The Viability Change of Yeast Cell Responding to Trehalose Accumulation and Maintaining Neutral Trehalase Activity under Extracellular pH Acidified by $H_2SO_4$

Jin, Ingnyol,Yun, Haesun,Paik, Sanhkyoo,Kim, Ilsup,Sohn, Ho-Yong Korean Society of Life Science 2002 Journal of Life Science Vol.12 No.2

Saccharomyces cerevisiae KNU5377 (KNU5377) and S. cerevisiae ATCC24858 (ATCC24858) were exposed to $H_2SO_4$ as a stress, which was added at various concentrations to a YPD media. The growth of KNU5377 was reduced to approximately 60% in the YPD media containing 40 nm sulfuric acid when compared to the non-stressed condition. When their growth was monitored during an overnight culture, two strains, KNU5377 and ATCC24858, could not grow when exposed to over 50 mM of sulfuric acid. After a short exposure to this acid for 1 h, KNU5377 exhibited stronger resistance against $H_2SO_4$ than ATCC24858. The neutral trehalase activity of KNU5377 unchanged despite under various concentrations of $H_2SO_4$. In contrast, It at of ATCC24858 was much low at higher $H_2SO_4$concentrations. Trehalose, a non-reducing disaccharide, was maximally accumulated after a short exposure to 60 nm $H_2SO_4$ for KNU5377, but it was reduced under more severe stressful conditions. These results suggest that KNU5377 should modulate the trehalose concentrations under the severe stress condition of high sulfuric acid concentrations. The most highly induced protein in the KNU5377 exposed to sulfuric acid was found to be an approximately 23 kDa protein, which was revealed to be the 605 large subunit ribosomal protein, Ll3 by FASTA search results.

Adaptive Stress Response to Menadione-Induced Oxidative Stress in Saccharomyces cerevisiae KNU5377

김일섭,손호용,Ingnyol Jin 한국미생물학회 2011 The journal of microbiology Vol.49 No.5

The molecular mechanisms involved in the ability of yeast cells to adapt and respond to oxidative stress are of great interest to the pharmaceutical, medical, food, and fermentation industries. In this study, we investigated the time-dependent, cellular redox homeostasis ability to adapt to menadione-induced oxidative stress, using biochemical and proteomic approaches in Saccharomyces cerevisiae KNU5377. Time-dependent cell viability was inversely proportional to endogenous amounts of ROS measured by a fluorescence assay with 2′,7′-dichlorofluorescin diacetate (DCFHDA), and was hypersensitive when cells were exposed to the compound for 60 min. Morphological changes, protein oxidation and lipid peroxidation were also observed. To overcome the unfavorable conditions due to the presence of menadione, yeast cells activated a variety of cell rescue proteins including antioxidant enzymes, molecular chaperones, energy-generating metabolic enzymes, and antioxidant molecules such as trehalose. Thus, these results show that menadione causes ROS generation and high accumulation of cellular ROS levels, which affects cell viability and cell morphology and there is a correlation between resistance to menadione and the high induction of cell rescue proteins after cells enter into this physiological state, which provides a clue about the complex and dynamic stress response in yeast cells.

Acid Stress Response of Streptococcus mutans Isolated from Korean Children with Caries

Kyung-hee Kang,Ingnyol Jin 한국생명과학회 2008 한국생명과학회 심포지움 Vol.49 No.-

The Calcineurin Inhibition by Overexpression of Cabin-1 Has a Potential Therapeutic Effect in Rheumatoid Arthritis

Hei Jung Kim(김혜정),IngNyol Jin(진익렬),Zae Young Ryoo(류재웅) 한국생명과학회 2008 생명과학회지 Vol.18 No.5

류마티스 관절염은 활액막 내의 염증성 세포와 cytokine의 침적으로 인한 만성적인 염증이 계속 진행되어 연골과 뼈의 파괴 등이 발생하는 특징을 가진 심각한 자가면역질환의 일종이다. Calcineurin은 면역 세포의 활성화를 책임지는 대표적인 세포 내 신호전달 단백질이다. Calcineurin의 억제제로 알려진 Cabin-1을 과발현시키는 유전자 치료를 통해 류마티스 관절염의 새로운 치료법을 시도하게 되었다. 본 연구에서는 EL-4 세포에 calcineurin 저해제인 Cabin-1을 과발현시켜 배양된 세포에서 유전자의 발현정도와 발현의 지속성을 측정하고자 하였다. 또한 형질전환된 류마티스 모델 동물의 간, 림프절, 비장 등의 조직에서 Cabin-1 단백질 발현여부를 조사하고자 하였다. 그 결과 calcineurin이 EL-4 세포에서 발현함을 확인하였으며 calcineurin의 생리학적 억제제인 Cabin-1유전자를 transfection했을 경우 calcineurin phophatase activity가 감소됨을 확인하였다. 또한 Cabin-1의 생체 내 기능을 해석하기 위해 형질전환 생쥐를 생산하였으며 간, 비장, 폐, 말초혈액단핵세포 및 림프절에서 Cabin-1의 발현을 검증하였다. 그러나 Cabin-1 유전자가 T 세포의 발생과 활성에 영향을 끼쳐 심한 면역결핍증상으로 인해 Cabin-1 형질전환 생쥐의 계통을 유지할 수가 없었다. 결론적으로 calcineurin을 억제하는 Cabin-1유전자의 발현벡터를 구축하였으며 이는 in vivo에서 Cabin-1유전자와 calcineuirn사이의 기작 및 Cabin-1의 기능을 해석하는데 중요한 매개가 될 수 있다. 또한 류마티스 관절염을 포함하여 루푸스, 다발성 경화증, 당뇨병 등과 같은 다양한 면역질환의 발병 원인을 밝혀내고 치료에 응용될 수 있다. Rheumatoid arthritis (RA) is characterized by a tumor-like expansion of the synovium, which is composed of proliferation, infiltrating leukocytes and angiogenesis. Calcineurin is expressed and plays a critical role in inflammatory arthritis. Calcineruin binding protein (Cabin)-1 associates with calcineurin, leading to a non-competitive inhibitor of calcineurin activity. We investigated the expression pattern of calcineurin in inflammatory arthritis. The overexpression of Cabin-1 inhibited calcineurin phosphatase activity in in vitro. Moreover, we produced the T cell-specific Cabin-1 transgenic mice but they died without transmitting the transgene to offspring. The Cabin-1 transgenic mice have a dominant lymph node expression and a wide tissue distribution. It is postulated that transgenic mice died from the critical effects of the transgene on T cell development or activation. Data suggests that the inhibition of calcineurin by the overexpression of Cabin-1 may be an effective strategy for the suppression of inflammatory arthritis.

Yarrowia lipolytica 504D의 Alkaline Proteinase 특성

김창화,진익렬,유춘발,Kim, Chang-Hwa,Jin, Ingnyol,Yu, Choon-Bal 한국미생물학회 1998 미생물학회지 Vol.34 No.3

Yarrowia lipolytica 504D가 생산하는 alkaline proteinase를 정제한 결과, 분자량은 32,000으로 나타났고, pH 9.5와 $42^{\circ}C$에서 최적활성을 보였으며, pH 4-10의 범위와 $45^{\circ}C$까지 비교적 안정한 것으로 나타났다. PMSF를 비롯하여 EDTA, EGTA, phenanthrolin도 효소활성을 저해하여 정제효소가 serine proteinase인지 metal proteinase인지 불확실하였다. 그러나 28% 활성증가를 보인 $Cu^{2+}$ 외에 $Zn^{2+}$를 비롯한 대부분의 무기염들이 효소활성을 증가시키지 못하였고, 또한 EDTA의 첨가로 불활성화된 효소도 Ca 염의 첨가로 활성이 복원되었다. 따라서 정제효소는 serine proteinase(E.C. 3.4.21.14)로 추정되었다. An alkaline proteinase secreted from Yarrowia lipolytica 504D was purified by salting-out and column chromatography. The molecular weight of the purified enzyme was about 32,000 Da estimated by SDS-PAGE. The optimal condition for the activity of the enzyme was at pH 9.5 and $42^{\circ}C$ The enzyme was stable up to $45^{\circ}C$ and at the range of pH 4-10. Because the enzyme was inhibited by PMSF as well as EDTA, EGTA, and phenan-throlin, it is uncertain whether the enzyme is serine proteinase or metalloproteinase. However, almost all metal salts tested did not increase the enzyme activity, and Ca salt restored the activity of the enzyme inactivated by EDTA. Therefore, the purified enzyme seems to be an serine proteinase (E.C. 3.4.21.14).

Alkaline Proteinase를 생산하는 Yarrowia lipolytica 504D의 분리 동정

김창화,진익렬,유춘발,Kim, Chang-Hwa,Jin, Ingnyol,Yu, Choon-Bal 한국미생물학회 1998 미생물학회지 Vol.34 No.3

자연계로부터 분리한 효모중에서 새우젓으로부터 분리한 효모균주 504D가 alkaline 조건에서 가장 우수한 proteinase 생산성을 보여 분류동정하였다. 분리효모의 형태학적 특성은 주로 영양세포로 출아증식을 하였으나, citric acid가 함유된 MM 배지에서만 위균사를 형성하였고, N-acetylglucosamin과 ${\beta}$-D-glucose가 첨가된 MM 배지에서만 진균사를 형성하였다. 유성적으로 자낭포자를 형성함으로써 반자낭균류이었고, 무성적으로 출아포자 및 분절 포자를 형성하였다. 생리생화학적인 특성으로 대부분의 탄소원과 nitrate 및 nitrate를 이용하지 못하였으나 일부 유기산과 알콜류를 이용하였다. 세포지방산을 분석한 결과, 불포화지방산 53.67%와 포화지방산 14.58%로 나타났으며, 대조균들에는 관찰되지 않는 C17:1이 관찰되었다. 전체적인 실험결과에서 분리균은 균사형성능과 세포지방산의 조성에서 약간의 차이를 제외하면 대조균 Saccharomycopsis lipolytica KCCM 12495 및 KCCM 35426의 모든 특성들과 거의 동일하여 분리효모 504D를 Yarrowia lipolytica로 동정하였다. The yeast strain 504D, isolated from salted shrimp soup, showed the best proteolytic activity under alkaline condition. The yeast formed vegetative cells in almost optimal media for yeasts, but formed only pseudohyphae in the MM medium containing citric acid and true hyphae in the MM medium containing N-acetylglucosamin and ${\beta}$-D-glucose. The yeast was classified as hemiascomycetes to form ascospores by sexual reproduction, and formed blastospores and athrospores by asexual reproduction. The yeast strain did not assimilate almost of the carbon sources, nitrate and nitrite, but some organic acids and alcohols. The fatty acids of whole cells were composed of 53.67% unsaturated fatty acids and 14.58% saturated, and, especially, C17:1 was observed in this strain but not in two control yeasts. However, almost of all results were very similar to the morphological and physiological characteristics of Yarrowia lipolytica KCCM 12495 and KCCM 35426, except for a little differences which are the composition of fatty acids and the manner of mycellium formation. Therefore, the isolated yeast strain 504D is identified as a Yarrowia lipolytica.

Stabilization of plasma membrane and oxidative stress induction for heat shock stress in Saccharomycese cerevisiae KNU5377

Hyeyun Moon,Il-sup Kim,Ingnyol Jin 한국생명과학회 2004 한국생명과학회 심포지움 Vol.41 No.-

Autonomous ultradian metabolic oscillation of Saccharomyces cerevisiae KNU5377

Jaeyoul Choi,Il-sup Kim,Ingnyol Jin,Ho-Yong Sohn 한국생명과학회 2004 한국생명과학회 심포지움 Vol.41 No.-

2, 3-Cyclic Nucleotide 3-Phosphodiesterase Is Expressed in Dissociated Rat Cerebellar Cells and Included in the Postsynaptic Density Fraction

문일수,Sun-Jung Cho,Jae Seob Jung,IngNyol Jin 한국분자세포생물학회 2003 Molecules and cells Vol.16 No.1

Different perturbation profiles induced by glutathione during ultradian metabolic oscillation of Saccharomyces cerevisiae

Ho-Yong Sohn,Gi-Seok Kwon,Ingnyol Jin,Young-Sook Kim,Ha-Young Kwon,Hiroshi Kuriyama 한국생명과학회 2003 한국생명과학회 심포지움 Vol.39 No.-