• Title/Summary/Keyword: biological activity

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Synthesis and biological activity of 6'-phenylgriseofulvin as analogs of antibiotic griseofulvin (항진균성항생물질 griseofulvin 유도체인 6'-phenylgriseofulvin의 합성과 항균활성)

  • Ko, Byoung-Seob;Oritani, Takayuki;Yamashita, Kyohei
    • Applied Biological Chemistry
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    • v.35 no.5
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    • pp.395-398
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    • 1992
  • In order to study the influence of a 6'-methyl group in ring C of griseofulvin ${\underline{(1)}}$ on the fungicidal activity, 6'-methyl group was replaced with a larger phenyl group as $({\pm})-6'-phenylgriseofulvin$ ${\underline{(3)}}$, $({\pm})-6'-epiphenylgriseofulvin$ ${\underline{(4)}}$, synthesized by a Diels-Alder cycloaddition. Their biological activities were examined against Botrytis allii (IFO 9430) and B. cinerea (AHU 9573). $({\pm})-6'-Phenylgriseofulvin $ ${\underline{(3)}}$ showed high activity in $25\;{\mu}g/disc$.

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Measurement of Biological Activity in Pilot Scale Dyeing Wastewater Process by Using Respirometer (호흡률 측정기를 이용한 파일럿 스케일 염색폐수처리 장치에서의 생물학적 활성 측정)

  • Jeon Hyun Hee;Choi Kwang Keun;Yoon In Jun;Lee Jin Won
    • KSBB Journal
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    • v.19 no.5
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    • pp.390-393
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    • 2004
  • Oxygen uptake rate (OUR) was used as an indicator of microbial activity. In this study OUR at dyeing wastewater in the pilot plant was monitored to examine biological activity. Correlation between inlet COD concentration and maximum OUR showed that maximum OUR was proportional to inlet COD concentration. Changes in the OUR values reflected the changing waste load in the reactor. Consequently, OUR can be used to estimate biological activity of inlet COD concentration. This study showed that biodegradable COD at dyeing wastewater could be calculated from OUR and yield coefficient. Non-biodegradable COD was able to be calculated from a difference between initial COD concentration and biodegradable COD.

Brassinosteroid-like Activity of Monoglyceride Analogues (Monoglyceride 관련물질의 Brassinosteroid-like 생물활성)

  • Park, Jong-Dae;Park, Keun-Hyung
    • Applied Biological Chemistry
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    • v.40 no.4
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    • pp.357-360
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    • 1997
  • The biological activity of monoglycerides, diglycerides, triglycerides and free fatty acids were investigated by the rice inclination test that is specific bioassay for brassinosteroids. The experimental results revealed that some diglycerides, triglycerides and free fatty acids as well as monoglycerides showed positive response. ${\alpha}-Monoolein$ and diolein as active principles showed higher activity than indole-3-acetic acid at the same concentration. From the results, it can be confirmed that the active principles are related to olein which especially have a high activity.

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Cyclic Peptides as Therapeutic Agents and Biochemical Tools

  • Joo, Sang-Hoon
    • Biomolecules & Therapeutics
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    • v.20 no.1
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    • pp.19-26
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    • 2012
  • There are many cyclic peptides with diverse biological activities, such as antibacterial activity, immunosuppressive activity, and anti-tumor activity, and so on. Encouraged by natural cyclic peptides with biological activity, efforts have been made to develop cyclic peptides with both genetic and synthetic methods. The genetic methods include phage display, intein-based cyclic peptides, and mRNA display. The synthetic methods involve individual synthesis, parallel synthesis, as well as split-and-pool synthesis. Recent development of cyclic peptide library based on split-and-pool synthesis allows on-bead screening, in-solution screening, and microarray screening of cyclic peptides for biological activity. Cyclic peptides will be useful as receptor agonist/antagonist, RNA binding molecule, enzyme inhibitor and so on, and more cyclic peptides will emerge as therapeutic agents and biochemical tools.

Stimulation of Tissue Transglutaminase Activity by Clostridium botulinum Neurotoxin Type B

  • Moon, Yu-Seok;Gi-Hyeok;Rhee, Sang-Dal;Jung, Hyun-Ho
    • Journal of Microbiology
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    • v.41 no.2
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    • pp.161-164
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    • 2003
  • Recombinant light chain of Clostridium botulinum neurotoxin type B stimulated transglutaminase activity in a dose dependent manner, Compared to native toxin, recombinant light chain showed av greater stimulatory effect on transglutaminase activity. Zn-chelating agents, inhibiting the proteolytic activity of the clostridial toxins, did not interfere with this stimulation. These results suggest that the light chain plays a major stimulatory role, which is not due to its metallopeptidase activity, but is possibly due to specific interaction with transglutaminase. More importantly, this report provides a new insight into the intracellular action of C. botulinum neurotoxins.

Comparison of Urushiol Composition and Biological Activity between Fresh Sap and Fire Distilled Sap of Lacquer Tree (생칠과 화칠의 우루시올 조성 및 생리활성 비교)

  • 김명조
    • Korean Journal of Plant Resources
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    • v.11 no.1
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    • pp.40-46
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    • 1998
  • For the comparison of the urushiol composition and biological acitivity between the fresh sap and fire distilled sap of lacquer tree(Rhus vernicifera), we analysed the urushiol composition by HPLC and EI-MS, and investigated the antioxidative , antimicrobial and anticancer acitivities according to solvent fractionations. There was no difference in the urushiol composition between fresh and fire distilled saps of lacquer tree. The hexane frqctionsof two saps showed a strong DPPH radical scaverging activity (RC50 : 7.0-7.5$\mu\textrm{g}$). They also showed a strong antifungal activity onthe spore germination of Cladosporium herbarum(MIC : 8$\mu\textrm{g}$/ml), whereas they have no or low activity against the bacteria(BAcillus subtilis , Escherichia coli). In addition , hexane and butanol fractions of two saps showed a strong inhibitory activity against cultured tumour cell lines (GI50 : 0.35, 12.29$\mu\textrm{g}$/ml) in vitro. These results confirm that the fresh sap and fire distilled sap might have the similar urushiol compositions and biological activities.

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Anti-septic activity of α-cubebenoate isolated from Schisandra chinensis

  • Kook, Minsoo;Lee, Sung Kyun;Kim, Sang Doo;Lee, Ha Young;Hwang, Jae Sam;Choi, Young Whan;Bae, Yoe-Sik
    • BMB Reports
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    • v.48 no.6
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    • pp.336-341
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    • 2015
  • Sepsis is a life-threatening, infectious, systemic inflammatory disease. In this study, we investigated the therapeutic effect of α-cubebenoate, a novel compound isolated from Schisandra chinensis against polymicrobial sepsis in a cecal ligation and puncture (CLP) experimental model. Administration of α-cubebenoate strongly enhanced survival in the CLP model. α-cubebenoate administration also markedly blocked CLP-induced lung inflammation and increased bactericidal activity by enhancing phagocytic activity and hydrogen peroxide generation in mouse bone marrow-derived macrophages and neutrophils. Expression of two important inflammatory cytokines, IL-1 and IL-6, was strongly increased in the CLP model, and this was dramatically blocked by α-cubebenoate. Lymphocyte apoptosis and caspase-3 activation, which are associated with immune paralysis during sepsis, were markedly attenuated by α-cubebenoate. Taken together, our findings indicate that α-cubebenoate, a natural compound isolated from Schisandra chinensis, is a powerful potential anti-septic agent. [BMB Reports 2015; 48(6): 336-341]

Biological Activity and Acute Toxicity of the Multimers of CJ500011 Recombinant Human Granulocyte Colony-stimulating Factor (rHuG-CSF), Produced in E. coli (재조합 사람 과립구 콜로니 자극인자인 C,J50001의 중합체의 생물학적 활성과 급성독성에 관한 연구)

  • 하석훈;이현수;김기완;정종상;김달현
    • Biomolecules & Therapeutics
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    • v.6 no.1
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    • pp.89-94
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    • 1998
  • CJ50001 is a recombinant human granulocyte colony-stimulating facto, (rHuG-CSF) that stimulates the formation of neutrophils from bone marrow stem cells. It was produced in E. colt and purified through refolding and several processes. We produced CS970125(300) using purified C150001 and additives in order to test the stability of CJ50001. When CS970125(300) was stored at 50'S for more than 1 week, high molecular weight proteins were formed and those proteins were detected by non-reducing SDS-PAGE, gel filtration HPLC, and Western blot. Those proteins showed single band at the same position of CJ50001 in reducing SDS-PAGE. These data indicated that those high molecular weight proteins were the multimers of C150001. In biological assays, iu viro and in viro, the multimers did not have biological activity and inhibitory action to that of CJ 50001. The mutimers did not induce toxicity in mice and rats in acute toxicity test. These results suggest that if Cs970125(300) containing CJ50001 is stored at 5$0^{\circ}C$, CJ50001 will be the multimers that do not have biological activity and inhibitory effect to CJ50001 and do not induce acute toxicity.

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Enhancement of Biocontrol Activity of Antagonistic Chryseobacterium Strain KJ1R5 by Adding Carbon Sources against Phytophthora capsici

  • Kim, Yu-Seok;Jang, Bo-Ra;Chung, Ill-Min;Sang, Mee-Kyung;Ku, Han-Mo;Kim, Ki-Deok;Chun, Se-Chul
    • The Plant Pathology Journal
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    • v.24 no.2
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    • pp.164-170
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    • 2008
  • Carbon utilization by Chryseobacterium strain KJ1R5 was studied to enhance its biocontrol activity against Phytophthora capsid. Chryseobacterium strain KJ1R5 has previously been shown to control Phytophthora blight of pepper (Capsicum annuum L.). Strain KJ1R5 could utilize carbon sources such as L-arabinose, D-cellobiose, ${\beta}-lactose$ and D-galactose well. P. capsici could utilize D-glucose well, showing the absorbencies ranged from 0.577 to 0.767 at 600nm. When 2% L-arabinose, which could only be utilized by the bio-control strain KJ1R5, was amended into the bacterial suspension, the efficacy of biological control increased. Among the amendments of various carbon sources into bacterial suspension, L-arabinose and D-(+)-glucose significantly enhanced biological control activity, resulting in a reduction of disease incidence to 6.9%, compared to 21.9% for the strain KJ1R5 alone and 81.3% for P. capsici inoculation alone, indicating that amendment with specific carbon sources could increase the biological control activity.

Antioxidant Activity and Biological Activity of Specialty Barley (Hordeum vulgare L.) Extracts

  • Lee, Na-Young;Kim, Yang-Kil;Choi, In-Duck;Cho, Sang-Kyun;Kweon, Hun-Jung;Lee, Kwang-Won;Hyun, Jong-Nae;Choi, Jae-Seong;Park, Ki-Hun;Kim, Kee-Jong;Lee, Mi-Ja
    • KOREAN JOURNAL OF CROP SCIENCE
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    • v.55 no.2
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    • pp.159-164
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    • 2010
  • Specialty barley extracts were prepared and investigated for its antioxidant activity and biological activity. Hunter $L^*$ values of the Iksan 86 extracts had higher than that of the Iksan 87 and Zasoojeongchal extracts. The extraction yields of Iksan 86, Iksan 87, and Zasoojeongchal was 8.08, 6.62, and 7.30%, respectively. The contents of total phenolic compounds of the Iksan 86, Iksan 87, and Zasoojeongchal extracts were 16.24, 15.51, and 13.95 GAE mg/g of sample, respectively. The DPPH radical scavenging activity of Iksan 86, Iksan 87, and Zasoojeongchal extracts were 50.00, 33.27, and 7.56% at a 500 ppm, respectively. The samples showed an inhibition of xanthin oxidase. ACE inhibition effect of specialty barley extracts, Iksan 86, Iksan 87, and Zasoojeongchal, was 39.81, 41.06, and 27.78%, respectively. Tyrosinase inhibition rates (%) of Iksan 86, Iksan 87, and Zasoojeongchal extracts were 26.21, 24.57, and 20.00%, respectively. Results indicated that specialty barley extracts possesses various biological activities including antioxidative capacity, xanthin oxidase inhibition activity, angiotensin converting enzyme inhibition activity, and tyrosinase inhibition activity.