• 제목/요약/키워드: Esterase

검색결과 471건 처리시간 0.028초

벼멸구의 유기인계(有機燐系) 살충제저항성(殺蟲劑抵抗性)에 대(對)하여(II) 생화학적특성(生化學的特性) 비교(比較) (Studies on Resistance to Organophosphorus Insecticide in the Brown Planthopper, Nilaparvata lugens $St{\aa}l$ (II) Difference of the Biochemical Characteristic)

  • 김정화;황태구
    • 한국응용곤충학회지
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    • 제26권3호
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    • pp.165-170
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    • 1987
  • 본(本) 실험(實驗)은 벼멸구에 대한 반수치사약량(半數致死藥量)의 차이(差異)를 나타내는 저항성(抵抗性) 및 감수성계통(感受性系統)과 그들의 교잡종(交雜種) $F_1$에 대(對)한 생화학적(生化學的) 특성(特性)을 구명(究明)하고자 실시(實施)하였다. 살충제무처리(殺蟲劑無處理)의 esterase활성(活性)은 저항성계통(抵抗性系統)과 교잡종(交雜種) $F_1$이 감수성계통(感受性系統)에 비(比)하여 높았으며, diazinon, MEP, BPMC 처리후(處理後) esterase의 활성변화(活性變化)는 저항성계통(抵抗性系統)과 교잡종(交雜種) $F_1$에서는 별차이(別差異)가 없었으나 감수성계통(感受性系統)에서는 현저(顯著)히 떨어졌다. Esterase의 높은 활성(活性)은 저항성발달(抵抗性發達)과 관계(關係)가 있었으며 교잡종(交雜種) $F_1$에서 esterase 활성(活性)이 높게 나타난 것은 저항성계통(抵抗性系統)이 우성인자(優性因子)로 유전(遺傳)됨을 알 수 있었다.

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Spirometra ernacei의 발육에 따른 Esterase와 Phosphatase의 조직 화학적 연구 (Enzyme-Htstochemical Studie5 of Esterase and Phosphatase on Developing Spirometra erinacei)

  • 곽기훈;김창환
    • 한국동물학회지
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    • 제31권3호
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    • pp.225-235
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    • 1988
  • spirometra ernacei의 제3기 유충 plerocercoid(sparganum)를 중간숙주인 흰쥐와 종숙주인 고양이에게 감염시켜서 회수한 sparganum과 성충의 non-specific esterase와 acid,alkaline phosphatased의 분포 및 isozyme pattern 변화를 비교하기 위하여 효소조직화학적 방법과 전기영동법을 이용하여 다음과 같은 결과를 얻었다. 첫째,non-specific esterase는 sparganum과 성체의 근층과 유조직층에 많이 분포하였고 표피층에는 거의 분포가 없었다. 이의 isozyme band pattern은 sparganum에서 7개의 성체에서 8개의 isozyme band로 분리 되었는데 sparganum과 성체의 major band는 각각 3번과 4번 band였다. 둘째,acid phosphatse는 sparganum과 성체의 표피층과 근층에서 많이 부포하였고 유조직층에는 거의 분포가 없었다. isozyme band pattern은 sparganum과 성체에서 각각 3개의 band로 분리되었는데 3번 band가 major band였다.셋째, alkaline phoosphatase는 sparganum과 성체의 표피층과 근층에서 많은 분포를 보였으며 유조직층에서 더 상당한 분포가 있었다. isozyme band pattern은 sparganum에서 2개 성체에서 4개가 분리되었는데 sparganum성체 모두 2번 band가 major band였다.

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A New Esterase, Belonging to Hormone-Sensitive Lipase Family, Cloned from Rheinheimera sp. Isolated from Industrial Effluent

  • Virk, Antar Puneet;Sharma, Prince;Capalash, Neena
    • Journal of Microbiology and Biotechnology
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    • 제21권7호
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    • pp.667-674
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    • 2011
  • The gene for esterase (rEst1) was isolated from a new species of genus Rheinheimera by functional screening of E. coli cells transformed with the pSMART/HaeIII genomic library. E. coli cells harboring the esterase gene insert could grow and produce clear halo zones on tributyrin agar. The rEst1 ORF consisted of 1,029 bp, corresponding to 342 amino acid residues with a molecular mass of 37 kDa. The signal P program 3.0 revealed the presence of a signal peptide of 25 amino acids. Esterase activity, however, was associated with a homotrimeric form of molecular mass 95 kDa and not with the monomeric form. The deduced amino acid sequence showed only 54% sequence identity with the closest lipase from Cellvibrio japonicus strain Ueda 107. Conserved domain search and multiple sequence alignment revealed the presence of an esterase/ lipase conserved domain consisting of a GXSXG motif, HGGG motif (oxyanion hole) and HGF motif, typical of the class IV hormone sensitive lipase family. On the basis of the sequence comparison with known esterases/ lipases, REst1 represents a new esterase belonging to the class IV family. The purified enzyme worked optimally at $50^{\circ}C$ and pH 8, utilized pNP esters of short chain lengths, and showed best catalytic activity with p-nitrophenyl butyrate ($C_4$), indicating that it was an esterase. The enzyme was completely inhibited by PMSF and DEPC and showed moderate organotolerance.

북방수염하늘소(Monochamus saltuarius) 성충의 살충제 처리에 따른 소화 효소의 활성 변화 (Changes in Esterase Isozyme Activity After Pesticides Treatment in Digestive Juice of Monochamus saltuarius (Gebler) Adult)

  • 박용철;조세열
    • 농약과학회지
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    • 제11권3호
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    • pp.179-185
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    • 2007
  • 북방수염하늘소(M. saltuarius) 성충 장(gut)내에 존재하는 소화액에 대한 에스테라제(esterase)의 활성 변화를 in vitro에서 조사하였다. ${\alpha}$-naphthyl acetate와 ${\alpha}$-naphthyl butyrate 기질을 이용한 실험에서는 4개의 밴드가 관찰되었다. Carbofuran과 methomyl을 비교 처리한 결과 methomyl에서 강한 효소활성 저해가 관찰되었다. 특히 Est1은 carbofuran과 methomyl에 의해 모두 저해되는 것으로 나타났다. Chlorpyrifos, methidation, phenthoate를 비교 처리한 결과 chlorpyrifos에 의해 모든 밴드들이 저해되는 것을 볼 수 있었다. 특히 Est1은 chlorpyrifos에 의해 효소활성이 완전히 저해되었고, methidation 처리시 약 70% 정도의 효소활성이 저해 되었다. Eserine을 처리한 결과 Est1은 약 70% 정도의 활성 저해를, Est2, Est3, Est4에서는 미미한 효소활성 저해가 나타났다. ${\alpha}$-pinene에서는 뚜렷한 효소활성 저해는 관찰할 수 없었으나 bornyl acetate와 camphor에서는 미미한 효소활성 저해가 관찰되었다.

발아중인 벼 품종별 Malathion 가수분해효소에 관한연구 (A Study on Malathion-hydrolyzing Esterases of Germinating Seeds of Some Rice Plant Varieties)

  • 이재구
    • Applied Biological Chemistry
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    • 제14권3호
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    • pp.229-235
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    • 1971
  • 우리나라에서 재배되고 있는 대표적인 수도 품종 중에서 japonica type으로 관옥, 후지사까 5호, 팔달, 수원 82호의 4품종과 indica type으로 IR-262 CP-slo의 2품종을 선정하여 estel형 인 유기인계 살충제 malathion과 방향족 ester로서 p-nitrophenyl acetate에 대한 esterase의 활성을 비교해 보고 agar-gel electrophoresis에 의하여 ${\alpha}-naphthyl$ acetate를 기질로 하여 esterase의 zymogram을 관찰한 바를 요약해 보면 다음과 같다. 1. 조효소액(crude enzyme)의 malathion가수분해 능력을 효소액일정량에 대한 분해된 malathion milligram으로 비교하면 관옥>IR-262>후지사까 5호>CP-slo>팔달>수원 82호의 순으로 관옥이 가장 활성이 강하고 팔달, 수원 82호가 가장 약하다. 2. Esterase zymogram을 보면 품종간에 대차없이 $3{\sim}4$개의 band가 두극으로 움직이며 cathode로 특히 굵고 진한 band가 있고 수원 82호는 다른 품종과 약간 다른 pattern을 보였다. 3. p-Nitrophenyl acetate를 기질로 할 때 매 milligram 단백질당의 흡광도로 활성을 비교하면 CP-slo>IR-262>팔달>관옥>수원 82호>후지사까 5호의 순으로 indica type의 품종이 훨씬 활성이 강하나 malathion 경우와 일치하지는 않는다. 4. 0.2ppm 정도의 malathion으로 벼의 esterase는 별로 저해 되지 않았다. 5. 발아중인 벼종자에는 malathion과 p-nitrophenyl acetate를 가수분해하는 복합 esterase가 존재 할 것으로 추측된다.

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D-β-Acetylthioisobutyric acid 생산을 위한 내열성 광학선택적 esterase 활성 Klebsiella pneumoniae의 분리 (A newly isolated Klebsiella pneumoniae producing a thermostable stereo-selective esterase for production of D-β-acetylthioisobutyric acid)

  • 정용준
    • 미생물학회지
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    • 제55권2호
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    • pp.143-148
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    • 2019
  • 라세믹체 형태의 전구물질 methyl DL-${\beta}$-acetylthioisobutyrate (DL-ester)로부터 captopril 합성과정의 중간물질로 알려져 있는 D-${\beta}$-acetylthioisobutyric acid (DAT)를 효율적으로 제조하기 위해 광학선택적 esterase활성을 가진 신규 미생물을 탐색하였고 활성이 우수한 균주 CJ-317과 균주 CJ-187을 선별하고 동정한 결과, 각각 Klebsiella pneumoniae와 Pseudomonas putida로 동정하였다. 두 균주가 생산하는 esterase의 최적 반응온도와 내열성을 조사한 결과, P. putida CJ-187와 K. pneumoniae CJ-317의 최적활성은 각각 $60^{\circ}C$$75^{\circ}C$이었으며 또한 P. putida CJ-187의 경우, $60^{\circ}C$까지 안정한 반면 K. pneumoniae CJ-317은 $80^{\circ}C$에서도 1시간 동안 안정된 내열성 효소의 특성을 보였다. DAT에 의한 최종 산물의 활성 저해도에 있어서도 P. putida CJ-187은 2.5%와 5%의 DAT에 대해 각각 55%와 80%의 저해활성을 보인 반면 K. pneumoniae CJ-317는 각각 35%와 44%의 낮은 저해활성을 보임으로서 K. pneumoniae CJ-317은 captopril 합성의 중간체인 DAT 제조과정에 유용하게 활용할 수 있는 우수한 내열성 광학선택적 esterase 활성을 가지는 신규 균주임을 확인하였다.

Synthesis, Urease and Acetylcholine Esterase Inhibition Activities of Some 1,4-Disubstituted Thiosemicarbazides and their 2,5-Disubstituted Thiadiazoles

  • Saleem, Muhammad;Rafiq, Muhammad;Hanif, Muhammad;Rama, Nasim Hasan;Seo, Sung-Yum;Lee, Ki-Hwan
    • Bulletin of the Korean Chemical Society
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    • 제33권8호
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    • pp.2741-2747
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    • 2012
  • A new series of 2,5-disubstituted-1,3,4-thiadiazoles 6a-i was synthesized by overnight stirring various 1,4-disubstituted thiosemicarbazides 5a-i in polyphosphoric acid followed by neutralization. The structures of newly synthesized compounds 5a-i and 6a-i were characterized by IR, $^1H$ and $^{13}C$ NMR, elemental analysis and mass spectrometric studies. All the synthesized compounds were evaluated for their urease and acetylcholine esterase inhibition activities. Thiosemicarbazides 5a-i are found to possess excellent potential for urease inhibition, more than the standard drug. Thiosemicarbazides 5a-i are more potent urease inhibitor than their cyclic analogues thiadiazoles 6a-i. Almost all of the compounds are excellent inhibitors of acetylcholine esterase. The inhibition of acetylcholine esterase of compounds 5a, 5c, 5d, 5g, 5i, 6e, 6f, 6g, and 6i is much more than that of standard drug.

봉약침액(蜂藥鍼液)이 Scopolamine으로 기억장애(記憶障碍) 유발(誘發) 시 Acetylcholine Esterase 활성에 미치는 영향(影響) (The Effect of Bee Venom on Acetylcholine Esterase Activity during Scopolamine Induced Memorial Impairment)

  • 송정열;송호섭
    • Journal of Acupuncture Research
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    • 제23권3호
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    • pp.117-127
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    • 2006
  • Alzheimer's disease (AD) is the most prevalent form of neurodegenerative disease associated with aging in the human population. This disease is characterized by the following 4 structural changes : Atrophy of the Cortex, Parasympathetic, and other neural cells, the existence of Neurofibrillary tangles (NFTs), and the accumulation of Senile plaques. NFTs and Senile plaques is known to be the index of this disease. Senile plaques disturbs the neutro transmission and depletes of Acetylcholine. So, Recovery of Acetylcholine is the primal objective for treating Alzheimer's disease. So, Inhibiting the activity of Acetylcholine Esterase (AChE), which causes the hydrolysus of acetylcholine into choline and acetate, can be seen as a key role for treating Alzheimer's disease. Increasing body of evidence has been demonstrated that Bee Venom Acupuncture (BV) could compete with complex protein involving in multiple step of $NF-_{\kappa}B$ activation and exert the anti-inflammatory potential of combined inhibition of the prostanoid and nitric oxide synthesis systems by inhibition of IKK and $NF-_{\kappa}B$. BV dose-dependently attenuated Scopolamine-induced Acetylcholine esterase activities in cerebral cortex and hippocampus of the mice brain. This study therefore suggests that BV acupuncture method may be useful for prevention of development or progression of AD.

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One-step purification and biochemical characterization of a (s)-stereospecific esterase from Pseudomonas fluorescens KCTC 1767

  • 최기섭;김지희;김지연;김근중;유연우
    • 한국생물공학회:학술대회논문집
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    • 한국생물공학회 2002년도 생물공학의 동향 (X)
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    • pp.445-448
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    • 2002
  • The Pseudomonas fluorescens KCTC 1767, a selected and identified as potential candidate for stereo-specific resolution of rac-ketoprofen ethyl ester, was systematically investigated in order to induce the high level expression and detailed characterization of the expressing enzyme esterase. We cloned the esterase gene from chromosomal DNA of Pseudomonas fluorescens KCTC 1767 by PCR with two synthetic primers that desinged for simple purification. The recombinant esterase from Pseudomonas fluorescens KCTC 1767 exibited a high conversion rate and enantioselectivity to the (S)-ketoprofen ethyl ester as expected. The enzyme was easily purified to homogeniety by using a metal chelating affinity chromatography as a protein with poly histidine taq, and thus obtained 0.6 mg of protein from a 100 mL culture broth in a single step. The purified enzyme was steadily stable at the pH range from 7.0 to 10. The activity was also retained to be about 70% after the preincubation at $40^{\circ}C$ but over $50^{\circ}C$ lost the activity completely. The molecular mass of the esterase was estimated to be about 43 kDa on SDS-PAGE, and an identical result was also shown in gel filteration chromatography. The specific activity was calculated 27 mM/mg-protein/min by using the rac-ketoprofen ethly ester as a substrate.

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Helper-Independent Live Recombinant Adenovirus Vector Expressing the Hemagglutinin-Esterase Membrane Glycoprotein

  • YOO, DONGWAN;ICK-DONG YOO;YOUNG-HO YOON;FRANK L GRAHAM;LORNE A. BABIUK
    • Journal of Microbiology and Biotechnology
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    • 제2권3호
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    • pp.174-182
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    • 1992
  • The hemagglutinin-esterase glycoprotein (HE) gene of bovine coronavirus, coupled with a simian virus 40 early promoter and polyadenylation signal, was inserted into a human adenovirus transfer vector. The transfer vector was used to co-transfect 293 cells along with adenovirus genomic DNA. The hemagglutinin-esterase transcription unit was rescued into the adenovirus genome by homologous in vivo DNA recombination between the vector plasmid DNA and the adenovirus genomic DNA, and a recombinant adenovirus was isolated by several rounds of plaque assays. Thus the recombinant adenovirus carries the hemagglutinin-esterase gene in the early transcription region 3 (E3) of the adenovirus genome in the parallel orientation to the E3 transcription. The recombinant adenovirus synthesized the HE polypeptide in HeLa cells as demonstrated by immunoprecipitation with anti-coronavirus rabbit antisera. The recombinant HE polypeptide could be labelled by $[^3H]$glucosamine, demonstrating that the recombinant HE was glycosylated. Cells expressing the HE polypeptide exhibited hemadsorption activity when incubated with mouse erythrocytes. The HE was transported to the plasma membrane as shown by the cell surface immunofluorescence, indicating that the recombinant HE polypeptide retained its biological activities. Potential for the use of infectious recombinant adenovirus as a live virus-vectored vaccine candidate for bovine coronavirus disease is discussed.

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