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https://www.readbyqxmd.com/read/29050876/comparative-genomic-analysis-of-clostridium-acetobutylicum-for-understanding-the-mutations-contributing-to-enhanced-butanol-tolerance-and-production
#1
Mengmeng Xu, Jingbo Zhao, Le Yu, Shang-Tian Yang
Clostridium acetobutylicum JB200 is a hyper butanol tolerant and producing strain obtained from asporogenic C. acetobutylicum ATCC 55025 through mutagenesis and adaptation in a fibrous bed bioreactor. The complete genomes of both strains were sequenced by the Illumina Hiseq2000 technology and assembled using SOAPdenovo approach. Compared to the genomic sequence of the type strain ATCC 824, 143 single nucleotide polymorphisms (SNPs) and 17 insertion/deletion variations (InDels) were identified in the genome of ATCC 55025...
October 16, 2017: Journal of Biotechnology
https://www.readbyqxmd.com/read/29038258/a-single-cell-view-of-the-btssr-ypdab-pyruvate-sensing-network-in-escherichia-coli-and-its-biological-relevance
#2
Cláudia Vilhena, Eugen Kaganovitch, Jae Yen Shin, Alexander Grünberger, Stefan Behr, Ivica Kristoficova, Sophie Brameyer, Dietrich Kohlheyer, Kirsten Jung
Fluctuating environments and individual physiological diversity force bacteria to constantly adapt and optimize the uptake of substrates. Here we focus on two very similar two-component systems (TCSs) of Escherichia coli belonging to the LytS/LytTR family, BtsS/BtsR (formerly YehU/YehT) and YpdA/YpdB. Both TCSs respond to extracellular pyruvate, albeit with different affinity, typically during post-exponential growth, and each system regulates expression of a single transporter gene, yjiY and yhjX, respectively...
October 16, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/29038253/conversion-of-norepinephrine-to-3-4-dihdroxymandelic-acid-in-escherichia-coli-requires-the-qsebc-quorum-sensing-system-and-the-fear-transcription-factor
#3
Sasikiran Pasupuleti, Nitesh Sule, Michael D Manson, Arul Jayaraman
The detection of norepinephrine (NE) as a chemoattractant by E. coli K-12 requires the combined action of the TynA monoamine oxidase and the FeaB aromatic aldehyde dehydrogenase. These role is to convert NE into 3,4-dihydroxymandelic acid (DHMA), which is a potent chemoattractant sensed by the Tsr chemoreceptor. These two enzymes must be induced by prior exposure to NE, and cells that exposed to NE for the first time initially show minimal chemotaxis toward it. The induction of TynA and FeaB requires the QseC quorum-sensing histidine kinase, and the signaling cascade requires new protein synthesis...
October 16, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/29035376/oncogenic-epstein-barr-virus-recruits-nm23-h1-to-regulate-chromatin-modifiers
#4
Saurabh Pandey, Erle S Robertson
In cancer progression, metastasis is a major cause of poor survival of patients and can be targeted for therapeutic interventions. The first discovered metastatic-suppressor Nm23-H1 possesses nucleoside diphosphate kinase, histidine kinase, and DNase activity as a broad-spectrum enzyme. Recent advances in cancer metastasis have opened new ways for the development of therapeutic molecular approaches. In this review, we provide a summary of the current understanding of Nm23/NDPKs in the context of viral oncogenesis...
October 16, 2017: Laboratory Investigation; a Journal of Technical Methods and Pathology
https://www.readbyqxmd.com/read/29018122/the-bvgas-regulon-of-bordetella-pertussis
#5
Kyung Moon, Richard P Bonocora, David D Kim, Qing Chen, Joseph T Wade, Scott Stibitz, Deborah M Hinton
Nearly all virulence factors in Bordetella pertussis are activated by a master two-component system, BvgAS, composed of the sensor kinase BvgS and the response regulator BvgA. When BvgS is active, BvgA is phosphorylated (BvgA~P), and virulence-activated genes (vags) are expressed [Bvg(+) mode]. When BvgS is inactive and BvgA is not phosphorylated, virulence-repressed genes (vrgs) are induced [Bvg(-) mode]. Here, we have used transcriptome sequencing (RNA-seq) and reverse transcription-quantitative PCR (RT-qPCR) to define the BvgAS-dependent regulon of B...
October 10, 2017: MBio
https://www.readbyqxmd.com/read/28994408/conformational-dynamics-of-the-essential-sensor-histidine-kinase-walk
#6
Yongfei Cai, Mingyang Su, Ashfaq Ahmad, Xiaojie Hu, Jiayan Sang, Lingyuan Kong, Xingqiang Chen, Chen Wang, Jianwei Shuai, Aidong Han
Two-component systems (TCSs) are key elements in bacterial signal transduction in response to environmental stresses. TCSs generally consist of sensor histidine kinases (SKs) and their cognate response regulators (RRs). Many SKs exhibit autokinase, phosphoryltransferase and phosphatase activities, which regulate RR activity through a phosphorylation and dephosphorylation cycle. However, how SKs perform different enzymatic activities is poorly understood. Here, several crystal structures of the minimal catalytic region of WalK, an essential SK from Lactobacillus plantarum that shares 60% sequence identity with its homologue VicK from Streptococcus mutans, are presented...
October 1, 2017: Acta Crystallographica. Section D, Structural Biology
https://www.readbyqxmd.com/read/28993850/expression-of-collagenase-is-regulated-by-the-vars-vara-two-component-regulatory-system-in-vibrio-alginolyticus
#7
Takehiko Mima, Kazuyoshi Gotoh, Yumiko Yamamoto, Keiko Maeda, Taku Shirakawa, Shunsuke Matsui, Yumi Murata, Takaki Koide, Hiroshi Tokumitsu, Osamu Matsushita
Vibrio alginolyticus is an opportunistic pathogen in both humans and marine animals. Collagenase encoded by colA is considered to be one of the virulence factors. Expression of colA is regulated by multiple environmental factors, e.g., temperature, growth phase, and substrate. To elucidate the mechanism of regulation of colA expression, transposon mutagenesis was performed. VarS, a sensor histidine kinase of the two-component regulatory system, was demonstrated to regulate the expression of colA. VarA, a cognate response regulator of VarS, was also identified and shown to be involved in the regulation of colA expression...
October 9, 2017: Journal of Membrane Biology
https://www.readbyqxmd.com/read/28979279/chase-containing-histidine-kinase-receptors-in-apple-tree-from-a-common-receptor-structure-to-divergent-cytokinin-binding-properties-and-specific-functions
#8
Dimitri Daudu, Elsa Allion, Franziska Liesecke, Nicolas Papon, Vincent Courdavault, Thomas Dugé de Bernonville, Céline Mélin, Audrey Oudin, Marc Clastre, Arnaud Lanoue, Martine Courtois, Olivier Pichon, David Giron, Sabine Carpin, Nathalie Giglioli-Guivarc'h, Joël Crèche, Sébastien Besseau, Gaëlle Glévarec
Cytokinin signaling is a key regulatory pathway of many aspects in plant development and environmental stresses. Herein, we initiated the identification and functional characterization of the five CHASE-containing histidine kinases (CHK) in the economically important Malus domestica species. These cytokinin receptors named MdCHK2, MdCHK3a/MdCHK3b, and MdCHK4a/MdCHK4b by homology with Arabidopsis AHK clearly displayed three distinct profiles. The three groups exhibited architectural variations, especially in the N-terminal part including the cytokinin sensing domain...
2017: Frontiers in Plant Science
https://www.readbyqxmd.com/read/28977726/target-dna-stabilizes-mycobacterium-tuberculosis-devr-dosr-phosphorylation-by-the-full-length-oxygen-sensors-devs-doss-and-dost
#9
Eduardo H S Sousa, Gonzalo Gonzalez, Marie-Alda Gilles-Gonzalez
Mycobacterium tuberculosis strongly relies on a latency, or nonreplicating persistence, to escape a human host's immune system. The DevR (DosR), DevS (DosS), and DosT proteins are key components of this process. Like the rhizobial FixL oxygen sensor, DevS and DosT are histidine protein kinases with a heme-binding domain. Like the FixJ partner and substrate of FixL, DevR is a classical response regulator of the two-component class. When activated by DevS or DosT during hypoxia in vivo, DevR induces a dormancy regulon of more than 40 genes...
October 4, 2017: FEBS Journal
https://www.readbyqxmd.com/read/28968488/a-crystal-structure-based-guide-to-the-design-of-human-histidine-triad-nucleotide-binding-protein-1-hhint1-activated-protides
#10
Kimberly M Maize, Rachit Shah, Alex Strom, Sidath C Kumarapperuma, Andrew Li Zhou, Carston R Wagner, Barry C Finzel
Nucleotide analogs that incorporate a metabolically labile nucleoside phosphoramidate (a ProTide) have found utility as prodrugs. In humans, ProTides can be cleaved by human histidine triad nucleotide binding protein 1 (hHint1) to expose the nucleotide monophosphate. Activation by this route circumvents highly selective nucleoside kinases that limit the use of nucleosides as prodrugs. To better understand the diversity of potential substrates of hHint1, we created and studied a series of phosphoramidate nucleosides...
October 2, 2017: Molecular Pharmaceutics
https://www.readbyqxmd.com/read/28942838/nucleoside-diphosphate-kinase-ndk-a-pleiotropic-effector-manipulating-bacterial-virulence-and-adaptive-responses
#11
REVIEW
Hua Yu, Xiancai Rao, Kebin Zhang
Nucleoside diphosphate kinase (Ndk) is a housekeeping enzyme that balances cellular nucleoside triphosphate (NTP) pools by catalyzing the reversible transfer of γ-phosphate from NTPs to nucleoside diphosphates (NDPs). In addition to its fundamental role in nucleotide metabolism, Ndk has roles in protein histidine phosphorylation, DNA cleavage/repair, and gene regulation. Recent studies have also revealed that Ndk secreted from bacteria is important in modulating virulence-associated phenotypes including quorum sensing regulation, type III secretion system activation, and virulence factor production...
December 2017: Microbiological Research
https://www.readbyqxmd.com/read/28933546/rational-design-of-selective-adenine-based-scaffolds-for-inactivation-of-bacterial-histidine-kinases
#12
Manibarsha Goswami, Kaelyn E Wilke, Erin E Carlson
Bacterial histidine kinases (HKs) are quintessential regulatory enzymes found ubiquitously in bacteria. Apart from their regulatory roles, they are also involved in the production of virulence factors and conferring resistance to various antibiotics in pathogenic microbes. We have previously reported compounds that inhibit multiple HKs by targeting the conserved catalytic and ATP-binding (CA) domain. Herein, we conduct a detailed structure-activity relationship assessment of adenine-based inhibitors using biochemical and docking methods...
October 3, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28933277/identification-of-an-interaction-between-a-histidine-kinase-response-regulator-hybrid-protein-and-2-keto-3-deoxy-d-manno-octulosonate-8-phosphate-synthase-in-gluconobacter-oxydans
#13
Cuijuan Yuan, Yangchen Lin, Yushu Ma, Dongzhi Wei
The histidine kinase response regulator hybrid protein was identified as a member of two-component signaling systems in Gluconobacter oxydans by gene annotation, but the function of this protein remains unknown. In this research, its specific interaction with a 2-keto-3-deoxy-D-manno-octulosonate-8-phosphate synthase was screened by yeast two-hybrid assay. The interaction between the two proteins was further identified by GST pull-down assay and bimolecular fluorescence complementation assay in vitro and in vivo, respectively...
September 19, 2017: Protein and Peptide Letters
https://www.readbyqxmd.com/read/28919888/the-sporothrix-schenckii-gene-encoding-for-the-ribosomal-protein-l6-has-constitutive-and-stable-expression-and-works-as-an-endogenous-control-in-gene-expression-analysis
#14
Elías Trujillo-Esquivel, José A Martínez-Álvarez, Diana M Clavijo-Giraldo, Nahúm V Hernández, Alberto Flores-Martínez, Patricia Ponce-Noyola, Héctor M Mora-Montes
Sporothrix schenckii is one of the causative agents of sporotrichosis, a worldwide-distributed mycosis that affects humans and other mammals. The interest in basic and clinical features of this organism has significantly increased in the last years, yet little progress in molecular aspects has been reported. Gene expression analysis is a set of powerful tools that helps to assess the cell response to changes in the extracellular environment, the genetic networks controlling metabolic pathways, and the adaptation to different growth conditions...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28911864/multiscale-approach-to-the-activation-and-phosphotransfer-mechanism-of-cpxa-histidine-kinase-reveals-a-tight-coupling-between-conformational-and-chemical-steps
#15
Franco Marsico, Osvaldo Burastero, Lucas A Defelipe, Elias Daniel Lopez, Mehrnoosh Arrar, Adrián G Turjanski, Marcelo A Marti
Sensor histidine kinases (SHKs) are an integral component of the molecular machinery that permits bacteria to adapt to widely changing environmental conditions. CpxA, an extensively studied SHK, is a multidomain homodimeric protein with each subunit consisting of a periplasmic sensor domain, a transmembrane domain, a signal-transducing HAMP domain, a dimerization and histidine phospho-acceptor sub-domain (DHp) and a catalytic and ATP-binding subdomain (CA). The key activation event involves the rearrangement of the HAMP-DHp helical core and translation of the CA towards the acceptor histidine, which presumably results in an autokinase-competent complex...
September 11, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28900144/structural-and-functional-insights-into-the-periplasmic-detector-domain-of-the-gacs-histidine-kinase-controlling-biofilm-formation-in-pseudomonas-aeruginosa
#16
Ahmad Ali-Ahmad, Firas Fadel, Corinne Sebban-Kreuzer, Moly Ba, Gauthier Dangla Pélissier, Olivier Bornet, Françoise Guerlesquin, Yves Bourne, Christophe Bordi, Florence Vincent
Pseudomonas aeruginosa is an opportunistic pathogenic bacterium responsible for both acute and chronic infections and has developed resistance mechanisms due to its ability to promote biofilm formation and evade host adaptive immune responses. Here, we investigate the functional role of the periplasmic detector domain (GacSPD) from the membrane-bound GacS histidine kinase, which is one of the key players for biofilm formation and coordination of bacterial lifestyles. A gacS mutant devoid of the periplasmic detector domain is severely defective in biofilm formation...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28874603/cancer-associated-arginine-to-histidine-mutations-confer-a-gain-in-ph-sensing-to-mutant-proteins
#17
Katharine A White, Diego Garrido Ruiz, Zachary A Szpiech, Nicolas B Strauli, Ryan D Hernandez, Matthew P Jacobson, Diane L Barber
The intracellular pH (pHi) of most cancers is constitutively higher than that of normal cells and enhances proliferation and cell survival. We found that increased pHi enabled the tumorigenic behaviors caused by somatic arginine-to-histidine mutations, which are frequent in cancer and confer pH sensing not seen with wild-type proteins. Experimentally raising the pHi increased the activity of R776H mutant epidermal growth factor receptor (EGFR-R776H), thereby increasing proliferation and causing transformation in fibroblasts...
September 5, 2017: Science Signaling
https://www.readbyqxmd.com/read/28860196/conformational-dynamics-as-a-key-factor-of-signaling-mediated-by-the-receiver-domain-of-sensor-histidine-kinase-from-arabidopsis-thaliana
#18
Olga Otrusinová, Gabriel Demo, Petr Padrta, Zuzana Jaseňáková, Blanka Pekárová, Zuzana Gelová, Agnieszka Szmitkowska, Pavel Kadeřávek, Séverine Jansen, Milan Zachrdla, Tomáš Klumpler, Jaromír Marek, Jozef Hritz, Lubomír Janda, Hideo Iwaï, Michaela Wimmerová, Jan Hejátko, Lukáš Žídek
Multistep phosphorelay (MSP) cascades mediate responses to a wide spectrum of stimuli, including plant hormonal signaling, but several aspects of MSP await elucidation. Here, we provide first insight into the key step of MSP-mediated phosphotransfer in a eukaryotic system, the phosphorylation of the receiver domain of the histidine kinase CYTOKININ INDEPENDENT 1 (CKI1RD) from Arabidopsis thaliana We observed that the crystal structures of free, Mg(2+)-bound, and beryllofluoridated CKI1RD (a stable analog of the labile phosphorylated form) were identical and similar to the active state of receiver domains of bacterial response regulators...
August 31, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28859293/impaired-calcium-homeostasis-is-associated-with-sudden-cardiac-death-and-arrhythmias-in-a-genetic-equivalent-mouse-model-of-the-human-hrc-ser96ala-variant
#19
Christos Tzimas, Daniel M Johnson, Demetrio J Santiago, Elizabeth Vafiadaki, Demetrios A Arvanitis, Constantinos H Davos, Aimilia Varela, Nikolaos C Athanasiadis, Constantinos Dimitriou, Michalis Katsimpoulas, Stephan Sonntag, Mariya Kryzhanovska, Doron Shmerling, Stephan E Lehnart, Karin R Sipido, Evangelia G Kranias, Despina Sanoudou
Aims: The histidine-rich calcium-binding protein (HRC) Ser96Ala variant has previously been identified as a potential biomarker for ventricular arrhythmias and sudden cardiac death in patients with idiopathic dilated cardiomyopathy. Herein, the role of this variant in cardiac pathophysiology is delineated through a novel mouse model, carrying the human mutation in the homologous mouse position. Methods and results: The mouse HRC serine 81, homologous to human HRC serine 96, was mutated to alanine, using knock-in gene targeting...
September 1, 2017: Cardiovascular Research
https://www.readbyqxmd.com/read/28839155/mapping-the-two-component-system-network-in-rice
#20
Ashutosh Sharan, Praveen Soni, Ramsong Chantre Nongpiur, Sneh L Singla-Pareek, Ashwani Pareek
Two-component system (TCS) in plants is a histidine to aspartate phosphorelay based signaling system. Rice genome has multifarious TCS signaling machinery comprising of 11 histidine kinases (OsHKs), 5 histidine phosphotransferases (OsHPTs) and 36 response regulators (OsRRs). However, how these TCS members interact with each other and comprehend diverse signaling cascades remains unmapped. Using a highly stringent yeast two-hybrid (Y2H) platform and extensive in planta bimolecular fluorescence complementation (BiFC) assays, distinct arrays of interaction between various TCS proteins have been identified in the present study...
August 24, 2017: Scientific Reports
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