• Title/Summary/Keyword: biological activity

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Biological Activities and Partial Characterization of Beauveria bassiana Mycelium

  • Park, Sung-Yong;Song, Hyuk-Hwan;Lee, Yong-Gab;Yoon, Cheol-Sik;Lee, Chan
    • Food Science and Biotechnology
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    • v.17 no.1
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    • pp.95-101
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    • 2008
  • Some biological activities of Beauveria bassiana were studied to elucidate pharmacological function of B. bassiana-infected larva of the silkworm. The mycelium consisted mainly of carbohydrate (65.8%), followed by protein (15.9%) and fat (8.3%). Glucose (68.8%), mannose (7.1%), and galactose (6.1%) were major components in carbohydrates. Ten amino acids including glutamine, threonine, valine, aspartic acid, alanine, leucine, serine, glycine, arginine, and isoleucine were found in protein as major amino acids. Various extracts were prepared from the freeze-dried mycelium of B. bassiana by systemic extraction and their biological activities were investigated. Among tested fractions, the hot-water extract (HW) contributed significantly to the anti-coagulant activity, anti-complementary activity, and stimulation of intestinal immune system. The methanol extract (ME) increased acetylcholinesterase (AChE) inhibition activity and reactive oxygen species (ROS) scavenging activity.

A Novel Thrombolytic and Anticoagulant Serine Protease from Polychaeta, Diopatra sugokai

  • Kim, Hye Jin;Shim, Kyou Hee;Yeon, Seung Ju;Shin, Hwa Sung
    • Journal of Microbiology and Biotechnology
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    • v.28 no.2
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    • pp.275-283
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    • 2018
  • Ischemic stroke can result from blockage of blood vessels, forming fibrin clots in the body and causing irreparable brain damage. Remedial thrombolytic agents or anticoagulants have been studied; however, because the FDA-approved tissue plasminogen activator has low efficacy and side effects, it is necessary to develop safer and more effective treatment candidates. This study aimed at assessing the fibrinolytic and anticoagulation features of a novel serine protease extracted and purified from Diopatra sugokai, a polychaeta that inhabits tidal flats. The purified serine protease was obtained through ammonium sulfate precipitation, affinity chromatography, and ion-exchange chromatography. Its molecular size was identified via SDS-PAGE. To characterize its enzymatic activities, the protease activity at various pH and temperatures, and in the presence of various inhibitors, was measured via azocasein assay. Its fibrinolytic activity and anticoagulant effect were assessed by fibrin zymography, fibrin plate assay, and fibrinogenolytic activity assays. The novel 38 kDa serine protease had strong indirect thrombolytic activity rather than direct activity over broad pH (4-10) and temperature ($37^{\circ}C-70^{\circ}C$) ranges. In addition, the novel serine protease exhibited anticoagulant activity by degrading the ${\alpha}$-, ${\beta}$-, and ${\gamma}$-chains of fibrinogen. In addition, it did not produce cytotoxicity in endothelial cells. Therefore, this newly isolated serine protease is worthy of further investigation as a novel alkaline serine protease for thrombolytic therapy against brain ischemia.

Functional Study of Lysine Decarboxylases from Klebsiella pneumoniae in Escherichia coli and Application of Whole Cell Bioconversion for Cadaverine Production

  • Kim, Jung-Ho;Kim, Hyun Joong;Kim, Yong Hyun;Jeon, Jong Min;Song, Hun Suk;Kim, Junyoung;No, So-Young;Shin, Ji-Hyun;Choi, Kwon-Young;Park, Kyung Moon;Yang, Yung-Hun
    • Journal of Microbiology and Biotechnology
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    • v.26 no.9
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    • pp.1586-1592
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    • 2016
  • Klebsiella pneumoniae is a gram-negative, non-motile, rod-shaped, and encapsulated bacterium in the normal flora of the intestines, mouth, skin, and food, and has decarboxylation activity, which results in generation of diamines (cadaverine, agmatine, and putrescine). However, there is no specific information on the exact mechanism of decarboxylation in K. pnuemoniae. Specifically lysine decarboxylases that generate cadaverine with a wide range of applications has not been shown. Therefore, we performed a functional study of lysine decarboxylases. Enzymatic characteristics such as optimal pH, temperature, and substrates were examined by overexpressing and purifying CadA and LdcC. CadA and LdcC from K. pneumoniae had a preference for L-lysine, and an optimal reaction temperature of 37℃ and an optimal pH of 7. Although the activity of purified CadA from K. pneumoniae was lower than that of CadA from E. coli, the activity of K. pneumoniae CadA in whole cell bioconversion was comparable to that of E. coli CadA, resulting in 90% lysine conversion to cadaverine with pyridoxal 5'-phosphate L-lysine.

Antioxidant and Antimicrobial Effects of Lemon and Eucalyptus Essential Oils against Skin Floras (레몬 및 유칼립투스 에센셜오일의 피부 상재균에 대한 항산화 및 항균 효과)

  • Kim, Ji-Hye;Kim, Min-Jung;Choi, Su-Ki;Bae, Seung-Hee;An, Sung-Kwan;Yoon, Yeong-Min
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.37 no.4
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    • pp.303-308
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    • 2011
  • Lemon and eucalyptus oils were known to have various biological effects such as anti-aging and sterilizing action. However these essential oils were not well studied about their antioxidant activity and antimicrobial activity against specific skin flora. In this study, we investigated antioxidant activity and antimicrobial activity of lemon and eucalyptus oils by using DPPH radical scavening activity and paper disc method. Lemon oil showed the high DPPH scavenging activity, while eucalyptus oil did not. Blending oils of lemon and eucalyptus had little enhancememt onantioxidant activity. Paper disc method demonstrated that each oil had a high antimicrobial effect against C. albicans and P. acnes in a concentration dependent manner. The blending oils had enhancememt on antimicrobial effect against P. acnes. In conclusion, the blending oil of lemon and eucalyptus can be used as a more effective natural agents for cure of skin trouble and acne.

Single-Cell-Imaging-Based Analysis of Focal Adhesion Kinase Activity in Plasma Membrane Microdomains Under a Diverse Composition of Extracellular Matrix Proteins (다양한 ECM 조건하에서의 세포막 미세영역 부위 국소접착인산화효소 활성의 단일세포 이미징 기반 분석)

  • Choi, Gyu-Ho;Jang, Yoon-Kwan;Suh, Jung-Soo;Kim, Heon-Su;Ahn, Sang-Hyun;Han, Ki-Seok;Kim, Eunhye;Kim, Tae-Jin
    • Journal of Life Science
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    • v.32 no.2
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    • pp.148-154
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    • 2022
  • Focal adhesion kinase (FAK) is known to regulate cell adhesion, migration, and mechanotransduction in focal adhesions (FAs). However, studies on how FAK activity is regulated in the plasma membrane microdomains according to the composition of extracellular matrix (ECM) proteins are still lacking. A genetically encoded fluorescence resonance energy transfer (FRET)-based biosensor can provide useful information on the activity of intracellular signals with high spatiotemporal resolution. In this study, we analyzed the FAK activities in lipid raft (detergent-resistant membrane) and non-lipid raft (non-detergent-resistant membrane) microdomains using FRET-based membrane targeting FAK biosensors (FAK-Lyn and FAK-KRas biosensors) under four different ECM protein compositions: glass, type 1 collagen, fibronectin, and laminin. Interestingly, FAK activity in response to laminin in a lipid raft microdomain was lower than that in other ECM conditions. Cells subjected to fibronectin showed higher FAK activity in a lipid raft microdomain than that in a non-lipid raft microdomain. Therefore, this study demonstrates that the FAK activity can be distinctively regulated according to the ECM type and the environment of the plasma membrane microdomains.

Antioxidant and Whitening Effect of Crocus chrysanthus (Herb.) Herb. Bulb Extracts (골든크로쿠스비늘줄기 추출물의 항산화 및 미백 효과)

  • Kyung Wan Yoo;So Min Lee;So Young Jung;Hyojin Heo;Byungsun Cha;Sofia Brito;Lei Lei;Sang Hun Lee;You-Yeon Chun;Ha Hyeon Jo;Ye Ji Kim;Mi-Gi Lee;Byeong-Mun Kwak;Bum-Ho Bin
    • Journal of the Society of Cosmetic Scientists of Korea
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    • v.49 no.1
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    • pp.39-46
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    • 2023
  • In this study, Crocus chrysanthus (Herb.) Herb. bulb extracts were extracted by purified water and ethanol, and their antioxidant and tyrosinase inhibitory activity were measured to see the possibility as a cosmetic material. The yield of the extracts was 1.8% to 6.0%, and the yield decreased as the ethanol concentration increased. DPPH free radical (1,1-diphenyl-2-picrylhydrazyl) scavenging activity was high at 91.97% at 625 ㎍/mL of 70% ethanol extract. The total phenol content was also measured at 447 mg/g, higher than other extraction methods. The whitening effect was confirmed through in vitro tyrosinase inhibitory activity. As the ethanol concentration of the extracts increased, the tyrosinase inhibitory activity increased, and 70% and 94.5% ethanol extracts showed high inhibitory activity. Therefore, the Crocus chrysanthus (Herb.) Herb. bulb extracts confirmed its potential as a cosmetic material through antioxidant and whitening effects.

Structure and Biological Activity of K(H2O)L (L = 5,7-Dihydroxy-6,4'-dimethoxyisoflavone-3'-sulfonate)

  • Guo, Ya-Ning;Zhang, Xue-Ling;Zhang, Zun-Ting
    • Bulletin of the Korean Chemical Society
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    • v.27 no.9
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    • pp.1289-1292
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    • 2006
  • Potassium(I) with 5,7-dihydroxy-6,4'-dimethoxyisoflavone-3'-sulfonate (L) assembles to K($H_2O$)L (L = 5,7-dihydroxy-6,4'-dimethoxyisoflavone-3'-sulfonate). It was characterized by single-crystal X-ray diffraction, element analysis, IR and $^1H$ NMR spectroscopy. It crystallizes in the monoclinic space group $P2_1$/n and reveals a seven-coordinate complex. Polyhedra potassium chains, C-H${\cdot}{\cdot}{\cdot}\pi$ and C-H${\cdot}{\cdot}{\cdot}$O and O-H${\cdot}{\cdot}{\cdot}$O hydrogen bonds lead K($H_2O$)L to a three-dimensional network structure. The biological activity of resistance to hypoxia was tested, and the results showed that the biological activity of resistance to hypoxia of K($H_2O$)L is as good as that of its precursor, irisolidone.