and anionic charge. The differential spatial distribution and temporal appearance of PIPs is key to their role in communicating information to target proteins. Selective recognition of PIPs came into play with the discovery that the substrate of protein kinase C termed pleckstrin possessed the first PIP binding region termed the pleckstrin homology (PH) domain. Since the discovery of the PH domain, more than ten PIP binding domains have been identified including PH, ENTH, FYVE, PX, and C2 domains. Representative examples of each of these domains have been thoroughly characterized to understand how they coordinate PIP headgroups in membranes, translocate to specific membrane docking sites in the cell, and function to regulate the activity of their full-length proteins. In addition, a number of novel mechanisms of PIP-mediated membrane association have emerged, such as coincidence detection-specificity for two distinct lipid headgroups. Other PIP-binding domains may also harbor selectivity for a membrane physical property such as charge or membrane curvature. This review summarizes the current understanding of the cellular distribution of PIPs and their molecular interaction with peripheral proteins.
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Affiliation(s)
- Robert V Stahelin
- Department of Biochemistry and Molecular Biology, Indiana University School of Medicine-South Bend, South Bend, IN 46617, United States; Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, United States; Mike and Josie Harper Cancer Research Institute, University of Notre Dame, Notre Dame, IN 46556, United States.
| | - Jordan L Scott
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, United States; Mike and Josie Harper Cancer Research Institute, University of Notre Dame, Notre Dame, IN 46556, United States
| | - Cary T Frick
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, IN 46556, United States
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26
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Lu Y, Li C, Wang D, Su X, Jin C, Li Y, Li T. Characterization of two negative regulators of the Toll-like receptor pathway in Apostichopus japonicus: inhibitor of NF-κB and Toll-interacting protein. FISH & SHELLFISH IMMUNOLOGY 2013; 35:1663-1669. [PMID: 23978566 DOI: 10.1016/j.fsi.2013.08.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2013] [Revised: 08/08/2013] [Accepted: 08/14/2013] [Indexed: 06/02/2023]
Abstract
The Toll-like receptor (TLR) signaling cascade plays a central role in host cell recognition and responses to microbial pathogens via the specific recognition of distinct pathogen-associated molecular patterns (PAMPs). However, no negative regulators of the TLR-signaling cascade have been described in sea cucumber (Apostichopus japonicus). In the present study, two negative regulators known as the inhibitor of NF-κB (IκB) and Toll-interacting protein (Tollip) have been identified in coelomocytes of this species using transcriptome sequencing and RACE (denoted as AjIκB and AjTollip, respectively). Both of these factors share a remarkably high degree of structural conservation with their mammalian orthologs, such as a central ankyrin repeat domain (ARD) for the deduced amino acids of AjIκB and the C2 and CUE domains for AjTollip. Constitutive expression patterns with differential expression levels were observed for these two genes. Moreover, mRNA transcript expression for AjIκB and AjTollip was highest in the tentacle and abundant in the muscle, respectively. Vibrio splendidus challenge study revealed that the expression level of these two genes was decreased within the first 48 h with 0.53-fold and 0.61-fold decrease compared with that in the control group for AjIκB and AjTollip, respectively. Taken together, these results indicated that AjIκB and AjTollip functioned as negative regulators in the TLR cascade in response to a V. splendidus challenge.
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Affiliation(s)
- Yali Lu
- School of Marine Sciences, Ningbo University, Ningbo, Zhejiang Province 315211, PR China
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Sun Y, Li H, Sun MJ, Zheng YY, Gong DJ, Xu Y. Endotoxin Tolerance Induced by Lipopolysaccharides Derived from Porphyromonas gingivalis and Escherichia coli: Alternations in Toll-Like Receptor 2 and 4 Signaling Pathway. Inflammation 2013; 37:268-76. [DOI: 10.1007/s10753-013-9737-5] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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28
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Mitra S, Traughber CA, Brannon MK, Gomez S, Capelluto DGS. Ubiquitin interacts with the Tollip C2 and CUE domains and inhibits binding of Tollip to phosphoinositides. J Biol Chem 2013; 288:25780-25791. [PMID: 23880770 DOI: 10.1074/jbc.m113.484170] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
A large number of cellular signaling processes are directed through internalization, via endocytosis, of polyubiquitinated cargo proteins. Tollip is an adaptor protein that facilitates endosomal cargo sorting for lysosomal degradation. Tollip preferentially binds phosphatidylinositol 3-phosphate (PtdIns(3)P) via its C2 domain, an association that may be required for endosomal membrane targeting. Here, we show that Tollip binds ubiquitin through its C2 and CUE domains and that its association with the C2 domain inhibits PtdIns(3)P binding. NMR analysis demonstrates that the C2 and CUE domains bind to overlapping sites on ubiquitin, suggesting that two ubiquitin molecules associate with Tollip simultaneously. Hydrodynamic studies reveal that ubiquitin forms heterodimers with the CUE domain, indicating that the association disrupts the dimeric state of the CUE domain. We propose that, in the absence of polyubiquitinated cargo, the dual binding of ubiquitin partitions Tollip into membrane-bound and membrane-free states, a function that contributes to the engagement of Tollip in both membrane trafficking and cytosolic pathways.
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Affiliation(s)
- Sharmistha Mitra
- From the Department of Biological Sciences, Protein Signaling Domains Laboratory, Virginia Tech, Blacksburg, Virginia 24061
| | - C Alicia Traughber
- From the Department of Biological Sciences, Protein Signaling Domains Laboratory, Virginia Tech, Blacksburg, Virginia 24061
| | - Mary K Brannon
- From the Department of Biological Sciences, Protein Signaling Domains Laboratory, Virginia Tech, Blacksburg, Virginia 24061
| | - Stephanie Gomez
- From the Department of Biological Sciences, Protein Signaling Domains Laboratory, Virginia Tech, Blacksburg, Virginia 24061
| | - Daniel G S Capelluto
- From the Department of Biological Sciences, Protein Signaling Domains Laboratory, Virginia Tech, Blacksburg, Virginia 24061.
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Wang PH, Gu ZH, Wan DH, Zhu WB, Qiu W, Chen YG, Weng SP, Yu XQ, He JG. Litopenaeus vannamei Toll-interacting protein (LvTollip) is a potential negative regulator of the shrimp Toll pathway involved in the regulation of the shrimp antimicrobial peptide gene penaeidin-4 (PEN4). DEVELOPMENTAL AND COMPARATIVE IMMUNOLOGY 2013; 40:266-277. [PMID: 23500511 DOI: 10.1016/j.dci.2013.02.011] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/01/2013] [Revised: 02/19/2013] [Accepted: 02/22/2013] [Indexed: 06/01/2023]
Abstract
The Toll-like receptor (TLR)-nuclear factor (NF)-κB signaling pathway is evolutionarily conserved from insects to mammals as a regulator of the expression of immune-related genes. In mammals, TLR-NF-κB signaling is tightly controlled because excessive activation of this pathway can result in severe damage to the host. The mammalian Toll-interacting protein (Tollip) has an important function in the negative regulation of this pathway, but no reports about invertebrate Tollip have been published to date. In this study, we cloned Litopenaeus vannamei Tollip (LvTollip) and investigated its function in the regulation of the NF-κB pathway-controlled antimicrobial peptide genes (AMPs). The LvTollip full-length cDNA is 1231bp long and contains an open reading frame of 813bp that encodes a 270-amino acid protein. LvTollip shares significant similarities to mammalian Tollips, which contain a centrally localized protein kinase C conserved region 2 (C2) domain and a C-terminal CUE domain. After challenges with the white spot syndrome virus (WSSV) or Vibrio alginolyticus, the expression levels of LvTollip were altered in the gill, hemocyte, hepatopancreatic, intestinal, and muscle tissues. In Drosophila S2 cells, LvTollip localized in the membrane and the cytoplasm and significantly inhibited the promoter activities of the NF-κB pathway-controlled AMP penaeidin-4 (PEN4). In LvTollip-knockdown shrimp, the expression level of AMP PEN4 was increased. However, the mortality rates of LvTollip-knockdown shrimp in response to WSSV or V. alginolyticus infections were not significantly different from those of the control group. Our results suggested that LvTollip might be involved in the negative regulation of PEN4 and that LvTollip expression was responsive to microbial infections.
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Affiliation(s)
- Pei-Hui Wang
- MOE Key Laboratory of Aquatic Product Safety/State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-Sen University, 135 Xingang Road West, Guangzhou 510275, People's Republic of China.
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30
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Shah JA, Vary JC, Chau TTH, Bang ND, Yen NTB, Farrar JJ, Dunstan SJ, Hawn TR. Human TOLLIP regulates TLR2 and TLR4 signaling and its polymorphisms are associated with susceptibility to tuberculosis. THE JOURNAL OF IMMUNOLOGY 2012; 189:1737-46. [PMID: 22778396 DOI: 10.4049/jimmunol.1103541] [Citation(s) in RCA: 100] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Tuberculosis, one of the leading causes of death worldwide, stimulates inflammatory responses with beneficial and pathologic consequences. The regulation and nature of an optimal inflammatory response to Mycobacterium tuberculosis remains poorly understood in humans. Insight into mechanisms of negative regulation of the TLR-mediated innate immune response to M. tuberculosis could provide significant breakthroughs in the design of new vaccines and drugs. We hypothesized that TOLLIP and its common variants negatively regulate TLR signaling in human monocytes and are associated with susceptibility to tuberculosis. Using short hairpin RNA knockdown of TOLLIP in peripheral blood human monocytes, we found that TOLLIP suppresses TNF and IL-6 production after stimulation with TLR2 and TLR4 ligands. In contrast, secretion of the anti-inflammatory cytokine IL-10 was induced by TOLLIP. We also discovered two common polymorphisms that are associated with either decreased levels of mRNA expression (rs3750920) or increased IL-6 production (rs5743899) in a sample of 56 healthy volunteers. Furthermore, in a case-population study in Vietnam with 760 cord blood samples and 671 TB case patients, we found that SNPs rs3750920 and rs5743899 were associated with susceptibility to tuberculosis (p = 7.03 × 10(-16) and 6.97 × 10(-7), respectively). These data demonstrate that TOLLIP has an anti-inflammatory effect on TLR signaling in humans and that TOLLIP deficiency is associated with an increased risk of tuberculosis. To our knowledge, these data also show the first associations of TOLLIP polymorphisms with any infectious disease. These data also implicate an unexpected mechanism of negative regulation of TLR signaling in human tuberculosis pathogenesis.
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Affiliation(s)
- Javeed A Shah
- Division of Allergy and Infectious Diseases, University of Washington, Seattle, WA 98195, USA.
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31
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Tollip: a multitasking protein in innate immunity and protein trafficking. Microbes Infect 2011; 14:140-7. [PMID: 21930231 DOI: 10.1016/j.micinf.2011.08.018] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2011] [Revised: 08/28/2011] [Accepted: 08/29/2011] [Indexed: 11/23/2022]
Abstract
The Toll-interacting protein (Tollip) is a critical regulator of Toll-like receptor (TLR)-mediated innate immune responses. Tollip modulates TLR signaling and membrane trafficking processes through its interaction with both proteins and phosphoinositides. Here, I discuss the multitasking role of Tollip associated with its modular architecture.
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