• 제목/요약/키워드: cellulases

검색결과 107건 처리시간 0.03초

Efficient Isolation and Characterization of a Cellulase Hyperproducing Mutant Strain of Trichoderma reesei

  • Zou, Zongsheng;Zhao, Yunying;Zhang, Tingzhou;Xu, Jiaxing;He, Aiyong;Deng, Yu
    • Journal of Microbiology and Biotechnology
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    • 제28권9호
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    • pp.1473-1481
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    • 2018
  • A cellulase hyperproducing mutant strain, JNDY-13, was obtained using the ARTP mutation system and with Trichoderma reesei RUT-C30 as the parent strain. Whole-genome sequencing of JNDY-13 confirmed that 105 of the 653 SNPs were point mutations, 336 mutations were deletions and 165 were insertions. Moreover, 99 mutations were insertions and duplications. Among all the mutations, the one that occurred in the galactokinase gene might be related to the production of cellulases in T. reesei JNDY-13. Moreover, the up-regulation of cellulase and hemicellulase genes in JNDY-13 might contribute to higher cellulases production. Under optimal conditions, the highest cellulase activity by batch fermentation reached 4.35 U/ml, and the highest activity of fed-batch fermentation achieved was 5.40 U/ml.

Selection of Multienzyme Complex-Producing Bacteria Under Aerobic Cultivation

  • Pason Patthra;Chon Gil-Hyong;Ratanakhanokchai Khanok;Kyu Khin Lay;Jhee Ok-Hwa;Kang Ju-Seop;Kim Won-Ho;Choi Kyung-Min;Park Gil-Soon;Lee Jin-Sang;Park Hyun;Rho Min-Suk;Lee Yun-Sik
    • Journal of Microbiology and Biotechnology
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    • 제16권8호
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    • pp.1269-1275
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    • 2006
  • The selection of multienzyme complex-producing bacteria under aerobic condition was conducted for improving the degradation of lignocellulosic substances. The criteria for selection were cellulase and xylanase enzyme production, the presence of cellulose-binding domains and/or xylan-binding domains in enzymes to bind to insoluble substances, the adhesion of bacterial cells to insoluble substances, and the production of multiple cellulases and xylanases in a form of a high molecular weight complex. Among the six Bacillus strains, isolated from various sources and deposited in our laboratory, Paenibacillus curdlanolyticus B-6 strain was the best producer of cellulase and xylanase enzymes, which have both cellulose-binding factors (CBFs) and xylan-binding factors (XBFs). Moreover, multiple carboxymethyl cellulases (CMCases) and xylanases were produced by the strain B-6. The zymograms analysis showed at least 9 types of xylanases and 6 types of CMCases associated in a protein band of xylanase and cellulase with high molecular weight. These cells also enabled to adhere to both avicel and insoluble xylan, which were analyzed by scanning electron microscopy. The results indicated that the strain B-6 produced the multienzyme complex, which may be cellulosome or xylanosome. Thus, P. curdlanolyticus B-6 was selected to study the role and interaction between the enzymes and their substrates and the cooperation of multiple enzymes to enhance the hydrolysis due to the complex structure for efficient cellulases and xylanases degradation of insoluble polysaccharides.

흡착법에 의한 Fomitopsis pinicola 유래 cellulase의 고정화와 그에 따른 효소특성 변화 (Immobilization of Cellulases from Fomitopsis pinicola and Their Changes of Enzymatic Characteristics)

  • 신금;김태종;김영균;김영숙
    • Journal of the Korean Wood Science and Technology
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    • 제38권3호
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    • pp.251-261
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    • 2010
  • Formiptosis pinicola KMJ812에 의해 생산된 조효소액은 섬유소 분해효소 복합체로서 매우 활성이 높으며 특히 ${\beta}$-glucosidase의 활성이 높아 포도당 전환수율이 높다. 본 연구에서는 F. pinicola KMJ812 생산 cellulase를 고정화에 따른 효소특성의 변화와 고정화 효소의 재사용에 따른 효소의 불활성 정도를 관찰하였다. 담체는 고정화 수율이 cellulase활성 61.7%와 ${\beta}$-glucosidase활성 64.4%로 우수한 Duolite A568로 선정하였다. 고정화 효소의 최적반응온도는 cellulase와 ${\beta}$-glucosidase 활성의 경우 모두$55^{\circ}C$로서 수용성효소보다 높았으며, 최적 pH는 cellulase활성은 4.0이었고, ${\beta}$-glucosidase활성은 4.5로 cellulase활성의 경우에서만 수용성효소와 비교하여 약간 염기성으로 변화하였다. 본 고정화 효소는 $50^{\circ}C$에서 72시간 후에 98%의 활성을 유지하고 있었으며, $50^{\circ}C$에서 8회 사용 후에 50%정도의 잔존활성을 나타내었다.

Synergism between Cellulases from Tricoderma sp. C-4.

  • Youn, Soo-In;Seol, Ok-Joo;Jeong, Choon-Soo;Chung, Dae-Kyun;Park, Hye-Seon
    • 한국동물학회:학술대회논문집
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    • 한국동물학회 2000년도 한국생물과학협회 학술발표대회
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    • pp.234.3-235
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    • 2000
  • No Abstract, See Full Text

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Effects of Combined Treatment of Lactic Acid Bacteria and Cell Wall Degrading Enzymes on Fermentation and Composition of Rhodesgrass (Chloris gayana Kunth.) Silage

  • Ridla, M.;Uchida, S.
    • Asian-Australasian Journal of Animal Sciences
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    • 제11권5호
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    • pp.522-529
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    • 1998
  • This experiment was conducted to study the effects of lactic acid bacteria (LAB) inoculation either alone or in combination with cell wall degrading enzymes on the fermentation characteristics and chemical compositions of Rhodesgrass silage. Over to 1 kg of fresh Rhodesgrass sample a treatment of inoculant LAB with or without addition of an enzyme of Acremoniumcellulase (A) or Meicelase (M) or a mixture of both enzymes (AM) was applied. The treatments were control untreated, LAB-treated (application rate $1.0{\times}10^5cfu/g$ fresh sample), LAB+A 0.005%, LAB+A 0.01%, LAB+A 0.02%, LAB+M 0.005%, LAB+M 0.01%, LAB+M 0.02 %, LAB+AM 0.005%, LAB+AM 0.01%, and LAB+AM 0.02%. The sample was ensiled into 2-L vinyl bottle silo, with 9 silages of each treatment were made. Three silages of each treatment were incubated at 20, 30 and $40^{\circ}C$ for 2-months of storage period. All silages were well preserved with their fermentation quality has low pH values (3.91-4.26) and high lactic acid concentrations (4.11-9.89 %DM). No differences were found in fermentation quality and chemical composition of the control untreated silage as compared to the LAB-treated silage. Combined treatment of LAB+cellulases improved the fermentation quality of silages measured in terms of lower (p < 0.01) pH values and higher (p < 0.05) lactic concentrations than those of LAB-treated silages. Increasing amount of cellulase addition resulted in decrease (p < 0.05) of pH value and increase (p < 0.05) of lactic acid concentration. LAB + cellulase treatments (all cellulase types) reduced (p < 0.01) NDF, ADF and in vitro dry matter digestibility of silages compared with the control untreated silages. The fermentation quality and the rate of cell wall reduction were higher (p < 0.01) in the silages treated with LAB + cellulase A than in the silages treated with either LAB+cellulase M or LAB + cellulase AM. Incubation temperature of $40^{\circ}C$ was likely to be more appropriate environment for stimulating the fermentation of Rhodesgrass silages than those of 20 and $30^{\circ}C$.

Trichoderma harzianum FJ1의 고체상태배양에 의한 섬유소분해효소의 생산 (Production of Cellulolytic Enzymes by Trichoderma harzianum FJ1 in Solid State Fermentation.)

  • 유승수;김경철;김성준
    • 한국미생물·생명공학회지
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    • 제31권3호
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    • pp.257-263
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    • 2003
  • 고체상태배양에서 섬유소분해효소의 고 생산을 위해 기질로서 다양한 섬유순폐기물을 검토한 결과, 주정박과 볏짚을 1:1의 혼합기질로 사용하였을 때 13.98 FPA를 얻었다. 효소생산을 높이기 위해 주정박과 볏짚의 혼합기질에 질소원으로서 콩비지를 1:1:1로 혼합하였을 때 15.22 FPA의 효소활성을 얻을 수 있었다. 이때의 최적의 함수율, pH, 온도는 각각 70%, 5.0, 3$0^{\circ}C$이었다. 최적배양조건에서 배양 5일째 FPA, CMCase, Xylanase, $\beta$-glucosidase 및 Avicelase의 효소활성은 각각 15.22, 69.1, 83.9, 29.2 및 4.2 unit/g-SDW이었다. T. harzianum FJI의 섬유소폐기물을 이용한 고체상 태배양의 경제적인 효소생산은 섬유소폐기물의 생물학적 당화기술에 크게 기여할 것이다.

잿빛곰팡이병균(Botrytis cinerea) 형태형 간의 생리적 다양성 (Physiological Diversity between Morphological Phenotypes of Botrytis cinerea)

  • 김병섭;박은우;노성환;조광연
    • 한국균학회지
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    • 제25권4호통권83호
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    • pp.320-329
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    • 1997
  • 병든 오이, 토마토, 딸기로부터 분리한 Botrytis cinerea을 Paul(1928)의 형태형(morphological phenotypes) 분류 기준에 따라 포자형, 균핵형, 균사형으로 나눌 때 대부분의 균주는 균핵형으로 나타났다. Benzimidazole 및 dicarboximide계 살균제에 대한 감수성 및 저항성 반응 차이는 형태형과는 무관하였다. 포자의 표면 구조를 주사형 전자현미경으로 관찰한 결과 모두 봉상으로 형태형 간에 차이가 없었다. 형태형 간 병원성을 비교할 때, 균사형의 균주가 가장 병원성이 높았으며, 포자형은 병원성이 다른 형보다 낮게 나타났다. 병원성과 곰팡이의 phenol oxidase, pectin methyl esterases (PME), amylases, cellulases, ureases, glucosidases 및 proteinases 활성과의 관계를 조사하기 위하여 형태형이 다른 선발된 균주들의 효소 활성을 조사한 결과, Phenol oxidase, ${\beta}-glucosidase$는 각 형태형 간에 차이가 없었으나, PME, amylase, cellulase, urease, proteinase의 활성은 각 형태형간에 차이를 나타내어 병원성과 이들 효소 활성의 관련성이 있었다.

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목재부후균, Acanthophysium sp. KMF001, 유래 섬유소분해효소를 이용한 섬유 개량 (Biopolishing of Cotton Fabric using Crude Cellulases from Acanthophysium sp. KMF001)

  • 신금;윤새민;김주혜;김영균;김태종;김영숙
    • Journal of the Korean Wood Science and Technology
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    • 제44권3호
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    • pp.381-388
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    • 2016
  • 면직물 표면의 잔털을 제거하여 새 옷 같은 느낌을 주기 위한 환경친화적 방법으로 셀룰라아제를 이용한 바이오폴리싱 방법이 도입되어 산업적으로 널리 이용되고 있다. 본 연구에서는 목재의 당화능력이 우수한 Acanthophysium sp. KMF001 효소를 분리해내어 이 효소의 바이오폴리싱 효과를 평가하였다. 실험을 통해 선정한 최적 바이오폴리싱 처리조건은 $50^{\circ}C$, pH 4.5, 처리효소농도는 면직물 중량 대비 10%, 반응시간은 60분으로 나타났다. 실험결과 최적화된 조건에서 처리한 면직물의 인장강도는 감소율이 상업용 효소보다 적었으며 전자현미경 관찰결과 잔털제거효과가 우수하여 바이오폴리싱 효과가 있는 것으로 평가되었다. 따라서 실험에 사용한 Acanthophysium sp. KMF001이 바이오폴리싱에 효과적으로 적용 가능한 효소로 판단된다.