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The co-expression of denileukin diftitox immunotoxin with Artemin: soluble and aggregation analysis in presence of an efficient protein chaperone. Biologia (Bratisl) 2021. [DOI: 10.1007/s11756-021-00846-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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2
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Marvastizadeh N, Dabirmanesh B, Sajedi RH, Khajeh K. Anti-amyloidogenic effect of artemin on α-synuclein. Biol Chem 2021; 401:1143-1151. [PMID: 32673279 DOI: 10.1515/hsz-2019-0446] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2019] [Accepted: 04/20/2020] [Indexed: 11/15/2022]
Abstract
α-Synuclein fibrillation is now regarded as a major pathogenic process in Parkinson's disease and its proteinaceous deposits are also detected in other neurological disorders including Alzheimer's disease. Therefore anti-amyloidegenic compounds may delay or prevent the progression of synucleinopathies disease. Molecular chaperones are group of proteins which mediate correct folding of proteins by preventing unsuitable interactions which may lead to aggregation. The objective of this study was to investigate the anti-amyloidogenic effect of molecular chaperone artemin on α-synuclein. As the concentration of artemin was increased up to 4 μg/ml, a decrease in fibril formation of α-synuclein was observed using thioflavin T (ThT) fluorescence and congo red (CR) assay. Transmission electron microscopy (TEM) images also demonstrated a reduction in fibrils in the presence of artemin. The secondary structure of α-synuclein was similar to its native form prior to fibrillation when incubated with artemin. A cell-based assay has shown that artemin inhibits α-synuclein aggregation and reduce cytotoxicity, apoptosis and reactive oxygen species (ROS) production. Our results revealed that artemin has efficient chaperon activity for preventing α-synuclein fibril formation and toxicity.
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Affiliation(s)
- Narges Marvastizadeh
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
| | - Bahareh Dabirmanesh
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
| | - Reza H Sajedi
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
| | - Khosro Khajeh
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, P.O. Box 14115-175, Tehran, Iran
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Takalloo Z, Ardakani ZA, Maroufi B, Shahangian SS, Sajedi RH. Stress-dependent conformational changes of artemin: Effects of heat and oxidant. PLoS One 2020; 15:e0242206. [PMID: 33196673 PMCID: PMC7668597 DOI: 10.1371/journal.pone.0242206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Accepted: 10/28/2020] [Indexed: 11/24/2022] Open
Abstract
Artemin is an abundant thermostable protein in Artemia embryos and it is considered as a highly efficient molecular chaperone against extreme environmental stress conditions. The conformational dynamics of artemin have been suggested to play a critical role in its biological functions. In this study, we have investigated the conformational and functional changes of artemin under heat and oxidative stresses to identify the relationship between its structure and function. The tertiary and quaternary structures of artemin were evaluated by fluorescence measurements, protein cross-linking analysis, and dynamic light scattering. Based on the structural analysis, artemin showed irreversible substantial conformational lability in responses to heat and oxidant, which was mainly mediated through the hydrophobic interactions and dimerization of the chaperone. In addition, the chaperone-like activity of heated and oxidized artemin was examined using lysozyme refolding assay and the results showed that although both factors, i.e. heat and oxidant, at specific levels improved artemin potency, simultaneous incubation with both stressors significantly triggered the chaperone activation. Moreover, the heat-induced dimerization of artemin was found to be the most critical factor for its activation. It was suggested that oxidation presumably acts through stabilizing the dimer structures of artemin through formation of disulfide bridges between the subunits and strengthens its chaperoning efficacy. Accordingly, it is proposed that artemin probably exists in a monomer–oligomer equilibrium in Artemia cysts and environmental stresses and intracellular portion of protein substrates may shift the equilibrium towards the active dimer forms of the chaperone.
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Affiliation(s)
- Zeinab Takalloo
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Zahra Afshar Ardakani
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | | | | | - Reza H. Sajedi
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
- * E-mail:
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Hibshman JD, Clegg JS, Goldstein B. Mechanisms of Desiccation Tolerance: Themes and Variations in Brine Shrimp, Roundworms, and Tardigrades. Front Physiol 2020; 11:592016. [PMID: 33192606 PMCID: PMC7649794 DOI: 10.3389/fphys.2020.592016] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Accepted: 09/25/2020] [Indexed: 01/05/2023] Open
Abstract
Water is critical for the survival of most cells and organisms. Remarkably, a small number of multicellular animals are able to survive nearly complete drying. The phenomenon of anhydrobiosis, or life without water, has been of interest to researchers for over 300 years. In this review we discuss advances in our understanding of protectants and mechanisms of desiccation tolerance that have emerged from research in three anhydrobiotic invertebrates: brine shrimp (Artemia), roundworms (nematodes), and tardigrades (water bears). Discovery of molecular protectants that allow each of these three animals to survive drying diversifies our understanding of desiccation tolerance, and convergent themes suggest mechanisms that may offer a general model for engineering desiccation tolerance in other contexts.
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Affiliation(s)
- Jonathan D. Hibshman
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
| | - James S. Clegg
- Bodega Marine Laboratory, University of California, Davis, Davis, CA, United States
| | - Bob Goldstein
- Department of Biology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, United States
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Takalloo Z, Masroor MJ, Mani-Varnosfaderani A, Maroufi B, H Sajedi R. Probing heat and oxidation induced conformational changes of molecular chaperone artemin by excitation-emission fluorescence spectroscopy. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2020; 211:112013. [PMID: 32919176 DOI: 10.1016/j.jphotobiol.2020.112013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Revised: 07/17/2020] [Accepted: 08/31/2020] [Indexed: 12/18/2022]
Abstract
Artemin is a potent molecular chaperone, which protects Artemia embryos undergoing encystment against extreme environmental stresses. In the present work, we have examined the structural changes of artemin from A. urmiana upon exposure to oxidant and heat, by using CD measurements as well as excitation-emission fluorescence spectroscopy as a powerful tool for monitoring the conformational transitions and molecular interactions in proteins. We have also provided here the first document on reporting the three dimensional fluorescence spectra of a protein using ANS. Totally, the fluorescence results indicated that the microenvironments of tyrosine and tryptophan residues and the hydrophobic pockets as well as the polypeptide backbone or secondary structure of the chaperone were influenced in responses to heat and H2O2 in different degrees. Moreover, the native state of artemin did not induce a considerable exposure of the internal non-polar groups to the solvent. Besides, the excitation-emission spectra of heated artemin by ANS revealed new emission peaks at 430-450 nm when it was excited at 330 nm, which suggests probable exposure of new binding sites for hydrophobic or electrostatic interactions of the protein with ANS. The protein also showed a greater conformational sensitivity to the temperature fluctuations compared to oxidation. Here, we presented some evidence in support of the relation between artemin and its stress dependent activation in vitro and in vivo. This study can expect that the EEM fluorescence spectroscopy could provide a promising tool to study conformational transitions of proteins.
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Affiliation(s)
- Zeinab Takalloo
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Mohammad Javad Masroor
- Department of Chemistry, Faculty of Basic Sciences, Tarbiat Modares University, Tehran, Iran
| | | | | | - Reza H Sajedi
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran.
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6
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Khodajou-Masouleh H, Shahangian SS, Attar F, H Sajedi R, Rasti B. Characteristics, dynamics and mechanisms of actions of some major stress-induced biomacromolecules; addressing Artemia as an excellent biological model. J Biomol Struct Dyn 2020; 39:5619-5637. [PMID: 32734830 DOI: 10.1080/07391102.2020.1796793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Stress tolerance is one of the most prominent and interesting topics in biology since many macro- and micro-adaptations have evolved in resistant organisms that are worth studying. When it comes to confronting various environmental stressors, the extremophile Artemia is unrivaled in the animal kingdom. In the present review, the evolved molecular and cellular basis of stress tolerance in resistant biological systems are described, focusing on Artemia cyst as an excellent biological model. The main purpose of the review is to discuss how the structure and physicochemical characteristics of protective factors such as late embryogenesis abundant proteins (LEAPs), small heat shock proteins (sHSPs) and trehalose are related to their functions and by which mechanisms, they exert their functions. In addition, some metabolic depressors in Artemia encysted embryos are also mentioned, indirectly playing important roles in stress tolerance. Importantly, a great deal of attention is given to the LEAPs, exhibiting distinctive folding behaviors and mechanisms of actions. For instance, molecular shield function, chaperone-like activity, moonlighting property, sponging and snorkeling capabilities of the LEAPs are delineated here. Moreover, the molecular interplay between some of these factors is mentioned, leading to their synergistic effects. Interestingly, Artemia life cycle adapts to environmental conditions. Diapause is the defense mode of this life cycle, safeguarding Artemia encysted embryos against various environmental stressors. Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
| | - S Shirin Shahangian
- Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran
| | - Farnoosh Attar
- Department of Biology, Faculty of Food Industry & Agriculture, Standard Research Institute (SRI), Karaj, Iran
| | - Reza H Sajedi
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Behnam Rasti
- Department of Microbiology, Faculty of Basic Sciences, Lahijan Branch, Islamic Azad University (IAU), Lahijan, Guilan, Iran
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Ramshini H, Moghaddasi AS, Mollania N, Khodarahmi R. Diverse antithetical effects of the bio-compatible Ag-NPs on the hen egg lysozyme amyloid aggregation: from an efficient inhibitor to obscure inducer. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2018. [DOI: 10.1007/s13738-018-1478-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Mosaddegh B, Takalloo Z, Sajedi RH, Shirin Shahangian S, Hassani L, Rasti B. An inter-subunit disulfide bond of artemin acts as a redox switch for its chaperone-like activity. Cell Stress Chaperones 2018; 23:685-693. [PMID: 29429019 PMCID: PMC6045527 DOI: 10.1007/s12192-018-0880-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Revised: 11/25/2017] [Accepted: 01/22/2018] [Indexed: 12/14/2022] Open
Abstract
Encysted embryos of Artemia are among the most stress-resistant eukaryotes partly due to the massive amount of a cysteine-rich protein termed artemin. High number of cysteine residues in artemin and their intramolecular spatial positions motivated us to investigate the role of the cysteine residues in the chaperone-like activity of artemin. According to the result of Ellman's assay, there are nine free thiols (seven buried and two exposed) and one disulfide bond per monomer of artemin. Subsequent theoretical analysis of the predicted 3D structure of artemin confirmed the data obtained by the spectroscopic study. Native and reduced/modified forms of artemin were also compared with respect to their efficiency in chaperoning activity, tertiary structure, and stability. Since the alkylation and reduction of artemin diminished its chaperone activity, it appears that its chaperoning potential depends on the formation of intermolecular disulfide bond and the presence of cysteine residues. Comparative fluorescence studies on the structure and stability of the native and reduced protein revealed some differences between them. Due to the redox-dependent functional switching of artemin from the less to more active form, it can be finally suggested as a redox-dependent chaperone.
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Affiliation(s)
- Bita Mosaddegh
- Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran
| | - Zeinab Takalloo
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, 14115-154, Iran
| | - Reza H Sajedi
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, 14115-154, Iran.
| | - S Shirin Shahangian
- Department of Biology, Faculty of Sciences, University of Guilan, Rasht, Iran
| | - Leila Hassani
- Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan, 45195-1159, Iran
| | - Behnam Rasti
- Department of Microbiology, Faculty of Basic Sciences, Lahijan Branch, Islamic Azad University (IAU), Lahijan, Guilan, Iran
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9
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Khosrowabadi E, Takalloo Z, Sajedi RH, Khajeh K. Improving the soluble expression of aequorin in Escherichia coli using the chaperone-based approach by co-expression with artemin. Prep Biochem Biotechnol 2018; 48:483-489. [DOI: 10.1080/10826068.2018.1466152] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Elaheh Khosrowabadi
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Zeinab Takalloo
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Reza H. Sajedi
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Khosro Khajeh
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
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Khosravi Z, Nasiri Khalili MA, Moradi S, Hassan Sajedi R, Zeinoddini M. The Molecular Chaperone Artemin Efficiently Blocks Fibrillization of TAU Protein In Vitro. CELL JOURNAL 2017; 19:569-577. [PMID: 29105391 PMCID: PMC5672095 DOI: 10.22074/cellj.2018.4510] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/11/2016] [Accepted: 11/03/2016] [Indexed: 11/17/2022]
Abstract
Objective Aggregation of the TAU proteins in the form of neurofibrillary tangles (NFTs) in the brain is a common risk
factor in tauopathies including Alzheimer’s disease (AD). Several strategies have been implemented to target NFTs,
among which chaperones, which facilitate the proper folding of proteins, appear to hold great promise in effectively
inhibiting TAU polymerization. The aim of this study was to analyze the impact of the chaperone Artemin on TAU
aggregation in vitro.
Materials and Methods In this experimental study, recombinant TAU- or Artemin proteins were expressed in E.coli
bacteria, and purified using ion-exchange and affinity chromatography. Sodium dodecyl sulfate-poly acrylamide gel
electrophoresis (SDS-PAGE) was used to run the extracted proteins and check their purity. Heparin was used as an
aggregation inducer. The interaction kinetics of TAU aggregation and disassembly was performed using thioflavin T
(ThT) fluorescence analysis and circular dichroism (CD) spectroscopy.
Results Ion-exchange and affinity chromatography yielded highly pure TAU and Artemin proteins for subsequent
analyses. In addition, we found that heparin efficiently induced TAU fibrillization 48 hours post-incubation, as evidenced
by ThT assay. Importantly, Artemin was observed to effectively block the aggregation of both physiologic- and supra-
physiologic TAU concentrations in a dose-dependent manner, as judged by ThT and CD spectroscopy analyses.
Conclusion Our collective results show, for the first time, that the chaperone Artemin could significantly inhibit
aggregation of the TAU proteins in a dose-dependent manner, and support Artemin as a potential potent blocker of TAU
aggregation in people with AD.
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Affiliation(s)
- Zahra Khosravi
- Department of Biosciences and Biotechnology, Malek Ashtar University of Technology, Tehran, Iran
| | | | - Sharif Moradi
- Department of Stem Cells and Developmental Biology, Cell Science Research Center, Royan Institute for Stem Cell Biology and Technology, ACECR, Tehran, Iran.,Department of Developmental Biology, University of Science and Culture, Tehran, Iran
| | - Reza Hassan Sajedi
- Department of Biochemistry, Faculty of Biological Sciences, Tarbiat Modares University, Tehran, Iran
| | - Mehdi Zeinoddini
- Department of Biosciences and Biotechnology, Malek Ashtar University of Technology, Tehran, Iran
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11
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Takalloo Z, Sajedi RH, Hosseinkhani S, Moazzenzade T. Artemin protects cells and proteins against oxidative and salt stress. Int J Biol Macromol 2017; 95:618-624. [DOI: 10.1016/j.ijbiomac.2016.11.088] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 11/19/2016] [Accepted: 11/21/2016] [Indexed: 10/20/2022]
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12
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Sluchanko NN, Gusev NB. Moonlighting chaperone‐like activity of the universal regulatory 14‐3‐3 proteins. FEBS J 2017; 284:1279-1295. [DOI: 10.1111/febs.13986] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Revised: 11/20/2016] [Accepted: 12/06/2016] [Indexed: 12/25/2022]
Affiliation(s)
- Nikolai N. Sluchanko
- Laboratory of Structural Biochemistry of Proteins A. N. Bach Institute of Biochemistry Federal Research Center of Biotechnology of the Russian Academy of Sciences Moscow Russia
| | - Nikolai B. Gusev
- Department of Biochemistry School of Biology Moscow State University Russia
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13
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Takalloo Z, Sajedi RH, Hosseinkhani S, Asghari SM. Real-time monitoring of artemin in vivo chaperone activity using luciferase as an intracellular reporter. Arch Biochem Biophys 2016; 610:33-40. [DOI: 10.1016/j.abb.2016.09.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2016] [Revised: 09/25/2016] [Accepted: 09/27/2016] [Indexed: 12/21/2022]
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MacRae TH. Stress tolerance during diapause and quiescence of the brine shrimp, Artemia. Cell Stress Chaperones 2016; 21:9-18. [PMID: 26334984 PMCID: PMC4679736 DOI: 10.1007/s12192-015-0635-7] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2015] [Revised: 08/12/2015] [Accepted: 08/24/2015] [Indexed: 02/06/2023] Open
Abstract
Oviparously developing embryos of the brine shrimp, Artemia, arrest at gastrulation and are released from females as cysts before entering diapause, a state of dormancy and stress tolerance. Diapause is terminated by an external signal, and growth resumes if conditions are permissible. However, if circumstances are unfavorable, cysts enter quiescence, a dormant stage that continues as long as adverse conditions persist. Artemia embryos in diapause and quiescence are remarkably resistant to environmental and physiological stressors, withstanding desiccation, cold, heat, oxidation, ultraviolet radiation, and years of anoxia at ambient temperature when fully hydrated. Cysts have adapted to stress in several ways; they are surrounded by a rigid cell wall impermeable to most chemical compounds and which functions as a shield against ultraviolet radiation. Artemia cysts contain large amounts of trehalose, a non-reducing sugar thought to preserve membranes and proteins during desiccation by replacing water molecules and/or contributing to vitrification. Late embryogenesis abundant proteins similar to those in seeds and other anhydrobiotic organisms are found in cysts, and they safeguard cell organelles and proteins during desiccation. Artemia cysts contain abundant amounts of p26, a small heat shock protein, and artemin, a ferritin homologue, both ATP-independent molecular chaperones important in stress tolerance. The evidence provided in this review supports the conclusion that it is the interplay of these protective elements that make Artemia one of the most stress tolerant of all metazoan organisms.
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Affiliation(s)
- Thomas H MacRae
- Department of Biology, Dalhousie University, Halifax, N.S., B3H 4R2, Canada.
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King AM, Toxopeus J, MacRae TH. Artemin, a diapause-specific chaperone, contributes to the stress tolerance of Artemia franciscana cysts and influences their release from females. ACTA ACUST UNITED AC 2014; 217:1719-24. [PMID: 24526727 DOI: 10.1242/jeb.100081] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Females of the crustacean Artemia franciscana produce either motile nauplii or gastrula stage embryos enclosed in a shell impermeable to nonvolatile compounds and known as cysts. The encysted embryos enter diapause, a state of greatly reduced metabolism and profound stress tolerance. Artemin, a diapause-specific ferritin homolog in cysts has molecular chaperone activity in vitro. Artemin represents 7.2% of soluble protein in cysts, approximately equal to the amount of p26, a small heat shock protein. However, there is almost twice as much artemin mRNA in cysts as compared with p26 mRNA, suggesting that artemin mRNA is translated less efficiently. RNA interference employing the injection of artemin double-stranded RNA into the egg sacs of A. franciscana females substantially reduced artemin mRNA and protein in cysts. Decreasing artemin diminished desiccation and freezing tolerance of cysts, demonstrating a role for this protein in stress resistance. Knockdown of artemin increased the time required for complete discharge of a brood of cysts carried within a female from a few hours up to 4 days, an effect weakened in successive broods. Artemin, an abundant molecular chaperone, contributes to stress tolerance of A. franciscana cysts while influencing their development and/or exit from females.
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Affiliation(s)
- Allison M King
- Department of Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Jantina Toxopeus
- Department of Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
| | - Thomas H MacRae
- Department of Biology, Dalhousie University, Halifax, NS B3H 4R2, Canada
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Tomar R, Garg DK, Mishra R, Thakur AK, Kundu B. N-terminal domain ofPyrococcus furiosusl-asparaginase functions as a non-specific, stable, molecular chaperone. FEBS J 2013; 280:2688-99. [DOI: 10.1111/febs.12271] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 03/25/2013] [Accepted: 03/27/2013] [Indexed: 11/28/2022]
Affiliation(s)
- Rachana Tomar
- Kusuma School of Biological Sciences; Indian Institute of Technology Delhi; New Delhi; India
| | - Dushyant K. Garg
- Kusuma School of Biological Sciences; Indian Institute of Technology Delhi; New Delhi; India
| | - Rahul Mishra
- Department of Biological Sciences and Bioengineering; Indian Institute of Technology Kanpur; India
| | - Ashwani K. Thakur
- Department of Biological Sciences and Bioengineering; Indian Institute of Technology Kanpur; India
| | - Bishwajit Kundu
- Kusuma School of Biological Sciences; Indian Institute of Technology Delhi; New Delhi; India
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17
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Hassani L, Sajedi RH. Effect of artemin on structural transition of β-lactoglobulin. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2013; 105:24-28. [PMID: 23291197 DOI: 10.1016/j.saa.2012.12.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2012] [Revised: 10/24/2012] [Accepted: 12/02/2012] [Indexed: 06/01/2023]
Abstract
Encysted embryos of Artemia are exceptionally resistant to severe environmental stress. This resistance is thought to depend in part on the existence of a protein termed artemin. There is only little information about the function of artemin. It has been reported artemin is a thermostable protein with RNA-binding ability. In addition, it reduces the extent of aggregation significantly and enhances the efficiency of refolding and activity recovery of carbonic anhydrase and horseradish peroxidase. In this study, the effect of artemin purified from Artemia urmiana on bovine β-lactoglobulin (BLG) and its α-helical intermediate state has been evaluated by circular dichroism and intrinsic and extrinsic fluorescence spectroscopy. The results obtained in aqueous buffer show, artemin decreases the compactness of BLG structure and causes to the exposure of some hydrophobic groups. The results also indicate artemin has an inhibitory effect on β-sheet→α-helix transition in the secondary structure of β-lactoglobulin. Since this transition occurs during unfolding of β-lactoglobulin, it seems artemin influences on the folding pathway of β-lactoglobulin. This structural effect of artemin can result from its high surface hydrophobicity. Consequently, it is expected that artemin has chaperoning potency because of its effect on the folding of BLG.
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Affiliation(s)
- Leila Hassani
- Department of Biological Sciences, Institute for Advanced Studies in Basic Sciences (IASBS), Zanjan 45195-1159, Iran.
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