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Ali Akgul, Ayfer Akgul, Mark L Lawrence, Attila Karsi
Edwardsiella ictaluri is a Gram-negative facultative anaerobic rod and the causative agent of enteric septicemia of channel catfish (ESC), which is one of the most prevalent diseases of catfish, causing significant economic losses in the catfish industry. E. ictaluri is resistant to complement system and macrophage killing, which results in rapid systemic septicemia. However, mechanisms of E. ictaluri stress responses under conditions of host environment are not studied well. Therefore, in this work, we report E...
2018: PloS One
Lal Sangpuii, Sunil Kumar Dixit, Manoj Kumawat, Shekhar Apoorva, Mukesh Kumar, Deepthi Kappala, Tapas Kumar Goswami, Manish Mahawar
By assisting in the proteolysis, disaggregation and refolding of the aggregated proteins, Caseinolytic proteases (Clps) enhance the cellular survival under stress conditions. In the current study, comparative roles of two such Clps, ClpA (involved in proteolysis) and ClpB (involved in protein disaggregation and refolding) in the survival of Salmonella Typhimurium (S. Typhimurium) under different stresses and in virulence have been investigated. clpA and clpB gene deletion mutant strains (∆clpA and ∆clpB) of S...
March 14, 2018: Scientific Reports
Esther Frohnmeyer, Paulina Deptula, Tuula A Nyman, Pia K S Laine, Helena Vihinen, Lars Paulin, Petri Auvinen, Eija Jokitalo, Vieno Piironen, Pekka Varmanen, Kirsi Savijoki
This study compared the secretomes (proteins exported out of the cell) of Propionibacterium freudenreichii of different origin to identify plausible adaptation factors. Phylosecretomics indicated strain-specific variation in secretion of adhesins/invasins (SlpA, InlA), cell-wall hydrolysing (NlpC60 peptidase, transglycosylase), protective (RpfB) and moonlighting (DnaK, GroEL, GaPDH, IDH, ENO, ClpB) enzymes and/or proteins. Detailed secretome comparison suggested that one of the cereal strains (JS14) released a tip fimbrillin (FimB) in to the extracellular milieu, which was in line with the electron microscopy and genomic analyses, indicating the lack of surface-associated fimbrial-like structures, predicting a mutated type-2 fimbrial gene cluster (fimB-fimA-srtC2) and production of anchorless FimB...
February 28, 2018: Microbial Biotechnology
Emanuel Clauss-Lendzian, Ankita Vaishampayan, Anne de Jong, Uwe Landau, Carsten Meyer, Jan Kok, Elisabeth Grohmann
Emerging antibiotic resistance among pathogenic bacteria, paired with their ability to form biofilms on medical and technical devices, represents a serious problem for effective and long-term decontamination in health-care environments and gives rise to an urgent need for new antimicrobial materials. Here we present the impact of AGXX® , a novel broad-spectrum antimicrobial surface coating consisting of micro-galvanic elements formed by silver and ruthenium, on the transcriptome of Enterococcus faecalis. A clinical E...
March 2018: Microbiological Research
Anne Cybelle Pinto Gomide, Pablo Gomes de Sá, Ana Lidia Queiroz Cavalcante, Thiago de Jesus Sousa, Lucas Gabriel Rodrigues Gomes, Rommel Thiago Juca Ramos, Vasco Azevedo, Artur Silva, Adriana Ribeiro Carneiro Folador
Transcriptome studies on Corynebacterium pseudotuberculosis have recently contributed to the understanding about this microorganism's survival mechanisms in various hostile conditions. The gene expression profile of the C. pseudotuberculosis strain 1002 (Ovis biovar), has revealed genes that are possible candidates responsible for its maintenance in adverse environments, such as those found in the host. In another strain of this bacterium, 258 (Equi biovar), a high temperature condition was simulated, in order to verify which genes are responsible for promoting the persistence of the bacterium in these conditions, since it tolerates temperatures higher than 40°C, despite being a mesophilic bacterium...
March 1, 2018: Gene
Shinuo Cao, Nali Du, Heming Chen, Yu Pang, Zhaoxia Zhang, Jun Zheng, Honglin Jia
Caseinolytic peptidase B (ClpB) plays a pivotal role in suppressing and reversing protein aggregation. Toxoplasma gondii is an intracellular parasitic protozoan that infects a wide variety of mammals and birds and therefore is exposed to a broad range of living condition. We screened ToxoDB ( and identified 10 putative T. gondii genes encoding members of the Clp superfamily of caseinolytic proteases and chaperones. Of these, we focused on characterizing the Class I ATP-dependent molecular chaperones TgClpB1, TgClpB2, and TgClpB3...
October 17, 2017: Oncotarget
Elisabeth O Lampe, Carl Zingmark, Julia I Tandberg, Ida Marie P Thrane, Espen Brudal, Anders Sjöstedt, Hanne C Winther-Larsen
BACKGROUND: Francisella noatunensis ssp. noatunensis (F.n.n.) is the causative agent of francisellosis in Atlantic cod and constitutes one of the main challenges for future aquaculture on this species. A facultative intracellular bacterium like F.n.n. exert an immunologic challenge against which live attenuated vaccines in general are most effective. Thus, we constructed a deletion in the F.n.n. clpB gene as ΔclpB mutants are among the most promising vaccine candidates in human pathogenic Francisella...
December 19, 2017: Vaccine
Mark Rütgers, Ligia Segatto Muranaka, Timo Mühlhaus, Frederik Sommer, Sylvia Thoms, Juliane Schurig, Felix Willmund, Miriam Schulz-Raffelt, Michael Schroda
We have identified 39 proteins that interact directly or indirectly with high confidence with chloroplast HSP22E/F under heat stress thus revealing chloroplast processes affected by heat. Under conditions promoting protein unfolding, small heat shock proteins (sHsps) prevent the irreversible aggregation of unfolding proteins by integrating into forming aggregates. Aggregates containing sHsps facilitate the access of Hsp70 and ClpB/Hsp104 chaperones, which in ATP-dependent reactions disentangle individual proteins from the aggregates and assist in their refolding to the native state...
December 2017: Plant Molecular Biology
Woo Bin Park, Young Bin Im, Shim Soojin, Han Sang Yoo
Brucella abortus is a bacterium that causes brucellosis and is the causative agent of worldwide zoonosis. Pathogenesis of the Brucella abortus infection is so complicates. Thus, several researches have made to solve mechanism in infection of Brucella abortus. While several proteins are revealed as the pathogenic factors by previous researches, underlying mechanism of the Brucella abortus infection is still left to be resolved. We identify the proteins showing the different expression level in Brucella abortus mutants with different biological characteristics that generated by random insertion of transposon...
October 13, 2017: Journal of Veterinary Science
S O Fetissov, Romain Legrand, Nicolas Lucas
Background Specific peptide molecules classified as hormones, neuropeptides and cytokines are involved in intercellular signaling regulating various physiological processes in all organs and tissues. This justifies the peptidergic signaling as an attractive pharmacological target. Recently, a protein mimetic of a peptide hormone has been identified in Escherichia coli suggesting the potential use of specific bacterial proteins as a new type of peptide-like drugs. Objective This paper describes the scientific rational and the technological approach leading to the identification of the E...
October 5, 2017: Current Medicinal Chemistry
Shuang Liu, Nan Wu, Shanshan Zhang, Youhua Yuan, Wenhong Zhang, Ying Zhang
Persisters comprise a group of phenotypically heterogeneous metabolically quiescent bacteria with multidrug tolerance and contribute to the recalcitrance of chronic infections. Although recent work has shown that toxin-antitoxin (TA) system HipAB depends on stringent response effector (p)ppGppin persister formation, whether other persister pathways are also dependent on stringent response has not been explored. Here we examined the relationship of (p)ppGpp with 15 common persister genes (dnaK, clpB, rpoS, pspF, tnaA, sucB, ssrA, smpB, recA, umuD, uvrA, hipA, mqsR, relE, dinJ) using Escherichia coli as a model...
2017: Frontiers in Microbiology
David I Walker, Jonathan McQuillan, Michael Taiwo, Rachel Parks, Craig A Stenton, Hywel Morgan, Matthew C Mowlem, David N Lees
The presence of Escherichia coli in environmental waters is considered as evidence of faecal contamination and is therefore commonly used as an indicator in both water quality and food safety analysis. The long period of time between sample collection and obtaining results from existing culture based methods means that contamination events may already impact public health by the time they are detected. The adoption of molecular based methods for E. coli could significantly reduce the time to detection. A new quantitative real-time PCR (qPCR) assay was developed to detect the ybbW gene sequence, which was found to be 100% exclusive and inclusive (specific and sensitive) for E...
December 1, 2017: Water Research
Josielle Abrahão, David Z Mokry, Carlos H I Ramos
ATPases associated with diverse cellular activities (AAA+) form a superfamily of proteins involved in a variety of functions and are characterized by the presence of an ATPase module containing two conserved motifs known as Walker A and Walker B. ClpB and Hsp104, chaperones that have disaggregase activities, are members of a subset of this superfamily, known as the AAA family, and are characterized by the presence of a second highly conserved motif, known as the second region of homology (SRH). Hsp104 and its homolog Hsp78 (78 kDa heat shock protein) are representatives of the Clp family in yeast...
2017: Frontiers in Molecular Biosciences
Janthima Methaneethorn, Duangchit Panomvana, Thaveechai Vachirayonstien
BACKGROUND: Therapeutic drug monitoring is essential for both phenytoin and phenobarbital therapy given their narrow therapeutic indexes. Nevertheless, the measurement of either phenytoin or phenobarbital concentrations might not be available in some rural hospitals. Information assisting individualized phenytoin and phenobarbital combination therapy is important. This study's objective was to determine the relationship between the maximum rate of metabolism of phenytoin (Vmax) and phenobarbital clearance (CLPB), which can serve as a guide to individualized drug therapy...
September 26, 2017: Drug Metabolism and Personalized Therapy
Sayaka Hayashi, Yosuke Nakazaki, Kei Kagii, Hiromi Imamura, Yo-Hei Watanabe
ClpB, a bacterial Hsp100, is a ring-shaped AAA+ chaperone that can reactivate aggregated proteins in cooperation with DnaK, a bacterial Hsp70, and its co-factors. ClpB subunits comprise two AAA+ modules with an interstitial rod-shaped M-domain. The M-domain regulates ClpB ATPase activity and interacts directly with the DnaK nucleotide-binding domain (NBD). Here, to clarify how these functions contribute to the disaggregation process, we constructed ClpB, DnaK, and aggregated YFP fusion proteins in various combinations...
August 17, 2017: Scientific Reports
Célia Deville, Marta Carroni, Kamila B Franke, Maya Topf, Bernd Bukau, Axel Mogk, Helen R Saibil
Refolding aggregated proteins is essential in combating cellular proteotoxic stress. Together with Hsp70, Hsp100 chaperones, including Escherichia coli ClpB, form a powerful disaggregation machine that threads aggregated polypeptides through the central pore of tandem adenosine triphosphatase (ATPase) rings. To visualize protein disaggregation, we determined cryo-electron microscopy structures of inactive and substrate-bound ClpB in the presence of adenosine 5'-O-(3-thiotriphosphate), revealing closed AAA+ rings with a pronounced seam...
August 2017: Science Advances
Congcong Cai, Yifan Yang, Pui W Kong
INTRODUCTION: This single-blind randomized trial was conducted to compare the treatment effect of lower limb (LL) exercises versus conventional lumbar extensor (LE) and lumbar stabilization (LS) exercises in recreational runners with chronic low back pain (cLBP), because there is currently no specific protocol for managing runners with cLBP. METHODS: Eighty-four recreational runners with cLBP were allocated to three exercise groups (LL, LE, LS) for an 8-wk intervention...
December 2017: Medicine and Science in Sports and Exercise
Shengli Chen, Huafang Hao, Ping Zhao, François Thiaucourt, Ying He, Pengcheng Gao, Han Guo, Wenheng Ji, Zhanhui Wang, Zhongxin Lu, Yuefeng Chu, Yongsheng Liu
Mycoplasma capricolum subsp. capripneumoniae (Mccp) is a common pathogen of goats that causes contagious caprine pleuropneumonia. We closed the gap and corrected rRNA operons in the draft genome of Mccp M1601: a strain isolated from an infected goat in a farm in Gansu, China. The genome size of M1601 is 1,016,707 bp with a GC content of 23.67%. We identified 915 genes (occupying 90.27% of the genome), of which 713 are protein-coding genes (excluding 163 pseudogenes). No genomic islands and complete insertion sequences were found in the genome...
September 7, 2017: G3: Genes—Genomes—Genetics
Joanna Krajewska, Anna Modrak-Wójcik, Zbigniew J Arent, Daniel Więckowski, Michal Zolkiewski, Agnieszka Bzowska, Sabina Kędzierska-Mieszkowska
Leptospira interrogans is a spirochaete responsible for leptospirosis in mammals. The molecular mechanisms of the Leptospira virulence remain mostly unknown. Recently, it has been demonstrated that an AAA+ chaperone ClpB (a member of the Hsp100 family) from L. interrogans (ClpBLi) is not only essential for survival of Leptospira under the thermal and oxidative stresses, but also during infection of a host. The aim of this study was to provide further insight into the role of ClpB in the pathogenic spirochaetes and explore its biochemical properties...
2017: PloS One
Kirti Mittal, Vanessa F Gonçalves, Ricardo Harripaul, Ari B Cuperfain, Brandi Rollins, Arun K Tiwari, Clement C Zai, Malgorzata Maciukiewicz, Daniel J Müller, Marquis P Vawter, James L Kennedy
Antipsychotic Induced Weight Gain (AIWG) is a common and severe side effect of many antipsychotic medications. Mitochondria play a vital role for whole-body energy homeostasis and there is increasing evidence that antipsychotics modulate mitochondrial function. This study aimed to examine the role of variants in nuclear-encoded mitochondrial genes and the mitochondrial DNA (mtDNA) in conferring risk for AIWG. We selected 168 European-Caucasian individuals from the CATIE sample based upon meeting criteria of multiple weight measures while taking selected antipsychotics (risperidone, quetiapine or olanzapine)...
September 2017: Schizophrenia Research
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