keyword
MENU ▼
Read by QxMD icon Read
search

RecA

keyword
https://www.readbyqxmd.com/read/28639930/bradyrhizobium-mercantei-sp-nov-a-nitrogen-fixing-symbiont-isolated-from-nodules-of-deguelia-costata-syn-lonchocarpus-costatus
#1
Luisa Caroline Ferraz Helene, Jakeline Renata Marçon Delamuta, Renan Augusto Ribeiro, Mariangela Hungria
Some bacteria collectively known as rhizobia can establish symbiotic relationships and the N2-fixation process with several legumes used as green manure, in pastures and for wood production. Symbionts belonging to the genus Bradyrhizobium are predominant in the tropics, and an increasing number of studies report high genetic diversity within the genus. We performed a polyphasic study with two strains belonging to the genus Bradyrhizobium- SEMIA 6399T and SEMIA 6404-isolated from root nodules of Deguelia costata (syn...
June 22, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28633051/influence-of-lactic-acid-and-post-treatment-recovery-time-on-the-heat-resistance-of-listeria-monocytogenes
#2
Yasuo Omori, Kiyotaka Miake, Hiromi Nakamura, Eriko Kage-Nakadai, Yoshikazu Nishikawa
The aim of this study was to evaluate the effect of lactic acid (LA) with and without organic material at various post-treatment recovery times on the heat resistance of Listeria monocytogenes (Lm). LA decreased Lm numbers; however, the effect was remarkably attenuated by the presence of organic matter. Five strains of Lm were treated with LA and the listericidal effects were compared. The effect of LA varied depending on the strain, with ≥3.0% (w/w) LA required to kill the Lm strains in a short time. The heat resistance of Lm treated with LA was examined with respect to the time interval between the acid treatment and the subsequent manufacturing step...
June 12, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28629499/agrobacterium-salinitolerans-sp-nov-a-saline-alkaline-tolerant-bacterium-isolated-from-root-nodule-of-sesbania-cannabina
#3
Jun Yan, Yan Li, Hui Yan, Wen Feng Chen, Xiaoxia Zhang, En Tao Wang, Xiao Zeng Han, Zhi Hong Xie
Two Gram-staining-negative, aerobic bacteria (YIC 5082T and YIC4104) isolated from root nodules of Sesbania cannabina grown in a high-salt and alkaline environment were identified as a group in the genus Agrobacterium because they shared 100 and 99.7 % sequence similarities of 16S rRNA and recA+atpD genes, respectively. These two strains showed 99.2/100 % and 93.9/95.4 % 16S rRNA and recA+atpD gene sequence similarities to Agrobacterium radiobacter LMG140T and Agrobacterium. pusense NRCPB10T, respectively...
June 20, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28609744/a-whole-cell-bioreporter-assay-for-quantitative-genotoxicity-evaluation-of-environmental-samples
#4
Bo Jiang, Guanghe Li, Yi Xing, Dayi Zhang, Jianli Jia, Zhisong Cui, Xiao Luan, Hui Tang
Whole-cell bioreporters have emerged as promising tools for genotoxicity evaluation, due to their rapidity, cost-effectiveness, sensitivity and selectivity. In this study, a method for detecting genotoxicity in environmental samples was developed using the bioluminescent whole-cell bioreporter Escherichia coli recA::luxCDABE. To further test its performance in a real world scenario, the E. coli bioreporter was applied in two cases: i) soil samples collected from chromium(VI) contaminated sites; ii) crude oil contaminated seawater collected after the Jiaozhou Bay oil spill which occurred in 2013...
June 7, 2017: Chemosphere
https://www.readbyqxmd.com/read/28598309/reclassification-of-arthrobacter-viscosus-as-rhizobium-viscosum-comb-nov
#5
José David Flores-Félix, Martha Helena Ramírez-Bahena, Sergio Salazar, Alvaro Peix, Encarna Velázquez
The species Arthrobacter viscosus was isolated from soil from Guatemala and it was classified into the genus Arthrobacter on the basis of phenotypic traits. Nevertheless, the results of16S rRNA gene analysis indicated that this species is a member of the genus Rhizobium, with Rhizobium alamii GBV016T and Rhizobium mesosinicum CCBAU 25010T as the most closely related species with 99.64 and 99.48 % similarity, respectively. The similarity values for the recA gene are 92.2 and 94.4 % with respect to R. alamii GBV016T and R...
June 9, 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28595068/molecular-topology-a-new-strategy-for-antimicrobial-resistance-control
#6
Riccardo Zanni, Maria Galvez-Llompart, Jesus Machuca, Ramon Garcia-Domenech, Esther Recacha, Alvaro Pascual, Jose Manuel Rodriguez-Martinez, Jorge Galvez
The control of antimicrobial resistance (AMR) seems to have come to an impasse. The use and abuse of antibacterial drugs has had major consequences on the genetic mutability of both pathogenic and nonpathogenic microorganisms, leading to the development of new highly resistant strains. Because of the complexity of this situation, an in silico strategy based on QSAR molecular topology was devised to identify synthetic molecules as antimicrobial agents not susceptible to one or several mechanisms of resistance such as: biofilms formation (BF), ionophore (IA) activity, epimerase (EI) activity or SOS system (RecA inhibition)...
May 30, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28581924/dyella-lipolytica-sp-nov-a-lipolytic-bacterium-isolated-from-lower-subtropical-forest-soil
#7
Liang Tang, Mei-Hong Chen, Xi-Chen Nie, Meng-Ran Ma, Li-Hong Qiu
A Gram-stain-negative, aerobic, yellow-pigmented, non-spore-forming, non-motile, rod-shaped bacterium, designated strain DHOB07T, was isolated from a soil sample collected from the lower subtropical forest of the Dinghushan Biosphere Reserve, Guangdong Province, PR China (23° 10' N 112° 31' E). Strain DHOB07T grew at 10-37 °C, pH 4-7 and 0-0.5 % (w/v) NaCl, with an optimum at 28 °C, pH 5-5.5 and 0% (w/v) NaCl on R2A medium. Phylogenetic analyses based on 16S rRNA gene sequences showed that the strain formed a clade with Dyella jejuensis JP1T, Dyella nitratireducens DHG59T, Dyella koreensis BB4T, Dyella marensis CS5-B2Tand Dyellasoli JS12-10T, with sequence similarities of 98...
May 2017: International Journal of Systematic and Evolutionary Microbiology
https://www.readbyqxmd.com/read/28580923/the-crystal-structure-of-human-deah-box-rna-helicase-15-reveals-a-domain-organization-of-the-mammalian-deah-rha-family
#8
Karin Murakami, Kenji Nakano, Toshiyuki Shimizu, Umeharu Ohto
DEAH-box RNA helicase 15 (DHX15) plays important roles in RNA metabolism, including in splicing and in ribosome biogenesis. In addition, mammalian DHX15 also mediates the innate immune sensing of viral RNA. However, structural information on this protein is not available, although the structure of the fungal orthologue of this protein, Prp43, has been elucidated. Here, the crystal structure of the ADP-bound form of human DHX15 is reported at a resolution of 2.0 Å. This is the first structure to be revealed of a member of the mammalian DEAH-box RNA helicase (DEAH/RHA) family in a nearly complete form, including the catalytic core consisting of the two N-terminal RecA domains and the C-terminal regulatory domains (CTD)...
June 1, 2017: Acta Crystallographica. Section F, Structural Biology Communications
https://www.readbyqxmd.com/read/28573338/characterization-of-inducible-ccdb-gene-as-a-counterselectable-marker-in-escherichia-coli-recombineering
#9
Qing Zhang, Zhenya Yan, Yan Xu, Jian Sun, Guangdong Shang
Recombineering is a homologous-based DNA cloning and modification technique. Recombineering-mediated chromosomal gene knock-in usually involves a selectable/counterselectable cassette. Though a variety of selectable/counterselectable cassettes were developed; however, a specifically designed gene deletion strain or minimal medium is often required. Herein, we describe a novel selectable/counterselectable cassette Plac-ccdB-aacC1 in which aacC1 (gentamicin resistance gene) is used as the selectable marker for the homologous arm-flanked cassette knock-in, while the IPTG inducible ccdB gene is used as the counterselectable marker for chromosomal gene knock-in...
June 1, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28572319/complete-genome-sequence-of-escherichia-coli-blr-de3-a-reca-deficient-derivative-of-e-coli-bl21-de3
#10
Philippe Goffin, Philippe Dehottay
Escherichia coli BLR(DE3) is a commercially available recA-deficient derivative of BL21(DE3), one of the most widely used strains for recombinant protein expression. Here, we present the full-genome sequence of BLR(DE3) and highlight additional differences with its parent strain BL21(DE3) which were previously unreported but may affect its physiology.
June 1, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28561029/bacterial-rada-is-a-dnab-type-helicase-interacting-with-reca-to-promote-bidirectional-d-loop-extension
#11
Léa Marie, Chiara Rapisarda, Violette Morales, Mathieu Bergé, Thomas Perry, Anne-Lise Soulet, Clémence Gruget, Han Remaut, Rémi Fronzes, Patrice Polard
Homologous recombination (HR) is a central process of genome biology driven by a conserved recombinase, which catalyses the pairing of single-stranded DNA (ssDNA) with double-stranded DNA to generate a D-loop intermediate. Bacterial RadA is a conserved HR effector acting with RecA recombinase to promote ssDNA integration. The mechanism of this RadA-mediated assistance to RecA is unknown. Here, we report functional and structural analyses of RadA from the human pathogen Streptococcus pneumoniae. RadA is found to facilitate RecA-driven ssDNA recombination over long genomic distances during natural transformation...
May 31, 2017: Nature Communications
https://www.readbyqxmd.com/read/28551732/bradyrhizobium-brasilense-sp-nov-a-symbiotic-nitrogen-fixing-bacterium-isolated-from-brazilian-tropical-soils
#12
Elaine Martins da Costa, Amanda Azarias Guimarães, Rayssa Pereira Vicentin, Paula Rose de Almeida Ribeiro, Aniele Carolina Ribas Leão, Eduardo Balsanelli, Liesbeth Lebbe, Maarten Aerts, Anne Willems, Fatima Maria de Souza Moreira
Four strains of rhizobia isolated from nodules of Vigna unguiculata (UFLA03-321(T), UFLA03-320 and UFLA03-290) and Macroptilium atropurpureum (UFLA04-0212) in Brazilian soils were previously reported as a new group within the genus Bradyrhizobium. To determine their taxonomic position, these strains were characterized in this study using a polyphasic approach. The analysis of the 16S rRNA gene grouped the four strains with Bradyrhizobium pachyrhizi PAC48(T). However, the concatenated sequence analysis of the two (recA and glnII) or three (atpD, gyrB and recA) housekeeping genes indicated that these strains represent a novel species of Bradyrhizobium, which is very closely related to B...
May 27, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28542496/zinc-blocks-sos-induced-antibiotic-resistance-via-inhibition-of-reca-in-escherichia-coli
#13
Bryan E Bunnell, Jillian F Escobar, Kirsten L Bair, Mark D Sutton, John K Crane
Zinc inhibits the virulence of diarrheagenic E. coli by inducing the envelope stress response and inhibiting the SOS response. The SOS response is triggered by damage to bacterial DNA. In Shiga-toxigenic E. coli, the SOS response strongly induces the production of Shiga toxins (Stx) and of the bacteriophages that encode the Stx genes. In E. coli, induction of the SOS response is accompanied by a higher mutation rate, called the mutator response, caused by a shift to error-prone DNA polymerases when DNA damage is too severe to be repaired by canonical DNA polymerases...
2017: PloS One
https://www.readbyqxmd.com/read/28542203/correction-genome-functional-gene-annotation-and-nuclear-transformation-of-the-heterokont-oleaginous-alga-nannochloropsis-oceanica-ccmp1779
#14
Astrid Vieler, Guangxi Wu, Chia-Hong Tsai, Blair Bullard, Adam J Cornish, Christopher Harvey, Ida-Barbara Reca, Chelsea Thornburg, Rujira Achawanantakun, Christopher J Buehl, Michael S Campbell, David Cavalier, Kevin L Childs, Teresa J Clark, Rahul Deshpande, Erika Erickson, Ann Armenia Ferguson, Witawas Handee, Que Kong, Xiaobo Li, Bensheng Liu, Steven Lundback, Cheng Peng, Rebecca L Roston, Sanjaya, Jeffrey P Simpson, Allan TerBush, Jaruswan Warakanont, Simone Zäuner, Eva M Farre, Eric L Hegg, Ning Jiang, Min-Hao Kuo, Yan Lu, Krishna K Niyogi, John Ohlrogge, Katherine W Osteryoung, Yair Shachar-Hill, Barbara B Sears, Yanni Sun, Hideki Takahashi, Mark Yandell, Shin-Han Shiu, Christoph Benning
[This corrects the article DOI: 10.1371/journal.pgen.1003064.].
May 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28536148/the-lotus-domain-is-a-conserved-dead-box-rna-helicase-regulator-essential-for-the-recruitment-of-vasa-to-the-germ-plasm-and-nuage
#15
Mandy Jeske, Christoph W Müller, Anne Ephrussi
DEAD-box RNA helicases play important roles in a wide range of metabolic processes. Regulatory proteins can stimulate or block the activity of DEAD-box helicases. Here, we show that LOTUS (Limkain, Oskar, and Tudor containing proteins 5 and 7) domains present in the germline proteins Oskar, TDRD5 (Tudor domain-containing 5), and TDRD7 bind and stimulate the germline-specific DEAD-box RNA helicase Vasa. Our crystal structure of the LOTUS domain of Oskar in complex with the C-terminal RecA-like domain of Vasa reveals that the LOTUS domain occupies a surface on a DEAD-box helicase not implicated previously in the regulation of the enzyme's activity...
May 1, 2017: Genes & Development
https://www.readbyqxmd.com/read/28532268/allergen-immunotherapy-in-allergic-rhinitis-current-use-and-future-trends
#16
Ludger Klimek, Oliver Pfaar, Jean Bousquet, Gabriela Senti, Thomas Kündig
Type-1 allergies are among the most chronic common diseases of humans. Allergen immunotherapy (AIT) is the only causative and disease-modifying treatment option besides allergen avoidance. Severe systemic adverse allergic reactions may be induced by every AIT treatment. Different approaches have been used to provide safer AIT preparations to lower or even totally overcome this risk. Areas covered: A structured literature recherche in Medline and Pubmed under inclusion of national and international guidelines and Cochrane meta-analyses has been performed aiming at reviewing clinical use of such approaches in AIT...
June 15, 2017: Expert Review of Clinical Immunology
https://www.readbyqxmd.com/read/28527403/interplay-between-bacillus-subtilis-recd2-and-the-recg-or-ruvab-helicase-in-recombinational-repair
#17
Rubén Torres, Hector Romero, Violeta Rodríguez-Cerrato, Juan C Alonso
Bacillus subtilis AddAB, RecS, RecQ, PcrA, HelD, DinG, RecG, RuvAB, PriA and RecD2 are genuine recombinational repair enzymes, but the biological role of RecD2 is poorly defined. A ΔrecD2 mutation sensitizes cells to DNA-damaging agents that stall or collapse replication forks. We found that this ΔrecD2 mutation impaired growth, and that a mutation in the pcrA gene (pcrA596) relieved this phenotype. The ΔrecD2 mutation was not epistatic to ΔaddAB, ΔrecQ, ΔrecS, ΔhelD, pcrA596 and ΔdinG, but epistatic to recA...
May 12, 2017: DNA Repair
https://www.readbyqxmd.com/read/28526895/three-novel-xenorhabdus-steinernema-associations-and-evidence-of-strains-of-x-khoisanae-switching-between-different-clades
#18
Jonike Dreyer, Antoinette P Malan, Leon M T Dicks
Xenorhabdus species are normally closely associated with entomopathogenic nematodes of the family Steinernematidae. Strain F2, isolated from Steinernema nguyeni, was identified as Xenorhabdus bovienii and strains J194 and SB10, isolated from Steinernema jeffreyense and Steinernema sacchari as Xenorhabdus khoisanae, based on phenotypic characteristics and sequencing of 16S rRNA and housekeeping genes dnaN, gltX, gyrB, infB and recA. All three strains produced antimicrobial compounds that inhibited the growth of Gram-positive and Gram-negative bacteria...
May 19, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28515453/validation-of-reference-genes-for-the-normalization-of-the-rt-qpcr-gene-expression-of-virulence-genes-of-erwinia-amylovora-in-apple-shoots
#19
Monika Kałużna, Anita Kuras, Joanna Puławska
To study the expression of pathogenicity-related genes in Erwinia amylovora, seven candidate reference genes (ffh, glyA, gyrA, proC, pykA, recA, rpoB) were selected and validated with the following five different mathematic algorithms: geNorm, NormFinder, BestKeeper, the delta CT method and the RefFinder web-based tool. An overall comprehensive ranking output from each of the selected software programs revealed that proC and recA, followed by ffh and pykA, were the most stably expressed genes and can be recommended for the normalization of RT-qPCR data...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28515022/sos-response-in-bacteria-inhibitory-activity-of-lichen-secondary-metabolites-against-escherichia-coli-reca-protein
#20
Pierangelo Bellio, Letizia Di Pietro, Alisia Mancini, Marisa Piovano, Marcello Nicoletti, Fabrizia Brisdelli, Donatella Tondi, Laura Cendron, Nicola Franceschini, Gianfranco Amicosante, Mariagrazia Perilli, Giuseppe Celenza
BACKGROUND: RecA is a bacterial multifunctional protein essential to genetic recombination, error-prone replicative bypass of DNA damages and regulation of SOS response. The activation of bacterial SOS response is directly related to the development of intrinsic and/or acquired resistance to antimicrobials. Although recent studies directed towards RecA inactivation via ATP binding inhibition described a variety of micromolar affinity ligands, inhibitors of the DNA binding site are still unknown...
June 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
keyword
keyword
67789
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"