• 제목/요약/키워드: EGFP gene

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Enhanced p53 Gene Transfer to Human Ovarian Cancer Cells using Cationic Nonviral Vector. DOC

  • Choi, Eun-Jeong;Choi, Sung-Hee;Park, Jeong-Sook;Ahn, Woong-Shick;Kim, Chong-Kook
    • 대한약학회:학술대회논문집
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    • 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
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    • pp.427.2-428
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    • 2002
  • Previously we formulated new cationic liposomes, DDC, composed of DOTAP. DOPE, and cholesterol (Chol) in 1 : 0.7 : 0.3 molar ratios, and showed that DDC efficiently deliver the plasmid DNA into ovarian cancer cell lines. Here, wild type p53 DNA was transfected into ovarian cancer cells, using the DOC as a nonviral vector and the expression and activity of p53 gene were evaluated in vitro and in vivo. The complexes of plasmid DNA (pp53-EGFP) and DDC were transfected into OVCAR-3 cells. The gene expression was determined by RT -PCR and western blot analysis. (omitted)

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The innate immune response transcription factor Bombyx mori Relish1 induces high-level antimicrobial peptides in silkworm

  • Kim, Seong-Wan;Kim, Seong-Ryul;Goo, Tae-Won;Choi, Kwang-Ho
    • International Journal of Industrial Entomology and Biomaterials
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    • 제37권2호
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    • pp.49-54
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    • 2018
  • To artificially enhance antimicrobial peptide expression in Bombyx mori, we constructed genetically engineered silkworms overexpressing Rel family transcription factor. The truncated BmRelish1 (BmRelish1t) gene contained a Rel homolog domain (RHD), nuclear localization signal (NLS), acidic and hydrophobic amino acid (AHAA)-rich region, and death domain (DD), but no ankyrin-repeat (ANK) domain. The BmRelish1t gene was controlled by B. mori cytoplasmic actin 3 promoter in the PiggyBac transposon vector. Chromosome analysis of G1 generations of a transgenic silkworm with EGFP expression confirmed stable insertion of BmRelish1t. BmRelish1t gene overexpression in transgenic silkworms resulted in higher mRNA expression levels of B. mori antimicrobial peptides such as lebocin(~20.5-fold), moricin(~8.7-fold), and nuecin(~17.4-fold) than those in normal silkworms.

멜리틴 항균펩타이드를 생산하는 형질전환누에 (Production of the melittin antimicrobial peptide in transgenic silkworm)

  • 김성완;구태원;김성렬;박승원;최광호
    • 한국잠사곤충학회지
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    • 제53권1호
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    • pp.55-60
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    • 2015
  • 본 연구의 목적은 누에형질전환 기술을 이용하여 누에체액에서 melittin 항균펩타이드를 생산하는 것으로서, 본 실험에서는 누에유래의 액틴3 프로모터를 이용하여 melittin 항균펩타이드를 발현시켰다. 누에형질전환체 선발을 위해서는 3xP3 promoter와 EGFP 유전자를 이용하여 선발하였고, 300개의 누에알에 microinjection 하여 F1 세대에서 11 bloods의 누에형질전환체를 선발하였다. 선발된 누에형질전환체는 초기배 단계의 눈과 신경조직, 유충과 번데기 그리고 성충의 눈에서 EGFP 형광단백질이 발현되는 것을 확인할 수 있었다. 또한 G2 세대 누에형질전환체를 5령 5일 유충까지 사육 후, 체액을 채취한 후 전처리 하였다. 이 시료를 항균활성검정을 하였고, 총 10마리의 누에를 선발할 수 있었다. 이렇게 선발 된 누에는 서로 교배를 통해서 계대사육을 하였다. 이러한 과정으로 선발된 G3세대 누에형질전환체를 이용하여 앞의 과정과 동일한 방법으로 항균할성을 검정하였다. 그 결과 대조군으로 사용된 시그마사의 melittin(0.016 mg/ml)과 거의 동일한 항균활성을 나타내었다. 이상의 결과에서 melittin 항균펩타이드를 생산하는 누에형질전환체가 성공적으로 제작되었음을 확인할 수 있었다.

새로운 스트레스 단백질인 VISP의 세포내 위치 (Subcellular Localization of Novel Stress Protein VISP)

  • 문창훈;윤원준;고명석;김현주;박정우
    • 미생물학회지
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    • 제42권4호
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    • pp.271-276
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    • 2006
  • 이전의 연구 결과 어류 rhabdovirus에 감염된 세포에서 virus-inducible stress protein (VISP)의 발현이 증가함을 확인하였다. 본 연구에서는 VISP의 세포내 위치를 확인하였으며, 또한 세포내 위치 결정에 중요한 역할을 담당하는 VISP의 부위를 확인하였다. 먼저 endogenous VISP의 세포내 위치를 확인하기 위하여 CHSE-214 세포를 VISP에 대한 단클론항체를 사용하여 염색한 후 confocal microscope로 관찰하였다. 그 결과 VISP가 세포의 핵 주변에 점구조를 형성함이 확인되었다. 이를 확인하기 위하여 VISP에 enhanced green fluorescent protein (EGFP)이 붙은 fusion gene을 발현하는 plasmid를 제조하였다. EGFP-VISP를 발현하는 plasmid 벡터를 세포에 transfection 시킨 후 confocal microscope로 관찰한 결과 핵 주변에 점구조를 형성함이 확인되었다. VISP의 아미노산서열 중 핵 주변의 점구조 형성에 관여하는 부분을 확인하기 위하여 VISP의 다양한 deletion mutant들을 제조하였다. 이 mutant를 사용한 transfection 실험 결과 VISP의 C-terminal 부위(aa 612-710)가 핵주변의 점구조 형성에 중요한 역할을 담당함이 확인되었으며, 이 부분의 functional motif 분석결과 691-TLTSLLL-697 부위에 nuclear receptor binding motif가 존재함이 확인되었다. 이와 같은 결과들을 종합하면, VISP는 핵 주변에 존재하며 VISP의 C-terminal부위가 혀 주위 분포에 중요한 역할을 담당함을 알 수 있었다. 이후의 연구로부터 VISP의 핵 주위 분포가 IHNV의 성장에 미치는 영향이 확인되면 IHNV 병원성의 새로운 기작을 밝혀내는 중요한 자료가 될 것이다.

Construction of an Escherichia-Pseudomonas Shuttle Vector Containing an Aminoglycoside Phosphotransferase Gene and a lacZ' Gene for $\alpha$-Complementation

  • Lee, Bheong-Uk;Hong, Ja-Heon;Kahng, Hyung-Yeel;Oh, Kye-Heon
    • Journal of Microbiology
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    • 제44권6호
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    • pp.671-673
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    • 2006
  • A new 4.87 kb Escherichia-Pseudomonas shuttle vector has been constructed by inserting a 1.27 kb DNA fragment with a replication origin of a Pseudomonas plasmid pRO1614 into the 3.6 kb E. coli plasmid pBGS18. This vector, designated pJH1, contains an aminogly-coside phosphotransferase gene (aph) from Tn903, a lacZ' gene for $\alpha$-complementation and a versatile multiple cloning site possessing unique restriction sites for EcoRI, SacI, KpnI, SmaI, BamHI, XbaI, SalI, BspMI, PstI, SphI, and HindIII. When pJH1 was transformed into E. coli DHS${\alpha}$ and into P. putida HK-6, it was episomally and stably maintained in both strains. In addition, the enhanced green fluorescent protein (EGFP) gene which was transcriptionally cloned into pJH1 rendered E. coli cells fluorescence when its transformants were illuminated at 488 nm.

Expression of yeast Hem1 gene controlled by Arabidopsis HemA1 promoter improves salt tolerance in Arabidopsis plants

  • Zhang, Zhi-Ping;Yao, Quan-Hong;Wang, Liang-Ju
    • BMB Reports
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    • 제43권5호
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    • pp.330-336
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    • 2010
  • 5-Aminolevulinate (ALA) is well-known as an essential biosynthetic precursor of all tetrapyrrole compounds, which has been suggested to improve plant salt tolerance by exogenous application. In this work, the gene encoding aminolevulinate synthase (ALA-S) in yeast (Saccharomyces cerevisiae Hem1) was introduced into the genome of Arabidopsis controlled by the Arabidopsis thaliana HemA1 gene promoter. All transgenic lines were able to transcribe the YHem1 gene, especially under light condition. The chimeric protein (YHem1-EGFP) was found co-localizing with the mitochondria in onion epidermal cells. The transgenic Arabidopsis plants could synthesize more endogenous ALA with higher levels of metabolites including chlorophyll and heme. When the $T_2$ homozygous seeds were cultured under NaCl stress, their germination and seedling growth were much better than the wild type. Therefore, introduction of ALA-S gene led to higher level of ALA metabolism with more salt tolerance in higher plants.

Microcontact Printing of Biotin for Selective Immobilization of Streptavidin-fused Proteins and SPR Analysis

  • Lee, Sang-Yup;Park, Jong-Pil;Lee, Seok-Jae;Park, Tae-Jung;Lee, Kyung-Bok;Park, Insung S.;Kim, Min-Gon;Chung, Bong-Hyun
    • Biotechnology and Bioprocess Engineering:BBE
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    • 제9권2호
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    • pp.137-142
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    • 2004
  • In this study, a simple procedure is described for patterning biotin on a glass substrate and then selectively immobilizing proteins of interest onto the biotin-patterned surface. Microcontact printing (CP) was used to generate the micropattern of biotin and to demonstrate the selective immobilization of proteins by using enhanced green fluorescent protein (EGFP) as a model protein, of which the C-terminus was fused to a core streptavidin (cSA) gene of Streptomyces avidinii. Confocal fluorescence microscopy was used to visualize the pattern of the immobilized protein (EGFP-cSA), and surface plasmon resonance was used to characterize biological activity of the immobilized EGFP-cSA. The results suggest that this strategy, which consists of a combination of $\mu$CP and cSA-fused proteins. is an effective way for fabricating biologically active substrates that are suitable for a wide variety of applications. one such being the use in protein-protein assays.

Enhanced Green Fluorescent Protein Gene under the Regulation of Human Oct4 Promoter as a Marker to Identify Reprogramming of Human Fibroblasts

  • Heo, Soon-Young;Ahn, Kwang-Sung;Kang, Jee-Hyun;Shim, Ho-Sup
    • Reproductive and Developmental Biology
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    • 제32권2호
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    • pp.135-140
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    • 2008
  • Recent studies on nuclear transfer and induced pluripotent stem cells have demonstrated that differentiated somatic cells can be returned to the undifferentiated state by reversing their developmental process. These epigenetically reprogrammed somatic cells may again be differentiated into various cell types, and used for cell replacement therapies through autologous transplantation to treat many degenerative diseases. To date, however, reprogramming of somatic cells into undifferentiated cells has been extremely inefficient. Hence, reliable markers to identify the event of reprogramming would assist effective selection of reprogrammed cells. In this study, a transgene construct encoding enhanced green fluorescent protein (EGFP) under the regulation of human Oct4 promoter was developed as a reporter for the reprogramming of somatic cells. Microinjection of the transgene construct into pronuclei of fertilized mouse eggs resulted in the emission of green fluorescence, suggesting that the undifferentiated cytoplasmic environment provided by fertilized eggs induces the expression of EGFP. Next, the transgene construct was introduced into human embryonic fibroblasts, and the nuclei from these cells were transferred into enucleated porcine oocytes. Along with their in vitro development, nuclear transfer embryos emitted green fluorescence, suggesting the reprogramming of donor nuclei in nuclear transfer embryos. The results of the present study demonstrate that expression of the transgene under the regulation of human Oct4 promoter coincides with epigenetic reprogramming, and may be used as a convenient marker that non-invasively reflects reprogramming of somatic cells.

Tetracycline Inducible Retrovirus Vector System에 의한 GFP 유전자의 발현 조절 (Regulation of GFP Expression Using the Tetracycline Inducible Retroviral Vector System)

  • 구본철;권모선;김태완
    • Reproductive and Developmental Biology
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    • 제29권1호
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    • pp.57-62
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    • 2005
  • 본 연구에서는 retrovirus를 이용한 유전자 전이에 있어서 대두되는 큰 문제점의 하나인 외래 유전자의 지속적인 발현으로 인한 개체의 생리적인 손상을 최소화하기 위하여 tetracycline계 물질의 공급 여부에 따라서 발현을 유도적으로 조절할 수 있는 one vector 형태의 Tet-On system을 구축하고자 하였다. 또한 WPRE 서열을 이 vector 상에 도입하여 유도적 조건에서 외래 유전자의 발현이 보다 강하게 일어날 수 있는 효율적인 retrovirus vector system을 확립하고자 하였다. 구축한 각각의 vector system에서 fluorometry와 western blotting을 이용하여 GFP 유전자의 발현 정도를 비교 측정한 결과, RevTRE-EGFP-WPRE-RSVp-rtTA2SM2 virus를 이용하여 유전자를 전이시킨 표적세포에서 GFP의 절대적인 발현량이 가장 큰 것으로 나타났고, 유전자 발현의 turn on/off에 의한 유도율은 RevTRE-EGFP-RSVp-rtTA2SM2-WPRE virus의 경우에서 8∼21배로 가장 높은 것으로 나타났다. 이상의 결과에서 외래 유전자의 발현을 효율적으로 조절할 수 있는 vector system은 WPRE가 rtTA2SM2 서열의 3에 위치한 형태로, 이 system을 이용하여 생산한 고감염가의 virus는 유전자 치료나 형질전환 동물의 생산에 있어서 요구되는 외래 유전자의 발현을 효율적으로 조절할 수 있는 수단이 될 것이다.