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https://www.readbyqxmd.com/read/28330235/antimicrobial-activities-of-a-promising-glycolipid-biosurfactant-from-a-novel-marine-staphylococcus-saprophyticus-sbps-15
#1
P Mani, G Dineshkumar, T Jayaseelan, K Deepalakshmi, C Ganesh Kumar, S Senthil Balan
Biosurfactants have gained a renewed interest in the recent years for their commercial application in diverse research areas. Recent evidences suggest that the antimicrobial activities exhibited by biosurfactants make them promising molecules for the application in the field of therapeutics. Marine microbes are well known for their unique metabolic and functional properties; however, few reports are available till date regarding their biosurfactant production and antimicrobial potential. In an ongoing survey for bioactive microbial metabolites from microbes isolated from diverse ecological niches, a marine Staphylococcus saprophyticus SBPS 15 isolated from the petroleum hydrocarbon contaminated coastal site, Puducherry, India, was identified as a promising biosurfactant producer based on multiple screening methods...
December 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330155/purification-and-characterization-of-rga2-a-rho2-gtpase-activating-protein-from-tinospora-cordifolia
#2
Mohd Amir, Mohammad Aasif Dar, Wahiduzzaman, Asimul Islam, Faizan Ahmad, Md Imtaiyaz Hassan
Rho GTPases activating protein 2 (RGA2) is primarily involved in the modulation of numerous morphological events in eukaryotes. It protects plants by triggering the defense system which restricts the pathogen growth. This is the first report on the isolation, purification and characterization of RGA2 from the stems of Tinospora cordifolia, a medicinal plant. The RGA2 was purified using simple two-step process using DEAE-Hi-Trap FF and Superdex 200 chromatography columns, with a high yield. The purity of RGA2 was confirmed by SDS-PAGE and identified by MALDI-TOF/MS...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330122/production-purification-and-characterization-of-a-thermotolerant-alkaline-serine-protease-from-a-novel-species-bacillus-caseinilyticus
#3
Thirumala Mothe, Vishnuvardhan Reddy Sultanpuram
Alkaline proteases are important enzymes in many industrial applications, especially as additives in laundry detergent industry. Though there are a number of Bacillus species which are reported to be producing proteases, the efficiency of a protease produced by a novel strain has to be studied in comparison to the others. Hence, in this study, an alkaline serine protease produced by a novel species Bacillus caseinilyticus was purified and characterized for its possible usage in detergent industry. Ammonium sulphate, dialysis and DEAE column chromatographic methods were used for purification of the isolated alkaline protease...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28330086/cloning-expression-purification-and-characterization-of-human-mitochondrial-carbonic-anhydrase-va
#4
Danish Idrees, Sudhir Kumar, Syed Abdul Arif Rehman, Samudrala Gourinath, Asimul Islam, Faizan Ahmad, Md Imtaiyaz Hassan
Carbonic anhydrase VA (CAVA) is a mitochondrial enzyme that catalyzes the reversible hydration of CO2 to produce HCO3(-) and proton. CAV is primarily involved in several biosynthetic processes such as ureagenesis, gluconeogenesis and lipogenesis by providing bicarbonate ion. Here, we report a new strategy for cloning, expression and purification for CAVA in the bacterial system followed by its biophysical characterization. The cDNA of CAVA, a 801 nucleotide long that encodes a 267-amino acid polypeptide of molecular mass of 30-kDa (excluding signal peptide), was sub-cloned in the expression vector pET21c and transformed into Escherichia coli strain BL21 (DE3) for expression...
June 2016: 3 Biotech
https://www.readbyqxmd.com/read/28328038/superbasic-alkyl-substituted-bisphosphazene-proton-sponges-a-new-class-of-deprotonating-matrices-for-negative-ion-matrix-assisted-ionization-laser-desorption-mass-spectrometry-of-low-molecular-weight-hardly-ionizable-analytes
#5
C D Calvano, T R I Cataldi, J F Kögel, A Monopoli, F Palmisano, J Sundermeyer
RATIONALE: Here hardly ionizable and low molecular weight compounds are detected in negative ion mode by using novel superbasic proton sponges based on 1,8-bisphosphazenylnaphthalene (PN) as MALDI matrices. Among the selected proton sponges, 1,8-bis(trispyrrolidinophosphazenyl)naphthalene (TPPN) has shown the best behaviour as matrix since it allows the direct detection of intact cholesterol without derivatization also in real challenging samples. METHODS: Very weakly acidic compounds such as sterols, steroids, fatty alcohols and saccharides were detected in reflectron negative ion mode by a MALDI TOF/TOF system equipped with a neodymium-doped yttrium lithium fluoride (Nd:YLF) laser (345 nm) with typical mass accuracy of 10 ppm...
July 30, 2016: Rapid Communications in Mass Spectrometry: RCM
https://www.readbyqxmd.com/read/28327300/rbaltmip-a-recombinant-alpha-type-myotoxin-inhibitor-from-bothrops-alternatus-rhinocerophis-alternatus-snake-as-a-potential-candidate-to-complement-the-antivenom-therapy
#6
Norival A Santos-Filho, Tiago S Sousa, Johara Boldrini-França, Ludier K Santos-Silva, Danilo L Menaldo, Flávio Henrique-Silva, Adélia C O Cintra, Helen J Laure, Carla C N Mamede, Fábio Oliveira, Thalita B Riul, Marcelo Dias-Baruffi, José C Rosa, Suely V Sampaio
Phospholipase A2 inhibitors (PLIs) are important targets in the search and development of new drugs. This study aimed at evaluating the potential of an alpha-type phospholipase A2 inhibitor from Bothrops alternatus (Rhinocerophis alternatus) snake in its recombinant form (rBaltMIP) to complement the conventional antivenom therapy. Biochemical experiments showed that rBaltMIP presented pI 5.8 and molecular masses of ∼21 kDa by SDS-PAGE and 19.57 kDa by MALDI/TOF MS. After tryptic peptides sequencing, the results were compared with other PLIs available in databases, showing 100% identity between rBaltMIP and its native inhibitor BaltMIP and from 92% to 96% identity with other inhibitors...
December 15, 2016: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/28326685/hugonella-massiliensis-gen-nov-sp-nov-genome-sequence-and-description-of-a-new-strictly-anaerobic-bacterium-isolated-from-the-human-gut
#7
Ziena Elsawi, Amadou Hamidou Togo, Mamadou Beye, Grégory Dubourg, Claudia Andrieu, Nicholas Armsrtong, Magali Richez, Fabrizio di Pinto, Fadi Bittar, Noémie Labas, Pierre-Edouard Fournier, Didier Raoult, Saber Khelaifia
The human gut is composed of a large diversity of microorganisms, which have been poorly described. Here, using culturomics, a new concept based on the variation in culture conditions and MALDI-TOF MS identification, we proceed to explore the microbial diversity of the complex ecosystem of the human gut. Using this approach, we isolated strain AT8(T) (=CSUR P2118 =  DSM 101782) from stool specimens collected from a 51-year-old obese French woman. Strain AT8(T) is a strictly anaerobic, nonmotile, nonspore-forming gram-positive coccus that do not exhibit catalase and oxidase activities...
March 21, 2017: MicrobiologyOpen
https://www.readbyqxmd.com/read/28326061/come-an-essential-response-regulator-negatively-regulates-the-expression-of-the-capsular-polysaccharide-locus-and-attenuates-the-bacterial-virulence-in-streptococcus-pneumoniae
#8
Yuqiang Zheng, Xuemei Zhang, Xiaofang Wang, Libin Wang, Jinghui Zhang, Yibing Yin
The capsular polysaccharide (CPS) of Streptococcus pneumoniae is the main virulence factors required for effective colonization and invasive disease. The capacity to regulate CPS production at the transcriptional level is critical for the survival of S. pneumoniae in different host niches, but little is known about the transcription regulators of cps locus. In the present study, we isolated and identified the response regulator ComE, the master competence switch in transformation of S. pneumoniae, as a transcriptional regulator of cps locus by DNA affinity chromatography-pulldown, MALDI-TOF mass spectrometry (MS) and electrophoretic mobility shift assay (EMSA)...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28325940/one-pot-synthesis-of-four-coordinate-boron-iii-complexes-by-the-ligand-promoted-organic-group-migration-between-boronic-acids
#9
Venkata S Sadu, Hye-Rin Bin, Do-Min Lee, Kee-In Lee
Multidisciplinary applications of four-coordinate boron(III) complexes make them very attractive and challenging research field in chemistry, biology and material sciences. The dual role played by boron atom in stabilising the chelate ligand and enhancing the π-conjugation makes them very useful as luminescent materials for organic electronics and photonics, and sensing and imaging probes for biomedical purposes. The conventional methods involve the use of diarylborinic acids or anhydrides and triaryl boranes, which are made from organometallic reagents...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28320881/lpto-pg0027-is-required-for-lipid-a-1-phosphatase-activity-in-porphyromonas-gingivalis-w50
#10
Minnie Rangarajan, Joseph Aduse-Opoku, Ahmed Hashim, Graham McPhail, Zofia Luklinska, M Florencia Haurat, Mario F Feldman, Michael A Curtis
Porphyromonas gingivalis produces outer-membrane vesicles (OMVs) rich in virulence factors including cysteine-proteases and A-LPS, one of the two lipopolysaccharides (LPS) produced by this organism. Previous studies had suggested that A-LPS together with PG0027, an outer-membrane (OM) protein, may be involved in OMV-formation. Their roles in this process were examined using parent W50 and mutant ΔPG0027 strains. Inactivation of PG0027 caused a reduction in yield of OMVs. Lipid A from cells and OMVs of P. gingivalis W50 and ΔPG0027 strains were analysed by matrix-assisted laser-desorption-ionisation-time of flight mass spectrometry (MALDI-TOF- MS)...
March 20, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28319745/characteristics-and-proteomic-analysis-of-pyrene-degradation-by-brevibacillus-brevis-in-liquid-medium
#11
Kun Wei, Hua Yin, Hui Peng, Zehua Liu, Guining Lu, Zhi Dang
Polycyclic aromatic hydrocarbons (PAHs) are widely spread in various ecosystems and are of great concern due to their potential toxicity, mutagenicity and carcinogenicity. Bioremediation has been proposed as an effective approach to remove PAHs. In this study, the physiological responses and proteome of Brevibacillus brevis under exposure to pyrene, a four-ring compound from PAHs family, were investigated. The changes of cell viability of B. brevis were observed during the degradation of pyrene by means of flow cytometry...
March 14, 2017: Chemosphere
https://www.readbyqxmd.com/read/28318563/characterization-of-enterococcus-species-isolated-from-marine-recreational-waters-by-maldi-tof-ms-and-rapid-id-api%C3%A2-20-strep-system
#12
Ana Paula Guarnieri Christ, Solange Rodrigues Ramos, Rodrigo Cayô, Ana Cristina Gales, Elayse Maria Hachich, Maria Inês Zanoli Sato
MALDI-TOF Mass Spectrometry Biotyping has proven to be a reliable method for identifying bacteria at the species level based on the analysis of the ribosomal proteins mass fingerprint. We evaluate the usefulness of this method to identify Enterococcus species isolated from marine recreational water at Brazilian beaches. A total of 127 Enterococcus spp. isolates were identified to species level by bioMérieux's API® 20 Strep and MALDI-TOF systems. The biochemical test identified 117/127 isolates (92%), whereas MALDI identified 100% of the isolates, with an agreement of 63% between the methods...
March 17, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28318230/label-free-discovery-array-platform-for-the-characterization-of-glycan-binding-proteins-and-glycoproteins
#13
Christopher John Gray, Antonio Sánchez-Ruiz, Ivana Šardzíková, Yassir A Ahmed, Rebecca Louise Miller, Juana E Reyes Martinez, Edward Pallister, Kun Huang, Peter Both, Mirja Hartmann, Hannah N Roberts, Robert Šardzik, Santanu Mandal, Jeremy E Turnbull, Claire E Eyers, Sabine L Flitsch
The identification of carbohydrate-protein interactions is central to our understanding of the roles of cell-surface carbohydrates (the glycocalyx), fundamental for cell-recognition events. Therefore there is a need for fast high-throughput biochemical tools to capture the complexity of these biological interactions. Here we describe a rapid method for qualitative label-free detection of carbohydrate-protein interactions on arrays of simple synthetic glycans, more com-plex natural glycosaminoglycans (GAG) and lectins/carbohydrate binding proteins using MALDI-ToF mass spectrometry...
March 20, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28317766/first-evidences-of-interaction-between-pyranoanthocyanins-and-salivary-proline-rich-proteins
#14
Ignacio García-Estévez, Luís Cruz, Joana Oliveira, Nuno Mateus, Victor de Freitas, Susana Soares
The contribution of other classes of polyphenol compounds besides tannins to the overall perception of astringency is still poorly understood. So, this work aimed to study the interaction between a family of salivary proline-rich proteins (aPRPs) and representative pyranoanthocyanins in red wines [pyranomalvidin-3-glucoside (vitisin B), pyranomalvidin-3-glucoside-catechol, and pyranomalvidin-3-glucoside-epicatechin] using saturation transfer difference-NMR and MALDI-TOF. For vitisin B KD was of 1.74mM; for pyranomalvidin-3-glucoside-catechol was 1...
August 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/28316631/potential-impact-of-rapid-blood-culture-testing-for-gram-positive-bacteremia-in-japan-with-the-verigene-gram-positive-blood-culture-test
#15
Ken Kikuchi, Mari Matsuda, Shigekazu Iguchi, Tomonori Mizutani, Keiichi Hiramatsu, Michiru Tega-Ishii, Kaori Sansaka, Kenta Negishi, Kimie Shimada, Jun Umemura, Shigeyuki Notake, Hideji Yanagisawa, Hiroshi Takahashi, Reiko Yabusaki, Hideki Araoka, Akiko Yoneyama
Background. Early detection of Gram-positive bacteremia and timely appropriate antimicrobial therapy are required for decreasing patient mortality. The purpose of our study was to evaluate the performance of the Verigene Gram-positive blood culture assay (BC-GP) in two special healthcare settings and determine the potential impact of rapid blood culture testing for Gram-positive bacteremia within the Japanese healthcare delivery system. Furthermore, the study included simulated blood cultures, which included a library of well-characterized methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci (VRE) isolates reflecting different geographical regions in Japan...
2017: Canadian Journal of Infectious Diseases & Medical Microbiology
https://www.readbyqxmd.com/read/28306235/gcib-tof-sims-high-resolution-imaging-of-cardiolipin-speciation-in-the-brain-identification-of-molecular-losses-after-traumatic-injury
#16
Hua Tian, Louis J Sparvero, Andrew A Amoscato, Anna Bloom, Hulya Bayir, Valerian E Kagan, Nicholas Winograd
Gas cluster ion beam secondary ion mass spectrometry (GCIB-SIMS) has shown the full potential of mapping intact lipids in biological systems with better than 10 µm lateral resolution. This study investigated further the capability of GCIB-SIMS in imaging high-mass signals from intact cardiolipin (CL) and gangliosides in normal brain and the effect of a controlled cortical impact model (CCI) of traumatic brain injury (TBI) on their distribution. A combination of enzymatic and chemical treatments was employed to suppress the signals from the most abundant phospholipids (phosphatidylcholine (PC) and phosphatidylethanolamine (PE)) and enhance the signals from the low abundance CLs and gangliosides to allow their GCIB-SIMS detection at 8 and 16 µm spatial resolution...
March 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28303824/matrix-assisted-laser-desorption-ionisation-time-of-flight-mass-spectrometry-rapid-detection-of-carbapenamase-activity-in-acinetobacter-baumannii-isolates
#17
Noha Abouseada, May Raouf, Eman El-Attar, Pacinte Moez
INTRODUCTION: Carbapenamase-producing Acinetobacter baumannii are an increasing threat in hospitals and Intensive Care Units. Accurate and rapid detection of carbapenamase producers has a great impact on patient improvement and aids in implementation of infection control measures. AIM: In this study, we describe the use of matrix-assisted laser desorption ionisation time-of-flight mass spectrometry (MALDI TOF MS) to identify carbapenamase-producing A. baumannii isolates in up to 3 h...
January 2017: Indian Journal of Medical Microbiology
https://www.readbyqxmd.com/read/28303121/identification-of-lama-glama-as-reservoirs-for-acinetobacter-lwoffii
#18
Martín M Ledesma, Ailén M Díaz, Claudia Barberis, Carlos Vay, Marcela A Manghi, Juliana Leoni, Marisa S Castro, Alejandro Ferrari
South American Camelids have an increasing relevance in local economies, worldwide. These animals are bred for their meat, fur and as companion and therapy animals. Thus, their sanitary status should be well-established. According to the OIE (World Organization for Animal Health), respiratory infections mainly produced by Pasteurella spp. have been reported for camelids. It has been stated that this microorganism causes a mild disease, although many authors report it is an important cause of mortality among alpacas...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28302216/-association-of-indoor-air-pollution-single-nucleotide-polymorphism-of-hif-1%C3%AE-gene-with-susceptibility-to-lung-cancer-in-han-population-in-fujian-province
#19
Fei He, Qi Qi, Xu Li, Rendong Xiao, Qiuping Xu, Weimin Xiong, Zhiqiang Liu, Lin Cai
BACKGROUND: Hypoxia inducible factor-1α (HIF-1α) is associated with the progression and metastasis of lung cancer. There are, however, few studies on the relationship between the single nucleotide polymorphisms of HIF-1α and susceptibility to lung cancer. Therefore, we aimed to investigate the relationship between indoor air pollution, HIF-1α rs2057482, and the susceptibility to primary lung cancer of the Fujian Han population. METHODS: The present study is a hospital-based case-control study...
March 20, 2017: Zhongguo Fei Ai za Zhi, Chinese Journal of Lung Cancer
https://www.readbyqxmd.com/read/28300263/size-specific-emission-in-peptide-capped-gold-quantum-clusters-with-tunable-photoswitching-behavior
#20
Abhishek Baral, Kingshuk Basu, Sirshendu Ghosh, Kalishankar Bhattacharyya, Subhasish Roy, Ayan Datta, Arindam Banerjee
Three different types of fluorescent gold clusters (namely blue, green and red emitting) have been prepared from a gold precursor (chloroauric acid) under moderate conditions in aqueous medium. A cysteine containing dipeptide has been used for the formation of these quantum clusters as this peptide molecule contains a thiol group in the side chain to cap these nascently formed clusters and the free amino and carboxylic moieties assist in water solubility. Thus, the clusters are also environmentally friendly as the capped peptide is made up of only naturally occurring protein amino acids...
March 16, 2017: Nanoscale
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