• 제목/요약/키워드: 10-arginine tag

검색결과 7건 처리시간 0.019초

D-xylose에서 D-xylulose로의 전환을 위한 D-xylose Isomerase의 정전기적 고정화 (Electrostatic Immobilization of D-Xylose Isomerase to a Cation Exchanger for the Conversion of D-Xylose to D-Xylulose)

  • 항누엔티;김성건;권대혁
    • 한국미생물·생명공학회지
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    • 제40권2호
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    • pp.163-167
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    • 2012
  • D-Xylose는 Saccharomyces cerevisiae에서 기질로 이용될 수 없어 S. cerevisiae가 이용 가능한 D-xylulose로의 전환이 요구된다. 효소고정화 시스템을 통한 D-xylose로부터 D-xylulose로의 전환을 위해 대장균의 D-xylose 이성화효소(XI)의 카르복시 말단에 양이온 교환수지를 이용한 단순 정제 및 고정화가 가능하도록 10-arginine tag(R10)을 융합하였다. 융합단백질인 XIR10은 재조합 대장균에서 과잉발현되었고 단일 단계의 양이온 교환 크로마토그라피를 통하여 고순도로 정제되었다. 정제된 XIR10은 카르복시 말단의 10-arginine tag과의 정전기적 상호작용을 통하여 양이온 교환수지에 고정화되었다. 고정화 및 비고정화된 XIR10은 넓은 범위의 pH 및 온도에서 비슷한 D-xylose 이성화효소 활성을 보였다. 이 결과는 양이온 교환수지로의 고정화는 XIR10의 효소적 기능에 영향을 주지 않는다는 것을 나타낸다. 고정화된 XIR10의 최적화된 조건에서 D-xylose의 25%는 D-xylulose로 이성화되었다. 본 연구의 결과들은 10-arginine tag과 양이온 교환수지간의 상호작용을 통해 정전기적 고정화된 XIR10이 D-xylose로부터 D-xylulose로의 전환에 응용 가능하다는 것을 명확하게 보여주었다.

Expression of Enzymatically-active Phospholipase Cγ2 in E.coli

  • Ozdener, Fatih;Kunapuli, Satya P.;Daniel, James L.
    • BMB Reports
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    • 제35권5호
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    • pp.508-512
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    • 2002
  • Phospholipase C-gamma-2 ($PLC{\gamma}2$) activation is a key signaling event for many cell functions. In order to delineate the pathways that lead to $PLC{\gamma}2$ activation, we devised a quick method for obtaining sufficient $PLC{\gamma}2$. We obtained the full-length cDNA for human $PLC{\gamma}2$ and expressed it in E. coli using the expression vector pT5T. To enhance the protein expression, tandem AGG-AGG arginine codons at the amino acid positions 1204-1205 were replaced by CGG-CGG arginine codons. The protein expression was detected in a Western blot analysis by both anti-$PLC{\gamma}2$ antibodies and the antibodies that are raised against the tripeptide epitope (Glu-Glu-Phe) tag that are genetically-engineered to its carboxyl terminal. Crude lysates that were prepared from bacteria that express $PLC{\gamma}2$ were found to catalyze the hydrolysis of phosphatidylinositol 4,5 bisphosphate. Similar to previous reports on $PLC{\gamma}2$ that is isolated from mammalian tissue, the recombinant enzyme was $Ca^{2+}$ dependent with optimal activity at 1-10 uM $Ca^{2+}$.

동양달팽이(Nesiohelix samarangae)의 arginine kinase 유전자 분석 및 발현 패턴에 관한 연구 (Identification, sequence characterization and expression analysis of the arginine kinase gene in response to laminarin challenge from the Oriental land snail, Nesiohelix samarangae)

  • 정지은;이용석
    • 한국패류학회지
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    • 제29권3호
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    • pp.171-179
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    • 2013
  • 동양달팽이의 arginine kinase 유전자는 염기서열 1065개로 이루어져있으며 355개의 아미노산으로 이루어져 있으며, BLAST 결과를 토대로 유사도가 높은 25개의 참고 서열과 동양달팽이의 arginine kinase의 아미노산 서열을 MEGA5 프로그램의 clustalW 모듈을 이용하여 multiple sequence alignment 를 수행한 결과, 연체동물문에 속하는 복족강 (5종), 두족강 (5종), 이매패강 (4종) 등에 속하는 생물들이 같은 군으로 묶였으며, 절지동물문 곤충강 에 속하는 나비목 (2종), 벌목 (1종), 노린재목 (2종) 등에 속하는 생물들이 같은 군으로 묶이고, 갑각강 (5종), 거미강 (1종) 에 속하는 생물들이 묶이는 것을 알 수 있었다. Psipred 소프트웨어를 통해 2D 구조를 비교 분석한 결과도 multiple align 및 phylodendrogram 결과와 밀접한 관계가 있음을 알 수 있었다. 시간에 따른 arginine kinase의 발현양상을 확인한 결과 control에 비하여 6시간에서 약 1.2배 정도 발현이 증가하는 것을 확인할 수 있었으며, 12시간이 지나면 점차 감소하는 것을 확인할 수 있었다. EST를 통해 밝혀진 N. samarangae 의 Ark 서열은 근연종들의 서열과 일치함을 알 수 있었으며, 본 연구 결과를 통해 무척추동물에서의 선천성 면역 관련 유전자 연구에 동양달팽이가 좋은 모델이 될 수 있음을 제시하고 있다.

Addition of an N-Terminal Poly-Glutamate Fusion Tag Improves Solubility and Production of Recombinant TAT-Cre Recombinase in Escherichia coli

  • Kim, A-Hyeon;Lee, Soohyun;Jeon, Suwon;Kim, Goon-Tae;Lee, Eun Jig;Kim, Daham;Kim, Younggyu;Park, Tae-Sik
    • Journal of Microbiology and Biotechnology
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    • 제30권1호
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    • pp.109-117
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    • 2020
  • Cre recombinase is widely used to manipulate DNA sequences for both in vitro and in vivo research. Attachment of a trans-activator of transcription (TAT) sequence to Cre allows TAT-Cre to penetrate the cell membrane, and the addition of a nuclear localization signal (NLS) helps the enzyme to translocate into the nucleus. Since the yield of recombinant TAT-Cre is limited by formation of inclusion bodies, we hypothesized that the positively charged arginine-rich TAT sequence causes the inclusion body formation, whereas its neutralization by the addition of a negatively charged sequence improves solubility of the protein. To prove this, we neutralized the positively charged TAT sequence by proximally attaching a negatively charged poly-glutamate (E12) sequence. We found that the E12 tag improved the solubility and yield of E12-TAT-NLS-Cre (E12-TAT-Cre) compared with those of TAT-NLS-Cre (TAT-Cre) when expressed in E. coli. Furthermore, the growth of cells expressing E12-TAT-Cre was increased compared with that of the cells expressing TAT-Cre. Efficacy of the purified TAT-Cre was confirmed by a recombination test on a floxed plasmid in a cell-free system and 293 FT cells. Taken together, our results suggest that attachment of the E12 sequence to TAT-Cre improves its solubility during expression in E. coli (possibly by neutralizing the ionic-charge effects of the TAT sequence) and consequently increases the yield. This method can be applied to the production of transducible proteins for research and therapeutic purposes.

The mitochondrial genome of Tremoctopus violaceus (Octopoda, Tremoctopodidae) and its phylogenetic consideration

  • Oh, Dae-Ju;Lee, Jong-Chul;Jung, Yong-Hwan
    • Fisheries and Aquatic Sciences
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    • 제25권3호
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    • pp.158-166
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    • 2022
  • The complete mitochondrial genome of Tremoctopus violaceus was sequenced to analyze its organization and phylogenetic status within the order Octopoda. The mitochondrial genome of T. violaceus had a structure and organization similar to that of other Octopoda. The content of the nucleotides A, C, G, and T was 31.68 %, 7.71 %, 20.02 %, and 40.58 %, respectively. All protein-coding genes (PCG) began with the ATG codon, excluding ND4 and ATP6, which began with ATC and ATT, respectively, and terminated with TAG, TAA, TA, or T. Codons for isoleucine were the most used codons, whereas those for arginine were used the least. Two extra tRNAs, trnN and trnL, were found in the control region. These tRNAs have a D-armless structure. The control region had excess A + T content (83.16 %) and a stem-loop structure with two elements, which is reported for the first time in Octopoda by our study. Bayesian inference using 13 PCG revealed that Octopus and Octopodidae were polyphyletic, and that Tremoctopodidae diverged relatively earlier within Octopoda. The mitochondrial genome of T. violaceus and its characteristics may help to understand the evolutionary history of Octopoda and establish a marine biodiversity conservation strategy.

Molecular Cloning and mRNA Expression of Cytochrome P450 (CYP450)-related Protein in the Pacific Oyster, Crassostrea gigas: A Water Temperature and Time Study

  • Jo, Pil-Gue;Min, Tae-Sun;An, Kwang-Wook;Choi, Cheol-Young
    • Animal cells and systems
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    • 제13권4호
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    • pp.447-452
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    • 2009
  • We cloned the complete complementary DNA (cDNA) of a Pacific oyster (Crassostrea gigas) cytochrome P450 (CYP450)-related protein using rapid amplification of cDNA ends (RACE). The cDNA included a 1470 bp open reading frame that began with the first ATG codon at position 103 bp and ended with a TAG stop codon at position 1573 bp (GenBank accession EF451959). The sequence had all major functional domains and characteristics of previously characterized CYP450 molecules, including the heme-binding region (FGVGRRRCVG) and putative arginine codon (R) integral to enzymatic function. An NCBI/GenBank database comparison to other CYP450 genes revealed that the deduced C. gigas CYP450 amino acid sequence is similar to that of mouse (Mus musculus) CYP450 2D/II (28%, accession AK078880), rabbit (Oryctolagus cuniculus) CYP450 2D/II (28%, AB008785), and white-tufted-ear marmoset (Callithrix jacchus) CYP450 2D (28%, AY082602). Thus, although the C. gigas CYP450 we cloned appears to belong to the 2D type of the CYP450 group, it has low similarity to this type. CYP450 mRNA expression increased over 6 h in C. gigas gills at $30^{\circ}C$ and $10^{\circ}C$, and then decreased, indicating that CYP450 plays an important role in C. gigas exposed to water temperature changes. This finding can be used as a physiological index for Pacific oysters exposed to changing water temperatures.

참굴(Crassostrea gigas)의 BTG1 유전자의 특성 (Cloning and Characterization of BTG-1 Gene from Pacific Oyster (Crassostrea gigas))

  • 정인영;오정환;송영환
    • 생명과학회지
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    • 제27권4호
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    • pp.398-407
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    • 2017
  • BTG1 (B-cell translocation gene 1)은 APRO family (anti-proliferative protein family)에 속하며, 이들은 공통의 생물학적 기능은 세포증식을 억제하는 것으로 알려져 있다. 본 연구에서, 굴의 gill cDNA library를 random sequencing을 통한 EST 분석과정에서 BTG1 clone을 확보하였으며, 분자생물학적 특성을 조사하였다. 굴의 BTG1은 182 개의 아미노산으로 구성되며, zebrafish와 57%, human과 56%의 상동성을 나타냈으며, 사람이나 설치류와 달리 ORF (open reading frame) 내에 intron이 존재하지 않았다. Genomic DNA walking을 통해 굴의 BTG1의 predicted promoter를 확인하였으며, 분석결과 AP-1 element와 SRE (serum response element) 부위가 존재하였으며, 5'flanking region에 cAMP response element (CRE) 부위가 확인되었다. 굴의 BTG1의 조직별 유전자발현 수준을 확인하기 위해 real-time PCR을 수행하였으며, 6 개 조직 모두에서 BTG1의 유전자발현이 나타났으며, 그 중에서 heart와 mantle에서 높은 수준의 mRNA 발현을 확인할 수 있었다.