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https://www.readbyqxmd.com/read/28636818/critical-temperature-of-1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine-monolayers-and-its-possible-biological-relevance
#1
Jordi Hernandez Borrell, Oscar Domenech
Since transmembrane proteins (TMPs) can be obtained with sufficient purity for x-ray diffraction studies more frequently than decades ago, their mechanisms of action may now be elucidated. One of the pending issues is the actual interplay between transmembrane proteins and membrane lipids. There is strong evidence of the involvement of specific lipids with some membrane proteins, such as the potassium crystallographically sited activation channel (KcsA) of Streptomyces lividans and the secondary transporter of lactose LacY of Escherichia coli, the activities of which are associated with the presence of anionic phospholipids such as the phosphatidylglycerol (PG) and phosphatidyethanolamine (PE), respectively...
June 21, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28634711/%C3%AE-pyrone-derivatives-from-a-streptomyces-strain-resensitize-tamoxifen-resistance-in-breast-cancer-cells
#2
Rui-Min Yang, Xiu-Lei Zhang, Li Wang, Jian-Ping Huang, Jing Yang, Yi-Jun Yan, Jian-Ying Luo, Xiang-Ting Wang, Sheng-Xiong Huang
Tamoxifen resistance (TamR) is the underlying cause of treatment failure in many breast cancer patients receiving tamoxifen. In order to look for noncytotoxic natural products with the ability to reverse TamR, an extract from strain Streptomyces sp. KIB-H0495 was detected to be active. Subsequent large scale fermentation and isolation led to the isolation of four α-pyrone derivatives including two new compounds, violapyrones J (2) and K (3), and two known analogues, violapyrones B (1) and I (4). Further bioactivity assays indicated that only 1 and 3 exerted potent resensitization effects on MCF-7/TamR cells at a concentration of 1 μM...
June 20, 2017: Natural Products and Bioprospecting
https://www.readbyqxmd.com/read/28634640/the-microbiome-of-eucalyptus-roots-under-different-management-conditions-and-its-potential-for-biological-nitrogen-fixation
#3
Eduardo da Siva Fonseca, Raquel Silva Peixoto, Alexandre Soares Rosado, Fabiano de Carvalho Balieiro, James M Tiedje, Caio Tavora Coelho da Costa Rachid
Eucalyptus plantations offer a cost-effective and renewable source of raw material. There is substantial interest in improving forestry production, especially through sustainable strategies such as the use of plant growth-promoting bacteria. However, little is known about Eucalyptus microbiology. In this study, the endophytic bacterial community was assessed in Eucalyptus urograndis roots using culture-dependent and culture-independent techniques with plants grown under different conditions. Three phyla accounted for approximately 95% of the community, with Actinobacteria corresponding to approximately 59%...
June 21, 2017: Microbial Ecology
https://www.readbyqxmd.com/read/28634080/nong-a-constituent-of-the-nonactin-biosynthetic-gene-cluster-regulates-nocardamine-synthesis-in-streptomyces-albus-j1074
#4
Wanki Park, Jung-Kyun Woo, Jongheon Shin, Ki-Bong Oh
Many factors regulate the expression of specialised secondary metabolite biosynthetic gene clusters, which have been recognised as important for the discovery of novel microbial natural products. A cosmid library based on genomic DNA of the marine-derived Streptomyces puniceus Act1085 was constructed and screened to identify a short gene cluster similar to the nonactin biosynthetic cluster. The ORFs of the gene cluster isolated had high amino acid sequence identity, from 82% to 96%, with corresponding ORFs of the nonactin biosynthetic gene cluster from S...
June 17, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28631385/identification-of-glucose-kinase-dependent-and-independent-pathways-for-carbon-control-of-primary-metabolism-development-and-antibiotic-production-in-streptomyces-coelicolor-by-quantitative-proteomics
#5
Jacob Gubbens, Marleen M Janus, Bogdan I Florea, Herman S Overkleeft, Gilles P van Wezel
No abstract text is available yet for this article.
July 2017: Molecular Microbiology
https://www.readbyqxmd.com/read/28628996/pvp-and-peg-doped-cuo-nanoparticles-are-more-biologically-active-antibacterial-antioxidant-antidiabetic-and-cytotoxic-perspective
#6
Rabia Javed, Madiha Ahmed, Ihsan Ul Haq, Sobia Nisa, Muhammad Zia
Search for biologically active nanoparticles is prerequisite for biomedical applications. CuO nanoparticles synthesized by co-precipitation method are capped by polyethylene-glycol (PEG) and polyvinyl-pyrrolidone (PVP) on the surface by simple adsorption. Physical and chemical properties carried out by SEM, XRD and FTIR confirm nanometer in size and efficient capping of PVP and PEG on CuO NPs. Biological assays reveal higher activities of CuO-PEG and CuO-PVP as compared to the uncapped CuO nanoparticles. CuO-PEG shows better antitumor activity against Streptomyces as compared with CuO-PVP and CuO NPs...
October 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28627048/derivatives-of-holomycin-and-cyclopropaneacetic-acid-from-streptomyces-sp-dt-a37
#7
Hui Ding, Jianan Wang, Dashan Zhang, Zhongjun Ma
On the basis of the one strain-many compounds (OSMAC) strategy, five compounds including two new holomycin derivatives (2-3), two new cyclopropaneacetic acid derivatives (4-5), together with one known compound holomycin (1) were isolated from a marine-derived bacterium Streptomyces sp. DT-A37. Their structures were elucidated using NMR and HRESIMS analyses. All these compounds were evaluated for their antimicrobial activity, cytotoxic activity, and inhibitory activity against BRD4 protein. Compound 1 exhibited potent cytotoxicity against H1975 cells with IC50 value of 1 μM, and its MIC values against Escherichia coli and Staphylococcus aureus were both 64 μM...
June 19, 2017: Chemistry & Biodiversity
https://www.readbyqxmd.com/read/28626267/a-facile-semi-synthetic-approach-towards-halogen-substituted-aminobenzoic-acid-analogues-of-platensimycin
#8
Lin Qiu, Kai Tian, Jian Pan, Lin Jiang, Hu Yang, Xiangcheng Zhu, Ben Shen, Yanwen Duan, Yong Huang
Platensimycin (PTM), produced by several strains of Streptomyces platensis, is a promising drug lead for infectious diseases and diabetes. The recent pilot-scale production of PTM from S. platensis SB12026 has set the stage for the facile semi-synthesis of a focused library of PTM analogues. In this study, gram-quantity of platensic acid (PTMA) was prepared by the sulfuric acid-catalyzed ethanolysis of PTM, followed by a mild hydrolysis in aqueous lithium hydroxide. Three PTMA esters were also obtained in near quantitative yields in a single step, suggesting a facile route to make PTMA aliphatic esters...
February 9, 2017: Tetrahedron
https://www.readbyqxmd.com/read/28625960/production-of-an-antibiotic-enterocin-from-a-marine-actinobacteria-strain-h1003-by-metal-stress-technique-with-enhanced-enrichment-using-response-surface-methodology
#9
Syed Shamsul Hassan, Sayed Asmat Ali Shah, Chengqian Pan, Leilei Fu, Xun Cao, Yutong Shi, Xiaodan Wu, Kuiwu Wang, Bin Wu
Elicitation by chemical means including heavy metals is one of a new technique for drug discoveries. In this research, the effect of heavy metals on marine actinobacteria Streptomyces sp. H-1003 for the production of enterocin, with a strong broad spectrum activity, along optimized fermented medium was firstly investigated. The optimum metal stress conditions consisted of culturing marine actinobacteria strain H-1003 with addition of cobalt ions at 2mM in optimized Gause's medium having starch at 20mg/L for 10 days at 180 revolution/min...
January 2017: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/28621039/wbla-a-pleiotropic-regulatory-gene-modulating-morphogenesis-and-daptomycin-production-in-streptomyces-roseosporus
#10
Xingwei Huang, Tingmei Ma, Jun Tian, Lan Shen, Hua Zuo, Changhua Hu, Guojian Liao
AIMS: The wblA gene, encoding a homolog of the WhiB family protein, was identified in the sequenced genome of daptomycin producer S.roseosporus. To explore the function of wblA, we construct wblA disruption strains, complemented strains and overexpression strains to test whether it can affect the production of secondary metabolites and morphogenesis. METHODS AND RESULTS: We constructed disruption strains by homologous recombination in S.roseosporus. The disruption mutant of wblA could block aerial mycelium sporulation and enhance the production of daptomycin by 51%...
June 16, 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28620687/identification-and-characterization-of-a-biosynthetic-gene-cluster-for-tryptophan-dimers-in-deep-sea-derived-streptomyces-sp-scsio-03032
#11
Liang Ma, Wenjun Zhang, Yiguang Zhu, Guangtao Zhang, Haibo Zhang, Qingbo Zhang, Liping Zhang, Chengshan Yuan, Changsheng Zhang
Tryptophan dimers (TDs) are an important class of natural products with diverse bioactivities and share conserved biosynthetic pathways. We report the identification of a partial gene cluster (spm) responsible for the biosynthesis of a class of unusual TDs with non-planar skeletons including spiroindimicins (SPMs), indimicins (IDMs), and lynamicins (LNMs) from the deep-sea derived Streptomyces sp. SCSIO 03032. Bioinformatics analysis, targeted gene disruptions, and heterologous expression studies confirmed the involvement of the spm gene cluster in the biosynthesis of SPM/IDM/LNMs, and revealed the indispensable roles for the halogenase/reductase pair SpmHF, the amino acid oxidase SpmO, and the chromopyrrolic acid (CPA) synthase SpmD, as well as the positive regulator SpmR and the putative transporter SpmA...
June 15, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28620660/carpatizine-a-novel-bridged-oxazine-derivative-generated-by-non-enzymatic-reactions
#12
Peng Fu, John B MacMillan
Carpatizine (1), a new bridged oxazine derivative, was isolated from a marine-derived Streptomyces strain SNE-011. The structure was fully determined by spectroscopic analysis, ECD calculations and chemical methods. A plausible non-enzymatic reaction mechanism from daryamide D leading to carpatizine was presented, which was confirmed by chemical transformation.
June 16, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28620204/neo-actinomycins-a-and-b-natural-actinomycins-bearing-the-5h-oxazolo-4-5-b-phenoxazine-chromophore-from-the-marine-derived-streptomyces-sp-imb094
#13
Qiang Wang, Yixuan Zhang, Mian Wang, Yi Tan, Xinxin Hu, Hongwei He, Chunling Xiao, Xuefu You, Yiguang Wang, Maoluo Gan
Neo-actinomycins A and B (1 and 2), two new natural actinomycins featuring an unprecedented tetracyclic 5H-oxazolo[4,5-b]phenoxazine chromophore, were isolated from the marine-derived actinomycete Streptomyces sp. IMB094. Their structures were elucidated by spectroscopic analyses. The presence of this ring system was proposed to originate from a condensation between actinomycin D (3) with α-ketoglutarate and pyruvate, respectively. Compound 1 showed potent cytotoxic activities against human cancer HCT116 and A549 cell lines in the nanomolar range (IC50: 38...
June 15, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28619816/correction-for-vazquez-hernandez-et-al-draft-genome-sequence-of-streptomyces-scabrisporus-nf3-an-endophyte-isolated-from-amphipterygium-adstringens
#14
Melissa Vazquez-Hernandez, Corina Diana Ceapa, Stefany Daniela Rodríguez-Luna, Romina Rodríguez-Sanoja, Sergio Sánchez
No abstract text is available yet for this article.
June 15, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28619813/complete-genome-sequences-of-the-endophytic-streptomyces-sp-strains-lup30-and-lup47b-isolated-from-lucerne-plants
#15
Christopher M M Franco, Eric M Adetutu, Hoang X Le, Ross A Ballard, Ricardo Araujo, Shanan S Tobe, Bobby Paul, Sandeep Mallya, Kapaetu Satyamoorthy
The complete genome sequences of two endophytic Streptomyces sp. strains, LUP30 and LUP47B, were analyzed. These strains were isolated from surface-sterilized roots of lucerne plants from South Australia and were found to promote the growth of the rhizobial partner in vitro and significantly increased nodulation and nitrogen fixation in lucerne plants.
June 15, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28615847/larvicidal-potency-of-marine-actinobacteria-isolated-from-mangrove-environment-against-aedes-aegypti-and-anopheles-stephensi
#16
S Balakrishnan, P Santhanam, M Srinivasan
The marine soil samples were collected from different locations of Parangipettai mangrove ecosystem, Vellar estuary, southeast coast of India. Totally 30 different marine actinobacteria were isolated by serial dilution plate technique on starch casein agar medium. The isolated actinobacteria were investigated for their larvicidal activity against Aedes aegypti and Anopheles stephensi mosquitoes. Streptomyces fungicidicus, S. griseus, S. albus, S. alboflavus and S. rochei were identified as potential biocide producers...
June 2017: Journal of Parasitic Diseases: Official Organ of the Indian Society for Parasitology
https://www.readbyqxmd.com/read/28611737/de-novo-biosynthesis-of-apigenin-luteolin-and-eriodictyol-in-the-actinomycete-streptomyces-albus-and-production-improvement-by-feeding-and-spore-conditioning
#17
Laura Marín, Ignacio Gutiérrez-Del-Río, Paula Yagüe, Ángel Manteca, Claudio J Villar, Felipe Lombó
Nutraceutical compounds as plant flavonoids play an important role in prevention and modulation of diverse heath conditions, as they exert interesting antifungal, antibacterial, antioxidant, and antitumor effects. They also possess anti-inflammatory activities in arthritis, cardiovascular disease or neurological diseases, as well as modulatory effects on the CYP450 activity on diverse drugs. Most flavonoids are bioactive molecules of plant origin, but their industrial production is sometimes hindered due to reasons as low concentration in the plant tissues, presence in only some species or as a complex mixture or inactive glycosides in plant vacuolae...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28611443/identification-of-a-gene-cluster-for-telomestatin-biosynthesis-and-heterologous-expression-using-a-specific-promoter-in-a-clean-host
#18
Keita Amagai, Haruo Ikeda, Junko Hashimoto, Ikuko Kozone, Miho Izumikawa, Fumitaka Kudo, Tadashi Eguchi, Takemichi Nakamura, Hiroyuki Osada, Shunji Takahashi, Kazuo Shin-Ya
Telomestatin, a strong telomerase inhibitor with G-quadruplex stabilizing activity, is a potential therapeutic agent for treating cancers. Difficulties in isolating telomestatin from microbial cultures and in chemical synthesis are bottlenecks impeding the wider use. Therefore, improvement in telomestatin production and structural diversification are required for further utilization and application. Here, we discovered the gene cluster responsible for telomestatin biosynthesis, and achieved production of telomestatin by heterologous expression of this cluster in the engineered Streptomyces avermitilis SUKA strain...
June 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28611250/translational-control-of-the-sigr-directed-oxidative-stress-response-in-streptomyces-via-if3-mediated-repression-of-a-noncanonical-gtc-start-codon
#19
Morgan A Feeney, Govind Chandra, Kim C Findlay, Mark S B Paget, Mark J Buttner
The major oxidative stress response in Streptomyces is controlled by the sigma factor SigR and its cognate antisigma factor RsrA, and SigR activity is tightly controlled through multiple mechanisms at both the transcriptional and posttranslational levels. Here we show that sigR has a highly unusual GTC start codon and that this leads to another level of SigR regulation, in which SigR translation is repressed by translation initiation factor 3 (IF3). Changing the GTC to a canonical start codon causes SigR to be overproduced relative to RsrA, resulting in unregulated and constitutive expression of the SigR regulon...
June 13, 2017: MBio
https://www.readbyqxmd.com/read/28606541/pectin-conjugated-silica-microcapsules-as-dual-responsive-carriers-for-increasing-the-stability-and-antimicrobial-efficacy-of-kasugamycin
#20
Chen Fan, Mingcheng Guo, You Liang, Hongqiang Dong, Guanglong Ding, Wenbing Zhang, Gang Tang, Jiale Yang, Dandan Kong, Yongsong Cao
Kasugamycin is an aminoglycoside antibiotic originally isolated from Streptomyces kasugaensis, which has been widely used for the management of plant diseases. However, photo-thermal instability and low efficiency limit its application. Therefore, it is an urgent task to prevent unwanted loss of kasugamycin and ensure maximum bioactivity at target site. In this work, a novel formulation of kasugamycin that responds to different biological stimuli produced by pests was prepared using silica microcapsules crosslinked with pectin via special disulfide bonds...
September 15, 2017: Carbohydrate Polymers
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