keyword
MENU ▼
Read by QxMD icon Read
search

Chaperones

keyword
https://www.readbyqxmd.com/read/28732045/the-exported-chaperone-hsp70-x-supports-virulence-functions-for-plasmodium-falciparum-blood-stage-parasites
#1
Sarah C Charnaud, Matthew W A Dixon, Catherine Q Nie, Lia Chappell, Paul R Sanders, Thomas Nebl, Eric Hanssen, Matthew Berriman, Jo-Anne Chan, Adam J Blanch, James G Beeson, Julian C Rayner, Jude M Przyborski, Leann Tilley, Brendan S Crabb, Paul R Gilson
Malaria is caused by five different Plasmodium spp. in humans each of which modifies the host erythrocyte to survive and replicate. The two main causes of malaria, P. falciparum and P. vivax, differ in their ability to cause severe disease, mainly due to differences in the cytoadhesion of infected erythrocytes (IE) in the microvasculature. Cytoadhesion of P. falciparum in the brain leads to a large number of deaths each year and is a consequence of exported parasite proteins, some of which modify the erythrocyte cytoskeleton while others such as PfEMP1 project onto the erythrocyte surface where they bind to endothelial cells...
2017: PloS One
https://www.readbyqxmd.com/read/28731464/trophoblast-survival-signaling-during-human-placentation-requires-hsp70-activation-of-mmp2-mediated-hbegf-shedding
#2
Chandni V Jain, Philip Jessmon, Charbel T Barrak, Alan D Bolnick, Brian A Kilburn, Michael Hertz, D Randall Armant
Survival of trophoblast cells in the low oxygen environment of human placentation requires metalloproteinase-mediated shedding of HBEGF and downstream signaling. A matrix metalloproteinase (MMP) antibody array and quantitative RT-PCR revealed upregulation of MMP2 post-transcriptionally in human first trimester HTR-8/SVneo trophoblast cells and placental villous explants exposed to 2% O2. Specific MMP inhibitors established the requirement for MMP2 in HBEGF shedding and upregulation. Because α-amanitin inhibited the upregulation of HBEGF, differentially expressed genes were identified by next-generation sequencing of RNA from trophoblast cells cultured at 2% O2 for 0, 1, 2 and 4 h...
July 21, 2017: Cell Death and Differentiation
https://www.readbyqxmd.com/read/28731225/decreased-levels-of-pdi-and-p5-in-oligodendrocytes-in-alzheimer-s-disease
#3
Yasuyuki Honjo, Takashi Ayaki, Takami Tomiyama, Tomohisa Horibe, Hidefumi Ito, Hiroshi Mori, Ryosuke Takahashi, Koji Kawakami
Protein disulfide isomerase (PDI) is a chaperone protein located in the endoplasmic reticulum (ER). Nitric oxide-induced S-nitrosylation of PDI inhibits its enzymatic activity, leading to protein accumulation and activation of the unfolded protein response. Protein disulfide isomerase P5 (P5) is a member of the PDI family that mostly localizes to the ER lumen. Both S-nitrosylated PDI and S-nitrosylated P5 are found in Alzheimer's disease (AD) brain. Previously, we showed that expression of the ER stress marker, growth arrest, and DNA damage protein (GADD34) was significantly increased in neurons and oligodendrocytes in AD brain...
July 21, 2017: Neuropathology: Official Journal of the Japanese Society of Neuropathology
https://www.readbyqxmd.com/read/28729925/patterns-of-production-of-collagen-rich-deposits-in-peripheral-nerves-in-response-to-injury-a-pilot-study-in-a-rabbit-model
#4
Michael Rivlin, Andrew Miller, Jacob Tulipan, Pedro K Beredjiklian, Mark L Wang, Jolanta Fertala, Andrzej Steplewski, James Kostas, Andrzej Fertala
INTRODUCTION: Although collagen-rich deposits are the main component of neural scars, the patterns of their formation are ill defined. Essential to the biosynthesis of collagen fibrils are enzymes catalyzing posttranslational modifications and chaperones that control the formation of the collagen triple helix. Prolyl-4-hydroxylase (P4H) and heat shock protein-47 (HSP47) play a key role, and their production is upregulated during scar formation in human tissues. Alpha smooth muscle actin (αSMA) is also produced during fibrotic processes in myofibroblasts that participate in fibrotic response...
July 2017: Brain and Behavior
https://www.readbyqxmd.com/read/28729823/administration-of-tauroursodeoxycholic-acid-attenuates-early-brain-injury-via-akt-pathway-activation
#5
Dongdong Sun, Gang Gu, Jianhao Wang, Yan Chai, Yueshan Fan, Mengchen Yang, Xin Xu, Weiwei Gao, Fei Li, Dongpei Yin, Shuai Zhou, Xin Chen, Jianning Zhang
Traumatic brain injury (TBI) is one of the leading causes of trauma-induced mortality and disability, and emerging studies have shown that endoplasmic reticulum (ER) stress plays an important role in the pathophysiology of TBI. Tauroursodeoxycholic acid (TUDCA), a hydrophilic bile acid, has been reported to act as an ER stress inhibitor and chemical chaperone and to have the potential to attenuate apoptosis and inflammation. To study the effects of TUDCA on brain injury, we subjected mice to TBI with a controlled cortical impact (CCI) device...
2017: Frontiers in Cellular Neuroscience
https://www.readbyqxmd.com/read/28727232/functional-genomic-analysis-of-corals-from-natural-co2-seeps-reveals-core-molecular-responses-involved-in-acclimatization-to-ocean-acidification
#6
C D Kenkel, A Moya, J Strahl, C Humphrey, L K Bay
Little is known about the potential for acclimatization or adaptation of corals to ocean acidification and even less about the molecular mechanisms underpinning these processes. Here we examine global gene expression patterns in corals and their intracellular algal symbionts from two replicate population pairs in Papua New Guinea that have undergone long-term acclimatization to natural variation in pCO2 . In the coral host, only 61 genes were differentially expressed in response to pCO2 environment, but the pattern of change was highly consistent between replicate populations, likely reflecting the core expression homeostasis response to ocean acidification...
July 20, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28725646/histone-chaperone-in-regulation-of-cellular-metabolism-dictating-stem-cell-fate
#7
EDITORIAL
Debasree Dutta
No abstract text is available yet for this article.
2017: Stem Cell Investigation
https://www.readbyqxmd.com/read/28724966/acetylation-induced-tdp-43-pathology-is-suppressed-by-an-hsf1-dependent-chaperone-program
#8
Ping Wang, Connor M Wander, Chao-Xing Yuan, Michael S Bereman, Todd J Cohen
TDP-43 pathology marks a spectrum of multisystem proteinopathies including amyotrophic lateral sclerosis, frontotemporal lobar degeneration, and sporadic inclusion body myositis. Surprisingly, it has been challenging to recapitulate this pathology, highlighting an incomplete understanding of TDP-43 regulatory mechanisms. Here we provide evidence supporting TDP-43 acetylation as a trigger for disease pathology. Using cultured cells and mouse skeletal muscle, we show that TDP-43 acetylation-mimics promote TDP-43 phosphorylation and ubiquitination, perturb mitochondria, and initiate degenerative inflammatory responses that resemble sporadic inclusion body myositis pathology...
July 19, 2017: Nature Communications
https://www.readbyqxmd.com/read/28724898/improvement-in-the-production-of-the-human-recombinant-enzyme-n-acetylgalactosamine-6-sulfatase-rhgalns-in-escherichia-coli-using-synthetic-biology-approaches
#9
Luis H Reyes, Carolina Cardona, Luisa Pimentel, Alexander Rodríguez-López, Carlos J Alméciga-Díaz
Previously, we demonstrated production of an active recombinant human N-acetylgalactosamine-6-sulfatase (rhGALNS) enzyme in Escherichia coli as a potential therapeutic alternative for mucopolysaccharidosis IVA. However, most of the rhGALNS produced was present as protein aggregates. Here, several methods were investigated to improve production and activity of rhGALNS. These methods involved the use of physiologically-regulated promoters and alternatives to improve protein folding including global stress responses (osmotic shock), overexpression of native chaperones, and enhancement of cytoplasmic disulfide bond formation...
July 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28724793/a-bag3-chaperone-complex-maintains-cardiomyocyte-function-during-proteotoxic-stress
#10
Luke M Judge, Juan A Perez-Bermejo, Annie Truong, Alexandre Js Ribeiro, Jennie C Yoo, Christina L Jensen, Mohammad A Mandegar, Nathaniel Huebsch, Robyn M Kaake, Po-Lin So, Deepak Srivastava, Beth L Pruitt, Nevan J Krogan, Bruce R Conklin
Molecular chaperones regulate quality control in the human proteome, pathways that have been implicated in many diseases, including heart failure. Mutations in the BAG3 gene, which encodes a co-chaperone protein, have been associated with heart failure due to both inherited and sporadic dilated cardiomyopathy. Familial BAG3 mutations are autosomal dominant and frequently cause truncation of the coding sequence, suggesting a heterozygous loss-of-function mechanism. However, heterozygous knockout of the murine BAG3 gene did not cause a detectable phenotype...
July 20, 2017: JCI Insight
https://www.readbyqxmd.com/read/28724440/bottleneck-in-secretion-of-%C3%AE-amylase-in-bacillus-subtilis
#11
REVIEW
Shaomin Yan, Guang Wu
Amylase plays an important role in biotechnology industries, and Gram-positive bacterium Bacillus subtilis is a major host to produce heterogeneous α-amylases. However, the secretion stress limits the high yield of α-amylase in B. subtilis although huge efforts have been made to address this secretion bottleneck. In this question-oriented review, every effort is made to answer the following questions, which look simple but are long-standing, through reviewing of literature: (1) Does α-amylase need a specific and dedicated chaperone? (2) What signal sequence does CsaA recognize? (3) Does CsaA require ATP for its operation? (4) Does an unfolded α-amylase is less soluble than a folded one? (5) Does α-amylase aggregate before transporting through Sec secretion system? (6) Is α-amylase sufficient stable to prevent itself from misfolding? (7) Does α-amylase need more disulfide bonds to be stabilized? (8) Which secretion system does PrsA pass through? (9) Is PrsA ATP-dependent? (10) Is PrsA reused after folding of α-amylase? (11) What is the fate of PrsA? (12) Is trigger factor (TF) ATP-dependent? The literature review suggests that not only the most of those questions are still open to answers but also it is necessary to calculate ATP budget in order to better understand how B...
July 19, 2017: Microbial Cell Factories
https://www.readbyqxmd.com/read/28724415/identification-and-characterization-of-the-antiplasmodial-activity-of-hsp90-inhibitors
#12
Claribel Murillo-Solano, Chunmin Dong, Cecilia G Sanchez, Juan C Pizarro
BACKGROUND: The recent reduction in mortality due to malaria is being threatened by the appearance of Plasmodium falciparum parasites that are resistant to artemisinin in Southeast Asia. To limit the impact of resistant parasites and their spread across the world, there is a need to validate anti-malarial drug targets and identify new leads that will serve as foundations for future drug development programmes targeting malaria. Towards that end, the antiplasmodial potential of several Hsp90 inhibitors was characterized...
July 19, 2017: Malaria Journal
https://www.readbyqxmd.com/read/28723972/correction-chaperone-mediated-autophagy-protein-bag3-negatively-regulates-ebola-and-marburg-vp40-mediated-egress
#13
Jingjing Liang, Cari A Sagum, Mark T Bedford, Sachdev S Sidhu, Marius Sudol, Ziying Han, Ronald N Harty
[This corrects the article DOI: 10.1371/journal.ppat.1006132.].
July 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28722533/an-hsp90-co-chaperone-controls-circadian-proteostasis
#14
Jeongsik Kim, David E Somers
No abstract text is available yet for this article.
July 19, 2017: Cell Cycle
https://www.readbyqxmd.com/read/28721857/stress-adaptation
#15
Alistair J P Brown, Leah E Cowen, Antonio di Pietro, Janet Quinn
Fungal species display an extraordinarily diverse range of lifestyles. Nevertheless, the survival of each species depends on its ability to sense and respond to changes in its natural environment. Environmental changes such as fluctuations in temperature, water balance or pH, or exposure to chemical insults such as reactive oxygen and nitrogen species exert stresses that perturb cellular homeostasis and cause molecular damage to the fungal cell. Consequently, fungi have evolved mechanisms to repair this damage, detoxify chemical insults, and restore cellular homeostasis...
July 2017: Microbiology Spectrum
https://www.readbyqxmd.com/read/28720827/small-chaperons-and-autophagy-protected-neurons-from-necrotic-cell-death
#16
Ye Lei, Kai Liu, Lin Hou, Lianggong Ding, Yuhong Li, Lei Liu
Neuronal necrosis occurs during early phase of ischemic insult. However, our knowledge of neuronal necrosis is still inadequate. To study the mechanism of neuronal necrosis, we previously established a Drosophila genetic model of neuronal necrosis by calcium overloading through expression of a constitutively opened cation channel mutant. Here, we performed further genetic screens and identified a suppressor of neuronal necrosis, CG17259, which encodes a seryl-tRNA synthetase. We found that loss-of-function (LOF) CG17259 activated eIF2α phosphorylation and subsequent up-regulation of chaperons (Hsp26 and Hsp27) and autophagy...
July 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28720726/mitochondrial-cochaperone-mge1-is-involved-in-regulating-susceptibility-to-fluconazole-in-saccharomyces-cerevisiae-and-candida-species
#17
Liesbeth Demuyser, Erwin Swinnen, Alessandro Fiori, Beatriz Herrera-Malaver, Kevin Vestrepen, Patrick Van Dijck
MGE1 encodes a yeast chaperone involved in Fe-S cluster metabolism and protein import into the mitochondria. In this study, we identified MGE1 as a multicopy suppressor of susceptibility to the antifungal fluconazole in the model yeast Saccharomyces cerevisiae We demonstrate that this phenomenon is not exclusively dependent on the integrity of the mitochondrial DNA or on the presence of the drug efflux pump Pdr5. Instead, we show that the increased dosage of Mge1 plays a protective role by retaining increased amounts of ergosterol upon fluconazole treatment...
July 18, 2017: MBio
https://www.readbyqxmd.com/read/28720498/rna-aptamers-targeted-for-human-%C3%AE-a-crystallin-do-not-bind-%C3%AE-b-crystallin-and-spare-the-%C3%AE-crystallin-domain
#18
Prabhat K Mallik, Hua Shi, Jayanti Pande
The molecular chaperones, α-crystallins, belong to the small heat shock protein (sHSP) family and prevent the aggregation and insolubilization of client proteins. Studies in vivo have shown that the chaperone activity of the α-crystallins is raised or lowered in various disease states. Therefore, the development of tools to control chaperone activity may provide avenues for therapeutic intervention, as well as enable a molecular understanding of chaperone function. The major human lens α-crystallins, αA- (HAA) and αB- (HAB), share 57% sequence identity and show similar activity towards some clients, but differing activities towards others...
July 15, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28720375/protective-role-of-antioxidant-compounds-against-peroxynitrite-mediated-modification-of-r54c-mutant-%C3%AE-a-crystallin
#19
Kazem Khoshaman, Reza Yousefi, Ali Akbar Moosavi-Movahedi
As a highly potent reactive oxygen and nitrogen species, peroxynitrite (PON) has endogenous production in the eye ball and contributes to a variety of ocular disorders. In the current study the structural characteristics, chaperone-like activity and conformational stability of R54C mutant αA-crystallin (αA-Cry) were studied upon modification with PON and in the presence of three antioxidant compounds such as ascorbic acid (ASA), glutathione (GSH) and N-acetylcysteine (NAC) using gel electrophoresis and different spectroscopy methods...
July 15, 2017: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/28718766/structural-insights-into-the-light-driven-auto-assembly-process-of-the-water-oxidizing-mn4cao5-cluster-in-photosystem-ii
#20
Miao Zhang, Martin Bommer, Ruchira Chatterjee, Rana Hussein, Junko Yano, Holger Dau, Jan Kern, Holger Dobbek, Athina Zouni
In plants, algae and cyanobacteria, Photosystem II (PSII) catalyzes the light-driven splitting of water at a protein-bound Mn4CaO5-cluster, the water-oxidizing complex (WOC). In the photosynthetic organisms, the light-driven formation of the WOC from dissolved metal ions is a key process because it is essential in both initial activation and continuous repair of PSII. Structural information is required for understanding of this chaperone-free metal-cluster assembly. For the first time, we obtained a structure of PSII from Thermosynechococcus elongatus without the Mn4CaO5-cluster...
July 18, 2017: ELife
keyword
keyword
33199
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"