The 70 kilodalton heat shock proteins (Hsp70s or DnaK) are a family of conserved ubiquitously expressed heat shock proteins. Proteins with similar structure exist in virtually all living organisms. Intracellularly localized Hsp70s are an important part of the cell's machinery for protein folding, performing chaperoning functions, and helping to protect cells from the adverse effects of physiological stresses.[2][3] Additionally, membrane-bound Hsp70s have been identified as a potential target for cancer therapies[4] and their extracellularly localized counterparts have been identified as having both membrane-bound and membrane-free structures.[5]
Discovery
Members of the Hsp70 family are very strongly upregulated by heat stress and toxic chemicals, particularly heavy metals such as arsenic, cadmium, copper, mercury, etc. Heat shock was originally discovered by Ferruccio Ritossa in the 1960s when a lab worker accidentally boosted the incubation temperature of Drosophila (fruit flies). When examining the chromosomes, Ritossa found a "puffing pattern" that indicated the elevated gene transcription of an unknown protein.[6][7] This was later described as the "Heat Shock Response" and the proteins were termed the "Heat Shock Proteins" (Hsps).
Structure
The Hsp70 proteins have three major functional domains:
N-terminalATPase domain – binds ATP (Adenosine triphosphate) and hydrolyzes it to ADP (Adenosine diphosphate). The NBD (nucleotide binding domain) consists of two lobes with a deep cleft between them, at the bottom of which nucleotide (ATP and ADP) binds. The exchange of ATP and ADP leads to conformational changes in the other two domains.
Substrate binding domain – is composed of a 15 kDa β sheet subdomain and a 10 kDa helical subdomain. The β sheet subdomain consists of stranded β sheets with upward protruding loops, as a typical β barrel, which enclose the peptide backbone of the substrate. SBD contains a groove with an affinity for neutral, hydrophobic amino acid residues. The groove is long enough to interact with peptides up to seven residues in length.
C-terminal domain – rich in alpha helical structure acts as a 'lid' for the substrate binding domain. The helical subdomain consists of five helices, with two helices packed against two sides of the β sheet subdomain, stabilizing the inner structure. In addition, one of the helix forms a salt bridge and several hydrogen bonds to the outer Loops, thereby closing the substrate-binding pocket like a lid. Three helices in this domain form another hydrophobic core which may be stabilization of the "lid". When an Hsp70 protein is ATP bound, the lid is open and peptides bind and release relatively rapidly. When Hsp70 proteins are ADP bound, the lid is closed, and peptides are tightly bound to the substrate binding domain.[9]
Protein phosphorylation, a post-translational modification, helps to regulate protein function and involves the phosphorylation of amino acids with hydroxyl groups in their side chains (among eukaryotes). Serine, threonine, and tyrosine amino acids are common targets of phosphorylation. Phosphorylation of Hsp70 has become a point of greater exploration in scientific literature relatively recently. A 2020 publication suggests that phosphorylation of a serine residue between the NBD and substrate binding domain in yeast Hsp70s leads to a dramatic reduction of the normal Hsp70 heat shock response.[10] This deactivation via phosphorylation of a protein is a common motif in protein regulation, and demonstrates how relatively small changes to protein structure can have biologically significant effects on protein function.
Function
The Hsp70 system interacts with extended peptide segments of proteins as well as partially folded proteins to cause aggregation of proteins in key pathways to downregulate activity.[11][8] When not interacting with a substrate peptide, Hsp70 is usually in an ATP bound state. Hsp70 by itself is characterized by a very weak ATPase activity, such that spontaneous hydrolysis will not occur for many minutes. As newly synthesized proteins emerge from the ribosomes, the substrate binding domain of Hsp70 recognizes sequences of hydrophobic amino acid residues, and interacts with them. This spontaneous interaction is reversible, and in the ATP bound state Hsp70 may relatively freely bind and release peptides. However, the presence of a peptide in the binding domain stimulates the ATPase activity of Hsp70, increasing its normally slow rate of ATP hydrolysis. When ATP is hydrolyzed to ADP the binding pocket of Hsp70 closes, tightly binding the now-trapped peptide chain. Further speeding ATP hydrolysis are the so-called J-domain cochaperones: primarily Hsp40 in eukaryotes, and DnaJ in prokaryotes. These cochaperones dramatically increase the ATPase activity of Hsp70 in the presence of interacting peptides.
By binding tightly to partially synthesized peptide sequences (incomplete proteins), Hsp70 prevents them from aggregating and being rendered nonfunctional. Once the entire protein is synthesized, a nucleotide exchange factor (prokaryotic GrpE, eukaryotic BAG1 and HspBP1 are among those which have been identified) stimulates the release of ADP and binding of fresh ATP, opening the binding pocket. The protein is then free to fold on its own, or to be transferred to other chaperones for further processing.[12]HOP (the Hsp70/Hsp90 Organizing Protein) can bind to both Hsp70 and Hsp90 at the same time, and mediates the transfer of peptides from Hsp70 to Hsp90.[13]
Hsp70 also aids in transmembrane transport of proteins, by stabilizing them in a partially folded state. It is also known to be phosphorylated[14] which regulates several of its functions.[15][16][17]
Hsp70 proteins can act to protect cells from thermal or oxidative stress. These stresses normally act to damage proteins, causing partial unfolding and possible aggregation. By temporarily binding to hydrophobic residues exposed by stress, Hsp70 prevents these partially denatured proteins from aggregating, and inhibits them from refolding. Low ATP is characteristic of heat shock and sustained binding is seen as aggregation suppression, while recovery from heat shock involves substrate binding and nucleotide cycling. In a thermophile anaerobe (Thermotoga maritima) the Hsp70 demonstrates redox sensitive binding to model peptides, suggesting a second mode of binding regulation based on oxidative stress.
Hsp70 seems to be able to participate in disposal of damaged or defective proteins. Interaction with CHIP (Carboxyl-terminus of Hsp70 Interacting Protein)–an E3 ubiquitin ligase–allows Hsp70 to pass proteins to the cell's ubiquitination and proteolysis pathways.[18]
Finally, in addition to improving overall protein integrity, Hsp70 directly inhibits apoptosis.[19] One hallmark of apoptosis is the release of cytochrome c, which then recruits Apaf-1 and dATP/ATP into an apoptosome complex. This complex then cleaves procaspase-9, activating caspase-9 and eventually inducing apoptosis via caspase 3 activation. Hsp70 inhibits this process by blocking the recruitment of procaspase-9 to the Apaf-1/dATP/cytochrome c apoptosome complex. It does not bind directly to the procaspase-9 binding site, but likely induces a conformational change that renders procaspase-9 binding less favorable. Hsp70 is shown to interact with Endoplasmic reticulum stress sensor protein IRE1alpha thereby protecting the cells from ER stress - induced apoptosis. This interaction prolonged the splicing of XBP-1 mRNA thereby inducing transcriptional upregulation of targets of spliced XBP-1 like EDEM1, ERdj4 and P58IPK rescuing the cells from apoptosis.[20] Other studies suggest that Hsp70 may play an anti-apoptotic role at other steps, but is not involved in Fas-ligand-mediated apoptosis (although Hsp 27 is). Therefore, Hsp70 not only saves important components of the cell (the proteins) but also directly saves the cell as a whole. Considering that stress-response proteins (like Hsp70) evolved before apoptotic machinery, Hsp70's direct role in inhibiting apoptosis provides an interesting evolutionary picture of how more recent (apoptotic) machinery accommodated previous machinery (Hsps), thus aligning the improved integrity of a cell's proteins with the improved chances of that particular cell's survival.
In mice, exogenous recombinant human Hsp70 (eHsp70), delivered intranasally, increases lifespan. Although the maximum lifespan increased only moderately, the overall mortality rate in treated animals was much lower compared with the control group. Also this eHsp70-treatment improves learning and memory of mice in old age, increases their curiosity.[21]
Given the role of heat shock proteins as an ancient defense system for stabilizing cells and eliminating old and damaged cells, this system has been co-opted by cancer cells to promote their growth.[26] Increased Hsp70 in particular has been shown to inhibit apoptosis of cancer cells,[27] and increased Hsp70 has been shown to be associated with or directly induce endometrial,[28] lung,[29] colon,[30] prostate,[31] and breast[32] cancer, as well as leukemia.[33] Hsp70 in cancer cells may be responsible for tumorigenesis and tumor progression by providing resistance to chemotherapy. Inhibition of Hsp70 has been shown to reduce the size of tumors and can cause their complete regression.[34] Hsp70/Hsp90 is a particularly attractive target for therapeutics, because it is regulated by the inhibition of its ATPase activity, while other HSPs are regulated by nucleotides.[35] Several inhibitors have been designed for Hsp70 that are currently in clinical trials,[36] though as of now HSP90 inhibitors have been more successful.[37] In addition, Hsp70 has been shown to be a regulator of the immune system, activating the immune system as an antigen.[38] Thus, tumor-derived Hsp70 has been suggested as a potential vaccine [39] or avenue to target for immunotherapy.[40] Given the increased expression of Hsp70 in cancer, it has been suggested as a biomarker for cancer prognostics, with high levels portending poor prognosis.[41] An oncogenic mechanism illustrates how extracellular vesicles expressing HSP70 are produced by proliferative Acute Lymphoblastic Leukemia cells and can target and compromise a healthy hematopoiesis system during leukemia development.[42]
Expression in skin tissue
Both Hsp70 and HSP47 were shown to be expressed in dermis and epidermis following laser irradiation, and the spatial and temporal changes in HSP expression patterns define the laser-induced thermal damage zone and the process of healing in tissues. Hsp70 may define biochemically the thermal damage zone in which cells are targeted for destruction, and HSP47 may illustrate the process of recovery from thermally induced damage.[43] HSP70 helps in protecting skin against the increased melanin and wrinkled formation induced due to UV exposure.[44]
Neurodegeneration
Inhibition of Hsp90 leads to Hsp70 and Hsp40 upregulation, which can channel misfolded protein for proteasome degradation, which can potentially inhibit the progression of neurodegenerative diseases.[45] For example, Hsp70 overexpression in human neuroglioma cells transfected with mutant alpha-synuclein led to 50% less oligomeric alpha-synuclein species,[46] pointing towards the possibility that increasing its expression could diminish the spread of Parkinson's disease. Similarly, Hsp70 overexpression suppressed poly-Q dependent aggregation and neurodegeneration in cell cultures, yeast,[47] fly,[48] and mouse [49] models, and deletion of hsp70 increased the size of polyQ inclusion bodies,[50] suggesting that increasing its expression could help to prevent Huntington's disease. Similarly, reductions in Hsp70 have been shown in transgenic mouse models of ALS and patients with sporadic ALS.[51] Lastly, increased expression or activity of Hsp70 has been proposed as a method to prevent the progression of Alzheimer's disease, because knock down of Hsp70 promoted A-beta toxicity,[52] and Hsp70 was shown to promote tau stability, while Hsp70 levels are decreased in tauopathies like Alzheimer's disease.[53] Given the complex interplay between the different chaperone proteins, therapeutic development in this field is aimed at investigating how the chaperone network as a whole can be manipulated and the effect of this manipulation on the progression of neurodegenerative disease, but the balance of Hsp70 and Hsp90 levels appears to be central in this pathophysiology.
In diabetes
The fluctuations in the levels of chaperone HSP70 affect the homeostasis. Diabetes leads to several microvasculature and microvasculature diseases like retinopathy, Toll like receptors are integral part of innate immune system and eHSP70 binds to toll like receptors and activates the MyD88 pathway, further stimulating NF-kB, cytokines like TNFα and IL1 β, increased production of reactive oxygen species contributing to insulin resistance and diabetes. Whereas there is decrease in the levels of iHSP70.[54]
In cardiovascular diseases
HSP70 is a chaperone with ubiquitous presence.[55] It is crucial in the cardiovascular system. HSP70 normally aids in protein folding and aggregation; when present in the cell, functioning as an anti-inflammatory molecule; however, under stress conditions, it is localized to the extracellular milieu, where it is involved in inducing inflammatory pathways and contributes to disease pathogenesis.[56] It is well established that intracellular HSP70 (iHSP70) levels play a protective role, whereas extracellular HSP70 (eHSP70) levels in circulating blood are linked to pathophysiology in micro and microvasculature, which results in a variety of cardiovascular illnesses. HSP70 homologues identified in human cytosol includes HSPA1A, HSPA1B, HSPA1L, HSPA12B, HSPA13, HSPA14 whereas HSPA9 in mitochondria. The HSP70 acts as DAMP and activates innate immune response which as involved in cardiovascular disease progression.[57]
The chaperone protein acts as auto antigen in atherosclerosis. Increased oxidative stress causes the formation of high-density oxidized LDL, the first event in the formation of plaque. This activates HSP70 and its promoter in the endothelial and smooth muscle cells, which contributes to atherosclerosis by inducing JAK/STAT pathway expression.[58][59]
HSP70 is also linked to high blood pressure, a worldwide concern and risk factor for a variety of cardiovascular diseases. Hypertension causes endothelial dysfunction and vascular wall damage, both of which contribute to arterial stiffness and atherosclerosis.[60] HSPA1A, HSPA1B, and HSPA1L are three genes in humans that encode HSP70, and their polymorphism is linked to the onset of high blood pressure and cardiovascular disease.[61] Angiotensin II, endothelin-1, or phenylepinephrine cause HSP70 overexpression, which activates several molecular pathways, resulting in increased production of ROS, CRP, IL-10, TNF-alpha, and IL-6 [62][61] These inflammatory signals interfere with the antioxidant machinery and results in rapid disease progression.
HSP70 expression increases after the coronary bypass surgery. Exercise has a positive and protective impact on cardiovascular disorders and stimulates the increased production of chaperone protein together known to be cardioprotective.
Family members
Prokaryotes express three Hsp70 proteins: DnaK, HscA (Hsc66), and HscC (Hsc62).[63]
Eukaryotic organisms express several slightly different Hsp70 proteins. All share the common domain structure, but each has a unique pattern of expression or subcellular localization. These are, among others:
Hsc70 (Hsp73/HSPA8) is a constitutively expressed chaperone protein. It typically makes up one to three percent of total cellular protein.
Hsp70 (encoded by three very closely related paralogs: HSPA1A, HSPA1B, and HSPA1L) is a stress-induced protein. High levels can be produced by cells in response to hyperthermia, oxidative stress, and changes in pH.
Hsp90s are essential for protein remodeling, similar to Hsp70 proteins, and play an especially vital role in eukaryotes, where it has been suggested that Hsp90 interacts with the DnaK system (composed of DnaK, GrpE, and either DnaJ or CbpA) to facilitate the process of protein remodeling.[65] In E. coli, Hsp90s works collaboratively with Hsp70s to facilitate protein remodeling and activation. Hsp90Ec and DnaK are chaperones of Hsp90 and Hsp70, respectively. DnaK initially binds and stabilizes the misfolded protein before working collaboratively with Hsp90Ec to refold this substrate and cause its activation. Given conditions of excess DnaK, this chaperone has been found to inhibit remodeling of proteins. However, the presence of Hsp90Ec can mitigate this effect and enable protein remodeling despite conditions of excess DnaK.[66]
The Hsp70 superfamily also includes a family of Hsp110/Grp170 (Sse) proteins, which are larger proteins related to Hsp70.[67] The Hsp110 family of proteins have divergent functions: yeast Sse1p has little ATPase activity but is a chaperone on its own as well as a nucleotide exchange factor for Hsp70, while the closely related Sse2p has little unfoldase activity.[12]
The following is a list of currently named human HSP110 genes. HSPH2-4 are proposed names and the current name is linked:[67]
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^ abcVostakolaei MA, Hatami-Baroogh L, Babaei G, Molavi O, Kordi S, Abdolalizadeh J (May 2021). "Hsp70 in cancer: A double agent in the battle between survival and death". Journal of Cellular Physiology. 236 (5): 3420–3444. doi:10.1002/jcp.30132. PMID33169384. S2CID226295557.
^ abBracher A, Verghese J (2015). "GrpE, Hsp110/Grp170, HspBP1/Sil1 and BAG Domain Proteins: Nucleotide Exchange Factors for Hsp70 Molecular Chaperones". The Networking of Chaperones by Co-chaperones. Subcellular Biochemistry. Vol. 78. pp. 1–33. doi:10.1007/978-3-319-11731-7_1. ISBN978-3-319-11730-0. PMID25487014.
^Wegele H, Müller L, Buchner J (2004). "Hsp70 and Hsp90—a relay team for protein folding". Hsp70 and Hsp90 – a relay team for protein folding. Reviews of Physiology, Biochemistry and Pharmacology. Vol. 151. pp. 1–44. doi:10.1007/s10254-003-0021-1. ISBN978-3-540-22096-1. PMID14740253. {{cite book}}: |journal= ignored (help)
^Cvoro A, Dundjerski J, Trajković D, Matić G (1999-04-01). "The level and phosphorylation of Hsp70 in the rat liver cytosol after adrenalectomy and hyperthermia". Cell Biology International. 23 (4): 313–20. doi:10.1006/cbir.1998.0247. PMID10600240. S2CID9113738.
^Beere HM, Wolf BB, Cain K, Mosser DD, Mahboubi A, Kuwana T, et al. (August 2000). "Heat-shock protein 70 inhibits apoptosis by preventing recruitment of procaspase-9 to the Apaf-1 apoptosome". Nature Cell Biology. 2 (8): 469–75. doi:10.1038/35019501. PMID10934466. S2CID1507966.
^Ricaniadis N, Kataki A, Agnantis N, Androulakis G, Karakousis CP (February 2001). "Long-term prognostic significance of HSP-70, c-myc and HLA-DR expression in patients with malignant melanoma". European Journal of Surgical Oncology. 27 (1): 88–93. doi:10.1053/ejso.1999.1018. PMID11237497.
^Ramp U, Mahotka C, Heikaus S, Shibata T, Grimm MO, Willers R, Gabbert HE (October 2007). "Expression of heat shock protein 70 in renal cell carcinoma and its relation to tumor progression and prognosis". Histology and Histopathology. 22 (10): 1099–107. doi:10.14670/HH-22.1099. PMID17616937.
^Black JD, Rezvani K (2016). "Heat Shock Protein 70s as Potential Molecular Targets for Colon Cancer Therapeutics". Current Medicinal Chemistry. 23 (28): 3171–3188. doi:10.2174/0929867323666160627105033. PMID27356538.
^Powers MV, Jones K, Barillari C, Westwood I, van Montfort RL, Workman P (April 2010). "Targeting HSP70: the second potentially druggable heat shock protein and molecular chaperone?". Cell Cycle. 9 (8): 1542–50. doi:10.4161/cc.9.8.11204. PMID20372081. S2CID37329279.
^Mellatyar H, Talaei S, Pilehvar-Soltanahmadi Y, Barzegar A, Akbarzadeh A, Shahabi A, et al. (June 2018). "Targeted cancer therapy through 17-DMAG as an Hsp90 inhibitor: Overview and current state of the art". Biomedicine & Pharmacotherapy. 102: 608–617. doi:10.1016/j.biopha.2018.03.102. PMID29602128. S2CID4505299.
^Kumar S, Deepak P, Kumar S, Kishore D, Acharya A (2009). "Autologous Hsp70 induces antigen specific Th1 immune responses in a murine T-cell lymphoma". Immunological Investigations. 38 (6): 449–65. doi:10.1080/08820130902802673. PMID19811405. S2CID24747281.
^Cai WF, Zhang XW, Yan HM, Ma YG, Wang XX, Yan J, et al. (October 2010). "Intracellular or extracellular heat shock protein 70 differentially regulates cardiac remodelling in pressure overload mice". Cardiovascular Research. 88 (1): 140–149. doi:10.1093/cvr/cvq182. PMID20542874.
^Wick C (2019). "Heat Shock Protein 60: A Mediator of Atherosclerosis and Its Potential Therapeutic Role". Chaperokine Activity of Heat Shock Proteins. Vol. 16. Cham: Springer International Publishing. pp. 81–103. doi:10.1007/978-3-030-02254-9_4. ISBN978-3-030-02253-2. S2CID104325416.
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