• Journal of Microbiology and Biotechnology
• /
• 제7권2호
• /
• pp.132-137
• /
• 1997

A novel protein (HEAAE, High Essential Amino Acid Encoding Protein), rich in essential amino acids ($75{\%}$ of total), was designed and constructed in our laboratory. The designed peptides were analyzed by SYBLE and stable secondary and tertiary structures were predicted. The monomeric form (HEAAE-1) of the protein consists of 20 amino acid residues with four additional amino acids comprising a potential ${\beta}$-turn (HEAAE-4). Size exclusion analysis demonstrated that the monomer is self-aggregates in aqueous solution to form higher ordered multimeric structures, which are very reminiscent of natural plant storage proteins. The DNA encoding this amino acid sequence was synthesized, and from this monomeric gene fragment (heaae-1), the stable tetrameric form of the gene (heaae-4) was generated by subcloning into the E. coli expression vector pKK223-3. A clear 6 kDa polypeptide band corresponding to the molecular weight of the dimeric form (HEAAE-2) was detected. The smeared band which appeared around the molecular weight corresponding to HEAAE-4 of 11 kDa suggested that the tetramer form of this protein might be processed into smaller size products.

• KSBB Journal
• /
• 제7권3호
• /
• pp.155-160
• /
• 1992

식량으로 쓰이는 식물 단백질은 공통적으로 Isoleucine, Lysine, Methionine, Threonine, Tryptoplan등 5가지 필수아미노산이 결핍되어있다. 본 연구에서는 이러한 필수아미노산을 다량 함유한 단백질을 발현시킬 수 있는 합성유전자를 fekaqo에서 높은 수준으로 발현시키고자 강한 식물 promoter로 알려진 CaMV 35S, CaMV duplicate 35S promoters를 사용하였다. 형질 전환 및 재분화된 식물을 분석한 결과 본 합성 유전자가 식물 nuclear genome 안으로 도입을 안정하여 잘되었고 mRNA수준까지는 유의적인 증가를 보였으나 단백질 수준에서는 유의적 수준의 증가를 관찰할 수 없었다.

• BMB Reports
• /
• 제38권1호
• /
• pp.49-57
• /
• 2005

Major Royal Jelly Protein cDNAs of Apis cerana (AcMRJP) were cloned and characterized. The open reading frames (ORFs) of the AcMRJP1 and AcMRJP2 genes were 1302 and 1392 nucleotides, encoding 433 and 463 amino acid residues, respectively. The sequence divergences between AcMRJP1 and AcMRJP2 and their corresponding protein families in A. mellifera were 0.0618 and 0.0934 at the nucleotide level and 0.0912 and 0.1438 at the protein level, respectively. Phylogenetic analysis supports the orthologous similarity between these proteins. The deduced amino acids indicated high essential amino acid contents of AcMRJP1 and AcMRJP2 (47.5 and 44.8%, respectively). The genomic organization of both AcMRJP1 and AcMRJP2 was determined. Both the AcMRJP1 (3663 bp) and AcMRJP2 (3963 bp) genes contained six exons and five introns, where all boundaries conformed to the GT/AG rule. AcMRJP1 and AcMRJP2 cDNAs were cloned into pET17b, and both the recombinant (r) AcMRJP1 (47.9 kDa) and rAcMRJP2 (51.7 kDa) were expressed in the insoluble form. Western blot analysis and N-terminal sequencing of the solubilized proteins revealed successful expression of rAcMRJP1 and rAcMRJP2 in vitro. The yields of the purified rAcMRJP1 and rAcMRJP2 were approximately 20 and 8mg protein per liter of the flask culture, respectively.

• Journal of Microbiology
• /
• 제45권2호
• /
• pp.153-157
• /
• 2007

5-enolpyruvylshikimate-3-phosphate synthase (EPSP synthase, EC 2.5.1.19) is the sixth enzyme in the shikimate pathway which is essential for the synthesis of aromatic amino acids and many secondary metabolites. The enzyme is widely involved in glyphosate tolerant transgenic plants because it is the primary target of the nonselective herbicide glyphosate. In this study, the Dunaliella salina EPSP synthase gene was cloned by RT-PCR approach. It contains an open reading frame encoding a protein of 514 amino acids with a calculated molecular weight of 54.6 KDa. The derived amino acid sequence showed high homology with other EPSP synthases. The Dunaliella salina EPSP synthase gene was expressed in Escherichia coli and the recombinant EPSP synthase were identified by functional complementation assay.

• Journal of Plant Biotechnology
• /
• 제30권2호
• /
• pp.135-141
• /
• 2003

Peroxiredoxin(Pix) are large family of peroxidases that reduce alkyl hydroperoxides and hydrogen peroxide. A cDNA clone (referred to as swPrxl) encoding Pix was from a sweetpotato cDNA library constructed from suspension-sultured cells, and its expression was investigated in terms of stress. The swPrxl contained an open reading frame (ORF) encoding mature protein of 193 amino acids with calculated molecular mass of 20.8kDa. The predicted amino acid sequence of swPrxl has two conserved cysteines that are essential resicues for the reduction of peroxides. It showed high amino acid sequence homology ot PixIIF of Arabidopsis (77%) and putative Prx of rice(72%). RNA gel-blot analysis showed that swPrxl gene was expressed dominantly in leave among intact tissues, and also highly detect in suspension-cultured cells. Interestingly, the level of swPrxl transcripts was almost the same regardless of the growth stage in suspension culture. Furthermore, the transcription level of swPrxl gene was not significantly changed in response to various stress treatments such as wounding, extreme temperature and stress-related chemicals RT-PCR analyses.

• 한국초지조사료학회지
• /
• 제22권1호
• /
• pp.51-58
• /
• 2002

식물의 광합성에 관여하는 광계 I의 protein subunit들의 연구는 최근까지도 극히 미약한 실정이며, 각각의 subunit들의 특성 또한 일부만이 밝혀져 있다. 본 연구진은 배추의 cDNA library로부터 식물에만 존재하는 subunit 중의 하나인, PSI-H subunit을 암호화하는 유전자인 bpsaH를 분리하였다. 이 유전자는 총 633 bp의 염기로 구성되어 있으며, 염기서열로부터 추정되는 분자량은 약 15,400이었고 등전점은 9.91이었다. 배추 PSI-H subunit의 아미노산 서열을 다른 식물체 유래의 단백질들과 비교분석한 결과, 시금치의 PSI-H와 가장 높은 유사성 (79.3%)을 나타내었다. 또한 bpsaH의 조직 특이적 발현 양상을 조사한 결과, 광합성 조직인 잎에서는 강하게 발현된 반면 꽃봉우리에서는 약하게 발현되었으며, 비광합성 조직인 뿌리에서는 전혀 발현되지 않았다.

• 생명과학회지
• /
• 제31권7호
• /
• pp.671-676
• /
• 2021

쌍별 귀뚜라미(Gryllus bimaculatus)에서 lethal (2) essential for life [l(2)efl]을 코드한 cDNA를 분리하여 GBl(2)efl이라 하였다. GBl(2)efl는 N-glycosylation 한곳과 phosphorylation site를 15곳 가진 189 aa로 구성되며6.2등전점과 21.19 kDa 분자량을 가진다. GBl(2)efl 단백질의 이차구조는 random coils (56.08%), alpha-helix (22.22%), extended strands (17.99%), beta turns (3.7%)로 이루어진다. GBl(2)efl 는 지금까지 보고된 l(2)efl들과는48-69%의 상동성을 보인다. GBl(2)efl은1일, 3일 starvation일때에 각각 dorsal longitudinal flight muscle과 Malpighian tubules에서 mRNA발현이 증가하였다. 한편, ER stress 조건에서는GBl(2)efl 발현은 fat body에서 증가하였다. 본 연구는 곤충의 생존에 기여하는 생리학적 메커니즘을 이해와 효과적인 해충 관리 통제를 수행할 수 있는 능력을 향상에 많은 힌트를 줄 수 있는 실마리를 제공할 수 있을 것이다.