1
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Silva NSM, Siebeneichler B, Oliveira CS, Dores-Silva PR, Borges JC. The regulation of the thermal stability and affinity of the HSPA5 (Grp78/BiP) by clients and nucleotides is modulated by domains coupling. BIOCHIMICA ET BIOPHYSICA ACTA. PROTEINS AND PROTEOMICS 2024; 1872:141034. [PMID: 39009203 DOI: 10.1016/j.bbapap.2024.141034] [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: 05/14/2024] [Revised: 07/03/2024] [Accepted: 07/09/2024] [Indexed: 07/17/2024]
Abstract
The HSPA5 protein (BiP/Grp78) serves as a pivotal chaperone in maintaining cellular protein quality control. As a member of the human HSP70 family, HSPA5 comprises two distinct domains: a nucleotide-binding domain (NBD) and a peptide-binding domain (PBD). In this study, we investigated the interdomain interactions of HSPA5, aiming to elucidate how these domains regulate its function as a chaperone. Our findings revealed that HSPA5-FL, HSPA5-T, and HSPA5-N exhibit varying affinities for ATP and ADP, with a noticeable dependency on Mg2+ for optimal interactions. Interestingly, in ADP assays, the presence of the metal ion seems to enhance NBD binding only for HSPA5-FL and HSPA5-T. Moreover, while the truncation of the C-terminus does not significantly impact the thermal stability of HSPA5, experiments involving MgATP underscore its essential role in mediating interactions and nucleotide hydrolysis. Thermal stability assays further suggested that the NBD-PBD interface enhances the stability of the NBD, more pronounced for HSPA5 than for the orthologous HSPA1A, and prevents self-aggregation through interdomain coupling. Enzymatic analyses indicated that the presence of PBD enhances NBD ATPase activity and augments its nucleotide affinity. Notably, the intrinsic chaperone activity of the PBD is dependent on the presence of the NBD, potentially due to the propensity of the PBD for self-oligomerization. Collectively, our data highlight the pivotal role of allosteric mechanisms in modulating thermal stability, nucleotide interaction, and ATPase activity of HSPA5, underscoring its significance in protein quality control within cellular environments.
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Affiliation(s)
- Noeli S M Silva
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP, Brazil.
| | - Bruna Siebeneichler
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP, Brazil; Exact and Technology Sciences Center, Federal University of São Carlos, São Carlos, SP 13560-970, Brazil
| | - Carlos S Oliveira
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP, Brazil
| | - Paulo R Dores-Silva
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP, Brazil
| | - Júlio C Borges
- São Carlos Institute of Chemistry, University of São Paulo, São Carlos, SP, Brazil.
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2
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Wang J, Zhang J, Guo Z, Hua H, Zhang H, Liu Y, Jiang Y. Targeting HSP70 chaperones by rhein sensitizes liver cancer to artemisinin derivatives. PHYTOMEDICINE : INTERNATIONAL JOURNAL OF PHYTOTHERAPY AND PHYTOPHARMACOLOGY 2024; 122:155156. [PMID: 37897861 DOI: 10.1016/j.phymed.2023.155156] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 09/15/2023] [Accepted: 10/17/2023] [Indexed: 10/30/2023]
Abstract
BACKGROUND Liver cancer is one of common types of cancer with poor prognosis and limited therapies. Heat shock proteins (HSP) are molecular chaperones that have important roles in tumorigenesis, and emerging as therapeutic targets. Artemisinin and rhein are natural agents from Artemisia annua L. and Rheum undulatum L., respectively. Both rhein and artemisinin have anticancer effects; however, the molecular targets of rhein remain to be identified. It is also unclear whether rhein can synergize with artemisinin derivatives to inhibit liver cancer. PURPOSE We aim to identify the targets of rhein in the treatment of hepatocarcinoma and determine the effects of combining rhein and artemisinin derivatives on liver cancer cells. METHODS The targets of rhein were detected by mass spectrometry and validated by rhein-proteins interaction assays. The effects of rhein on the chaperone activity of HSP72/HSC70/GRP78 were determined by luciferase refolding assays. Cell viability and apoptosis were determined by CCK8 and flow cytometry assays. For in vivo study, xenograft tumor models were established and treated with rhein and artesunate. Tumor growth was monitored regularly. RESULTS Mass spectrometry analysis of rhein-binding proteins in HepG2 cells revealed that HSP72, HSC70 and GRP78 were more profoundly pulled down by rhein-crosslinked sepharose 4B beads compared to the control beads. Further experiments demonstrated that rhein directly interacted with HSP72/HSC70/GRP78 proteins, and inhibit their activity of refolding denatured luciferase. Meanwhile, rhein induced proteasomal degradation of HIF1α and β-catenin. Artesunate or dihydroartemisinin in combination with knockdown of both HSP72 and HSC70 significantly inhibited cell viability. The HSP70/HSC70/GRP78 inhibitors VER-155,008 and rhein phenocopied HSP72/HSC70 knockdown, synergizing with artesunate or dihydroartemisinin to inhibit hepatocarcinoma cell viability. Combinatorial treatment with rhein and artemisinin derivatives significantly induced hepatocarcinoma cell apoptosis, and inhibited tumor growth in vivo. CONCLUSIONS The current study demonstrates that rhein is a novel HSP72/HSC70/GRP78 inhibitor that suppresses the chaperone activity of HSP70s. Dual inhibition of HSP72 and HSC70 can enhance the sensitivity of hepatocarcinoma cells to artemisinin derivatives. Combined treatment with artemisinin derivative and rhein significantly inhibits hepatocarcinoma. Artemisinin derivatives in combination with dual inhibition of HSP72 and HSC70 represents a new approach to improve cancer therapy.
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Affiliation(s)
- Jiao Wang
- Cancer center, Laboratory of Oncogene, West China Hospital, Sichuan University, China; School of Basic Medicine, Chengdu University of Traditional Chinese Medicine, China
| | - Jin Zhang
- Cancer center, Laboratory of Oncogene, West China Hospital, Sichuan University, China
| | - Zeyu Guo
- Cancer center, Laboratory of Oncogene, West China Hospital, Sichuan University, China
| | - Hui Hua
- Laboratory of Stem Cell Biology, West China Hospital, Sichuan University, China
| | - Hongying Zhang
- Cancer center, Laboratory of Oncogene, West China Hospital, Sichuan University, China
| | - Yongliang Liu
- Cancer center, Laboratory of Oncogene, West China Hospital, Sichuan University, China
| | - Yangfu Jiang
- Cancer center, Laboratory of Oncogene, West China Hospital, Sichuan University, China.
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3
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Diogo-Jr R, de Resende Von Pinho EV, Pinto RT, Zhang L, Condori-Apfata JA, Pereira PA, Vilela DR. Maize heat shock proteins-prospection, validation, categorization and in silico analysis of the different ZmHSP families. STRESS BIOLOGY 2023; 3:37. [PMID: 37981586 PMCID: PMC10482818 DOI: 10.1007/s44154-023-00104-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2023] [Accepted: 07/05/2023] [Indexed: 11/21/2023]
Abstract
Among the plant molecular mechanisms capable of effectively mitigating the effects of adverse weather conditions, the heat shock proteins (HSPs), a group of chaperones with multiple functions, stand out. At a time of full progress on the omic sciences, they look very promising in the genetic engineering field, especially in order to conceive superior genotypes, potentially tolerant to abiotic stresses (AbSts). Recently, some works concerning certain families of maize HSPs (ZmHSPs) were published. However, there was still a lack of a study that, with a high degree of criteria, would fully conglomerate them. Using distinct but complementary strategies, we have prospected as many ZmHSPs candidates as possible, gathering more than a thousand accessions. After detailed data mining, we accounted for 182 validated ones, belonging to seven families, which were subcategorized into classes with potential for functional parity. In them, we identified dozens of motifs with some degree of similarity with proteins from different kingdoms, which may help explain some of their still poorly understood means of action. Through in silico and in vitro approaches, we compared their expression levels after controlled exposure to several AbSts' sources, applied at diverse tissues, on varied phenological stages. Based on gene ontology concepts, we still analyzed them from different perspectives of term enrichment. We have also searched, in model plants and close species, for potentially orthologous genes. With all these new insights, which culminated in a plentiful supplementary material, rich in tables, we aim to constitute a fertile consultation source for those maize researchers attracted by these interesting stress proteins.
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Affiliation(s)
- Rubens Diogo-Jr
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, (47907), USA.
- Department of Agriculture, Federal University of Lavras (UFLA), Lavras, MG, (37200-900), Brazil.
| | | | - Renan Terassi Pinto
- Faculty of Philosophy and Sciences at Ribeirao Preto, University of Sao Paulo (USP), Ribeirao Preto, SP, (14040-901), Brazil
| | - Lingrui Zhang
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, (47907), USA
| | - Jorge Alberto Condori-Apfata
- Department of Horticulture and Landscape Architecture, Purdue University, West Lafayette, IN, (47907), USA
- Faculty of Engineering and Agricultural Sciences, Universidad Nacional Toribio Rodriguez de Mendoza de Amazonas (UNTRM), Chachapoyas, AM, (01001), Peru
| | - Paula Andrade Pereira
- Department of Agriculture, Federal University of Lavras (UFLA), Lavras, MG, (37200-900), Brazil
| | - Danielle Rezende Vilela
- Department of Agriculture, Federal University of Lavras (UFLA), Lavras, MG, (37200-900), Brazil
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4
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Schneider M, Antes I. Comparison of allosteric signaling in DnaK and BiP using mutual information between simulated residue conformations. Proteins 2023; 91:237-255. [PMID: 36111439 DOI: 10.1002/prot.26425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2022] [Revised: 08/06/2022] [Accepted: 09/13/2022] [Indexed: 01/13/2023]
Abstract
The heat shock protein 70 kDa (Hsp70) chaperone system serves as a critical component of protein quality control across a wide range of prokaryotic and eukaryotic organisms. Divergent evolution and specialization to particular organelles have produced numerous Hsp70 variants which share similarities in structure and general function, but differ substantially in regulatory aspects, including conformational dynamics and activity modulation by cochaperones. The human Hsp70 variant BiP (also known as GRP78 or HSPA5) is of therapeutic interest in the context of cancer, neurodegenerative diseases, and viral infection, including for treatment of the pandemic virus SARS-CoV-2. Due to the complex conformational rearrangements and high sequential variance within the Hsp70 protein family, it is in many cases poorly understood which amino acid mutations are responsible for biochemical differences between protein variants. In this study, we predicted residues associated with conformational regulation of human BiP and Escherichia coli DnaK. Based on protein structure networks obtained from molecular dynamics simulations, we analyzed the shared information between interaction timelines to highlight residue positions with strong conformational coupling to their environment. Our predictions, which focus on the binding processes of the chaperone's substrate and cochaperones, indicate residues filling potential signaling roles specific to either DnaK or BiP. By combining predictions of individual residues into conformationally coupled chains connecting ligand binding sites, we predict a BiP specific secondary signaling pathway associated with substrate binding. Our study sheds light on mechanistic differences in signaling and regulation between Hsp70 variants, which provide insights relevant to therapeutic applications of these proteins.
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Affiliation(s)
- Markus Schneider
- TUM Center for Functional Protein Assemblies and TUM School of Life Sciences, Technische Universität München, Freising, Bavaria, Germany
| | - Iris Antes
- TUM Center for Functional Protein Assemblies and TUM School of Life Sciences, Technische Universität München, Freising, Bavaria, Germany
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5
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Marzano NR, Paudel BP, van Oijen AM, Ecroyd H. Real-time single-molecule observation of chaperone-assisted protein folding. SCIENCE ADVANCES 2022; 8:eadd0922. [PMID: 36516244 PMCID: PMC9750156 DOI: 10.1126/sciadv.add0922] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Accepted: 11/10/2022] [Indexed: 06/17/2023]
Abstract
The ability of heat shock protein 70 (Hsp70) molecular chaperones to remodel the conformation of their clients is central to their biological function; however, questions remain regarding the precise molecular mechanisms by which Hsp70 machinery interacts with the client and how this contributes toward efficient protein folding. Here, we used total internal reflection fluorescence (TIRF) microscopy and single-molecule fluorescence resonance energy transfer (smFRET) to temporally observe the conformational changes that occur to individual firefly luciferase proteins as they are folded by the bacterial Hsp70 system. We observed multiple cycles of chaperone binding and release to an individual client during refolding and determined that high rates of chaperone cycling improves refolding yield. Furthermore, we demonstrate that DnaJ remodels misfolded proteins via a conformational selection mechanism, whereas DnaK resolves misfolded states via mechanical unfolding. This study illustrates that the temporal observation of chaperone-assisted folding enables the elucidation of key mechanistic details inaccessible using other approaches.
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Affiliation(s)
- Nicholas R. Marzano
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health and Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Bishnu P. Paudel
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health and Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Antoine M. van Oijen
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health and Medical Research Institute, Wollongong, New South Wales 2522, Australia
| | - Heath Ecroyd
- Molecular Horizons and School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
- Illawarra Health and Medical Research Institute, Wollongong, New South Wales 2522, Australia
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6
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Walter RM, Zemella A, Schramm M, Kiebist J, Kubick S. Vesicle-based cell-free synthesis of short and long unspecific peroxygenases. Front Bioeng Biotechnol 2022; 10:964396. [PMID: 36394036 PMCID: PMC9663805 DOI: 10.3389/fbioe.2022.964396] [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: 06/08/2022] [Accepted: 09/23/2022] [Indexed: 11/07/2022] Open
Abstract
Unspecific peroxygenases (UPOs, EC 1.11.2.1) are fungal enzymes that catalyze the oxyfunctionalization of non-activated hydrocarbons, making them valuable biocatalysts. Despite the increasing interest in UPOs that has led to the identification of thousands of putative UPO genes, only a few of these have been successfully expressed and characterized. There is currently no universal expression system in place to explore their full potential. Cell-free protein synthesis has proven to be a sophisticated technique for the synthesis of difficult-to-express proteins. In this work, we aimed to establish an insect-based cell-free protein synthesis (CFPS) platform to produce UPOs. CFPS relies on translationally active cell lysates rather than living cells. The system parameters can thus be directly manipulated without having to account for cell viability, thereby making it highly adaptable. The insect-based lysate contains translocationally active, ER-derived vesicles, called microsomes. These microsomes have been shown to allow efficient translocation of proteins into their lumen, promoting post-translational modifications such as disulfide bridge formation and N-glycosylations. In this study the ability of a redox optimized, vesicle-based, eukaryotic CFPS system to synthesize functional UPOs was explored. The influence of different reaction parameters as well as the influence of translocation on enzyme activity was evaluated for a short UPO from Marasmius rotula and a long UPO from Agrocybe aegerita. The capability of the CFPS system described here was demonstrated by the successful synthesis of a novel UPO from Podospora anserina, thus qualifying CFPS as a promising tool for the identification and evaluation of novel UPOs and variants thereof.
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Affiliation(s)
- Ruben Magnus Walter
- Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalytics and Bioprocesses (IZI-BB), Potsdam, Germany
| | - Anne Zemella
- Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalytics and Bioprocesses (IZI-BB), Potsdam, Germany
| | - Marina Schramm
- Institute of Biotechnology, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany
| | - Jan Kiebist
- Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalytics and Bioprocesses (IZI-BB), Potsdam, Germany
- Institute of Biotechnology, Brandenburg University of Technology Cottbus-Senftenberg, Senftenberg, Germany
| | - Stefan Kubick
- Fraunhofer Institute for Cell Therapy and Immunology (IZI), Branch Bioanalytics and Bioprocesses (IZI-BB), Potsdam, Germany
- Freie Universität Berlin, Institute of Chemistry and Biochemistry – Biochemistry, Berlin, Germany
- Faculty of Health Sciences, Joint Faculty of the Brandenburg University of Technology Cottbus – Senftenberg, The Brandenburg Medical School Theodor Fontane, University of Potsdam, Potsdam, Germany
- *Correspondence: Stefan Kubick,
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7
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Amankwah YS, Collins P, Fleifil Y, Unruh E, Ruiz Márquez KJ, Vitou K, Kravats AN. Grp94 works upstream of BiP in protein remodeling under heat stress. J Mol Biol 2022; 434:167762. [PMID: 35905823 DOI: 10.1016/j.jmb.2022.167762] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2022] [Revised: 06/28/2022] [Accepted: 07/21/2022] [Indexed: 10/16/2022]
Abstract
Hsp90 and Hsp70 are highly conserved molecular chaperones that promote the proper folding and activation of substrate proteins that are often referred to as clients. The two chaperones functionally collaborate to fold specific clients in an ATP-dependent manner. In eukaryotic cytosol, initial client folding is done by Hsp70 and its co-chaperones, followed by a direct transfer of client refolding intermediates to Hsp90 for final client processing. However, the mechanistic details of collaboration of organelle specific Hsp70 and Hsp90 are lacking. This work investigates the collaboration of the endoplasmic reticulum (ER) Hsp70 and Hsp90, BiP and Grp94 respectively, in protein remodeling using in vitro refolding assays. We show that under milder denaturation conditions, BiP collaborates with its co-chaperones to refold misfolded proteins in an ATP-dependent manner. Grp94 does not play a major role in this refolding reaction. However, under stronger denaturation conditions that favor aggregation, Grp94 works in an ATP-independent manner to bind and hold misfolded clients in a folding competent state for subsequent remodeling by the BiP system. We also show that the collaboration of Grp94 and BiP is not simply a reversal of the eukaryotic refolding mechanism since a direct interaction of Grp94 and BiP is not required for client transfer. Instead, ATP binding but not hydrolysis by Grp94 facilitates the release of the bound client, which is then picked up by the BiP system for subsequent refolding in a Grp94-independent manner.
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Affiliation(s)
- Yaa S Amankwah
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056
| | - Preston Collins
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056
| | - Yasmeen Fleifil
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056
| | - Erin Unruh
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056
| | | | - Katherine Vitou
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056
| | - Andrea N Kravats
- Department of Chemistry and Biochemistry, Miami University, Oxford, OH 45056.
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8
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Ocansey S, Pullen D, Atkinson P, Clarke A, Hadonou M, Crosby C, Short J, Lloyd IC, Smedley D, Assunta A, Shah P, McEntagart M. Biallelic DNAJC3 variants in a neuroendocrine developmental disorder with insulin dysregulation. Clin Dysmorphol 2022; 31:11-17. [PMID: 34654017 DOI: 10.1097/mcd.0000000000000397] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
DNAJC3, a co-chaperone of BiP, is a member of the heat shock protein family. These proteins are produced in the endoplasmic reticulum (ER) to counter cell stress resulting from healthy functional protein processing. Dysregulation of unfolded proteins within the ER is implicated as a mechanism of genetic disease. Examples include Marinesco-Sjogren and Wolcott-Rallison syndromes that share similar clinical features, manifesting neurodegenerative disease and endocrine dysfunction. Recently, loss of function mutations in DNAJC3 was associated with syndromic diabetes mellitus in three families. The full phenotype included neurodegeneration, ataxia, deafness, neuropathy, adolescent-onset diabetes mellitus, growth hormone deficiency and hypothyroidism. A subsequent report of two unrelated individuals extended the phenotype to include early-onset hyperinsulinaemic hypoglycaemia. Here, we describe two siblings that recapitulate this extended phenotype in association with a homozygous novel mutation in the final exon of DNAJC3 [c.1367_1370delAGAA (p.Lys456SerfsTer85)] resulting in protein elongation predicted to abrogate the functional J domain. This report confirms DNAJC3 as a cause of syndromic congenital hyperinsulinaemic hypoglycaemia. Currently, PanelApp only includes this gene on diabetes mellitus panels. We propose DNAJC3 should be promoted from a red to a green gene on a wider number of panels to improve the diagnosis of this rare condition.
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Affiliation(s)
- Sharon Ocansey
- Medical Genetics, St George's University Hospitals NHS FT
| | - Debbie Pullen
- Department of Paediatrics, Surrey and Sussex Healthcare NHS Trust
| | | | - Antonia Clarke
- Department of Paediatric Neurology, St George's University Hospitals NHS FT
| | - Medard Hadonou
- St George's Genomics Service, St George's University Hospitals NHS FT
| | - Charlene Crosby
- St George's Genomics Service, St George's University Hospitals NHS FT
| | - John Short
- St George's Genomics Service, St George's University Hospitals NHS FT
| | | | | | - Albanese Assunta
- Department of Paediatric Endocrinology, St George's University Hospitals NHS FT
| | - Pratik Shah
- Current affiliation: Department of Paediatric Endocrinology and Diabetes, The Royal London Hospital for Children, Barts Health NHS Trust, London, UK
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9
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Jahangirizadeh Z, Ghafouri H, Sajedi RH, Sariri R, Hossienkhani S. Rapid and simple screening of the apoptotic compounds based on Hsp70 inhibition using luciferase as an intracellular reporter. Anal Bioanal Chem 2020; 412:149-158. [PMID: 31897564 DOI: 10.1007/s00216-019-02220-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Revised: 09/08/2019] [Accepted: 10/16/2019] [Indexed: 11/26/2022]
Abstract
HSP70 is a powerful antiapoptotic protein that can block the extrinsic and intrinsic pathways of apoptosis. The present study describes a rapid, sensitive, and inexpensive system using luciferase as a reporter for the functional analysis of apoptotic compounds. For this approach, the co-transformation of Escherichia coli cells was performed with two expression vectors containing Hsp70 and firefly luciferase. It was found that the luciferase inactivated by heat treatment (40-46 °C for 10 min) was approximately reactivated at room temperature and regained 70% of its initial activity before heat inactivation after 60 min. The results show that the reactivation of thermally inactivated luciferase was inhibited in living cells by treatment with VER-155008 and pifitrin-μ as Hsp70 inhibitors, with half-maximal inhibitory concentration of 124 and 384 μM, respectively. The sensitivity of this method for detecting VER-155008 and pifitrin-μ was about 8 and 25 μM, respectively. Also, this reporter system showed no response to doxorubicin and dactinomycin, which bind to DNA, and we used these anticancer compounds as control compounds. Therefore, for the first time, a rapid and simple real-time system using luciferase as a reporter is introduced for the screening of apoptosis-inducing compounds based on suppression of Hsp70 in E. coli cells.
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Affiliation(s)
- Zohreh Jahangirizadeh
- Department of Biology, Faculty of Science, University of Guilan, P.O. Box 41335-1914, Rasht, Iran
| | - Hossein Ghafouri
- Department of Biology, Faculty of Science, University of Guilan, P.O. Box 41335-1914, Rasht, Iran.
| | - Reza H Sajedi
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-154, Tehran, Iran
| | - Reyhaneh Sariri
- Department of Biology, Faculty of Science, University of Guilan, P.O. Box 41335-1914, Rasht, Iran
| | - Saman Hossienkhani
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-154, Tehran, Iran
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10
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Lindstedt P, Aprile FA, Matos MJ, Perni M, Bertoldo JB, Bernardim B, Peter Q, Jiménez-Osés G, Knowles TPJ, Dobson CM, Corzana F, Vendruscolo M, Bernardes GJL. Enhancement of the Anti-Aggregation Activity of a Molecular Chaperone Using a Rationally Designed Post-Translational Modification. ACS CENTRAL SCIENCE 2019; 5:1417-1424. [PMID: 31482124 PMCID: PMC6716132 DOI: 10.1021/acscentsci.9b00467] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Indexed: 06/10/2023]
Abstract
Protein behavior is closely regulated by a plethora of post-translational modifications (PTMs). It is therefore desirable to develop approaches to design rational PTMs to modulate specific protein functions. Here, we report one such method, and we illustrate its successful implementation by potentiating the anti-aggregation activity of a molecular chaperone. Molecular chaperones are a multifaceted class of proteins essential to protein homeostasis, and one of their major functions is to combat protein misfolding and aggregation, a phenomenon linked to a number of human disorders. In this work, we conjugated a small-molecule inhibitor of the aggregation of α-synuclein, a process associated with Parkinson's disease (PD), to a specific cysteine residue on human Hsp70, a molecular chaperone with five free cysteines. We show that this regioselective conjugation augments in vitro the anti-aggregation activity of Hsp70 in a synergistic manner. This Hsp70 variant also displays in vivo an enhanced suppression of α-synuclein aggregation and its associated toxicity in a Caenorhabditis elegans model of PD.
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Affiliation(s)
- Philip
R. Lindstedt
- Centre
for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Francesco A. Aprile
- Centre
for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Maria J. Matos
- Centre
for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Michele Perni
- Centre
for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Jean B. Bertoldo
- Centre
for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Barbara Bernardim
- Centre
for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Quentin Peter
- Centre
for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Gonzalo Jiménez-Osés
- Departamento
de Química, Universidad de La Rioja, Centro de Investigación en Síntesis
Química, 26006 Logroño, Spain
- CIC
bioGUNE, Bizkaia Technology Park, Building 801A, 48170 Derio, Spain
| | - Tuomas P. J. Knowles
- Centre
for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Christopher M. Dobson
- Centre
for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Francisco Corzana
- Departamento
de Química, Universidad de La Rioja, Centro de Investigación en Síntesis
Química, 26006 Logroño, Spain
| | - Michele Vendruscolo
- Centre
for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
| | - Gonçalo J. L. Bernardes
- Centre
for Misfolding Diseases, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
- Instituto
de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Avenida Professor Egas Moniz, 1649-028, Lisboa, Portugal
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11
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Constructive approach for synthesis of a functional IgG using a reconstituted cell-free protein synthesis system. Sci Rep 2019; 9:671. [PMID: 30679500 PMCID: PMC6345822 DOI: 10.1038/s41598-018-36691-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Accepted: 11/22/2018] [Indexed: 11/30/2022] Open
Abstract
IgG is an indispensable biological experimental tool as well as a widely-used therapeutic protein. However, cell culture-based expression of monoclonal IgG is costly and time-consuming, making this process difficult to use for high-throughput screening in early-stage evaluation of biologics. With the goal of establishing a fast, simple, and robust high-throughput expression system for IgG, we implemented the synthesis of functional aglycosylated IgG by constructive approach based on a reconstituted prokaryotic cell-free protein synthesis system (PURE system). Optimization of the PURE system revealed that the following factors and reaction conditions were needed for IgG synthesis: (1) inclusion of the disulfide bond isomerase DsbC, (2) adjustment of the GSH/GSSG ratio, (3) inclusion of the molecular chaperone DnaK and its cofactors, and (4) use of an extended incubation time. Synthesis temperature and template DNA ratio (light chain-/heavy chain-encoding) also had been optimized for each IgG. Under optimal conditions, peak production of the anti-HER2 antibody trastuzumab reached 124 µg/mL. Furthermore, the active forms of other IgGs, including IgG1, IgG2, and IgG4 subclasses, also were synthesized. These results provide basic information for the development of novel high-throughput expression and functional screening systems for IgG, as well as useful information for understanding the IgG synthesis process.
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12
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Pobre KFR, Poet GJ, Hendershot LM. The endoplasmic reticulum (ER) chaperone BiP is a master regulator of ER functions: Getting by with a little help from ERdj friends. J Biol Chem 2018; 294:2098-2108. [PMID: 30563838 DOI: 10.1074/jbc.rev118.002804] [Citation(s) in RCA: 236] [Impact Index Per Article: 39.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The endoplasmic reticulum (ER) represents the entry point into the secretory pathway where nascent proteins encounter a specialized environment for their folding and maturation. Inherent to these processes is a dedicated quality-control system that detects proteins that fail to mature properly and targets them for cytosolic degradation. An imbalance in protein folding and degradation can result in the accumulation of unfolded proteins in the ER, resulting in the activation of a signaling cascade that restores proper homeostasis in this organelle. The ER heat shock protein 70 (Hsp70) family member BiP is an ATP-dependent chaperone that plays a critical role in these processes. BiP interacts with specific ER-localized DnaJ family members (ERdjs), which stimulate BiP's ATP-dependent substrate interactions, with several ERdjs also binding directly to unfolded protein clients. Recent structural and biochemical studies have provided detailed insights into the allosteric regulation of client binding by BiP and have enhanced our understanding of how specific ERdjs enable BiP to perform its many functions in the ER. In this review, we discuss how BiP's functional cycle and interactions with ERdjs enable it to regulate protein homeostasis in the ER and ensure protein quality control.
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Affiliation(s)
- Kristine Faye R Pobre
- From the Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105
| | - Greg J Poet
- From the Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105
| | - Linda M Hendershot
- From the Department of Tumor Cell Biology, St. Jude Children's Research Hospital, Memphis, Tennessee 38105
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13
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Johnson BM, Radwan FFY, Hossain A, Doonan BP, Hathaway-Schrader JD, God JM, Voelkel-Johnson CV, Banik NL, Reddy SV, Haque A. Endoplasmic reticulum stress, autophagic and apoptotic cell death, and immune activation by a natural triterpenoid in human prostate cancer cells. J Cell Biochem 2018; 120:6264-6276. [PMID: 30378157 DOI: 10.1002/jcb.27913] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 09/25/2018] [Indexed: 12/11/2022]
Abstract
Though the current therapies are effective at clearing an early stage prostate cancer, they often fail to treat late-stage metastatic disease. We aimed to investigate the molecular mechanisms underlying the anticancer effects of a natural triterpenoid, ganoderic acid DM (GA-DM), on two human prostate cancer cell lines: the androgen-independent prostate carcinoma (PC-3), and androgen-sensitive prostate adenocarcinoma (LNCaP). Cell viability assay showed that GA-DM was relatively more toxic to LNCaP cells than to PC-3 cells (IC50 s ranged 45-55 µM for PC-3, and 20-25 µM for LNCaP), which may have occurred due to differential expression of p53. Hoechst DNA staining confirmed detectable nuclear fragmentation in both cell lines irrespective of the p53 status. GA-DM treatment decreased Bcl-2 proteins while it upregulated apoptotic Bax and autophagic Beclin-1, Atg5, and LC-3 molecules, and caused an induction of both early and late events of apoptotic cell death. Biochemical analyses of GA-DM-treated prostate cancer cells demonstrated that caspase-3 cleavage was notable in GA-DM-treated PC-3 cells. Interestingly, GA-DM treatment altered cell cycle progression in the S phase with a significant growth arrest in the G2 checkpoint and enhanced CD4 + T cell recognition of prostate tumor cells. Mechanistic study of GA-DM-treated prostate cancer cells further demonstrated that calpain activation and endoplasmic reticulum stress contributed to cell death. These findings suggest that GA-DM is a candidate for future drug design for prostate cancer as it activates multiple pathways of cell death and immune recognition.
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Affiliation(s)
- Benjamin M Johnson
- Department of Microbiology and Immunology and Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina.,Children's Research Institute, Medical University of South Carolina, Charleston, South Carolina
| | - Faisal F Y Radwan
- Department of Microbiology and Immunology and Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina.,Children's Research Institute, Medical University of South Carolina, Charleston, South Carolina
| | - Azim Hossain
- Department of Microbiology and Immunology and Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina.,Children's Research Institute, Medical University of South Carolina, Charleston, South Carolina
| | - Bently P Doonan
- Department of Microbiology and Immunology and Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina.,Children's Research Institute, Medical University of South Carolina, Charleston, South Carolina
| | - Jessica D Hathaway-Schrader
- Department of Microbiology and Immunology and Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina
| | - Jason M God
- Department of Microbiology and Immunology and Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina.,Children's Research Institute, Medical University of South Carolina, Charleston, South Carolina
| | - Christina V Voelkel-Johnson
- Department of Microbiology and Immunology and Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina
| | - Narendra L Banik
- Department of Neurosciences, Medical University of South Carolina, Charleston, South Carolina
| | - Sakamuri V Reddy
- Children's Research Institute, Medical University of South Carolina, Charleston, South Carolina
| | - Azizul Haque
- Department of Microbiology and Immunology and Hollings Cancer Center, Medical University of South Carolina, Charleston, South Carolina.,Children's Research Institute, Medical University of South Carolina, Charleston, South Carolina
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14
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Taylor IR, Dunyak BM, Komiyama T, Shao H, Ran X, Assimon VA, Kalyanaraman C, Rauch JN, Jacobson MP, Zuiderweg ERP, Gestwicki JE. High-throughput screen for inhibitors of protein-protein interactions in a reconstituted heat shock protein 70 (Hsp70) complex. J Biol Chem 2018; 293:4014-4025. [PMID: 29414793 DOI: 10.1074/jbc.ra117.001575] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2017] [Revised: 01/22/2018] [Indexed: 12/15/2022] Open
Abstract
Protein-protein interactions (PPIs) are an important category of putative drug targets. Improvements in high-throughput screening (HTS) have significantly accelerated the discovery of inhibitors for some categories of PPIs. However, methods suitable for screening multiprotein complexes (e.g. those composed of three or more different components) have been slower to emerge. Here, we explored an approach that uses reconstituted multiprotein complexes (RMPCs). As a model system, we chose heat shock protein 70 (Hsp70), which is an ATP-dependent molecular chaperone that interacts with co-chaperones, including DnaJA2 and BAG2. The PPIs between Hsp70 and its co-chaperones stimulate nucleotide cycling. Thus, to re-create this ternary protein system, we combined purified human Hsp70 with DnaJA2 and BAG2 and then screened 100,000 diverse compounds for those that inhibited co-chaperone-stimulated ATPase activity. This HTS campaign yielded two compounds with promising inhibitory activity. Interestingly, one inhibited the PPI between Hsp70 and DnaJA2, whereas the other seemed to inhibit the Hsp70-BAG2 complex. Using secondary assays, we found that both compounds inhibited the PPIs through binding to allosteric sites on Hsp70, but neither affected Hsp70's intrinsic ATPase activity. Our RMPC approach expands the toolbox of biochemical HTS methods available for studying difficult-to-target PPIs in multiprotein complexes. The results may also provide a starting point for new chemical probes of the Hsp70 system.
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Affiliation(s)
- Isabelle R Taylor
- From the Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94158 and
| | - Bryan M Dunyak
- From the Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94158 and
| | - Tomoko Komiyama
- the Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan 48109
| | - Hao Shao
- From the Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94158 and
| | - Xu Ran
- From the Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94158 and
| | - Victoria A Assimon
- From the Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94158 and
| | - Chakrapani Kalyanaraman
- From the Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94158 and
| | - Jennifer N Rauch
- From the Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94158 and
| | - Matthew P Jacobson
- From the Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94158 and
| | - Erik R P Zuiderweg
- the Department of Biological Chemistry, University of Michigan, Ann Arbor, Michigan 48109
| | - Jason E Gestwicki
- From the Department of Pharmaceutical Chemistry, University of California, San Francisco, California 94158 and
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15
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Jahangirizadeh Z, Ghafouri H, Sajedi RH, Sarikhan S, Taghdir M, Sariri R. Molecular cloning, prokaryotic expression, purification, structural studies and functional implications of Heat Shock Protein 70 (Hsp70) from Rutilus frisii kutum. Int J Biol Macromol 2017; 108:798-807. [PMID: 29107750 DOI: 10.1016/j.ijbiomac.2017.10.174] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 10/26/2017] [Accepted: 10/27/2017] [Indexed: 10/18/2022]
Abstract
A novel Hsp70 chaperone from Rutilus frisii kutum was identified, cloned, expressed, purified and its functional characteristics revealed. The 3D structure of Hsp70 from Rutilus kutum was constructed using the crystal structure of E. coli Hsp70 as the template, with 47% sequence identity. The in vitro ATPase activity assay after 60min, ATP hydrolysis of purified recombinant Hsp70 (8μM) was improved by binding to denatured thermally luciferase (3μM) about 2.5-fold compared with that of Hsp70 alone. Based on the results, it was found that the purified Hsp70 chaperone was able to considerably suppress heat-induced aggregation of luciferase by binding to DnaJ co-chaperone (5μM) more than 70% after 10min at 42°C. In addition, Hsp70 DnaJ complex improved the refolding of heat-shocked luciferase nearly 40% after 60min at 25°C. It was concluded that Hsp70 protein from Rutilus frisii kutum has the critical role in preventing heat-induced aggregation of luciferase and refolding of heat-denatured luciferase was strictly dependent on the activity of Hsp70, thus, this protein can potentially be used for improving the functional properties of luciferase in various applications.
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Affiliation(s)
| | - Hossein Ghafouri
- Department of Biology, Faculty of Science, University of Guilan, Rasht, IR Iran.
| | - Reza H Sajedi
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, IR Iran
| | - Sajjad Sarikhan
- Molecular Bank, Iranian Biological Resource Center (IBRC), ACECR, Tehran, IR Iran
| | - Majid Taghdir
- Department of Biophysics, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, IR Iran
| | - Reyhaneh Sariri
- Department of Biology, Faculty of Science, University of Guilan, Rasht, IR Iran
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16
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Wieteska L, Shahidi S, Zhuravleva A. Allosteric fine-tuning of the conformational equilibrium poises the chaperone BiP for post-translational regulation. eLife 2017; 6:29430. [PMID: 29064369 PMCID: PMC5655141 DOI: 10.7554/elife.29430] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 09/01/2017] [Indexed: 12/12/2022] Open
Abstract
BiP is the only Hsp70 chaperone in the endoplasmic reticulum (ER) and similar to other Hsp70s, its activity relies on nucleotide- and substrate-controllable docking and undocking of its nucleotide-binding domain (NBD) and substrate-binding domain (SBD). However, little is known of specific features of the BiP conformational landscape that tune BiP to its unique tasks and the ER environment. We present methyl NMR analysis of the BiP chaperone cycle that reveals surprising conformational heterogeneity of ATP-bound BiP that distinguishes BiP from its bacterial homologue DnaK. This unusual poise enables gradual post-translational regulation of the BiP chaperone cycle and its chaperone activity by subtle local perturbations at SBD allosteric 'hotspots'. In particular, BiP inactivation by AMPylation of its SBD does not disturb Hsp70 inter-domain allostery and preserves BiP structure. Instead it relies on a redistribution of the BiP conformational ensemble and stabilization the domain-docked conformation in presence of ADP and ATP.
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Affiliation(s)
- Lukasz Wieteska
- School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
| | - Saeid Shahidi
- School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom.,Astbury Centre for Structural Molecular Biology, University of Leeds, Leeds, United Kingdom
| | - Anastasia Zhuravleva
- School of Molecular and Cellular Biology, Faculty of Biological Sciences, University of Leeds, Leeds, United Kingdom
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17
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Human GRP78 affinity towards its signaling partners Ire1α and PERK is differently modulated by an unfolded protein client. Biochem Biophys Res Commun 2017; 487:375-380. [DOI: 10.1016/j.bbrc.2017.04.069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Accepted: 04/13/2017] [Indexed: 11/21/2022]
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18
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Maddalo D, Neeb A, Jehle K, Schmitz K, Muhle-Goll C, Shatkina L, Walther TV, Bruchmann A, Gopal SM, Wenzel W, Ulrich AS, Cato ACB. A peptidic unconjugated GRP78/BiP ligand modulates the unfolded protein response and induces prostate cancer cell death. PLoS One 2012; 7:e45690. [PMID: 23049684 PMCID: PMC3462190 DOI: 10.1371/journal.pone.0045690] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2012] [Accepted: 08/23/2012] [Indexed: 02/07/2023] Open
Abstract
The molecular chaperone GRP78/BiP is a key regulator of protein folding in the endoplasmic reticulum, and it plays a pivotal role in cancer cell survival and chemoresistance. Inhibition of its function has therefore been an important strategy for inhibiting tumor cell growth in cancer therapy. Previous efforts to achieve this goal have used peptides that bind to GRP78/BiP conjugated to pro-drugs or cell-death-inducing sequences. Here, we describe a peptide that induces prostate tumor cell death without the need of any conjugating sequences. This peptide is a sequence derived from the cochaperone Bag-1. We have shown that this sequence interacts with and inhibits the refolding activity of GRP78/BiP. Furthermore, we have demonstrated that it modulates the unfolded protein response in ER stress resulting in PARP and caspase-4 cleavage. Prostate cancer cells stably expressing this peptide showed reduced growth and increased apoptosis in in vivo xenograft tumor models. Amino acid substitutions that destroyed binding of the Bag-1 peptide to GRP78/BiP or downregulation of the expression of GRP78 compromised the inhibitory effect of this peptide. This sequence therefore represents a candidate lead peptide for anti-tumor therapy.
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Affiliation(s)
- Danilo Maddalo
- Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Antje Neeb
- Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Katja Jehle
- Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Katja Schmitz
- Institute of Organic Chemistry, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Claudia Muhle-Goll
- Institute of Biological Interfaces 2, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Liubov Shatkina
- Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Tamara Vanessa Walther
- Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Anja Bruchmann
- Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Srinivasa M. Gopal
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Wolfgang Wenzel
- Institute of Nanotechnology, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Anne S. Ulrich
- Institute of Biological Interfaces 2, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
| | - Andrew C. B. Cato
- Institute of Toxicology and Genetics, Karlsruhe Institute of Technology, Eggenstein-Leopoldshafen, Germany
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19
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Abstract
Recombinant production has become an invaluable tool for supplying research and therapy with proteins of interest. The target proteins are not in every case soluble and/or correctly folded. That is why different production parameters such as host, cultivation conditions and co-expression of chaperones and foldases are applied in order to yield functional recombinant protein. There has been a constant increase and success in the use of folding promoting agents in recombinant protein production. Recent cases are reviewed and discussed in this chapter. Any impact of such strategies cannot be predicted and has to be analyzed and optimized for the corresponding target protein. The in vivo effects of the agents are at least partially comparable to their in vitro mode of action and have been studied by means of modern systems approaches and even in combination with folding/activity screening assays. Resulting data can be used directly for experimental planning or can be fed into knowledge-based modelling. An overview of such technologies is included in the chapter in order to facilitate a decision about the potential in vivo use of folding promoting agents.
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Affiliation(s)
- Beatrix Fahnert
- Cardiff School of Biosciences, Cardiff University, Wales, UK.
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20
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Welsh JP, Bonomo J, Swartz JR. Localization of BiP to translating ribosomes increases soluble accumulation of secreted eukaryotic proteins in an Escherichia coli cell-free system. Biotechnol Bioeng 2011; 108:1739-48. [PMID: 21351069 DOI: 10.1002/bit.23111] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2010] [Revised: 01/04/2011] [Accepted: 02/14/2011] [Indexed: 01/30/2023]
Abstract
The endoplasmic reticulum (ER) resident Hsp70 chaperone, BiP, docks to the Sec translocon and interacts co-translationally with polypeptides entering the ER to encourage proper folding. In order to recreate this interaction in Escherichia coli cell-free protein synthesis (CFPS) reactions, a fusion protein was formed between the ribosome-binding portion of the E. coli protein trigger factor (TF) and BiP. The biophysical affinity to ribosomes as well as the characteristic Hsp70 ATPase activity were both verified for the fusion protein. When added to E. coli-based CFPS reactions, the TF-BiP fusion chaperone increased soluble yields of several protein fragments that are normally secreted through the ER and have poor solubility in typical CFPS reactions. For comparison, a fusion between TF and the native E. coli Hsp70, DnaK, was also constructed. This fusion was also biologically active and increased soluble yields of certain protein targets in CFPS. The TF-BiP fusion described in this study can be seen as a first step in reconstituting and better understanding ER folding pathways in the prokaryotic environment of E. coli CFPS.
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Affiliation(s)
- John P Welsh
- Department of Chemical Engineering, Stanford University, 381 North-South Mall, Stanford, California 94305, USA
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21
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