1
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David H, Vasudevan S, Solomon AP. Mitigating candidiasis with acarbose by targeting Candida albicans α-glucosidase: in-silico, in-vitro and transcriptomic approaches. Sci Rep 2024; 14:11890. [PMID: 38789465 PMCID: PMC11126738 DOI: 10.1038/s41598-024-62684-x] [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: 11/28/2023] [Accepted: 05/20/2024] [Indexed: 05/26/2024] Open
Abstract
Biofilm-associated candidiasis poses a significant challenge in clinical settings due to the limited effectiveness of existing antifungal treatments. The challenges include increased pathogen virulence, multi-drug resistance, and inadequate penetration of antimicrobials into biofilm structures. One potential solution to this problem involves the development of novel drugs that can modulate fungal virulence and biofilm formation, which is essential for pathogenesis. Resistance in Candida albicans is initiated by morphological changes from yeast to hyphal form. This transition triggers a series of events such as cell wall elongation, increased adhesion, invasion of host tissues, pathogenicity, biofilm formation, and the initiation of an immune response. The cell wall is a critical interface for interactions with host cells, primarily through various cell wall proteins, particularly mannoproteins. Thus, cell wall proteins and enzymes are considered potential antifungal targets. In this regard, we explored α-glucosidase as our potential target which plays a crucial role in processing mannoproteins. Previous studies have shown that inhibition of α-glucosidase leads to defects in cell wall integrity, reduced adhesion, diminished secretion of hydrolytic enzymes, alterations in immune recognition, and reduced pathogenicity. Since α-glucosidase, primarily converts carbohydrates, our study focuses on FDA-approved carbohydrate mimic drugs (Glycomimetics) with well-documented applications in various biological contexts. Through virtual screening of 114 FDA-approved carbohydrate-based drugs, a pseudo-sugar Acarbose, emerged as a top hit. Acarbose is known for its pharmacological potential in managing type 2 diabetes mellitus by targeting α-glucosidase. Our preliminary investigations indicate that Acarbose effectively inhibits C. albicans biofilm formation, reduces virulence, impairs morphological switching, and hinders the adhesion and invasion of host cells, all at very low concentrations in the nanomolar range. Furthermore, transcriptomic analysis reveals the mechanism of action of Acarbose, highlighting its role in targeting α-glucosidase.
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Affiliation(s)
- Helma David
- Quorum Sensing Laboratory, Centre for Research in Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed to be University, Thanjavur, 613401, India
| | - Sahana Vasudevan
- Quorum Sensing Laboratory, Centre for Research in Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed to be University, Thanjavur, 613401, India.
- Institute for Stem Cell Science and Regenerative Medicine (inStem), Bangalore, 560065, India.
| | - Adline Princy Solomon
- Quorum Sensing Laboratory, Centre for Research in Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed to be University, Thanjavur, 613401, India.
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2
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Roberts BS, Mitra D, Abishek S, Beher R, Satpute-Krishnan P. The p24-family and COPII subunit SEC24C facilitate the clearance of alpha1-antitrypsin Z from the endoplasmic reticulum to lysosomes. Mol Biol Cell 2024; 35:ar45. [PMID: 38294851 PMCID: PMC10916869 DOI: 10.1091/mbc.e23-06-0257] [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: 07/03/2023] [Revised: 01/16/2024] [Accepted: 01/24/2024] [Indexed: 02/01/2024] Open
Abstract
A subpopulation of the alpha-1-antitrypsin misfolding Z mutant (ATZ) is cleared from the endoplasmic reticulum (ER) via an ER-to-lysosome-associated degradation (ERLAD) pathway. Here, we report that the COPII subunit SEC24C and the p24-family of proteins facilitate the clearance of ATZ via ERLAD. In addition to the previously reported ERLAD components calnexin and FAM134B, we discovered that ATZ coimmunoprecipitates with the p24-family members TMP21 and TMED9. This contrasts with wild type alpha1-antitrypsin, which did not coimmunoprecipitate with FAM134B, calnexin or the p24-family members. Live-cell imaging revealed that ATZ and the p24-family members traffic together from the ER to lysosomes. Using chemical inhibitors to block ER exit or autophagy, we demonstrated that p24-family members and ATZ co-accumulate at SEC24C marked ER-exit sites or in ER-derived compartments, respectively. Furthermore, depletion of SEC24C, TMP21, or TMED9 inhibited lysosomal trafficking of ATZ and resulted in the increase of intracellular ATZ levels. Conversely, overexpression of these p24-family members resulted in the reduction of ATZ levels. Intriguingly, the p24-family members coimmunoprecipitate with ATZ, FAM134B, and SEC24C. Thus, we propose a model in which the p24-family functions in an adaptor complex linking SEC24C with the ERLAD machinery for the clearance of ATZ.
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Affiliation(s)
| | - Debashree Mitra
- Uniformed Services University of the Health Sciences, Bethesda, MD 20814
| | - Sudhanshu Abishek
- Uniformed Services University of the Health Sciences, Bethesda, MD 20814
| | - Richa Beher
- Uniformed Services University of the Health Sciences, Bethesda, MD 20814
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3
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Daskivich GJ, Brodsky JL. The generation of detergent-insoluble clipped fragments from an ERAD substrate in mammalian cells. Sci Rep 2023; 13:21508. [PMID: 38057493 PMCID: PMC10700608 DOI: 10.1038/s41598-023-48769-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2023] [Accepted: 11/30/2023] [Indexed: 12/08/2023] Open
Abstract
Proteostasis ensures the proper synthesis, folding, and trafficking of proteins and is required for cellular and organellar homeostasis. This network also oversees protein quality control within the cell and prevents accumulation of aberrant proteins, which can lead to cellular dysfunction and disease. For example, protein aggregates irreversibly disrupt proteostasis and can exert gain-of-function toxic effects. Although this process has been examined in detail for cytosolic proteins, how endoplasmic reticulum (ER)-tethered, aggregation-prone proteins are handled is ill-defined. To determine how a membrane protein with a cytoplasmic aggregation-prone domain is routed for ER-associated degradation (ERAD), we analyzed a new model substrate, TM-Ubc9ts. In yeast, we previously showed that TM-Ubc9ts ERAD requires Hsp104, which is absent in higher cells. In transient and stable HEK293 cells, we now report that TM-Ubc9ts degradation is largely proteasome-dependent, especially at elevated temperatures. In contrast to yeast, clipped TM-Ubc9ts polypeptides, which are stabilized upon proteasome inhibition, accumulate and are insoluble at elevated temperatures. TM-Ubc9ts cleavage is independent of the intramembrane protease RHBDL4, which clips other classes of ERAD substrates. These studies highlight an unappreciated mechanism underlying the degradation of aggregation-prone substrates in the ER and invite further work on other proteases that contribute to ERAD.
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Affiliation(s)
- Grant J Daskivich
- A320 Langley Hall, Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, 15260, USA
| | - Jeffrey L Brodsky
- A320 Langley Hall, Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA, 15260, USA.
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4
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Son SH, Lee J, Cho SN, Choi JA, Kim J, Nguyen TD, Lee SA, Son D, Song CH. Herp regulates intracellular survival of Mycobacterium tuberculosis H37Ra in macrophages by regulating reactive oxygen species-mediated autophagy. mBio 2023; 14:e0153523. [PMID: 37800958 PMCID: PMC10653826 DOI: 10.1128/mbio.01535-23] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Accepted: 08/21/2023] [Indexed: 10/07/2023] Open
Abstract
IMPORTANCE Several studies have suggested that endoplasmic reticulum (ER) stress is important in the pathogenesis of infectious diseases; however, the precise function of ER stress regulation and the role of Herp as a regulator in Mtb H37Ra-induced ER stress remain elusive. Therefore, our study investigated ER stress and autophagy associated with Herp expression in Mycobacterium tuberculosis-infected macrophages to determine the role of Herp in the pathogenesis of tuberculosis.
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Affiliation(s)
- Sang-Hun Son
- Department of Microbiology, College of Medicine, Chungnam National University, Daejeon, South Korea
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, South Korea
| | - Junghwan Lee
- Department of Microbiology, College of Medicine, Chungnam National University, Daejeon, South Korea
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, South Korea
- Translational Immunology Institute, Chungnam National University, Daejeon, South Korea
| | - Soo-Na Cho
- Department of Microbiology, College of Medicine, Chungnam National University, Daejeon, South Korea
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, South Korea
| | - Ji-Ae Choi
- Department of Microbiology, College of Medicine, Chungnam National University, Daejeon, South Korea
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, South Korea
- Translational Immunology Institute, Chungnam National University, Daejeon, South Korea
| | - Jaewhan Kim
- Department of Microbiology, College of Medicine, Chungnam National University, Daejeon, South Korea
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, South Korea
| | - Tam Doan Nguyen
- Department of Microbiology, College of Medicine, Chungnam National University, Daejeon, South Korea
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, South Korea
| | - Seong-Ahn Lee
- Department of Microbiology, College of Medicine, Chungnam National University, Daejeon, South Korea
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, South Korea
| | - Doyi Son
- Department of Microbiology, College of Medicine, Chungnam National University, Daejeon, South Korea
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, South Korea
| | - Chang-Hwa Song
- Department of Microbiology, College of Medicine, Chungnam National University, Daejeon, South Korea
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, South Korea
- Translational Immunology Institute, Chungnam National University, Daejeon, South Korea
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5
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Cheatham AM, Sharma NR, Satpute-Krishnan P. Competition for calnexin binding regulates secretion and turnover of misfolded GPI-anchored proteins. J Cell Biol 2023; 222:e202108160. [PMID: 37702712 PMCID: PMC10499038 DOI: 10.1083/jcb.202108160] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2021] [Revised: 03/19/2023] [Accepted: 08/10/2023] [Indexed: 09/14/2023] Open
Abstract
In mammalian cells, misfolded glycosylphosphatidylinositol (GPI)-anchored proteins (GPI-APs) are cleared out of the ER to the Golgi via a constitutive and a stress-inducible pathway called RESET. From the Golgi, misfolded GPI-APs transiently access the cell surface prior to rapid internalization for lysosomal degradation. What regulates the release of misfolded GPI-APs for RESET during steady-state conditions and how this release is accelerated during ER stress is unknown. Using mutants of prion protein or CD59 as model misfolded GPI-APs, we demonstrate that inducing calnexin degradation or upregulating calnexin-binding glycoprotein expression triggers the release of misfolded GPI-APs for RESET. Conversely, blocking protein synthesis dramatically inhibits the dissociation of misfolded GPI-APs from calnexin and subsequent turnover. We demonstrate an inverse correlation between newly synthesized calnexin substrates and RESET substrates that coimmunoprecipitate with calnexin. These findings implicate competition by newly synthesized substrates for association with calnexin as a key factor in regulating the release of misfolded GPI-APs from calnexin for turnover via the RESET pathway.
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Affiliation(s)
- Amber M. Cheatham
- Department of Biochemistry and Molecular Biology, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Nishi Raj Sharma
- Department of Biochemistry and Molecular Biology, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
| | - Prasanna Satpute-Krishnan
- Department of Biochemistry and Molecular Biology, Uniformed Services University of the Health Sciences, Bethesda, MD, USA
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6
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Hill MA, Sykes AM, Mellick GD. ER-phagy in neurodegeneration. J Neurosci Res 2023; 101:1611-1623. [PMID: 37334842 DOI: 10.1002/jnr.25225] [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: 02/20/2023] [Revised: 05/11/2023] [Accepted: 05/31/2023] [Indexed: 06/21/2023]
Abstract
There are many cellular mechanisms implicated in the initiation and progression of neurodegenerative disorders. However, age and the accumulation of unwanted cellular products are a common theme underlying many neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, and Niemann-Pick type C. Autophagy has been studied extensively in these diseases and various genetic risk factors have implicated disruption in autophagy homoeostasis as a major pathogenic mechanism. Autophagy is essential in the maintenance of neuronal homeostasis, as their postmitotic nature makes them particularly susceptible to the damage caused by accumulation of defective or misfolded proteins, disease-prone aggregates, and damaged organelles. Recently, autophagy of the endoplasmic reticulum (ER-phagy) has been identified as a novel cellular mechanism for regulating ER morphology and response to cellular stress. As neurodegenerative diseases are generally precipitated by cellular stressors such as protein accumulation and environmental toxin exposure the role of ER-phagy has begun to be investigated. In this review we discuss the current research in ER-phagy and its involvement in neurodegenerative diseases.
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Affiliation(s)
- Melissa A Hill
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland, Australia
| | - Alex M Sykes
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland, Australia
| | - George D Mellick
- Griffith Institute for Drug Discovery, Griffith University, Nathan, Queensland, Australia
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7
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Cremer T, Voortman LM, Bos E, Jongsma MLM, ter Haar LR, Akkermans JJLL, Talavera Ormeño CMP, Wijdeven RHM, de Vries J, Kim RQ, Janssen GMC, van Veelen PA, Koning RI, Neefjes J, Berlin I. RNF26 binds perinuclear vimentin filaments to integrate ER and endolysosomal responses to proteotoxic stress. EMBO J 2023; 42:e111252. [PMID: 37519262 PMCID: PMC10505911 DOI: 10.15252/embj.2022111252] [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: 03/23/2022] [Revised: 06/28/2023] [Accepted: 07/03/2023] [Indexed: 08/01/2023] Open
Abstract
Proteotoxic stress causes profound endoplasmic reticulum (ER) membrane remodeling into a perinuclear quality control compartment (ERQC) for the degradation of misfolded proteins. Subsequent return to homeostasis involves clearance of the ERQC by endolysosomes. However, the factors that control perinuclear ER integrity and dynamics remain unclear. Here, we identify vimentin intermediate filaments as perinuclear anchors for the ER and endolysosomes. We show that perinuclear vimentin filaments engage the ER-embedded RING finger protein 26 (RNF26) at the C-terminus of its RING domain. This restricts RNF26 to perinuclear ER subdomains and enables the corresponding spatial retention of endolysosomes through RNF26-mediated membrane contact sites (MCS). We find that both RNF26 and vimentin are required for the perinuclear coalescence of the ERQC and its juxtaposition with proteolytic compartments, which facilitates efficient recovery from ER stress via the Sec62-mediated ER-phagy pathway. Collectively, our findings reveal a scaffolding mechanism that underpins the spatiotemporal integration of organelles during cellular proteostasis.
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Affiliation(s)
- Tom Cremer
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
- Oncode Institute, Leiden University Medical CenterLeidenThe Netherlands
| | - Lenard M Voortman
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
| | - Erik Bos
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
| | - Marlieke LM Jongsma
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
- Oncode Institute, Leiden University Medical CenterLeidenThe Netherlands
| | - Laurens R ter Haar
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
| | - Jimmy JLL Akkermans
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
- Oncode Institute, Leiden University Medical CenterLeidenThe Netherlands
| | - Cami MP Talavera Ormeño
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
| | - Ruud HM Wijdeven
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
- Oncode Institute, Leiden University Medical CenterLeidenThe Netherlands
- Alzheimer Center Amsterdam, Department of Neurology, Amsterdam NeuroscienceAmsterdam University Medical CenterAmsterdamThe Netherlands
| | - Jelle de Vries
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
| | - Robbert Q Kim
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
| | - George MC Janssen
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
| | - Peter A van Veelen
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
| | - Roman I Koning
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
| | - Jacques Neefjes
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
- Oncode Institute, Leiden University Medical CenterLeidenThe Netherlands
| | - Ilana Berlin
- Department of Cell and Chemical BiologyLeiden University Medical CenterLeidenThe Netherlands
- Oncode Institute, Leiden University Medical CenterLeidenThe Netherlands
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8
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Erzurumlu Y, Dogan HK, Catakli D, Aydogdu E, Muhammed MT. Estrogens drive the endoplasmic reticulum-associated degradation and promote proto-oncogene c-Myc expression in prostate cancer cells by androgen receptor/estrogen receptor signaling. J Cell Commun Signal 2023; 17:793-811. [PMID: 36696010 PMCID: PMC10409964 DOI: 10.1007/s12079-022-00720-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2022] [Accepted: 12/21/2022] [Indexed: 01/26/2023] Open
Abstract
The tumorigenic properties of prostate cancer are regulated by advanced hormonal regulation-mediated complex molecular signals. Therefore, characterizing the regulation of these signal transduction systems is crucial for understanding prostate cancer biology. Recent studies have shown that endoplasmic reticulum (ER)-localized protein quality control mechanisms, including ER-associated degradation (ERAD) and unfolded protein response (UPR) signaling contribute to prostate carcinogenesis and to the development of drug resistance. It has also been determined that these systems are tightly regulated by androgens. However, the role of estrogenic signaling in prostate cancer and its effects on protein quality control mechanisms is not fully understood. Herein, we investigated the regulatory effects of estrogens on ERAD and UPR and their impacts on prostate carcinogenesis. We found that estrogens strongly regulated the ERAD components and IRE1⍺ branch of UPR by Er⍺/β/AR axis. Besides, estrogenic signaling rigorously regulated the tumorigenicity of prostate cancer cells by promoting c-Myc expression and epithelial-mesenchymal transition (EMT). Moreover, estrogenic signal blockage significantly decreased the tumorigenic features of prostate cancer cells. Additionally, simultaneous inhibition of androgenic/estrogenic signals more efficiently inhibited tumorigenicity of prostate cancer cells, including proliferation, migration, invasion and colonial growth. Furthermore, computational-based molecular docking, molecular dynamics simulations and MMPBSA calculations supported the estrogenic stimulation of AR. Present findings suggested that ERAD components and IRE1⍺ signaling are tightly regulated by estrogen-stimulated AR and Er⍺/β. Our data suggest that treatment approaches targeting the co-inhibition of androgenic/estrogenic signals may pave the way for new treatment approaches to be developed for prostate cancer. The present model of the impact of estrogens on ERAD and UPR signaling in androgen-sensitive prostate cancer cells.
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Affiliation(s)
- Yalcin Erzurumlu
- Department of Biochemistry, Faculty of Pharmacy, Suleyman Demirel University, 32260 Isparta, Turkey
| | - Hatice Kubra Dogan
- Department of Bioengineering, Institute of Science, Suleyman Demirel University, 32260 Isparta, Turkey
| | - Deniz Catakli
- Department of Pharmacology, Faculty of Medicine, Suleyman Demirel University, 32260 Isparta, Turkey
| | - Esra Aydogdu
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Suleyman Demirel University, 32260 Isparta, Turkey
| | - Muhammed Tilahun Muhammed
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Suleyman Demirel University, 32260 Isparta, Turkey
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9
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Verjan Garcia N, Hong KU, Matoba N. The Unfolded Protein Response and Its Implications for Novel Therapeutic Strategies in Inflammatory Bowel Disease. Biomedicines 2023; 11:2066. [PMID: 37509705 PMCID: PMC10377089 DOI: 10.3390/biomedicines11072066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2023] [Accepted: 07/20/2023] [Indexed: 07/30/2023] Open
Abstract
The endoplasmic reticulum (ER) is a multifunctional organelle playing a vital role in maintaining cell homeostasis, and disruptions to its functions can have detrimental effects on cells. Dysregulated ER stress and the unfolded protein response (UPR) have been linked to various human diseases. For example, ER stress and the activation of the UPR signaling pathways in intestinal epithelial cells can either exacerbate or alleviate the severity of inflammatory bowel disease (IBD), contingent on the degree and conditions of activation. Our recent studies have shown that EPICERTIN, a recombinant variant of the cholera toxin B subunit containing an ER retention motif, can induce a protective UPR in colon epithelial cells, subsequently promoting epithelial restitution and mucosal healing in IBD models. These findings support the idea that compounds modulating UPR may be promising pharmaceutical candidates for the treatment of the disease. In this review, we summarize our current understanding of the ER stress and UPR in IBD, focusing on their roles in maintaining cell homeostasis, dysregulation, and disease pathogenesis. Additionally, we discuss therapeutic strategies that promote the cytoprotection of colon epithelial cells and reduce inflammation via pharmacological manipulation of the UPR.
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Affiliation(s)
- Noel Verjan Garcia
- UofL Health-Brown Cancer Center, University of Louisville School of Medicine, Louisville, KY 40202, USA
| | - Kyung U Hong
- UofL Health-Brown Cancer Center, University of Louisville School of Medicine, Louisville, KY 40202, USA
- Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, KY 40202, USA
| | - Nobuyuki Matoba
- UofL Health-Brown Cancer Center, University of Louisville School of Medicine, Louisville, KY 40202, USA
- Department of Pharmacology and Toxicology, University of Louisville School of Medicine, Louisville, KY 40202, USA
- Center for Predictive Medicine, University of Louisville School of Medicine, Louisville, KY 40202, USA
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10
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Badawi S, Mohamed FE, Varghese DS, Ali BR. Genetic disruption of mammalian endoplasmic reticulum-associated protein degradation: Human phenotypes and animal and cellular disease models. Traffic 2023. [PMID: 37188482 DOI: 10.1111/tra.12902] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Revised: 04/28/2023] [Accepted: 05/02/2023] [Indexed: 05/17/2023]
Abstract
Endoplasmic reticulum-associated protein degradation (ERAD) is a stringent quality control mechanism through which misfolded, unassembled and some native proteins are targeted for degradation to maintain appropriate cellular and organelle homeostasis. Several in vitro and in vivo ERAD-related studies have provided mechanistic insights into ERAD pathway activation and its consequent events; however, a majority of these have investigated the effect of ERAD substrates and their consequent diseases affecting the degradation process. In this review, we present all reported human single-gene disorders caused by genetic variation in genes that encode ERAD components rather than their substrates. Additionally, after extensive literature survey, we present various genetically manipulated higher cellular and mammalian animal models that lack specific components involved in various stages of the ERAD pathway.
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Affiliation(s)
- Sally Badawi
- Department of Genetics and Genomics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Feda E Mohamed
- Department of Genetics and Genomics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Divya Saro Varghese
- Department of Genetics and Genomics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
| | - Bassam R Ali
- Department of Genetics and Genomics, College of Medicine and Health Sciences, United Arab Emirates University, Al Ain, United Arab Emirates
- ASPIRE Precision Medicine Research Institute Abu Dhabi, United Arab Emirates University, Al Ain, United Arab Emirates
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11
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Kotler JLM, Street TO. Mechanisms of Protein Quality Control in the Endoplasmic Reticulum by a Coordinated Hsp40-Hsp70-Hsp90 System. Annu Rev Biophys 2023; 52:509-524. [PMID: 37159299 DOI: 10.1146/annurev-biophys-111622-091309] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The Hsp40, Hsp70, and Hsp90 chaperone families are ancient, highly conserved, and critical to cellular protein homeostasis. Hsp40 chaperones can transfer their protein clients to Hsp70, and Hsp70 can transfer clients to Hsp90, but the functional benefits of these transfers are unclear. Recent structural and mechanistic work has opened up the possibility of uncovering how Hsp40, Hsp70, and Hsp90 work together as unified system. In this review, we compile mechanistic data on the ER J-domain protein 3 (ERdj3) (an Hsp40), BiP (an Hsp70), and Grp94 (an Hsp90) chaperones within the endoplasmic reticulum; what is known about how these chaperones work together; and gaps in this understanding. Using calculations, we examine how client transfer could impact the solubilization of aggregates, the folding of soluble proteins, and the triage decisions by which proteins are targeted for degradation. The proposed roles of client transfer among Hsp40-Hsp70-Hsp90 chaperones are new hypotheses, and we discuss potential experimental tests of these ideas.
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Affiliation(s)
- Judy L M Kotler
- Department of Biochemistry, Brandeis University, Waltham, Massachusetts, USA;
| | - Timothy O Street
- Department of Biochemistry, Brandeis University, Waltham, Massachusetts, USA;
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12
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Wang J, Han S, Ye J. Topological regulation of a transmembrane protein by luminal-to-cytosolic retrotranslocation of glycosylated sequence. Cell Rep 2023; 42:112311. [PMID: 36972171 PMCID: PMC10520219 DOI: 10.1016/j.celrep.2023.112311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 02/02/2023] [Accepted: 03/11/2023] [Indexed: 03/28/2023] Open
Abstract
Transmembrane proteins must adopt proper topology to perform their functions. We previously demonstrated that ceramide regulates TM4SF20 (transmembrane 4 L6 family 20) by altering the topology of the transmembrane protein, but the underlying mechanism remains obscure. Here we report that TM4SF20 is synthesized in the endoplasmic reticulum (ER) with a cytosolic C terminus and a luminal loop before the last transmembrane helix where N132, N148, and N163 are glycosylated. In the absence of ceramide, the sequence surrounding glycosylated N163 but not N132 is retrotranslocated from lumen to cytosol independent of ER-associated degradation. Accompanying this retrotranslocation, the C terminus of the protein is relocated from cytosol to lumen. Ceramide delays the retrotranslocation process, causing accumulation of the protein that is originally synthesized. Our findings suggest that N-linked glycans, although synthesized in the lumens, may be exposed to cytosol through retrotranslocation, a reaction that may play a crucial role in topological regulation of transmembrane proteins.
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Affiliation(s)
- Jingcheng Wang
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Sungwon Han
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA
| | - Jin Ye
- Department of Molecular Genetics, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
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13
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Nellore A, Zumaquero E, Scharer CD, Fucile CF, Tipton CM, King RG, Mi T, Mousseau B, Bradley JE, Zhou F, Mutneja S, Goepfert PA, Boss JM, Randall TD, Sanz I, Rosenberg AF, Lund FE. A transcriptionally distinct subset of influenza-specific effector memory B cells predicts long-lived antibody responses to vaccination in humans. Immunity 2023; 56:847-863.e8. [PMID: 36958335 PMCID: PMC10113805 DOI: 10.1016/j.immuni.2023.03.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 09/20/2022] [Accepted: 02/28/2023] [Indexed: 03/25/2023]
Abstract
Seasonal influenza vaccination elicits hemagglutinin (HA)-specific memory B (Bmem) cells, and although multiple Bmem cell populations have been characterized, considerable heterogeneity exists. We found that HA-specific human Bmem cells differed in the expression of surface marker FcRL5 and transcriptional factor T-bet. FcRL5+T-bet+ Bmem cells were transcriptionally similar to effector-like memory cells, while T-betnegFcRL5neg Bmem cells exhibited stem-like central memory properties. FcRL5+ Bmem cells did not express plasma-cell-commitment factors but did express transcriptional, epigenetic, metabolic, and functional programs that poised these cells for antibody production. Accordingly, HA+ T-bet+ Bmem cells at day 7 post-vaccination expressed intracellular immunoglobulin, and tonsil-derived FcRL5+ Bmem cells differentiated more rapidly into antibody-secreting cells (ASCs) in vitro. The T-bet+ Bmem cell response positively correlated with long-lived humoral immunity, and clonotypes from T-bet+ Bmem cells were represented in the secondary ASC response to repeat vaccination, suggesting that this effector-like population predicts influenza vaccine durability and recall potential.
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Affiliation(s)
- Anoma Nellore
- Department of Medicine, Division of Infectious Disease, The University of Alabama at Birmingham, Birmingham, AL 35294, USA.
| | - Esther Zumaquero
- Department of Microbiology, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Christopher D Scharer
- Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Christopher F Fucile
- Informatics Institute, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Christopher M Tipton
- Department of Medicine, Division of Rheumatology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - R Glenn King
- Department of Microbiology, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Tian Mi
- Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Betty Mousseau
- Department of Microbiology, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - John E Bradley
- Department of Medicine, Division of Clinical Immunology and Rheumatology at The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Fen Zhou
- Department of Microbiology, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Stuti Mutneja
- Department of Medicine, Division of Infectious Disease, The University of Alabama at Birmingham, Birmingham, AL 35294, USA; ImmuneID, Waltham, MA 02451, USA
| | - Paul A Goepfert
- Department of Medicine, Division of Infectious Disease, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Jeremy M Boss
- Department of Microbiology and Immunology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Troy D Randall
- Department of Medicine, Division of Clinical Immunology and Rheumatology at The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Ignacio Sanz
- Department of Medicine, Division of Rheumatology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Alexander F Rosenberg
- Department of Microbiology, The University of Alabama at Birmingham, Birmingham, AL 35294, USA; Informatics Institute, The University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Frances E Lund
- Department of Microbiology, The University of Alabama at Birmingham, Birmingham, AL 35294, USA.
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14
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Absmeier RM, Rottenaicher GJ, Svilenov HL, Kazman P, Buchner J. Antibodies gone bad - the molecular mechanism of light chain amyloidosis. FEBS J 2023; 290:1398-1419. [PMID: 35122394 DOI: 10.1111/febs.16390] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 01/19/2022] [Accepted: 02/03/2022] [Indexed: 12/19/2022]
Abstract
Light chain amyloidosis (AL) is a systemic disease in which abnormally proliferating plasma cells secrete large amounts of mutated antibody light chains (LCs) that eventually form fibrils. The fibrils are deposited in various organs, most often in the heart and kidney, and impair their function. The prognosis for patients diagnosed with AL is generally poor. The disease is set apart from other amyloidoses by the huge number of patient-specific mutations in the disease-causing and fibril-forming protein. The molecular mechanisms that drive the aggregation of mutated LCs into fibrils have been enigmatic, which hindered the development of efficient diagnostics and therapies. In this review, we summarize our current knowledge on AL amyloidosis and discuss open issues.
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Affiliation(s)
- Ramona M Absmeier
- Center for Functional Protein Assemblies and Department of Chemistry, Technische Universität München, Garching, Germany
| | - Georg J Rottenaicher
- Center for Functional Protein Assemblies and Department of Chemistry, Technische Universität München, Garching, Germany
| | - Hristo L Svilenov
- Center for Functional Protein Assemblies and Department of Chemistry, Technische Universität München, Garching, Germany
| | - Pamina Kazman
- Center for Functional Protein Assemblies and Department of Chemistry, Technische Universität München, Garching, Germany
| | - Johannes Buchner
- Center for Functional Protein Assemblies and Department of Chemistry, Technische Universität München, Garching, Germany
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15
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Zhang TM, Liao L, Yang SY, Huang MY, Zhang YL, Deng L, Hu SY, Yang F, Zhang FL, Shao ZM, Li DQ. TOLLIP-mediated autophagic degradation pathway links the VCP-TMEM63A-DERL1 signaling axis to triple-negative breast cancer progression. Autophagy 2023; 19:805-821. [PMID: 35920704 PMCID: PMC9980475 DOI: 10.1080/15548627.2022.2103992] [Citation(s) in RCA: 19] [Impact Index Per Article: 19.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
Triple-negative breast cancer (TNBC) is the most challenging breast cancer subtype to treat due to the lack of effective targeted therapies. Transmembrane (TMEM) proteins represent attractive drug targets for cancer therapy, but biological functions of most members of the TMEM family remain unknown. Here, we report for the first time that TMEM63A (transmembrane protein 63A), a poorly characterized TMEM protein with unknown functions in human cancer, functions as a novel oncogene to promote TNBC cell proliferation, migration, and invasion in vitro and xenograft tumor growth and lung metastasis in vivo. Mechanistic investigations revealed that TMEM63A localizes in endoplasmic reticulum (ER) and lysosome membranes, and interacts with VCP (valosin-containing protein) and its cofactor DERL1 (derlin 1). Furthermore, TMEM63A undergoes autophagy receptor TOLLIP-mediated autophagic degradation and is stabilized by VCP through blocking its lysosomal degradation. Strikingly, TMEM63A in turn stabilizes oncoprotein DERL1 through preventing TOLLIP-mediated autophagic degradation. Notably, pharmacological inhibition of VCP by CB-5083 or knockdown of DERL1 partially abolishes the oncogenic effects of TMEM63A on TNBC progression both in vitro and in vivo. Collectively, these findings uncover a previously unknown functional and mechanistic role for TMEM63A in TNBC progression and provide a new clue for targeting TMEM63A-driven TNBC tumors by using a VCP inhibitor.Abbreviations: ATG16L1, autophagy related 16 like 1; ATG5, autophagy related 5; ATP5F1B/ATP5B, ATP synthase F1 subunit beta; Baf-A1, bafilomycin A1; CALCOCO2/NDP52, calcium binding and coiled-coil domain 2; CANX, calnexin; DERL1, derlin 1; EGFR, epidermal growth factor receptor; ER, endoplasmic reticulum; ERAD, endoplasmic reticulum-associated degradation; HSPA8, heat shock protein family A (Hsp70) member 8; IP, immunoprecipitation; LAMP2A, lysosomal associated membrane protein 2; NBR1, NBR1 autophagy cargo receptor; OPTN, optineurin; RT-qPCR, reverse transcription-quantitative PCR; SQSTM1/p62, sequestosome 1; TAX1BP1, Tax1 binding protein 1; TMEM63A, transmembrane protein 63A; TNBC, triple-negative breast cancer; TOLLIP, toll interacting protein; VCP, valosin containing protein.
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Affiliation(s)
- Tai-Mei Zhang
- Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai Yangpu, China
| | - Li Liao
- Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai Yangpu, China.,Cancer Institute, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China
| | - Shao-Ying Yang
- Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai Yangpu, China
| | - Min-Ying Huang
- Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai Yangpu, China
| | - Yin-Ling Zhang
- Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai Yangpu, China.,Cancer Institute, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China
| | - Ling Deng
- Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai Yangpu, China
| | - Shu-Yuan Hu
- Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai Yangpu, China
| | - Fan Yang
- Department of Breast Surgery, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China
| | - Fang-Lin Zhang
- Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai Yangpu, China.,Cancer Institute, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China
| | - Zhi-Min Shao
- Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai Yangpu, China.,Cancer Institute, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China.,Department of Breast Surgery, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China.,Shanghai Key Laboratory of Breast Cancer, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China.,Shanghai Key Laboratory of Radiation Oncology, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China
| | - Da-Qiang Li
- Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences, Fudan University, Shanghai Yangpu, China.,Cancer Institute, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China.,Department of Oncology, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China.,Department of Breast Surgery, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China.,Shanghai Key Laboratory of Breast Cancer, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China.,Shanghai Key Laboratory of Radiation Oncology, Shanghai Medical College, Fudan University, Shanghai, Yangpu, China
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16
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Chino H, Mizushima N. ER-Phagy: Quality and Quantity Control of the Endoplasmic Reticulum by Autophagy. Cold Spring Harb Perspect Biol 2023; 15:cshperspect.a041256. [PMID: 35940904 PMCID: PMC9808580 DOI: 10.1101/cshperspect.a041256] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
The endoplasmic reticulum (ER) is the largest organelle and has multiple roles in various cellular processes such as protein secretion, lipid synthesis, calcium storage, and organelle biogenesis. The quantity and quality of this organelle are controlled by the ubiquitin-proteasome system and autophagy (termed "ER-phagy"). ER-phagy is defined as the degradation of part of the ER by the vacuole or lysosomes, and there are at least two types of ER-phagy: macro-ER-phagy and micro-ER-phagy. In macro-ER-phagy, ER fragments are enclosed by autophagosomes, which is mediated by ER-phagy receptors. In micro-ER-phagy, a portion of the ER is engulfed directly by the vacuole or lysosomes. In these two pathways, some proteins in the ER lumen can be recognized selectively and subjected to ER-phagy. This review summarizes our current knowledge of ER-phagy, focusing on its membrane dynamics, molecular mechanisms, substrate specificity, and physiological significance.
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Affiliation(s)
- Haruka Chino
- Department of Biochemistry and Molecular Biology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
| | - Noboru Mizushima
- Department of Biochemistry and Molecular Biology, Graduate School of Medicine, The University of Tokyo, Tokyo 113-0033, Japan
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17
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Ye J. Editorial: Insights in lipids, membranes and membranous organelles. Front Mol Biosci 2023; 10:1210167. [PMID: 37206889 PMCID: PMC10189112 DOI: 10.3389/fmolb.2023.1210167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2023] [Accepted: 04/26/2023] [Indexed: 05/21/2023] Open
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18
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Wang YJ, Di XJ, Mu TW. Quantitative interactome proteomics identifies a proteostasis network for GABA A receptors. J Biol Chem 2022; 298:102423. [PMID: 36030824 PMCID: PMC9493394 DOI: 10.1016/j.jbc.2022.102423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 08/17/2022] [Accepted: 08/19/2022] [Indexed: 11/29/2022] Open
Abstract
Gamma-aminobutyric acid type A (GABAA) receptors are the primary inhibitory neurotransmitter-gated ion channels in the mammalian central nervous system. Maintenance of GABAA receptor protein homeostasis (proteostasis) in cells utilizing its interacting proteins is essential for the function of GABAA receptors. However, how the proteostasis network orchestrates GABAA receptor biogenesis in the endoplasmic reticulum is not well understood. Here, we employed a proteomics-based approach to systematically identify the interactomes of GABAA receptors. We carried out a quantitative immunoprecipitation-tandem mass spectrometry analysis utilizing stable isotope labeling by amino acids in cell culture. Furthermore, we performed comparative proteomics by using both WT α1 subunit and a misfolding-prone α1 subunit carrying the A322D variant as the bait proteins. We identified 125 interactors for WT α1-containing receptors, 105 proteins for α1(A322D)-containing receptors, and 54 overlapping proteins within these two interactomes. Our bioinformatics analysis identified potential GABAA receptor proteostasis network components, including chaperones, folding enzymes, trafficking factors, and degradation factors, and we assembled a model of their potential involvement in the cellular folding, degradation, and trafficking pathways for GABAA receptors. In addition, we verified endogenous interactions between α1 subunits and selected interactors by using coimmunoprecipitation in mouse brain homogenates. Moreover, we showed that TRIM21 (tripartite motif containing-21), an E3 ubiquitin ligase, positively regulated the degradation of misfolding-prone α1(A322D) subunits selectively. This study paves the way for understanding the molecular mechanisms as well as fine-tuning of GABAA receptor proteostasis to ameliorate related neurological diseases such as epilepsy.
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Affiliation(s)
- Ya-Juan Wang
- Department of Physiology and Biophysics, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA; Center for Proteomics and Bioinformatics, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.
| | - Xiao-Jing Di
- Department of Physiology and Biophysics, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
| | - Ting-Wei Mu
- Department of Physiology and Biophysics, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA.
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19
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Caillet C, Stofberg ML, Muleya V, Shonhai A, Zininga T. Host cell stress response as a predictor of COVID-19 infectivity and disease progression. Front Mol Biosci 2022; 9:938099. [PMID: 36032680 PMCID: PMC9411049 DOI: 10.3389/fmolb.2022.938099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Accepted: 07/15/2022] [Indexed: 11/13/2022] Open
Abstract
The coronavirus disease (COVID-19) caused by a coronavirus identified in December 2019 has caused a global pandemic. COVID-19 was declared a pandemic in March 2020 and has led to more than 6.3 million deaths. The pandemic has disrupted world travel, economies, and lifestyles worldwide. Although vaccination has been an effective tool to reduce the severity and spread of the disease there is a need for more concerted approaches to fighting the disease. COVID-19 is characterised as a severe acute respiratory syndrome . The severity of the disease is associated with a battery of comorbidities such as cardiovascular diseases, cancer, chronic lung disease, and renal disease. These underlying diseases are associated with general cellular stress. Thus, COVID-19 exacerbates outcomes of the underlying conditions. Consequently, coronavirus infection and the various underlying conditions converge to present a combined strain on the cellular response. While the host response to the stress is primarily intended to be of benefit, the outcomes are occasionally unpredictable because the cellular stress response is a function of complex factors. This review discusses the role of the host stress response as a convergent point for COVID-19 and several non-communicable diseases. We further discuss the merits of targeting the host stress response to manage the clinical outcomes of COVID-19.
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Affiliation(s)
- Celine Caillet
- Department of Biochemistry, Stellenbosch University, Stellenbosch, South Africa
| | | | - Victor Muleya
- Department of Biochemistry, Midlands State University, Gweru, Zimbabwe
| | - Addmore Shonhai
- Department of Biochemistry and Microbiology, University of Venda, Thohoyandou, South Africa
| | - Tawanda Zininga
- Department of Biochemistry, Stellenbosch University, Stellenbosch, South Africa
- *Correspondence: Tawanda Zininga,
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20
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Lu Q, Gong Y, Xi L, Liu Y, Xu W, Liu H, Jin J, Zhang Z, Yang Y, Zhu X, Xie S, Han D. Feed Restriction Alleviates Chronic Thermal Stress-Induced Liver Oxidation and Damages via Reducing Lipid Accumulation in Channel Catfish (Ictalurus punctatus). Antioxidants (Basel) 2022; 11:antiox11050980. [PMID: 35624844 PMCID: PMC9138062 DOI: 10.3390/antiox11050980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 05/13/2022] [Accepted: 05/15/2022] [Indexed: 02/05/2023] Open
Abstract
Caloric restriction is known to suppress oxidative stress in organ systems. However, whether caloric/feed restriction alleviates chronic thermal stress in aquatic animals remains unknown. Here, we set up three feeding rations: 3% BW (3% body weight/day), 2.5% BW (restricted feeding, 2.5% body weight/day) and 2% BW (high restricted feeding, 2% body weight/day), to investigate the effects and mechanism of feed restriction on improving chronic heat-induced (27 to 31 °C) liver peroxidation and damages in channel catfish (Ictalurus punctatus). The results showed that, compared to 3% BW, both 2.5% BW and 2% BW significantly reduced the liver expressions of hsc70, hsp70 and hsp90, but only 2.5% BW did not reduce the growth performance of channel catfish. The 2.5% BW and 2% BW also reduced the lipid deposition (TG) and improved the antioxidant capacity (CAT, SOD, GSH and T-AOC) in the liver of channel catfish. The heat-induced stress response (plasma glucose, cortisol and NO) and peroxidation (ROS and MDA) were also suppressed by either 2.5% BW or 2% BW. Moreover, 2.5% BW or 2% BW overtly alleviated liver inflammation and damages by reducing endoplasmic reticulum (ER) stress (BIP and Calnexin) and cell apoptosis (BAX, Caspase 3 and Caspase 9) in the liver of channel catfish. In conclusion, 2.5% body weight/day is recommended to improve the antioxidant capacity and liver health of channel catfish during the summer season, as it alleviates liver peroxidation and damages via suppressing lipid accumulation under chronic thermal stress.
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Affiliation(s)
- Qisheng Lu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yulong Gong
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
| | - Longwei Xi
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yulong Liu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenjie Xu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
| | - Haokun Liu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
| | - Junyan Jin
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
| | - Zhimin Zhang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
| | - Yunxia Yang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
| | - Xiaoming Zhu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
| | - Shouqi Xie
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- The Innovative Academy of Seed Design, Chinese Academy of Sciences, Wuhan 430072, China
| | - Dong Han
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; (Q.L.); (Y.G.); (L.X.); (Y.L.); (W.X.); (H.L.); (J.J.); (Z.Z.); (Y.Y.); (X.Z.); (S.X.)
- College of Advanced Agricultural Sciences, University of Chinese Academy of Sciences, Beijing 100049, China
- Hubei Engineering Research Center for Aquatic Animal Nutrition and Feed, Wuhan 430072, China
- Correspondence:
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21
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Mapping SP-C co-chaperone binding sites reveals molecular consequences of disease-causing mutations on protein maturation. Nat Commun 2022; 13:1821. [PMID: 35383173 PMCID: PMC8983781 DOI: 10.1038/s41467-022-29478-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Accepted: 03/11/2022] [Indexed: 01/16/2023] Open
Abstract
BiP co-chaperones ERdj4, ERdj5, and GRP170 associate in cells with peptides predicted to be aggregation prone. Here, extending these findings to a full-length protein, we examine two Interstitial Lung Disease-associated mutants (ILD) of surfactant protein C (SP-C). The TANGO algorithm, which identifies sequences prone to formation of β strand aggregates, found three such regions in SP-C: the N-terminal transmembrane (TM) domain and two sites in the intermolecular chaperone BRICHOS domain. We show the ILD mutants disrupt di-sulfide bond formation in the BRICHOS domain and expose the aggregation-prone peptides leading to binding of ERdj4, ERdj5, and GRP170. The destabilized mutant BRICHOS domain fails to properly insert its TM region in the ER membrane, exposing part of the N-terminal TM domain site. Our studies with ILD-associated mutant proteins provide insights into the specificity of ERdj4, ERdj5, and GRP170, identify context-dependent differences in their binding, and reveal molecular consequences of disease-associated mutants on folding. Interstitial Lung Disease (ILD)-associated mutations in surfactant protein C (SP-C) render the protein prone to aggregation. Here, the authors reveal their impact on protein maturation, provide insights into recognition of aggregation prone regions by chaperones, and address the autosomal dominant nature of ILD mutants.
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22
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Thapsigargin: key to new host-directed coronavirus antivirals? Trends Pharmacol Sci 2022; 43:557-568. [PMID: 35534355 PMCID: PMC9013669 DOI: 10.1016/j.tips.2022.04.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2022] [Revised: 04/09/2022] [Accepted: 04/12/2022] [Indexed: 11/20/2022]
Abstract
Despite the great success of vaccines that protect against RNA virus infections, and the development and clinical use of a limited number of RNA virus-specific drugs, there is still an urgent need for new classes of antiviral drugs against circulating or emerging RNA viruses. To date, it has proved difficult to efficiently suppress RNA virus replication by targeting host cell functions, and there are no approved drugs of this type. This opinion article discusses the recent discovery of a pronounced and sustained antiviral activity of the plant-derived natural compound thapsigargin against enveloped RNA viruses such as severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), Middle East respiratory syndrome coronavirus (MERS-CoV), and influenza A virus. Based on its mechanisms of action, thapsigargin represents a new prototype of compounds with multimodal host-directed antiviral activity.
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23
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Lee SY, Wong PF, Jamal J, Roebuck MM. Naturally-derived endoplasmic reticulum stress inhibitors for osteoarthritis? Eur J Pharmacol 2022; 922:174903. [DOI: 10.1016/j.ejphar.2022.174903] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2021] [Revised: 02/22/2022] [Accepted: 03/17/2022] [Indexed: 01/15/2023]
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Wei B, Zhu Y, Yang P, Han Y, Wang S, Wang X, Xia S, Song X, Zhang Z, Wang S, Rondard P, Pin JP, Jiang X, Liu J. GABA B1e promotes the malignancy of human cancer cells by targeting the tyrosine phosphatase PTPN12. iScience 2021; 24:103311. [PMID: 34778730 PMCID: PMC8577127 DOI: 10.1016/j.isci.2021.103311] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 09/24/2021] [Accepted: 10/14/2021] [Indexed: 01/30/2023] Open
Abstract
Neurotransmitter receptors are involved in cancer progression. Among them, the heterodimeric GABAB receptor, activated by the main inhibitory neurotransmitter GABA, is composed of the transmembrane GABAB1 and GABAB2 subunits. The oncogenic role of the isoform GABAB1e (GB1e) containing only the extracellular domain of GABAB1 remains unclear. We revealed that GB1e is largely expressed in human breast cancer (BrCa) cell lines as well as in BrCa tissues where it is upregulated. Moreover, GB1e promoted the malignancy of BrCa cells both in vitro and in vivo. We propose that GB1e favors EGFR signaling by interacting with PTPN12 to disrupt the interaction between EGFR and PTPN12, and phosphorylation of Y230 and Y404 on GB1e is required in this process. Our data highlight that the GABBR1 gene through the expression of the GB1e isoform might play an important oncogenic role in BrCa and that GB1e is of interest for the treatment of some cancers. GABAB1e promotes the malignancy of breast cancer cells both in vitro and in vivo Specific phosphorylation of GABAB1e is critical for its association with PTPN12 GABAB1e disrupts EGFR interacting with PTPN12 and induces EGFR-PI3K/Akt signaling
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Affiliation(s)
- Bo Wei
- Key Laboratory of Molecular Biophysics of MOE, International Research Center for Sensory Biology and Technology of MOST, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
| | - Yini Zhu
- Key Laboratory of Molecular Biophysics of MOE, International Research Center for Sensory Biology and Technology of MOST, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
| | - Peng Yang
- Department of Breast & Endocrine Surgery, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology (HUST), Wuhan 430022, China
| | - Yong Han
- Department of Pharmacy, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology (HUST), Wuhan 430022, China
| | - Suyun Wang
- Key Laboratory of Molecular Biophysics of MOE, International Research Center for Sensory Biology and Technology of MOST, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
| | - Xiaomei Wang
- Key Laboratory of Molecular Biophysics of MOE, International Research Center for Sensory Biology and Technology of MOST, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
| | - Shuai Xia
- Key Laboratory of Molecular Biophysics of MOE, International Research Center for Sensory Biology and Technology of MOST, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
| | - Xiaoguang Song
- Key Laboratory of Molecular Biophysics of MOE, International Research Center for Sensory Biology and Technology of MOST, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
| | - Zhongling Zhang
- Key Laboratory of Molecular Biophysics of MOE, International Research Center for Sensory Biology and Technology of MOST, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
| | - Sheng Wang
- Key Laboratory of Molecular Biophysics of MOE, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
| | - Philippe Rondard
- Institut de Génomique Fonctionnelle (IGF), Université de Montpellier, CNRS, INSERM, 34094 Montpellier, France
| | - Jean-Philippe Pin
- Institut de Génomique Fonctionnelle (IGF), Université de Montpellier, CNRS, INSERM, 34094 Montpellier, France
| | - Xinnong Jiang
- Key Laboratory of Molecular Biophysics of MOE, International Research Center for Sensory Biology and Technology of MOST, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
- Corresponding author
| | - Jianfeng Liu
- Key Laboratory of Molecular Biophysics of MOE, International Research Center for Sensory Biology and Technology of MOST, College of Life Science and Technology, Huazhong University of Science and Technology (HUST), Wuhan 430074, China
- Corresponding author
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Oh H, Kang MK, Park SH, Kim DY, Kim SI, Oh SY, Na W, Shim JH, Lim SS, Kang YH. Asaronic acid inhibits ER stress sensors and boosts functionality of ubiquitin-proteasomal degradation in 7β-hydroxycholesterol-loaded macrophages. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2021; 92:153763. [PMID: 34601222 DOI: 10.1016/j.phymed.2021.153763] [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: 04/08/2021] [Revised: 09/08/2021] [Accepted: 09/14/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Misfolded proteins are formed in the endoplasmic reticulum (ER) due to diverse stimuli including oxidant production, calcium disturbance, and inflammatory factors. Accumulation of these non-native proteins in the ER evokes cellular stress involving the activation of unfolded protein response (UPR) and the execution of ER-associated degradation (ERAD). Naturally-occurring plant compounds are known to interfere with UPR due to their antioxidant and anti-inflammatory activities, leading to inhibition of ER stress. However, there are few studies dealing with the protective effects of natural compounds on the functionality of ERAD. PURPOSE The current study examined whether asaronic acid enhanced ubiquitin-proteasomal degradation in J774A.1 murine macrophages exposed to 7β-hydroxycholesterol, a risk factor for atherosclerosis. Asaronic acid (2,4,5-trimethoxybenzoic acid), identified as one of purple perilla constituents, has anti-diabetic and anti-inflammatory effects. Little is known regarding the effects of asaronic acid on the ERAD process and the ubiquitin-proteasomal degradation. METHODS AND RESULTS Murine macrophages were incubated with 28 μM 7β-hydroxycholesterol in absence and presence of 1-20 μΜ asaronic acid for up to 24 h. Nontoxic asaronic acid in macrophage diminished the activation of the ER stress sensors of ATF6, IRE1 and PERK stimulated by 7β-hydroxycholesterol. This methoxybenzoic acid down-regulated the oxysterol-induced expression of EDEM1, OS9, Sel1L-Hrd1 and p97/VCP1, all required for the recognition, recruitment and dislocation of misfolded proteins. On the other hand, asaronic acid enhanced the ubiquitin-proteasomal degradation of non-native proteins dislocated to the cytosol by 7β-hydroxycholesterol, which entailed the induction of the chaperones of Hsp70 and CHIP and the increased colocalization of ubiquitin and proteasomes. Taken together, asaronic acid attenuated the induction of the UPR-associated sensors and the dislocation-linked transmembrane components in the ER. Conversely, this compound enhanced the proteasomal degradation of dislocated non-native proteins in concert with the chaperones of Hsp70 and CHIP through ubiquitination. CONCLUSION These observations demonstrate that asaronic acid may be a potent atheroprotective agent as a natural chaperone targeting ER stress-associated macrophage injury.
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Affiliation(s)
- Hyeongjoo Oh
- Department of Food Science and Nutrition and The Korean Institute of Nutrition, Hallym University, Chuncheon, Kangwon-do 24252, Korea
| | - Min-Kyung Kang
- Department of Food Science and Nutrition and The Korean Institute of Nutrition, Hallym University, Chuncheon, Kangwon-do 24252, Korea
| | - Sin-Hye Park
- Department of Food Science and Nutrition and The Korean Institute of Nutrition, Hallym University, Chuncheon, Kangwon-do 24252, Korea
| | - Dong Yeon Kim
- Department of Food Science and Nutrition and The Korean Institute of Nutrition, Hallym University, Chuncheon, Kangwon-do 24252, Korea
| | - Soo-Il Kim
- Department of Food Science and Nutrition and The Korean Institute of Nutrition, Hallym University, Chuncheon, Kangwon-do 24252, Korea
| | - Su Yeon Oh
- Department of Food Science and Nutrition and The Korean Institute of Nutrition, Hallym University, Chuncheon, Kangwon-do 24252, Korea
| | - Woojin Na
- Department of Food Science and Nutrition and The Korean Institute of Nutrition, Hallym University, Chuncheon, Kangwon-do 24252, Korea
| | - Jae-Hoon Shim
- Department of Food Science and Nutrition and The Korean Institute of Nutrition, Hallym University, Chuncheon, Kangwon-do 24252, Korea
| | - Soon Sung Lim
- Department of Food Science and Nutrition and The Korean Institute of Nutrition, Hallym University, Chuncheon, Kangwon-do 24252, Korea
| | - Young-Hee Kang
- Department of Food Science and Nutrition and The Korean Institute of Nutrition, Hallym University, Chuncheon, Kangwon-do 24252, Korea.
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Multi-level inhibition of coronavirus replication by chemical ER stress. Nat Commun 2021; 12:5536. [PMID: 34545074 PMCID: PMC8452654 DOI: 10.1038/s41467-021-25551-1] [Citation(s) in RCA: 50] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Accepted: 08/02/2021] [Indexed: 12/25/2022] Open
Abstract
Coronaviruses (CoVs) are important human pathogens for which no specific treatment is available. Here, we provide evidence that pharmacological reprogramming of ER stress pathways can be exploited to suppress CoV replication. The ER stress inducer thapsigargin efficiently inhibits coronavirus (HCoV-229E, MERS-CoV, SARS-CoV-2) replication in different cell types including primary differentiated human bronchial epithelial cells, (partially) reverses the virus-induced translational shut-down, improves viability of infected cells and counteracts the CoV-mediated downregulation of IRE1α and the ER chaperone BiP. Proteome-wide analyses revealed specific pathways, protein networks and components that likely mediate the thapsigargin-induced antiviral state, including essential (HERPUD1) or novel (UBA6 and ZNF622) factors of ER quality control, and ER-associated protein degradation complexes. Additionally, thapsigargin blocks the CoV-induced selective autophagic flux involving p62/SQSTM1. The data show that thapsigargin hits several central mechanisms required for CoV replication, suggesting that this compound (or derivatives thereof) may be developed into broad-spectrum anti-CoV drugs.
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Qian D, Xiong S, Li M, Tian L, Qing Qu L. OsFes1C, a potential nucleotide exchange factor for OsBiP1, is involved in the ER and salt stress responses. PLANT PHYSIOLOGY 2021; 187:396-408. [PMID: 34618140 PMCID: PMC8418431 DOI: 10.1093/plphys/kiab263] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Accepted: 05/13/2021] [Indexed: 05/25/2023]
Abstract
The endoplasmic reticulum (ER) quality control system monitors protein homeostasis and relies on the activity of many molecular chaperones. Binding immunoglobulin protein (BiP) is a major ER luminal chaperone that is involved in most functions of the organelle. BiP activity is tightly regulated by nucleotide exchange factors (NEFs). However, information about NEFs in plants is limited. We obtained a Fes1-like protein (OsFes1C) through isobaric tags for relative and absolute quantitation-based proteomics analysis of ER-stressed rice (Oryza sativa) seeds. Unlike its homologs in yeast and mammals, which are located in the cytosol and respond to heat stress, OsFes1C is an ER membrane protein and responds to ER and salt stresses. OsFes1C interacts directly with OsBiP1 and the interaction is inhibited by ATP but promoted by ADP, suggesting that OsFes1C acts as a potential NEF of OsBiP1 in vivo. Overexpression or suppression of OsFes1C led to hypersensitivity to ER stress and affected the growth of rice. Furthermore, we established that OsFes1C directly interacts with a putative salt response protein and is involved in the salt response. Taken together, our study marks an important step toward elucidating the functional mechanisms of an identified ER stress response factor in rice.
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Affiliation(s)
- Dandan Qian
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing 100093, China
| | - Shuo Xiong
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing 100093, China
- College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Mei Li
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing 100093, China
- College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Lihong Tian
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing 100093, China
| | - Le Qing Qu
- Key Laboratory of Plant Molecular Physiology, Institute of Botany, Innovation Academy for Seed Design, Chinese Academy of Sciences, Beijing 100093, China
- College of Life Science, University of Chinese Academy of Sciences, Beijing 100049, China
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Cao T, Peng B, Zhou X, Cai J, Tang Y, Luo J, Xie H, Zhang J, Liu S. Integrated signaling system under endoplasmic reticulum stress in eukaryotic microorganisms. Appl Microbiol Biotechnol 2021; 105:4805-4818. [PMID: 34106312 DOI: 10.1007/s00253-021-11380-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 05/18/2021] [Accepted: 05/28/2021] [Indexed: 12/11/2022]
Abstract
The endoplasmic reticulum (ER) is a multifunctional organelle, which is crucial for correct folding and assembly of secretory and transmembrane proteins. Perturbations of ER function can cause ER stress. ER stress can activate the unfolded protein response (UPR) to cope with the accumulation of misfolded proteins and protein toxicity. UPR is a coordination system that regulates transcription and translation, leading to the recovery of ER homeostasis or cell death. However, cells have an integrated signaling system to cope with ER stress, which helps cells to restore and balance their ER function. The main components of this system are ER-associated degradation (ERAD), autophagy, hypoxia signaling, and mitochondrial biogenesis. If the balance cannot be restored, the imbalance will lead to cell death or apoptosis, or even to a series of diseases. In this review, a series of activities to restore the homeostasis of cells during ER stress are discussed. KEY POINTS: • Endoplasmic reticulum (ER) plays a key role in the biological process of cells. • Perturbations of ER function can cause ER stress, including the ER overload response (EOR), sterol-regulated cascade reaction, and the UPR. • Cells have an integrated signaling system (ERAD, autophagy, hypoxia signaling, and mitochondrial biogenesis) to cope with the adverse impact caused by ER stress.
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Affiliation(s)
- Ting Cao
- Department of Clinical Laboratory, The First Affiliated Hospital of University of South China, Hengyang, 421000, Hunan, China
| | - Binfeng Peng
- Department of Clinical Laboratory, The First Affiliated Hospital of University of South China, Hengyang, 421000, Hunan, China
| | - Xiangping Zhou
- Department of Clinical Laboratory, The First Affiliated Hospital of University of South China, Hengyang, 421000, Hunan, China
| | - Jialun Cai
- Department of Clinical Laboratory, The First Affiliated Hospital of University of South China, Hengyang, 421000, Hunan, China
| | - Yun Tang
- Department of Clinical Laboratory, The First Affiliated Hospital of University of South China, Hengyang, 421000, Hunan, China
| | - Jie Luo
- Department of Clinical Laboratory, The First Affiliated Hospital of University of South China, Hengyang, 421000, Hunan, China
| | - Haitao Xie
- Department of Clinical Laboratory, The First Affiliated Hospital of University of South China, Hengyang, 421000, Hunan, China
| | - Ji Zhang
- Department of Clinical Laboratory, The First Affiliated Hospital of University of South China, Hengyang, 421000, Hunan, China
| | - Shuangquan Liu
- Department of Clinical Laboratory, The First Affiliated Hospital of University of South China, Hengyang, 421000, Hunan, China.
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Lemberg MK, Strisovsky K. Maintenance of organellar protein homeostasis by ER-associated degradation and related mechanisms. Mol Cell 2021; 81:2507-2519. [PMID: 34107306 DOI: 10.1016/j.molcel.2021.05.004] [Citation(s) in RCA: 62] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2021] [Revised: 04/14/2021] [Accepted: 05/05/2021] [Indexed: 12/19/2022]
Abstract
Protein homeostasis mechanisms are fundamentally important to match cellular needs and to counteract stress conditions. A fundamental challenge is to understand how defective proteins are recognized and extracted from cellular organelles to be degraded in the cytoplasm. The endoplasmic reticulum (ER)-associated degradation (ERAD) pathway is the best-understood organellar protein quality control system. Here, we review new insights into the mechanism of recognition and retrotranslocation of client proteins in ERAD. In addition to the membrane-integral ERAD E3 ubiquitin ligases, we highlight one protein family that is remarkably often involved in various aspects of membrane protein quality control and protein dislocation: the rhomboid superfamily, which includes derlins and intramembrane serine proteases. Rhomboid-like proteins have been found to control protein homeostasis in the ER, but also in other eukaryotic organelles and in bacteria, pointing toward conserved principles of membrane protein quality control across organelles and evolution.
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Affiliation(s)
- Marius K Lemberg
- Center for Molecular Biology of Heidelberg University (ZMBH), Im Neuenheimer Feld 282, 69120 Heidelberg, Germany; Center for Biochemistry, Medical Faculty, University of Cologne, Joseph-Stelzmann-Strasse 52, 50931 Cologne, Germany.
| | - Kvido Strisovsky
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czechia.
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30
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Autophagy Modulators in Cancer Therapy. Int J Mol Sci 2021; 22:ijms22115804. [PMID: 34071600 PMCID: PMC8199315 DOI: 10.3390/ijms22115804] [Citation(s) in RCA: 39] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Accepted: 05/24/2021] [Indexed: 02/06/2023] Open
Abstract
Autophagy is a process of self-degradation that plays an important role in removing damaged proteins, organelles or cellular fragments from the cell. Under stressful conditions such as hypoxia, nutrient deficiency or chemotherapy, this process can also become the strategy for cell survival. Autophagy can be nonselective or selective in removing specific organelles, ribosomes, and protein aggregates, although the complete mechanisms that regulate aspects of selective autophagy are not fully understood. This review summarizes the most recent research into understanding the different types and mechanisms of autophagy. The relationship between apoptosis and autophagy on the level of molecular regulation of the expression of selected proteins such as p53, Bcl-2/Beclin 1, p62, Atg proteins, and caspases was discussed. Intensive studies have revealed a whole range of novel compounds with an anticancer activity that inhibit or activate regulatory pathways involved in autophagy. We focused on the presentation of compounds strongly affecting the autophagy process, with particular emphasis on those that are undergoing clinical and preclinical cancer research. Moreover, the target points, adverse effects and therapeutic schemes of autophagy inhibitors and activators are presented.
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Abstract
Collagen is the most abundant protein in mammals. A unique feature of collagen is its triple-helical structure formed by the Gly-Xaa-Yaa repeats. Three single chains of procollagen make a trimer, and the triple-helical structure is then folded in the endoplasmic reticulum (ER). This unique structure is essential for collagen's functions in vivo, including imparting bone strength, allowing signal transduction, and forming basement membranes. The triple-helical structure of procollagen is stabilized by posttranslational modifications and intermolecular interactions, but collagen is labile even at normal body temperature. Heat shock protein 47 (Hsp47) is a collagen-specific molecular chaperone residing in the ER that plays a pivotal role in collagen biosynthesis and quality control of procollagen in the ER. Mutations that affect the triple-helical structure or result in loss of Hsp47 activity cause the destabilization of procollagen, which is then degraded by autophagy. In this review, we present the current state of the field regarding quality control of procollagen.
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Affiliation(s)
- Shinya Ito
- Faculty of Life Sciences, Kyoto Sangyo University, Kyoto 603-8555, Japan;
| | - Kazuhiro Nagata
- Faculty of Life Sciences, Kyoto Sangyo University, Kyoto 603-8555, Japan; .,Institute for Protein Dynamics, Kyoto Sangyo University, Kyoto 603-8555, Japan; .,JT Biohistory Research Hall, Osaka, 569-1125, Japan
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32
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Brown AI, Koslover EF. Design principles for the glycoprotein quality control pathway. PLoS Comput Biol 2021; 17:e1008654. [PMID: 33524026 PMCID: PMC7877790 DOI: 10.1371/journal.pcbi.1008654] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Revised: 02/11/2021] [Accepted: 12/21/2020] [Indexed: 01/11/2023] Open
Abstract
Newly-translated glycoproteins in the endoplasmic reticulum (ER) often undergo cycles of chaperone binding and release in order to assist in folding. Quality control is required to distinguish between proteins that have completed native folding, those that have yet to fold, and those that have misfolded. Using quantitative modeling, we explore how the design of the quality-control pathway modulates its efficiency. Our results show that an energy-consuming cyclic quality-control process, similar to the observed physiological system, outperforms alternative designs. The kinetic parameters that optimize the performance of this system drastically change with protein production levels, while remaining relatively insensitive to the protein folding rate. Adjusting only the degradation rate, while fixing other parameters, allows the pathway to adapt across a range of protein production levels, aligning with in vivo measurements that implicate the release of degradation-associated enzymes as a rapid-response system for perturbations in protein homeostasis. The quantitative models developed here elucidate design principles for effective glycoprotein quality control in the ER, improving our mechanistic understanding of a system crucial to maintaining cellular health. We explore the architecture and limitations of the quality-control pathway responsible for efficient folding of secretory proteins. Newly-synthesized proteins are tagged by the attachment of a ‘glycan’ sugar chain which facilitates their binding to a chaperone that assists protein folding. Removal of a specific sugar group on the glycan ends the interaction with the chaperone, and not-yet-folded proteins can be re-tagged for another round of chaperone binding. A degradation pathway acts in parallel with the folding cycle, to remove those proteins that have remained unfolded for a sufficiently long time. We develop and solve a mathematical model of this quality-control system, showing that the cyclical design found in living cells is uniquely able to maximize folded protein throughput while avoiding accumulation of unfolded proteins. Although this physiological model provides the best performance, its parameters must be adjusted to perform optimally under different protein production loads, and any single fixed set of parameters leads to poor performance when production rate is altered. We find that a single adjustable parameter, the protein degradation rate, is sufficient to allow optimal performance across a range of conditions. Interestingly, observations of living cells suggest that the degradation speed is indeed rapidly adjusted.
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Affiliation(s)
- Aidan I. Brown
- Department of Physics, University of California, San Diego, San Diego, California, United States of America
| | - Elena F. Koslover
- Department of Physics, University of California, San Diego, San Diego, California, United States of America
- * E-mail:
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Ferro-Novick S, Reggiori F, Brodsky JL. ER-Phagy, ER Homeostasis, and ER Quality Control: Implications for Disease. Trends Biochem Sci 2021; 46:630-639. [PMID: 33509650 DOI: 10.1016/j.tibs.2020.12.013] [Citation(s) in RCA: 59] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 12/14/2020] [Accepted: 12/22/2020] [Indexed: 12/15/2022]
Abstract
Lysosomal degradation of endoplasmic reticulum (ER) fragments by autophagy, termed ER-phagy or reticulophagy, occurs under normal as well as stress conditions. The recent discovery of multiple ER-phagy receptors has stimulated studies on the roles of ER-phagy. We discuss how the ER-phagy receptors and the cellular components that work with these receptors mediate two important functions: ER homeostasis and ER quality control. We highlight that ER-phagy plays an important role in alleviating ER expansion induced by ER stress, and acts as an alternative disposal pathway for misfolded proteins. We suggest that the latter function explains the emerging connection between ER-phagy and disease. Additional ER-phagy-associated functions and important unanswered questions are also discussed.
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Affiliation(s)
- Susan Ferro-Novick
- Department of Cellular and Molecular Medicine, University of California at San Diego, La Jolla, CA 92093-0668, USA.
| | - Fulvio Reggiori
- Department of Biomedical Sciences of Cells and Systems, University of Groningen, University Medical Center Groningen, The Netherlands.
| | - Jeffrey L Brodsky
- Department of Biological Sciences, University of Pittsburgh, Pittsburgh, PA 15260, USA.
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Potential Physiological Relevance of ERAD to the Biosynthesis of GPI-Anchored Proteins in Yeast. Int J Mol Sci 2021; 22:ijms22031061. [PMID: 33494405 PMCID: PMC7865462 DOI: 10.3390/ijms22031061] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2020] [Revised: 01/18/2021] [Accepted: 01/19/2021] [Indexed: 12/19/2022] Open
Abstract
Misfolded and/or unassembled secretory and membrane proteins in the endoplasmic reticulum (ER) may be retro-translocated into the cytoplasm, where they undergo ER-associated degradation, or ERAD. The mechanisms by which misfolded proteins are recognized and degraded through this pathway have been studied extensively; however, our understanding of the physiological role of ERAD remains limited. This review describes the biosynthesis and quality control of glycosylphosphatidylinositol (GPI)-anchored proteins and briefly summarizes the relevance of ERAD to these processes. While recent studies suggest that ERAD functions as a fail-safe mechanism for the degradation of misfolded GPI-anchored proteins, several pieces of evidence suggest an intimate interaction between ERAD and the biosynthesis of GPI-anchored proteins.
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Abstract
Folding of proteins is essential so that they can exert their functions. For proteins that transit the secretory pathway, folding occurs in the endoplasmic reticulum (ER) and various chaperone systems assist in acquiring their correct folding/subunit formation. N-glycosylation is one of the most conserved posttranslational modification for proteins, and in eukaryotes it occurs in the ER. Consequently, eukaryotic cells have developed various systems that utilize N-glycans to dictate and assist protein folding, or if they consistently fail to fold properly, to destroy proteins for quality control and the maintenance of homeostasis of proteins in the ER.
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36
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Wright MT, Kouba L, Plate L. Thyroglobulin Interactome Profiling Defines Altered Proteostasis Topology Associated With Thyroid Dyshormonogenesis. Mol Cell Proteomics 2020; 20:100008. [PMID: 33581410 PMCID: PMC7950113 DOI: 10.1074/mcp.ra120.002168] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 10/15/2020] [Accepted: 11/18/2020] [Indexed: 12/02/2022] Open
Abstract
Thyroglobulin (Tg) is a secreted iodoglycoprotein serving as the precursor for triiodothyronine and thyroxine hormones. Many characterized Tg gene mutations produce secretion-defective variants resulting in congenital hypothyroidism. Tg processing and secretion is controlled by extensive interactions with chaperone, trafficking, and degradation factors comprising the secretory proteostasis network. While dependencies on individual proteostasis network components are known, the integration of proteostasis pathways mediating Tg protein quality control and the molecular basis of mutant Tg misprocessing remain poorly understood. We employ a multiplexed quantitative affinity purification-mass spectrometry approach to define the Tg proteostasis interactome and changes between WT and several congenital hypothyroidism variants. Mutant Tg processing is associated with common imbalances in proteostasis engagement including increased chaperoning, oxidative folding, and engagement by targeting factors for endoplasmic reticulum-associated degradation. Furthermore, we reveal mutation-specific changes in engagement with N-glycosylation components, suggesting distinct requirements for 1 Tg variant on dual engagement of both oligosaccharyltransferase complex isoforms for degradation. Modulating dysregulated proteostasis components and pathways may serve as a therapeutic strategy to restore Tg secretion and thyroid hormone biosynthesis.
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Affiliation(s)
- Madison T Wright
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee, USA
| | - Logan Kouba
- Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee, USA
| | - Lars Plate
- Department of Chemistry, Vanderbilt University, Nashville, Tennessee, USA; Department of Biological Sciences, Vanderbilt University, Nashville, Tennessee, USA.
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Rellmann Y, Eidhof E, Dreier R. Review: ER stress-induced cell death in osteoarthritic cartilage. Cell Signal 2020; 78:109880. [PMID: 33307190 DOI: 10.1016/j.cellsig.2020.109880] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2020] [Revised: 12/03/2020] [Accepted: 12/04/2020] [Indexed: 12/16/2022]
Abstract
In cartilage, chondrocytes are responsible for the biogenesis and maintenance of the extracellular matrix (ECM) composed of proteins, glycoproteins and proteoglycans. Various cellular stresses, such as hypoxia, nutrient deprivation, oxidative stress or the accumulation of advanced glycation end products (AGEs) during aging, but also translational errors or mutations in cartilage components or chaperone proteins affect the synthesis and secretion of ECM proteins, causing protein aggregates to accumulate in the endoplasmic reticulum (ER). This condition, referred to as ER stress, interferes with cartilage cell homeostasis and initiates the unfolded protein response (UPR), a rescue mechanism to regain cell viability and function. Chronic or irreversible ER stress, however, triggers UPR-initiated cell death. Due to unresolved ER stress in chondrocytes, diseases of the skeletal system, such as chondrodysplasias, arise. ER stress has also been identified as a contributing factor to the pathogenesis of cartilage degeneration processes such as osteoarthritis (OA). This review provides current knowledge about the biogenesis of ECM components in chondrocytes, describes possible causes for the impairment of involved processes and focuses on the ER stress-induced cell death in articular cartilage during OA. Targeting of the ER stress itself or intervention in UPR signaling to reduce death of chondrocytes may be promising for future osteoarthritis therapy.
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Affiliation(s)
- Yvonne Rellmann
- Institute of Physiological Chemistry and Pathobiochemistry, Waldeyerstraße 15, 48149 Münster, Germany
| | - Elco Eidhof
- Institute of Physiological Chemistry and Pathobiochemistry, Waldeyerstraße 15, 48149 Münster, Germany
| | - Rita Dreier
- Institute of Physiological Chemistry and Pathobiochemistry, Waldeyerstraße 15, 48149 Münster, Germany.
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38
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Wright MT, Plate L. Revealing functional insights into ER proteostasis through proteomics and interactomics. Exp Cell Res 2020; 399:112417. [PMID: 33301765 DOI: 10.1016/j.yexcr.2020.112417] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 11/23/2020] [Accepted: 11/28/2020] [Indexed: 12/16/2022]
Abstract
The endoplasmic reticulum (ER), responsible for processing approximately one-third of the human proteome including most secreted and membrane proteins, plays a pivotal role in protein homeostasis (proteostasis). Dysregulation of ER proteostasis has been implicated in a number of disease states. As such, continued efforts are directed at elucidating mechanisms of ER protein quality control which are mediated by transient and dynamic protein-protein interactions with molecular chaperones, co-chaperones, protein folding and trafficking factors that take place in and around the ER. Technological advances in mass spectrometry have played a pivotal role in characterizing and understanding these protein-protein interactions that dictate protein quality control mechanisms. Here, we highlight the recent progress from mass spectrometry-based investigation of ER protein quality control in revealing the topological arrangement of the proteostasis network, stress response mechanisms that adjust the ER proteostasis capacity, and disease specific changes in proteostasis network engagement. We close by providing a brief outlook on underexplored areas of ER proteostasis where mass spectrometry is a tool uniquely primed to further expand our understanding of the regulation and coordination of protein quality control processes in diverse diseases.
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Affiliation(s)
- Madison T Wright
- Department of Chemistry, Vanderbilt University, Nashville, TN, USA
| | - Lars Plate
- Department of Chemistry, Vanderbilt University, Nashville, TN, USA; Department of Biological Sciences, Vanderbilt University, Nashville, TN, USA.
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39
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Dores-Silva PR, Cauvi DM, Coto ALS, Kiraly VTR, Borges JC, De Maio A. Interaction of HSPA5 (Grp78, BIP) with negatively charged phospholipid membranes via oligomerization involving the N-terminal end domain. Cell Stress Chaperones 2020; 25:979-991. [PMID: 32725381 PMCID: PMC7385938 DOI: 10.1007/s12192-020-01134-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Revised: 06/25/2020] [Accepted: 06/30/2020] [Indexed: 02/07/2023] Open
Abstract
Heat shock proteins (HSPs) are ubiquitous polypeptides expressed in all living organisms that participate in several basic cellular processes, including protein folding, from which their denomination as molecular chaperones originated. There are several HSPs, including HSPA5, also known as 78-kDa glucose-regulated protein (GRP78) or binding immunoglobulin protein (BIP) that is an ER resident involved in the folding of polypeptides during their translocation into this compartment prior to the transition to the Golgi network. HSPA5 is detected on the surface of cells or secreted into the extracellular environment. Surface HSPA5 has been proposed to have various roles, such as receptor-mediated signal transduction, a co-receptor for soluble ligands, as well as a participant in tumor survival, proliferation, and resistance. Recently, surface HSPA5 has been reported to be a potential receptor of some viruses, including the novel SARS-CoV-2. In spite of these observations, the association of HSPA5 within the plasma membrane is still unclear. To gain information about this process, we studied the interaction of HSPA5 with liposomes made of different phospholipids. We found that HSPA5 has a high affinity for negatively charged phospholipids, such as palmitoyl-oleoyl phosphoserine (POPS) and cardiolipin (CL). The N-terminal and C-terminal domains of HSPA5 were independently capable of interacting with negatively charged phospholipids, but to a lesser extent than the full-length protein, suggesting that both domains are required for the maximum insertion into membranes. Interestingly, we found that the interaction of HSPA5 with negatively charged liposomes promotes an oligomerization process via intermolecular disulfide bonds in which the N-terminus end of the protein plays a critical role.
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Affiliation(s)
- Paulo Roberto Dores-Silva
- Division of Trauma, Critical Care, Burns and Acute Care Surgery, Department of Surgery, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA
- São Carlos Institute of Chemistry, University of São Paulo, São Paulo, Brazil
| | - David M Cauvi
- Division of Trauma, Critical Care, Burns and Acute Care Surgery, Department of Surgery, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA
| | - Amanda L S Coto
- São Carlos Institute of Chemistry, University of São Paulo, São Paulo, Brazil
| | - Vanessa T R Kiraly
- São Carlos Institute of Chemistry, University of São Paulo, São Paulo, Brazil
| | - Júlio C Borges
- São Carlos Institute of Chemistry, University of São Paulo, São Paulo, Brazil
| | - Antonio De Maio
- Division of Trauma, Critical Care, Burns and Acute Care Surgery, Department of Surgery, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA.
- Department of Neurosciences, School of Medicine, University of California San Diego, La Jolla, CA, 92093, USA.
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Chiritoiu M, Chiritoiu GN, Munteanu CVA, Pastrama F, Ivessa NE, Petrescu SM. EDEM1 Drives Misfolded Protein Degradation via ERAD and Exploits ER-Phagy as Back-Up Mechanism When ERAD Is Impaired. Int J Mol Sci 2020; 21:ijms21103468. [PMID: 32423001 PMCID: PMC7279049 DOI: 10.3390/ijms21103468] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2020] [Revised: 04/30/2020] [Accepted: 05/07/2020] [Indexed: 01/20/2023] Open
Abstract
Endoplasmic reticulum (ER)-associated degradation (ERAD) is the main mechanism of targeting ER proteins for degradation to maintain homeostasis, and perturbations of ERAD lead to pathological conditions. ER-degradation enhancing α-mannosidase-like (EDEM1) was proposed to extract terminally misfolded proteins from the calnexin folding cycle and target them for degradation by ERAD. Here, using mass-spectrometry and biochemical methods, we show that EDEM1 is found in auto-regulatory complexes with ERAD components. Moreover, the N-terminal disordered region of EDEM1 mediates protein–protein interaction with misfolded proteins, whilst the absence of this domain significantly impairs their degradation. We also determined that overexpression of EDEM1 can induce degradation, even when proteasomal activity is severely impaired, by promoting the formation of aggregates, which can be further degraded by autophagy. Therefore, we propose that EDEM1 maintains ER homeostasis and mediates ERAD client degradation via autophagy when either dislocation or proteasomal degradation are impaired.
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Affiliation(s)
- Marioara Chiritoiu
- Department of Molecular Cell Biology, Institute of Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (M.C.); (G.N.C.)
| | - Gabriela N. Chiritoiu
- Department of Molecular Cell Biology, Institute of Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (M.C.); (G.N.C.)
| | - Cristian V. A. Munteanu
- Department of Bioinformatics & Structural Biochemistry, Institute of Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (C.V.A.M.); (F.P.)
| | - Florin Pastrama
- Department of Bioinformatics & Structural Biochemistry, Institute of Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (C.V.A.M.); (F.P.)
| | - N. Erwin Ivessa
- Center for Medical Biochemistry, Max Perutz Labs, Medical University of Vienna, A-1030 Vienna, Austria;
| | - Stefana M. Petrescu
- Department of Molecular Cell Biology, Institute of Biochemistry, Splaiul Independentei 296, 060031 Bucharest 17, Romania; (M.C.); (G.N.C.)
- Correspondence: ; Tel.: +40-2-1223-9069
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