32 research outputs found

    Screening, production and biochemical characterization of a new fibrinolytic enzyme produced by Streptomyces sp. (Streptomycetaceae) isolated from Amazonian lichens

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    Thrombosis is a pathophysiological disorder caused by accumulation of fibrin in the blood. Fibrinolytic proteases with potent thrombolytic activity have been produced by diverse microbial sources. Considering the microbial biodiversity of the Amazon region, this study aimed at the screening, production and biochemical characterization of a fibrinolytic enzyme produced by Streptomyces sp. isolated from Amazonian lichens. The strain Streptomyces DPUA1576 showed the highest fibrinolytic activity, which was 283 mm2. Three variables at two levels were used to assess their effects on the fibrinolytic production. The parameters studied were agitation (0.28 - 1.12 g), temperature (28 - 36 ºC) and pH (6.0 - 8.0); all of them had significant effects on the fibrinolytic production. The maximum fibrinolytic activity (304 mm2) was observed at 1.12 g, 28 ºC, and pH of 8.0. The crude extract of the fermentation broth was used to assess the biochemical properties of the enzyme. Protease and fibrinolytic activities were stable during 6 h, at a pH ranging from 6.8 to 8.4 and 5.8 to 9.2, respectively. Optimum temperature for protease activity ranged between 35 and 55 °C, while the highest fibrinolytic activity was observed at 45 ºC. Proteolytic activity was inhibited by Cu2+ and Co2+ ions, phenylmethylsulfonyl fluoride (PMSF) and pepstatin A, which suggests that the enzyme is a serine protease. Enzymatic extract cleaved fibrinogen at the subunits A-chain, A-chain, and -chain. The results indicated that Streptomyces sp. DPUA 1576 produces enzymes with fibrinolytic and fibrinogenolytic activity, enzymes with an important application in the pharmaceutical industry.The authors grateful acknowledge the financial support of Fundação de Amparo a Pesquisa do Estado de Pernambuco (FACEPE, Pernambuco, Brazil, N. 0158-2.12/11), CNPq/ RENORBIO (National Counsel of Technological and Scientific Development, N.55146/2010-3) and National Council for the Improvement of Higher Education (CAPES, Brazil) for the scholarship. The author thanks editor and reviewers for their review and comments.info:eu-repo/semantics/publishedVersio

    Extractive Cultivation Of Xylanase By Penicillium Janthinellum In A Poly(ethylene Glycol)/cashew-nut Tree Gum Aqueous Two-phase System

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    Cultivation of the fungus Penicillium janthinellum for xylanase production was studied in a poly(ethylene glycol)/cashew-nut tree gum aqueous two-phase system, using a two-level fractional factorial design. The parameters studied were initial pH, cultivation time, type of agro-industrial residue (oat husk or corn cob), agitation, temperature, and phase-forming polymers. The xylanase produced during fermentation partitioned into the top phase. The agitation and temperature (negative), cultivation time and initial pH (positive) effects proved statistically significant for xylanase production. The highest percentage yield of the xylanase in the top and its production in the top phase, about 97% and 160.7 U/mL, were obtained in cultures of 120 h, 40 rpm, 25°C, and pH 5.0.20618801884Albertsson, P.A., (1986) Partition of Cell Particles and Macromolecules, 3rd Ed., , Wiley Interscience: New YorkSinha, J., Dey, P.K., Panda, T., Aqueous two-phase: The system of choice for extractive fermentation (2000) Appl. Microbiol. Biotechnol., 54, pp. 476-486Persson, I., Tjerneld, F., Hahn-Hagerdal, B., Production of β-glucosidase by Aspergillus phoenicis QM329 in aqueous two-phase systems (1989) Biotechnol. Tech., 3, pp. 265-270Hotha, S., Banik, R.M., Production of alkaline protease by Bacillus thurigiensis H14 in aqueous two-phase systems (1997) J. Chem. Technol. Biotechnol., 69, pp. 5-10Kuboi, R., Umakoshi, H., Komasawa, I., Extractive cultivation of Escherichia coli using poly(ethylene glycol)/phosphate aqueous two-phase system to produce intracellular β-galactosidase (1995) Biotechnol. 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B, 766, pp. 27-36Barros Neto, B., Scarminio, I.S., Bruns, R.E., (2001) Como Fazer Experimentos: Pesquisa e Desenvolvimento Na Ciência e Na Indústria, 1st Ed., , UNICAMP: BrazilHaltrich, D., Nidetzky, B., Kulbe, K.D., Steiner, W., Zupancic, S., Production of fungal xylanases (1996) Bioresour. Technol., 58, pp. 137-161Parajó, J.C., Domínguez, H., Dominguez, J.M., Biotechnological production of xylitol. Part 3: Operation in culture media made from lignocellulose hydrolysates (1998) Bioresour. Technol., 66, pp. 25-40Costa, S.A., Pessoa Jr., A., Roberto, I.C., Partitioning of xylanolytic complex from Penicillium janthinellum by an aqueous two-phase system (2000) J. Chromatogr. B, 743, pp. 339-348Bim, M.A., Franco, T.T., Extraction in aqueous two-phase systems of alkaline xylanase produced by Bacillus pumilus and its application in kraft pulp bleaching (2000) J. Chromatogr. 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