• 생명과학회지
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• 제16권1호
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• pp.22-29
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• 2006

유기물이 풍부한 토양에서 분리하여 동정한 Bucillus stearothermophilus DL-3균주의 배양액과 사과박, 간장박 및 미강 등을 사용하여 2종류의 미생물 제재를 제조하고 닭과 돼지의 생육에 미치는 영향을 조사하였다. 사과박의 주성분은 탄수화물이며 간장박의 주성분은 단백질이다. B. stearothermophilus DL-3 균주의 배양액과 미강을 사용하여 제조한 미생물 제제를 미생물 제제 A로 명명하고 B. stearothermophilus DL-3균주의 배양액, 사과박, 간장박 및 미강을 사용하여 제조한 미생물 제제를 미생물 제제 B로 명명하였다. 미생물 제재가 닭 및 돼지의 생육에 미치는 영향을 검토하기 위하여 일반사료를 급여한 구, 일반사료의 $10\%$를 미생물 제재 A로 대체하여 급여한 구 및 일반사료의 $10\%$를 미생물 제재 B로 대체하여 급여한 구로 나누어 효과 검정실험을 수행하였다. 실험에 사용한 각 구의 평균 병아리 무게는 각각 $41.1{\pm}2.5g,\;41.6{\pm}3.2g$ 및 $42.3{\pm}2.9g$이었다. 급여를 시작하지 28일 후, 각 구에 속한 병아리들의 평균 무게는 각각 $547.7{\pm}91.7g,\;560.1{\pm}17.2g$ 및 $562.2{\pm}32.5g$이었으며 각 구에 속한 병아리들의 평균 무게 증가는 각각 506.6 g, 518.5 g 및 519.9 g이었다. 즉, 일반사료의 $10\%$를 미생물 제재 A로 대체하여 급여한 군과 일반사료의 $10\%$를 미생물 제재 B로 대체하여 급여한 군은 일반사료를 급여한 군에 비하여 각각 $2.4\%$ 및 $2.6\%$의 무게 증가를 나타났다. 각 구의 평균 돼지 무게는 각각 $9.3{\pm}1.0kg,\;9.4{\pm}1.1kg$ 및 $9.6{\pm}1.0kg$이었다. 급여를 시작한지 35일 후, 각 구에 속한 돼지들의 평균 무게는 각각 $19.3{\pm}4.1kg,\;20.2{\pm}3.9kg$ 및 $20.8{\pm}4.2kg$이었으며 각 구에 속한 돼지들의 평균 무게 증가는 각각 10.7 kg, 10.8 kg 및 11.2 kg이었다. 닭의 사료 효과 검정 결과와 같이 일반사료의 $10\%$를 미생물 제재 A로 대체하여 급여한 군과 일반사료의 $10\%$를 미생물 제재 B로 대체하여 급여한 군은 일반사료를 급여한 군에 비하여 각각 $1.6\%$ 및 $5.2\%$의 무게 증가를 나타났다.

• BMB Reports
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• 제38권2호
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• pp.151-160
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• 2005

By a cDNA array representing 2308 signal transduction related genes, we studied the expression profiles of HeLa cells stably transfected by Hepatitis C virus nonstructural protein 4B (HCV-NS4B). The alterations of the expression of four genes were confirmed by real-time quantitative RT-PCR; and the aldo-keto reductase family 1, member C1 (AKR1C1) enzyme activity was detected in HCV-NS4B transiently transfected HeLa cells and Huh-7, a human hepatoma cell line. Of the 2,308 genes we examined, 34 were up-regulated and 56 were down-regulated. These 90 genes involved oncogenes, tumor suppressors, cell receptors, complements, adhesions, transcription and translation, cytoskeletion and cellular stress. The expression profiling suggested that multiple regulatory pathways were affected by HCV-NS4B directly or indirectly. And since these genes are related to carcinogenesis, host defense system and cell homeostatic mechanism, we can conclude that HCV-NS4B could play some important roles in the pathogenesis mechanism of HCV.

• BMB Reports
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• 제48권10호
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• pp.559-564
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• 2015

We investigated the effects of mangiferin on the expression and activity of metalloproteinase (MMP)-9 and the invasion of tumor necrosis factor (TNF)-$\alpha$-stimulated human LNCaP prostate carcinoma cells. Reverse-transcription polymerase chain reaction (RT-PCR) and western blot analysis showed that mangiferin significantly reversed TNF-$\alpha$-induced mRNA and protein expression of MMP-9 expression. Zymography data confirmed that stimulation of cells with TNF-$\alpha$ significantly increased MMP-9 activity. However, mangiferin substantially reduced the TNF-$\alpha$-induced activity of MMP-9. Additionally, a matrigel invasion assay showed that mangiferin significantly reduced TNF-$\alpha$-induced invasion of LNCaP cells. Compared to untreated controls, TNF-$\alpha$-stimulated LNCaP cells showed a significant increase in nuclear factor-${\kappa}B$ (NF-${\kappa}B$) luciferase activity. However, mangiferin treatment markedly decreased TNF-$\alpha$-induced NF-${\kappa}B$ luciferase activity. Furthermore, mangiferin suppressed nuclear translocation of the NF-${\kappa}B$ subunits p65 and p50. Collectively, our results indicate that mangiferin is a potential anti-invasive agent that acts by suppressing NF-${\kappa}B$-mediated MMP-9 expression.

• 동아시아식생활학회지
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• 제10권5호
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• pp.439-444
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• 2000

호알칼리성 방선균 Streptomyes sp. B-2를 Glucose Isomerse 생성을 위해 토양에서 분리했다. Glucose Isomerase(G.I)는 high fructose glucose syrup과 fructose의 생산을 위해서 식품 공업에서 아주 중요시되고 있는 효소이다. 호알칼리성 방선균 Streptomyces sp. B-2가 생성하는 glucose isomerase(G.I.)를 정제하였다. G.I.는 (NH$_4$)$_2$So$_4$분획, DEAE-cellulose, Sephadex G-200 chromatography하여 순수 분리 하였다. 순수분리된 G.I.는 electrophoresis에 의해 확인을 했다. SDS-acrylamide gel electrophoresis에 의해 정제된 효소는 single band를 보여주었다.

• Journal of Microbiology and Biotechnology
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• 제19권10호
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• pp.1223-1229
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• 2009

To construct a new recombinant strain of Bacillus velezensis that has antifungal and insecticidal activity via the expression of the insecticidal Bacillus thuringiensis crystal protein, a B. thuringiensis expression vector (pHT1K-1Ac) was generated that contained the B. thuringiensis cry1Ac gene under the control of its endogenous promoter in a minimal E. coli-B. thuringiensis shuttle vector (pHT1K). This vector was introduced into a B. velezensis isolate that showed high antifungal activities against several plant diseases, including rice blast (Magnaporthe grisea), rice sheath blight (Rhizotonia solani), tomato gray mold (Botrytis cinerea), tomato late blight (Phytophthora infestans), and wheat leaf rust (Puccinia recondita), by electroporation. The recombinant B. velezensis strain was confirmed by PCR using cry1Ac-specific primers. Additionally, the recombinant strain produced a protein approximately 130 kDa in size and parasporal inclusion bodies similar to B. thuringiensis. The in vivo antifungal activity assay demonstrated that the activity of the recombinant B. velezensis strain was maintained at the same level as that of wild-type B. velezensis. Furthermore, it exhibited high insecticidal activity against a lepidopteran pest, Plutella xylostella, although its activity was lower than that of a recombinant B. thuringiensis strain, whereas wild-type B. velezensis strain did not show any insecticidal activity. These results suggest that this recombinant B. velezensis strain can be used to control harmful insect pests and fungal diseases simultaneously in one crop.

• Journal of Microbiology and Biotechnology
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• 제24권12호
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• pp.1609-1621
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• 2014

The plant pathogen Burkholderia gladioli, which has a broad host range that includes rice and onion, causes bacterial panicle blight and sheath rot. Based on the complete genome sequence of B. gladioli BSR3 isolated from infected rice sheaths, the genome of B. gladioli BSR3 contains the luxI/luxR family of genes. Members of this family encode N-acyl-homoserine lactone (AHL) quorum sensing (QS) signal synthase and the LuxR-family AHL signal receptor, which are similar to B. glumae BGR1. In B. glumae, QS has been shown to play pivotal roles in many bacterial behaviors. In this study, we compared the QS-dependent gene expression between B. gladioli BSR3 and a QS-defective B. gladioli BSR3 mutant in two different culture states (10 and 24 h after incubation, corresponding to an exponential phase and a stationary phase) using RNA sequencing (RNA-seq). RNA-seq analyses including gene ontology and pathway enrichment revealed that the B. gladioli BSR3 QS system regulates genes related to motility, toxin production, and oxalogenesis, which were previously reported in B. glumae. Moreover, the uncharacterized polyketide biosynthesis is activated by QS, which was not detected in B. glumae. Thus, we observed not only common QS-dependent genes between B. glumae BGR1 and B. gladioli BSR3, but also unique QS-dependent genes in B. gladioli BSR3.

• Molecules and Cells
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• 제42권2호
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• pp.135-142
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• 2019

OCT4, also known as POU5F1 (POU domain class 5 transcription factor 1), is a transcription factor that acts as a master regulator of pluripotency in embryonic stem cells and is one of the reprogramming factors required for generating induced pluripotent stem cells. The human OCT4 encodes three isoforms, OCT4A, OCT4B, and OCT4B1, which are generated by alternative splicing. Currently, the functions and expression patterns of OCT4B remain largely unknown in malignancies, especially in human glioblastomas. Here, we demonstrated the function of OCT4B in human glioblastomas. Among the isoform of OCT4B, OCT4B-190 ($OCT4B^{19kDa}$) was highly expressed in human glioblastoma stem cells and glioblastoma cells and was mainly detected in the cytoplasm rather than the nucleus. Overexpression of $OCT4B^{19kDa}$ promoted colony formation of glioblastoma cells when grown in soft agar culture conditions. Clinical data analysis revealed that patients with gliomas that expressed OCT4B at high levels had a poorer prognosis than patients with gliomas that expressed OCT4B at low levels. Thus, $OCT4B^{19kDa}$ may play a crucial role in regulating cancer cell survival and adaption in a rigid environment.

• Molecules and Cells
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• 제46권7호
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• pp.430-440
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• 2023

Linear ubiquitin chain assembly complex (LUBAC) is a ubiquitin E3 ligase complex composed of HOIP, HOIL-1L, and SHARPIN that catalyzes the formation of linear/M1-linked ubiquitin chain. It has been shown to play a pivotal role in the nuclear factor (NF)-κB signaling induced by proinflammatory stimuli. Here, we found that tumor susceptibility gene (TSG101) physically interacts with HOIP, a catalytic component of LUBAC, and potentiates LUBAC activity. Depletion of TSG101 expression by RNA interference decreased TNFα-induced linear ubiquitination and the formation of TNFα receptor 1 signaling complex (TNF-RSC). Furthermore, TSG101 facilitated the TNFα-induced stimulation of the NF-κB pathway. Thus, we suggest that TSG101 functions as a positive modulator of HOIP that mediates TNFα-induced NF-κB signaling pathway.

• 생명과학회지
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• 제27권5호
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• pp.567-574
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• 2017

본 연구는 막걸리로부터 ${\gamma}$-amino butyric acid (GABA) 생성 유산균을 분리 및 동정하고 최적 GABA 생산조건을 확립하는데 그 목적이 있다. 막걸리로부터 64균주의 유산균은 MRS 배지에서 성장된 집락의 색과 모양의 특성에 따라 분리하였다. 분리균주의 GABA 생산은 1% MSG가 첨가된 MRS 액체배지에서 배양하여 TLC와 HPLC 방법에 의해 평가되었다. B-134 균주는 GABA생성을 위한 우수균주로 선발하였다. 16S rRNA 유전자 및 glutamate decarboxylase B (gadB) 유전자의 염기서열분석을 통하여, B-134 균주는 Lactobacillus plantarum subsp. plantarum B-134 균주로 명명하였다. GABA 생성을 위한 온도, pH, NaCl 및 MSG 농도를 달리하여 최적배양조건을 조사하였다. 그 결과 B-134 균주의 최적배양 조건은 온도 $37^{\circ}C$, pH 5.7, NaCl 농도 0% (w/v), 그리고 MSG 농도 3% (w/v)로 결정되었으며 본 조건에서 48시간 배양시 25 mM의 GABA를 생산하였다. 이러한 결과로부터 B-134 균주는 GABA함유 건강기능식품개발을 위한 유용한 균주로 판단된다.

• 생명과학회지
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• 제22권9호
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• pp.1201-1206
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• 2012

Crlz1 유전자는 B 세포 분화 과정 중 pre-B 세포 분화 단계에서 특이적으로 발현됨이 밝혀져 있다. Crlz1 유전자의 발현과 연관되는 3개의 DNase I hypersensitive site (HSS8, 9, 10)가 Crlz1 유전자의 전사 시작점으로부터 바로 위쪽의 chromatin 상에서 발견되었고, 그 중에서 HSS9/10은 Crlz1 promoter 지역에 해당하며 매우 높은 전사 활성을 가지는 것으로 이미 보고 되었다. 본 연구에서는 앞의 연구에서 더 나아가 HSS8이 Crlz1 promoter의 전사활성을 약 2 배 증가시키는 enhancer의 역할을 하고 있는 현상을 밝혔으며, 또한 HSS8의 위치가 Crlz1 유전자의 전사 시작점을 기준으로 하였을 때 -1055와 -1159 사이, 즉 104 bp 길이의 chromatin DNA 상에 존재하며, 이러한 HSS8의 위치는 luciferase reporter의 활성 측정으로 비교 분석되어진 deletion construct들의 전사 활성에 대한 결과와도 잘 부합되었다.