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Hui Wang, Xue-Nan Li, Peng-Cheng Li, Wei Liu, Zheng-Hai Du, Jin-Long Li
Di(2-ethylhexyl) phthalate (DEHP) is an omnipresent environmental pollutant with endocrine disrupting properties. As a plasticizer, DEHP can be leach from the plastic to transfer the external environment and thus enters the animal food chain, causing serious damage to the animal organs. The heat-shock response (HSR) comprising heat-shock protein (HSPs) and heat-shock transcription factor (HSFs) plays a pivotal role in various toxic stress conditions. For the sake of investigating the effects of DEHP exposure on cardiac toxicity and the regulation of HSR, male quail were fed the diet with 0, 250, 500 and 750 mg/kg DEHP by gavage administration for 45 days...
October 2, 2018: Chemosphere
Brittany M Berger, June H Kim, Emily R Hildebrandt, Ian C Davis, Michael C Morgan, James L Hougland, Walter K Schmidt
Protein isoprenylation targets a subset of COOH-terminal Cxxx tetrapeptide sequences that has been operationally defined as a CaaX motif. The specificity of the farnesyl transferase toward each of the possible 8000 combinations of Cxxx sequences, however, remains largely unresolved. In part, it has been difficult to consolidate results stemming from in vitro and in silico approaches that yield a wider array of prenylatable sequences relative to those known in vivo We have investigated whether this disconnect results from the multi-step complexity of post-translational modification that occurs in vivo to CaaX proteins...
September 26, 2018: Genetics
Weibin Gong, Wanhui Hu, Linan Xu, Huiwen Wu, Si Wu, Hong Zhang, Jinfeng Wang, Gary W Jones, Sarah Perrett
The allosteric coupling of the highly conserved nucleotide- and substrate-binding domains of Hsp70 has been studied intensively. In contrast, the role of the disordered, highly variable C-terminal region of Hsp70 remains unclear. In many eukaryotic Hsp70s, the extreme C-terminal EEVD motif binds to tetratricopeptide-repeat domains of Hsp70 co-chaperones. Here, we discovered that the TVEEVD sequence of Saccharomyces cerevisiae cytoplasmic Hsp70 (Ssa1) functions as a SUMO-interacting motif. A second C-terminal motif of ~15 amino acids between the α-helical lid and the extreme C terminus, previously identified in bacterial and eukaryotic organellar Hsp70s, is known to enhance chaperone function by transiently interacting with folding clients...
September 18, 2018: Journal of Biological Chemistry
Lars Sjögren, Maïna Floris, Andrea Barghetti, Franziska Völlmy, Rune Linding, Peter Brodersen
ARGONAUTE1 (AGO1) binds directly to small regulatory RNA and is a key effector protein of posttranscriptional gene silencing mediated by microRNA (miRNA) and small interfering RNA (siRNA) in Arabidopsis. The formation of an RNA induced silencing complex (RISC) of AGO1 and small RNA requires the function of the Heat Shock Protein 70/90 chaperone system. Some functions of AGO1 occur in association with endomembranes, in particular the rough endoplasmic reticulum (rER), but proteins interacting with AGO1 in membrane fractions remain unidentified...
September 7, 2018: Journal of Biological Chemistry
Huafeng Xu
The heat shock protein 70 (Hsp70) chaperones, vital to the proper folding of proteins inside cells, consume ATP and require cochaperones in assisting protein folding. It is unclear whether Hsp70 can utilize the free energy from ATP hydrolysis to fold a protein into a native state that is thermodynamically unstable in the chaperone-free equilibrium. Here I present a model of Hsp70-mediated protein folding, which predicts that Hsp70, as a result of differential stimulation of ATP hydrolysis by its Hsp40 cochaperone, dissociates faster from a substrate in fold-competent conformations than from one in misfolding-prone conformations, thus elevating the native concentration above and suppressing the misfolded concentration below their respective equilibrium values...
September 4, 2018: Scientific Reports
Nathan M Rowarth, Thomas H MacRae
Embryos of the crustacean, Artemia franciscana , develop either ovoviviparously or oviparously, respectively yielding swimming larvae (nauplii) or encysted gastrulae (cysts). Nauplii molt several times and become adults whereas cysts enter diapause, a state of dormancy characterized by exceptionally low metabolism and high stress tolerance. Synthesis of molecular chaperones such as the J-domain proteins, ArHsp40 and ArHsp40-2 occurs during embryo development and post-diapause growth of A. franciscana and they influence development and stress tolerance...
August 29, 2018: Journal of Experimental Biology
Preethi T Cherian, Irina Al-Khairi, Devarajan Sriraman, Ahmad Al-Enezi, Dalal Al-Sultan, Mohammed AlOtaibi, Saad Al-Enezi, Jaakko Tuomilehto, Fahd Al-Mulla, Jehad A Abubaker, Mohamed Abu-Farha
Heat shock response is an essential cellular stress response. Dysregulation of various heat shock proteins (HSPs), within the heat shock response (HSR) pathway, play a vital role in this host-defense mechanism contributing to obesity-induced insulin resistance and type 2 diabetes (T2D). Previously, we have reported changes in the expression levels of several HSPs such as HSP40, HSP60, HSP70, and HSP90 in obese compared with lean individuals. DNAJC27 is a member of the HSP40 protein family that was previously identified as a body mass index (BMI) associated locus in genome-wide association (GWAS) studies...
2018: Frontiers in Endocrinology
Cristina Fernández, Rafael Giraldo
The accumulation of aggregated forms of proteins as toxic species is associated with fatal diseases such as amyloid proteinopathies. With the purpose of deconstructing the molecular mechanisms of these type of diseases through a Synthetic Biology approach, we are working with a model bacterial prion-like protein, RepA-WH1, expressed in a cell-free system. Our findings show that the Hsp70 chaperone from Escherichia coli, together with its Hsp40 and nucleotide exchange factor cochaperones, modulates the aggregation of the prion-like protein in the cell-free system...
September 21, 2018: ACS Synthetic Biology
Gabriel Silva, Mozart Marins, Nadda Chaichanasak, Yongdae Yoon, Ana Lúcia Fachin, Vitor Caressato Pinhanelli, Luis Octávio Regasini, Mariana Bastos Dos Santos, Gabriela Miranda Ayusso, Beatriz de Carvalho Marques, Wells W Wu, Je-Nie Phue, Rong-Fong Shen, Seung Joon Baek
Naturally-occurring chalcones and synthetic chalcone analogues have been demonstrated to have many biological effects, including anti-inflammatory, anti-malarial, anti-fungal, and anti-oxidant/anti-cancerous activities. Compared to other chalcones, trans-chalcone exhibits superior inhibitory activity in cancer cell growth as shown via in vitro assays, and exerts anti-cancerous effects via the activation of the p53 tumor suppressor protein. Thus, characterization of the specific mechanisms, by which trans-chalcone activates p53, can aid development of new chemotherapeutic drugs that can be used individually or synergistically with other drugs...
2018: PloS One
Peng-Cheng Li, Xue-Nan Li, Zheng-Hai Du, Hui Wang, Zhuo-Ran Yu, Jin-Long Li
Di (2-ethyl hexyl) phthalate (DEHP) as a plasticizer can leach away from the plastic and hence entrances into the animal food chain which caused serious hazard in organs of animals, but there are few studies on DEHP kidney toxicity. The heat-shock response (HSR) consisting of the HSPs and HSFs plays an important role in various toxicity stress conditions. To investigate the influence on kidney toxicity and the modulation of HSR during DEHP exposure, female quail were fed the diet with 0, 250, 500 and 750 mg/kg DEHP by gavage administration for 45 days...
October 2018: Chemosphere
Esra Nurten Yer, Mehmet Cengiz Baloglu, Sezgin Ayan
Heat shock proteins (Hsps) play a key role for regulation of the changes during different stress conditions including salinity, drought, heavy metal and extreme temperature. Molecular based studies on the response mechanisms of forest trees to abiotic stresses started in 2006 when Populus trichocarpa genome sequence was completed as a model tree species. In recent years, bioinformatic analyzes have been carried out to determine functional gene regions of tree species. In this study, sHsp, Hsp40, Hsp60, Hsp90 and Hsp100 gene family members were identified in poplar genome...
December 15, 2018: Gene
Xuena Huang, Shiguo Li, Yangchun Gao, Aibin Zhan
Biological response to rapid changing environments is an outstanding research question in ecology and evolution. Biological invasions provide excellent "natural" experiments to study such a complex response process, as invaders often encounter rapidly changing environments during biological invasions. The regulation of heat shock proteins (Hsp) is a common pathway responsible for various environmental stresses; however, the comprehensive study on Hsp system across the whole genome and potential roles in determining invasion success are still largely unexplored...
2018: Frontiers in Physiology
Zheng-Gang Han, Ji-Wen Zhang, Xiao-Fang Jiang, Jiang-Ke Yang
The α-galactosidases, which can catalyze the removal of α-1,6-linked terminal galactose residues from galactooligosaccharide materials, have good potential for industrial applications. The high-level and efficient secretion of the α-galactosidases into the extracellular space has greatly simplified the downstream bioengineering process, facilitating their bioapplications. In this study, the effects of gene dosage and endoplasmic reticulum secretion-associated factors (ERSAs) on the secretory expression of an α-galactosidase gene derived from a Aspergillus oryzae strain were investigated by constructing multicopy expression cassettes and coexpressing the α-galactosidase gene with ERSAs...
August 11, 2018: Protein Expression and Purification
Yu-Syuan Chen, Ching-Wen Chang, Yeou-Guang Tsay, Liu-Ying Huang, Yi-Chen Wu, Li-Hao Cheng, Cheng-Chieh Yang, Cheng-Hsien Wu, Wan-Huai Teo, Kai-Feng Hung, Chih-Yang Huang, Te-Chang Lee, Jeng-Fan Lo
Human tumorous imaginal disc (Tid1), a DnaJ co-chaperone protein, is classified as a tumor suppressor. Previously, we demonstrated that Tid1 reduces head and neck squamous cell carcinoma (HNSCC) malignancy. However, the molecular details of Tid1-mediated anti-metastasis remain elusive. Methods: We used affinity chromatography and systemic mass spectrometry to identify Tid1-interacting client proteins. Immunohistochemical staining of Tid1 in HNSCC patient tissues was examined to evaluate the association between the expression profile of Tid1-interacting client proteins with pathologic features and prognosis...
2018: Theranostics
Jinqiang Huang, Yongjuan Li, Zhe Liu, Yujun Kang, Jianfu Wang
Rainbow trout (Oncorhynchus mykiss) are widely cultured throughout the word for commercial aquaculture. However, as a cold-water species, rainbow trout are highly susceptible to heat stress, which may cause pathological signs or diseases by alleviating the immune roles and then lead to mass mortality. Understanding the molecular mechanisms that occur in the rainbow trout in response to heat stress will be useful to decrease heat stress-related morbidity and mortality in trout aquaculture. In the present study, we conducted transcriptome analysis of head kidney tissue in rainbow trout under heat-stress (24 °C) and control (18 °C) conditions, to identify heat stress-induced genes and pathways...
August 2, 2018: Fish & Shellfish Immunology
Alexander Rebl, Marieke Verleih, Mareen Nipkow, Simone Altmann, Ralf Bochert, Tom Goldammer
The complex and still poorly understood nature of thermoregulation in various fish species complicates the determination of the physiological status on the basis of diagnostic marker genes and indicative molecular pathways. The present study aimed to compare the physiological impacts of both gradual and acute temperature rise from 18 to 24°C on maraena whitefish in aquaculture. Microarray-based transcriptome profiles in the liver, spleen and kidney of heat-stressed maraena whitefish revealed the modulation of a significantly higher number of genes in those groups exposed to gradually rising temperatures compared with the acutely stressed groups, which might reflect early adaptation mechanisms...
2018: Frontiers in Genetics
Juhyung Lee, Yue Xu, Ting Zhang, Lei Cui, Layla Saidi, Yihong Ye
In eukaryotic cells, elimination of misfolded proteins is essential for maintaining protein homeostasis and cell viability. Misfolding-associated protein secretion (MAPS) is a protein quality-control mechanism that exports misfolded cytosolic proteins via a compartment characteristic of late endosomes, but how cytosolic proteins enter this compartment is unclear. Because chaperone-mediated autophagy (CMA) is a known mechanism that imports cytosolic proteins bearing a specific CMA motif to lysosomes for degradation and because late endosomes and lysosomes overlap significantly in mammalian cells, we determined here whether CMA is involved in targeting protein cargoes to the lumen of late endosomes in MAPS...
September 14, 2018: Journal of Biological Chemistry
Zhong-Yuan Li, Jing Lu, Nian-Zhang Zhang, Hany M Elsheikha, Jun-Ling Hou, Hai-Ting Guo, Xing-Quan Zhu
Toxoplasma gondii causes one of the most common protozoal diseases of humans and animals worldwide. With the aim of designing an effective vaccine against T. gondii infection, we examined the immunogenicity of a DNA vaccine expressing heat shock protein 40 (HSP40) against challenge with T. gondii (type I RH and type II Pru) strains in Kunming mice. The plasmid pVAX1-HSP40 was constructed and used to immunize mice by intramuscular injection for three sequential immunizations with two-week intervals. This immunization regimen significantly reduced parasite cyst burden in pVAX1-HSP40-immunized mice (1871...
2018: Parasite: Journal de la Société Française de Parasitologie
Tobias Jores, Jannis Lawatscheck, Viktor Beke, Mirita Franz-Wachtel, Kaori Yunoki, Julia C Fitzgerald, Boris Macek, Toshiya Endo, Hubert Kalbacher, Johannes Buchner, Doron Rapaport
Mitochondrial β-barrel proteins are encoded in the nucleus, translated by cytosolic ribosomes, and then imported into the organelle. Recently, a detailed understanding of the intramitochondrial import pathway of β-barrel proteins was obtained. In contrast, it is still completely unclear how newly synthesized β-barrel proteins reach the mitochondrial surface in an import-competent conformation. In this study, we show that cytosolic Hsp70 chaperones and their Hsp40 cochaperones Ydj1 and Sis1 interact with newly synthesized β-barrel proteins...
September 3, 2018: Journal of Cell Biology
Brigitte Picard, Mohammed Gagaoua, Marwa Al-Jammas, Leanne De Koning, Albéric Valais, Muriel Bonnet
Tenderness and intramuscular fat content are key attributes for beef sensory qualities. Recently some proteomic analysis revealed several proteins which are considered as good biomarkers of these quality traits. This study focuses on the analysis of 20 of these proteins representative of several biological functions: muscle structure and ultrastructure, muscle energetic metabolism, cellular stress and apoptosis. The relative abundance of the proteins was measured by Reverse Phase Protein Array (RPPA) in five muscles known to have different tenderness and intramuscular lipid contents: Longissimus thoracis (LT), Semimembranosus (SM), Rectus abdominis (RA), Triceps brachii (TB) and Semitendinosus (ST)...
2018: PeerJ
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