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https://www.readbyqxmd.com/read/28035601/epidemiological-relationships-of-campylobacter-jejuni-strains-isolated-from-humans-and-chickens-in-south-korea
#1
Jae-Young Oh, Yong-Kuk Kwon, Bai Wei, Hyung-Kwan Jang, Suk-Kyung Lim, Cheon-Hyeon Kim, Suk-Chan Jung, Min-Su Kang
Thirty-nine human isolates of Campylobacter jejuni obtained from a national university hospital during 2007-2010 and 38 chicken isolates of C. jejuni were collected from poultry farms during 2009-2010 in South Korea were used in this study. Campylobacter genomic species and virulence-associated genes were identified by PCR. Pulsed-field gel electrophoresis (PFGE) and multilocus sequence typing (MLST) were performed to compare their genetic relationships. All isolates were highly resistant to ciprofloxacin, nalidixic acid, and tetracycline...
January 2017: Journal of Microbiology / the Microbiological Society of Korea
https://www.readbyqxmd.com/read/28031292/protein-kinase-ck2-modulates-hsj1-function-through-phosphorylation-of-the-uim2-domain
#2
Daniele Ottaviani, Oriano Marin, Giorgio Arrigoni, Cinzia Franchin, Jordi Vilardell, Michele Sandre, Wenwen Li, David A Parfitt, Lorenzo A Pinna, Michael E Cheetham, Maria Ruzzene
HSJ1 (DNAJB2), a member of the DNAJ family of molecular chaperones, is a key player in neuronal proteostasis maintenance. It binds ubiquitylated proteins through its Ubiquitin Interacting Motifs (UIMs) and facilitates their delivery to the proteasome for degradation. Mutations in the DNAJB2 gene lead to inherited neuropathies such as Charcot-Marie-Tooth type-2, distal hereditary motor neuropathies, spinal muscular atrophy with parkinsonism and the later stages can resemble amyotrophic lateral sclerosis. HSJ1 overexpression can reduce aggregation of neurodegeneration-associated proteins in vitro and in vivo; however, the regulation of HSJ1 function is little understood...
December 28, 2016: Human Molecular Genetics
https://www.readbyqxmd.com/read/28018906/chaperonopathies-spotlight-on-hereditary-motor-neuropathies
#3
REVIEW
Vincenzo Lupo, Carmen Aguado, Erwin Knecht, Carmen Espinós
Distal hereditary motor neuropathies (dHMN) are a group of rare hereditary neuromuscular disorders characterized by an atrophy that affects peroneal muscles in the absence of sensory symptoms. To date, 23 genes are thought to be responsible for dHMN, four of which encode chaperones: DNAJB2, which encodes a member of the HSP40/DNAJ co-chaperone family; and HSPB1, HSPB3, and HSPB8, encoding three members of the small heat shock protein family. While around 30 different mutations in HSPB1 have been identified, the remaining three genes are altered in many fewer cases...
2016: Frontiers in Molecular Biosciences
https://www.readbyqxmd.com/read/28013030/interaction-of-e-coli-hsp90-with-dnak-involves-the-dnaj-binding-region-of-dnak
#4
Andrea N Kravats, Shannon M Doyle, Joel R Hoskins, Olivier Genest, Erin Doody, Sue Wickner
The 90-kDa heat shock protein (Hsp90) is a widely conserved and ubiquitous molecular chaperone that participates in ATP-dependent protein remodeling in both eukaryotes and prokaryotes. It functions in conjunction with Hsp70 and the Hsp70 cochaperones, an Hsp40 (J-protein) and a nucleotide exchange factor. In Escherichia coli, the functional collaboration between Hsp90Ec and Hsp70, DnaK, requires that the two chaperones directly interact. We used molecular docking to model the interaction of Hsp90Ec and DnaK...
December 21, 2016: Journal of Molecular Biology
https://www.readbyqxmd.com/read/28008672/the-angulata7-gene-encodes-a-dnaj-like-zinc-finger-domain-protein-involved-in-chloroplast-function-and-leaf-development-in-arabidopsis
#5
Tamara Muñoz-Nortes, José Manuel Pérez-Pérez, María Rosa Ponce, Héctor Candela, José Luis Micol
The characterization of mutants with altered leaf shape and pigmentation has previously allowed the identification of nuclear genes that encode plastid-localized proteins that perform essential functions in leaf growth and development. A large-scale screen previously allowed us to isolate ethyl methanesulfonate-induced mutants with small rosettes and pale green leaves with prominent marginal teeth, which were assigned to a phenotypic class that we dubbed Angulata. The molecular characterization of the twelve genes assigned to this phenotypic class should help us to advance our understanding of the still poorly understood relationship between chloroplast biogenesis and leaf morphogenesis...
December 23, 2016: Plant Journal: for Cell and Molecular Biology
https://www.readbyqxmd.com/read/28000841/genome-wide-association-scans-for-idiopathic-osteonecrosis-of-the-femoral-head-in-a-korean-population
#6
Seung-Hoon Baek, Kang-Il Kim, Kyung-Sik Yoon, Tae-Ho Kim, Shin-Yoon Kim
Osteonecrosis of the femoral head (ONFH) is a multifactorial disease and is associated with genetic predisposition, and exposure to certain risk factors. In particular, idiopathic ONFH in twins and the clustering of cases in families have indicated that genetic factors are involved. However, the majority of cases of ONFH are sporadic and various studies have demonstrated that differences in the study design and/or the ethnic groups analyzed leads to different results. The present study performed one of the first genome‑wide association studies to identify genetic loci that may increase the risk of idiopathic ONFH...
February 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/27984043/myeloid-leukemia-factor-acts-in-a-chaperone-complex-to-regulate-transcription-factor-stability-and-gene-expression
#7
Jamie O Dyer, Arnob Dutta, Madelaine Gogol, Vikki M Weake, George Dialynas, Xilan Wu, Christopher Seidel, Ying Zhang, Laurence Florens, Michael P Washburn, Susan M Abmayr, Jerry L Workman
Mutations that affect Myeloid Leukemia Factor (MLF) proteins are associated with leukemia and several other cancers. However, with no strong homology to other proteins of known function, the role of MLF proteins in the cell has remained elusive. Here we describe a proteomics approach that identifies MLF as a member of a nuclear chaperone complex containing a DnaJ protein, BAG2 and Hsc70. This complex associates with chromatin and regulates expression of target genes. The MLF complex is bound to sites of nucleosome depletion and sites containing active chromatin marks (e...
October 27, 2016: Journal of Molecular Biology
https://www.readbyqxmd.com/read/27966599/transcriptional-analysis-of-degenerate-strain-clostridium-beijerinckii-dg-8052-reveals-a-pleiotropic-response-to-caco3-associated-recovery-of-solvent-production
#8
Shengyin Jiao, Yan Zhang, Caixia Wan, Jia Lv, Renjia Du, Ruijuan Zhang, Bei Han
Degenerate Clostridium beijerinckii strain (DG-8052) can be partially recovered by supplementing CaCO3 to fermentation media. Genome resequencing of DG-8052 showed no general regulator mutated. This study focused on transcriptional analysis of DG-8052 and its response to CaCO3 treatment via microarray. The expressions of 5168 genes capturing 98.6% of C. beijerinckii NCIMB 8052 genome were examed. The results revealed that with addition of CaCO3 565 and 916 genes were significantly up-regulated, and 704 and 1044 genes significantly down-regulated at acidogenic and solventogenic phase of DG-8052, respectively...
December 14, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27966060/components-of-a-mammalian-protein-disaggregation-refolding-machine-are-targeted-to-nuclear-speckles-following-thermal-stress-in-differentiated-human-neuronal-cells
#9
Catherine A S Deane, Ian R Brown
Heat shock proteins (Hsps) are a set of highly conserved proteins involved in cellular repair and protective mechanisms. They counter protein misfolding and aggregation that are characteristic features of neurodegenerative diseases. Hsps act co-operatively in disaggregation/refolding machines that assemble at sites of protein misfolding and aggregation. Members of the DNAJ (Hsp40) family act as "holdases" that detect and bind misfolded proteins, while members of the HSPA (Hsp70) family act as "foldases" that refold proteins to biologically active states...
December 13, 2016: Cell Stress & Chaperones
https://www.readbyqxmd.com/read/27902286/macrococcus-canis-sp-nov-a-skin-bacterium-associated-with-infections-in-dogs
#10
Stefanie Gobeli Brawand, Kerstin Cotting, Elena Gómez-Sanz, Alexandra Collaud, Andreas Thomann, Isabelle Brodard, Sabrina Rodriguez Campos, Christian Strauss, Vincent Perreten
Gram-stain positive cocci were isolated from miscellaneous sites of the skin of healthy dogs as well as from infection sites in dogs. The closest relative by sequencing of the 16S rRNA was Macrococcus caseolyticus with 99.7% sequence identity, but compared to M. caseolyticus, the novel strains shared only 90.8% to 93.5% DNA identity to cpn60, dnaJ, rpoB, and sodA partial genes, respectively. The two species also exhibited other phenotypic characteristics and the majority displayed a visible haemolysis on sheep blood agar, while M...
November 16, 2016: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/27895727/deficiency-of-sumo-specific-protease-1-induces-arsenic-trioxide-mediated-apoptosis-by-regulating-xbp1-activity-in-human-acute-promyelocytic-leukemia
#11
Fei-Fei Wang, Ming-Zhu Liu, Yi Sui, Qing Cao, Bo Yan, Mei-Ling Jin, Xi Mo
Small ubiquitin-like modifier (SUMO)/sentrin-specific protease 1 (SENP1), a member of the SENP family, is highly expressed in several neoplastic tissues. However, the effect of SENP1 in acute promyelocytic leukemia (APL) has not been elucidated. In the present study, it was observed that SENP1 deficiency had no effect on the spontaneous apoptosis or differentiation of NB4 cells. Arsenic trioxide (As2O3) could induce the upregulation of endoplasmic reticulum (ER) stress, resulting in the apoptosis of NB4 cells...
November 2016: Oncology Letters
https://www.readbyqxmd.com/read/27872278/reconstitution-of-a-mycobacterium-tuberculosis-proteostasis-network-highlights-essential-cofactor-interactions-with-chaperone-dnak
#12
Tania J Lupoli, Allison Fay, Carolina Adura, Michael S Glickman, Carl F Nathan
During host infection, Mycobacterium tuberculosis (Mtb) encounters several types of stress that impair protein integrity, including reactive oxygen and nitrogen species and chemotherapy. The resulting protein aggregates can be resolved or degraded by molecular machinery conserved from bacteria to eukaryotes. Eukaryotic Hsp104/Hsp70 and their bacterial homologs ClpB/DnaK are ATP-powered chaperones that restore toxic protein aggregates to a native folded state. DnaK is essential in Mycobacterium smegmatis, and ClpB is involved in asymmetrically distributing damaged proteins during cell division as a mechanism of survival in Mtb, commending both proteins as potential drug targets...
December 6, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27829973/common-functions-of-the-chloroplast-and-mitochondrial-co-chaperones-cpdnajl-cdf1-and-mtdnaj-pam16-in-protein-import-and-ros-scavenging-in-arabidopsis-thaliana
#13
REVIEW
John Gray, Sachin Rustgi, Diter von Wettstein, Christiane Reinbothe, Steffen Reinbothe
As semi-autonomous cell organelles that contain only limited coding information in their own DNA, chloroplasts and mitochondria must import the vast majority of their protein constituents from the cytosol. Respective protein import machineries have been identified that mediate the uptake of chloroplast and mitochondrial proteins and interact with molecular chaperones of the HEAT-SHOCK PROTEIN (HSP) 70 family operating as import motors. Recent work identified unexpected new functions of 2 DnaJ co-chaperones in mitochondrial and chloroplast protein translocation and suggest a common mechanism of reactive oxygen species (ROS) scavenging that shall be discussed here...
2016: Communicative & Integrative Biology
https://www.readbyqxmd.com/read/27793689/phylogenetic-analysis-of-the-pathogenic-genus-aeromonas-spp-isolated-from-diseased-eels-in-china
#14
S L Guo, Q H Yang, J J Feng, L H Duan, J P Zhao
Analyses of 16S rRNA and housekeeping genes (HKGs) were valuated as identification markers for pathogenic Aeromonas isolated from diseased eels. The interrelationships of 32 Aeromonas strains which had been verified as pathogens to eels were studied using phylogenetic analysis with 16S rRNA and HKG sequences (cpn60, gyrB, rpoB and dnaJ) and identified by Biolog automatic microbiology analysis system (gene III). From the analysis of 5 genes, the mean gene divergences of 16S rRNA, cpn60, gyrB, rpoB and dnaJ in 32 isolates were 1...
December 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27771249/chromosome-mapping-molecular-cloning-and-expression-analysis-of-nal11-a-novel-heat-shock-dnaj-gene
#15
Yahui Wu, Lixin Luo, Likai Chen, Xingxing Tao, Ming Huang, Hui Wang, Zhiqiang Chen, Wuming Xiao
Genetic analysis revealed that narrow leaf, small panicle, thin and slender stems as well as low fertility rate of an Indica rice variety were recessive traits and controlled by a single gene. Applying map-based cloning strategy, a novel narrow leaf gene, which was named nal11 was delimited to an interval of 58.3 kb between the InDel markers N10 and InD5016. There are 9 genes in the mapping interval, and only a heat shock DNAJ protein encode gene (Os07g09450) has a specific G to T SNP, which was occurred at the last base of the second exon of Os07g09450 in ZYX...
October 19, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27713507/versatile-members-of-the-dnaj-family-show-hsp70-dependent-anti-aggregation-activity-on-ring1-mutant-parkin-c289g
#16
Vaishali Kakkar, E F Elsiena Kuiper, Abhinav Pandey, Ineke Braakman, Harm H Kampinga
Parkinson's disease is one of the most common neurodegenerative disorders and several mutations in different genes have been identified to contribute to the disease. A loss of function parkin RING1 domain mutant (C289G) is associated with autosomal-recessive juvenile-onset Parkinsonism (AR-JP) and displays altered solubility and sequesters into aggregates. Single overexpression of almost each individual member of the Hsp40 (DNAJ) family of chaperones efficiently reduces parkin C289G aggregation and requires interaction with and activity of endogenously expressed Hsp70 s...
October 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27642634/a-modifier-screen-identifies-dnajb6-as-a-cardiomyopathy-susceptibility-gene
#17
Yonghe Ding, Pamela A Long, J Martijn Bos, Yu-Huan Shih, Xiao Ma, Rhianna S Sundsbak, Jianhua Chen, Yiwen Jiang, Liqun Zhao, Xinyang Hu, Jianan Wang, Yongyong Shi, Michael J Ackerman, Xueying Lin, Stephen C Ekker, Margaret M Redfield, Timothy M Olson, Xiaolei Xu
Mutagenesis screening is a powerful forward genetic approach that has been successfully applied in lower-model organisms to discover genetic factors for biological processes. This phenotype-based approach has yet to be established in vertebrates for probing major human diseases, largely because of the complexity of colony management. Herein, we report a rapid strategy for identifying genetic modifiers of cardiomyopathy (CM). Based on the application of doxorubicin stress to zebrafish insertional cardiac (ZIC) mutants, we identified 4 candidate CM-modifying genes, of which 3 have been linked previously to CM...
September 8, 2016: JCI Insight
https://www.readbyqxmd.com/read/27626893/single-molecule-dynamics-of-the-molecular-chaperone-trigger-factor-in-living-cells
#18
Feng Yang, Tai-Yen Chen, Łukasz Krzemiński, Ace George Santiago, Won Jung, Peng Chen
In bacteria, trigger factor (TF) is the molecular chaperone that interacts with the ribosome to assist the folding of nascent polypeptides. Studies in vitro have provided insights into the function and mechanism of TF. Much is to be elucidated, however, about how TF functions in vivo. Here, we use single-molecule tracking, in combination with genetic manipulations, to study the dynamics and function of TF in living E. coli cells. We find that TF, besides interacting with the 70S ribosome, may also bind to ribosomal subunits and form TF-polypeptide complexes that may include DnaK/DnaJ proteins...
December 2016: Molecular Microbiology
https://www.readbyqxmd.com/read/27609015/the-altered-liver-microrna-profile-in-hepatotoxicity-induced-by-rhizome-dioscorea-bulbifera-in-mice
#19
Rui Yang, Qingyun Bai, Jiaqi Zhang, Yuchen Sheng, Lili Ji
MicroRNA (miRNA) has been reported to play important roles in regulating drug-induced liver injury. Ethyl acetate extract isolated from rhizoma Dioscoreae bulbifera (EF) has been reported to induce hepatotoxicity in our previous studies. This study aims to observe the altered liver miRNA profile and its related signalling pathway involved in EF-induced hepatotoxicity. Serum alanine/aspartate aminotransferase assay showed that EF (450 mg/kg)-induced hepatotoxicity in mice. Results of miRNA chip analysis showed that the expression of eight miRNAs was up-regulated and of other nine miRNAs was down-regulated in livers from EF-treated mice...
September 7, 2016: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/27599615/the-sav1322-gene-from-staphylococcus-aureus-genomic-and-proteomic-approaches-to-identification-and-characterization-of-gene-function
#20
Jung Wook Kim, Hyun-Kyung Kim, Gi Su Kang, Il-Hwan Kim, Hwa Su Kim, Yeong Seon Lee, Jae Il Yoo
BACKGROUND: Bacterial two-component regulatory systems (TCRS) are associated with the expression of virulence factors and antibiotic susceptibility. In Staphylococcus aureus, 16 TCRS types have been identified. The histidine kinase/response regulator SAV1321/SAV1322 in the S. aureus shares considerable homology with the TCRS DesKR in Bacillus subtilis. However, a function for the SAV1322 locus has not yet been assigned. RESULTS: Deletion of the SAV1322 locus in S...
September 6, 2016: BMC Microbiology
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