• Title, Summary, Keyword: biological activity

Search Result 6,005, Processing Time 0.054 seconds

Production of Selenium Peptide by Autolysis of Saccharomyces cerevisiae

  • Lee Jung-Ok;Kim Young-Ok;Shin Dong-Hoon;Shin Jeong-Hyun;Kim Eun-Ki
    • Journal of Microbiology and Biotechnology
    • /
    • v.16 no.7
    • /
    • pp.1041-1046
    • /
    • 2006
  • Selenium-containing peptide (selenium peptide) was produced by autolysis of total proteins of Saccharomyces cerevisiae grown with inorganic selenium. Selenium peptide exhibited antioxidant activity as a glutathione peroxidase (GPx) mimic, and its activity was dependent on the hydrolysis methods. The GPx-like activity of the hydrolyzed selenium peptide increased 2.7-folds when digested by protease, but decreased by acid hydrolysis. During the autolysis of the yeast cell, the GPx-like activity and selenium content increased 4.3- and 2.3-folds, respectively, whereas the average molecular weight (MW) of selenium peptide decreased 70%. The GPx-like activity was dependent on the MW of selenium peptide and was the highest (220 U/mg protein) at 9,500 dalton. The maximum GPx-like activity (28,600 U/g cell) was obtained by 48 h of autolysis of the cells, which were precultured with 20 ppm of selenate. Selenium peptide showed little toxicity, compared with highly toxic inorganic selenium. These results show the potential of selenium peptide as a nontoxic antioxidant that can be produced by simple autolysis of yeast cells.

Griseofulvin from Xylaria sp. Strain F0010, an Endophytic Fungus of Abies holophylla and its Antifungal Activity Against Plant Pathogenic Fungi

  • PARK, JOONG-HYEOP;CHOI, GYUNG-JA;LEE, SEON-WOO;LEE, HYANG-BURM;KIM, KYOUNG-MO;JUNG, HACK-SUNG;JANG, KYOUNG-SOO;CHO, KWANG-YUN;KIM, JIN-CHEOL
    • Journal of Microbiology and Biotechnology
    • /
    • v.15 no.1
    • /
    • pp.112-117
    • /
    • 2005
  • Abstract Griseofulvin has been used as an antifungal antibiotic for the treatment of mycotic diseases of humans and veterinary animals. The purpose of this work was to identify a griseofulvin-producing endophytic fungus from Abies holophylla and evaluate its in vivo antifungal activity against plant pathogenic fungi. Based on nuclear ribosomal ITS1-5.8SITS2 sequence analysis, the fungus was identified and labeled as Xylaria sp. F0010. Two antifungal substances were purified from liquid cultures of Xylaria sp. F0010, and their chemical identities were determined to be griseofulvin and dechlorogriseofulvin through mass and NMR spectral analyses. Compared to dechlorogriseofulvin, griseofulvin showed high in vivo and in vitro antifungal activity, and effectively controlled the development of rice blast (Magnaporthe grisea), rice sheath blight (Corticium sasaki), wheat leaf rust (Puccinia recondita), and barley powdery mildew (Blumeria graminis f. sp. hordei), at doses of 50 to 150 ${\mu}$g/ml, depending on the disease. This is the first report on the production of griseofulvin and dechlorogriseofulvin by Xylaria species.

Streptomyces griseus Trypsin (SGT) Has Gelatinase Activity and Its Proteolytic Activity Is Enhanced by Manganese

  • Chi, Won-Jae;Kim, Yoon-Hee;Kim, Jong-Hee;Kang, Dae-Kyung;Kang, Sang-Soon;Suh, Joo-Won;Hong, Soon-Kwang
    • Journal of Microbiology
    • /
    • v.41 no.4
    • /
    • pp.289-294
    • /
    • 2003
  • Gelatinase is a proteolytic enzyme that hydrolyzes gelatin. Gelatinolytic activity was detected from culture broths of Streptomyces griseus IFO13350 and HH1 by paper disc assays on 0.5% agar plates containing 1% gelatin. The concentrated extracellular protein from the S. griseus was analyzed by SDS polyacrylamide gel, and two proteins, with molecular weights of 30 and 28 kDa, respectively, were identified to have gelatinase activity by gelatin zymography. The protein with a molecular weight of 28 kDa was confirmed to be S. griseus trypsin (SGT). The effects of metal ions and metal chelators on the protease activity of the SGT were studied. Of the metal ions tested, only manganese was found to enhance the protease activity, 2.6 times, however, $Co^{2+},\;Cu^{2+},\;and\;Zn^{2+}$, and metal chelators, such as EDTA and EGTA, inhibited the SGT activity. When the protease activity of the SGT was measured at various pHs, in the presence of 5 mM $MnCl_2$, its highest activity was at pH 11.0, whereas only 60% of the maximum activity was observed between pHs 4.0 and pH 6.0, and almost 80% activity between pHs 7.0 to pH 10.0. The protease activity was measured at various temperatures in the presence of 5 mM $MnCl_2$. The SGT was found to be stable up to $60^{\circ}C$ for 30 min, while only 16% of the enzyme activity remained at $60^{\circ}C$, and at $80^{\circ}C$ almost all the activity was lost. The optimal temperature for the protease activity was $50^{\circ}C$.

Antibacterial Activity of Bioconverted Linoleic Acid Produced by Pseudomonas aeruginosa PR3

  • Shin, Seung-Young;Bajpai, Vivek K.;Hou, Ching T.;Choi, Ung-Kyu;Kim, Hak-Ryul;Kang, Sun-Chul
    • Journal of Applied Biological Chemistry
    • /
    • v.48 no.4
    • /
    • pp.167-169
    • /
    • 2005
  • Crude extract of bioconverted linoleic acid using Pseudomonas aeruginosa PR3 was evaluated for its antibacterial activity against food-borne pathogenic bacteria. Crude extract showed antibacterial activity against four Gram-positive bacteria, Staphylococcus aureus (ATCC 6538), S. aureus (KCTC 1916), Listeria monocytogenes (ATCC 19166), and Bacillus subtilis (ATCC 6633), and one Gramnegative bacterium, Pseudomonas aeruginosa (KCTC 2004), with minimum inhibitory concentrations ranging from 750 to $1,500\;{\mu}g{\cdot}ml^{-1}$. S. aureus and B. subtilis were selected for growth inhibition assays with bioconverted linoleic acid. Major antibacterial effects occurred at lag phase.

Plant Growth Promotion and Suppression of Root Disease Complex due to Meloidogyne incognita and Fusarium oxysporum by Fluorescent Pseudomonads in Tomato

  • Kumar, Tarun;Bajpai, Vivek K.;Maheshwari, Dinesh Kumar;Kang, Sun-Chul
    • Journal of Applied Biological Chemistry
    • /
    • v.48 no.2
    • /
    • pp.79-83
    • /
    • 2005
  • While screening for nematicidal activity of bacterial origins, various pseudomonads strains were inhabited in tomato rhizosphere. One isolate designated as $PE_{10}$ was selected for studies on nematicidal properties and plant growth-promoting (PGP) activity and was identified as Pseudomonas aeruginosa based on morphological features, biochemical and physiological tests, and carbohydrate utilization. To investigate nematicidal activity, Meloidogyne incognita juvenile mortality was determined using $PE_{10}$ culture filtrate. Inhibition of strain $PE_{10}$ against Fusarium oxysporum was observed using dual culture technique. Strain $PE_{10}$ showed good siderophore activity, HCN and IAA production abilities, and growth and development enhancement of tomato.

Retention of Biological Activities of the Cosmetics Manufactured with Green Tea Polyphenol and Possible Application of Irradiation Technology

  • Park, Tae-Soon;Lee, Jin-Young;Jo, Cheo-Run;An, Bong-Jeun
    • Journal of Applied Biological Chemistry
    • /
    • v.54 no.1
    • /
    • pp.33-40
    • /
    • 2011
  • Ionizing radiation can be used to improve the color of green tea extract to brighter. As a result, the irradiated green tea extract can be applied easier and broader in food or cosmetic industry. To confirm the retention of the biological activities of the cosmetic products added with green tea polyphenols (PPs), the real cosmetic products including a skin lotion (PS) and an essence (PE) cream were manufactured. Irradiation also applied to the manufactured cosmetic products to see their improvement of color and changes of biological activity. The PP showed 72% of electron donating ability (EDA) at a 5 ppm concentration and the PS and PE containing 2% PP showed higher than 60%, which was similar inhibition activity to vitamin C. The inhibition of superoxide dismutase (SOD)-like activity of PP, PS, and PE were higher than 55% at a 500 ppm concentration and the inhibition of xanthine oxidase (XOase) were also higher than 65% at a 200 ppm concentration. The measurement of lipid oxidation by addition of $Cu^{2+}$ and $Fe^{2+}$ as prooxidants showed that PP and PS had higher metal chelating ability for $Fe^{2+}$ than that of PE and the ability increased by increase of polyphenol concentration isolated from green tea. The $Cu^{2+}$ chelating ability of PP and PS showed higher than 90% at a 200 ppm concentration. Therefore, it is concluded that addition of PP in manufacturing PS and PE retains its biological activities including EDA, inhibition of XOase and SOD-like activity, and metal chelating ability in the manufactured cosmetic products. In addition, irradiation of PS and PE improved color of the products containing PP brighter without any adverse changes in biological activity of the products.

Chemical Analysis and Biological Activity of Endotoxin from Vibrio vulnificus

  • Lee, Bong-Hun
    • Journal of Life Science
    • /
    • v.11 no.1
    • /
    • pp.27-29
    • /
    • 2001
  • Vibrio vulnificus endotoxin was extracted, analyzed the chemical composition, tested its biological activity, and compared to those of Escherichia coli and Salmonella typhimurium. The major fatty acid of three endotoxins were different each other; V. vulnificus endotoxins were different each other; V. vulnificus endotoxin was myristric acid (C14:0), E. coli was lauric acid (C12:0), S. typhimurium was capric acid (C10:0). The biological activities of V. vulnificus endotoxin were similar to those of E. coli and S. typhimurium in terms of the gelation activity of the Limulus amebocyte lysate and the lethal toxicity. But the result of enzyme (AST, ALT, and LDH) analysis showed that the enzyme activity of V. vulnificus endotoxin was similar to that of E. coli, but smaller than that of S. typimurium.

  • PDF

Biological Properties of Different Types and Parts of the Dandelions: Comparisons of Anti-Oxidative, Immune Cell Proliferative and Tumor Cell Growth Inhibitory Activities

  • Lee, Sung-Hyeon;Park, Jae-Bok;Park, Hong-Ju;Cho, Soo-Muk;Park, Young-Ja;Sin, Jeong-Im
    • Preventive Nutrition and Food Science
    • /
    • v.10 no.2
    • /
    • pp.172-178
    • /
    • 2005
  • Dandelions have been reported to have medicinal properties and bioactive components that impact human health. However, the precise biological properties of dandelions and the parts of the plants possessing bioactive components remain uncertain. In this study, we evaluated 3 different types of dandelions based on their cultivation origin (Songpa, Uiryung, and native Uiryung types) as well as their 4 different plant parts (leaf, flower, root, skin). Each sample was extracted with $80\%$ methanol and then compared for the biological activities (anti-oxidative, immune cell proliferative and tumor cell growth inhibitory activities). All 3 types of dandelions possessed a degree of biological functions including the hydroxyl radical scavenger activity, immune cell proliferative activity and tumor cell growth inhibitory activity. However, there was no significant difference in these activities between the 3 dandelion types. Leaves of all three dandelion types showed the highest levels of all biological activities. To a lesser degree, the flower and root parts displayed biological activities. In the skin parts, anti-oxidative activity was also detected only at higher doses of dandelion extracts. Heating the dandelion leaf extract did not affect the biological activity, suggesting a heat-stable nature of the biological compounds. Taken together, these collective data suggest that dandelions, in particular their leaves, possess a high concentration of heat-resistant biological compounds, which are responsible for anti-oxidative, immune cell proliferative and tumor cell growth-inhibitory activities.