• 제목/요약/키워드: GH Characterization

검색결과 51건 처리시간 0.023초

Cloning, Expression, and Characterization of a Glycoside Hydrolase Family 118 ${\beta}$-Agarase from Agarivorans sp. JA-1

  • Lee, Dong-Geun;Jeon, Myong Je;Lee, Sang-Hyeon
    • Journal of Microbiology and Biotechnology
    • /
    • 제22권12호
    • /
    • pp.1692-1697
    • /
    • 2012
  • We report a glycoside hydrolase (GH)-118 ${\beta}$-agarase from a strain of Agarivorans, in which we previously reported recombinant expression and characterization of the GH-50 ${\beta}$-agarase. The GH comprised an open reading frame of 1,437 base pairs, which encoded a protein of 52,580 daltons consisting of 478 amino acid residues. Assessment of the entire sequence showed that the enzyme had 97% nucleotide and 99% amino acid sequence similarities to those of GH-118 ${\beta}$-agarase from Pseudoalteromonas sp. CY24, which belongs to a different order within the same class. The gene corresponding to a mature protein of 440 amino acids was inserted, recombinantly expressed in Escherichia coli, and purified to homogeneity with affinity chromatography. It had maximal activity at $35^{\circ}C$ and pH 7.0 and had 208.1 units/mg in the presence of 300 mM NaCl and 1 mM $CaCl_2$. More than 80% activity was maintained after 2 h exposure to $35^{\circ}C$; however, < 40% activity remained at $45^{\circ}C$. The enzyme hydrolyzed agarose to yield neoagarooctaose as the main product. This enzyme could be useful for industrial production of functional neoagarooligosaccharides.

고정화 Aminopeptidase M에 의해 메치오닐 인간성장호르몬으로부터 전환된 천연형 인간성장호르몬의 정제 및 특성 확인 (Purification and Characterization of Authentic Human Growth Hormone Converted from Methionyl Human Growth Hormone by Immobilized Aminopeptidase M)

  • 이성희;조영우
    • KSBB Journal
    • /
    • 제10권3호
    • /
    • pp.271-282
    • /
    • 1995
  • met-hGH로부터 고정화 ApM에 의해 전환된 천 연형 hGH를 등전위점, 소수성, 전하량의 차이에 따라 3회의 일련의 크로마토그래피를 수행하여 정제하고, 정제된 hGH의 특성을 조사하였다. 정제한 hGH의 비활성은 효소면역측정법으로 분석하였을 때 2 2.75IUjmg이었고, hGH 회수율은 14.1%이었다. 정제한 재조합 hGH는 아미노산 조성, 아미노 말단의 15개의 아미노산 서열 분석, 카르복시 말단의 아미노산 분석, 트럽신 가수분해 랩타이드들의 HPLC 분석등을 통해 아미노말단 에치오닌이 제거된 천연 형 hGH임을 알 수 있었고, SDS-PAGE, native­P PAGE, IEF, RP-HPLC, HSGF 등의 분석 결과 정제한 hGH는 상용품보다 순도가 높다는 것을 알 수 있었으며, 뇌하수체 제거 쥐의 체중 증가와 경골성 장폭의 증가를 통한 활성 측정 결과 정제한 hGH는 상용 hGH와 같은 정도의 활성을 냐타내었으며 우혈청 알부민을 주사한 대조군에 비해 뚜렷한 성장 효 과를 나타냈다. 따라서 본 연구에셔 정제한 hGH는 천연형이며, 높은 순도와 우수한 생리활성을 나타내는 것을 알 수 있었다.

  • PDF

Characterization of the rhGH released from rhGH-loaded PLGA microspheres

  • Jo, Yeong-Woo;Lee, Ghun-Il;Park, Yong-Man;Yang, Hi-Chang;Kim, Mi-Ryang;Lee, Sung-Hee;Kwon, Jong-Won;Kim, Won-Bae;Choi, Eung-Chil
    • 대한약학회:학술대회논문집
    • /
    • 대한약학회 2002년도 Proceedings of the Convention of the Pharmaceutical Society of Korea Vol.2
    • /
    • pp.417.1-417.1
    • /
    • 2002
  • The in vitro release of rhGH from PLGA microspheres was characterized. rhGH-loaded PLGA microspheres were prepared with 50:50 poly(D.L-lactide-co-glycolide) (PLGA) polymers using a double emulsion process. To simulate rhGH release under physiological conditions. the microspheres were suspended in a physiological buller at 37$^{\circ}C$. Quantification of the rhGH released and its molecular form analysis were carried out using SE-HPLC. (omitted)

  • PDF

Agarivorans sp. JA-1 유래 신규 GH-16 β-agarase의 클로닝, 발현 및 특성 (Cloning, Expression, and Characterization of a Novel GH-16 β-Agarase from Agarivorans sp. JA-1)

  • 전명제;김아람;이동근;이상현
    • 생명과학회지
    • /
    • 제22권11호
    • /
    • pp.1545-1551
    • /
    • 2012
  • 이전 연구에서 저자들이 Glycoside hydrolase family 50 (GH-50)과 GH-118 ${\beta}$-agarase들의 발현과 특성을 보고한 Agarivorans sp. JA-1 균주로부터 신규의 GH-16 ${\beta}$-agarase를 보고하고자 한다. 본 유전자는 1,362 염기쌍으로 구성되어 있으며, 453 아미노산 잔기로 구성된 49,830 Da의 단백질을 암호화한다. 본 효소는 Pseudoalteromonas sp. CY24 유래의 GH-16 ${\beta}$-agarase와 98%의 염기서열 상동성과 99%의 아미노산서열 상동성을 나타냈다. 신호서열을 제외한 429 아미노산으로 구성된 성숙단백질에 해당하는 유전자를 E. coli BL21 (DE3) 세포에서 재조합 발현시킨 후, 친화성 크로마토그래피로 효소를 정제하였다. 정제된 효소는 $40^{\circ}C$와 pH 5.0에서 67.6 U/mg의 최적 활성을 보였다. 아가로스를 기질로 한 효소분해산물의 박막크로마토그래피 분석결과, neoagarohexaose와 neoagarotetraose가 주산물로 생산되는 것을 알 수 있었다. 본 효소는 기능성 한천올리고당의 산업적 생산에 활용 가능할 것으로 기대된다.

Cellvibrio sp. KY-GH-1의 아가로오스 당화 관련 엑소형 GH50A β-아가레이즈와 GH117A α-NABH의 특성 및 NA2와 L-AHG 양산에의 적용 가능성 (Characterization of Exolytic GH50A β-Agarase and GH117A α-NABH Involved in Agarose Saccharification of Cellvibrio sp. KY-GH-1 and Possible Application to Mass Production of NA2 and L-AHG)

  • 장원영;이희경;김영호
    • 생명과학회지
    • /
    • 제31권3호
    • /
    • pp.356-365
    • /
    • 2021
  • 최근, 본 연구진은 담수 환경 유래 한천 분해 세균인 Cellvibrio sp KY-GH-1 (KCTC13629BP)의 전체 유전체 염기 서열을 분석하여 아가로오스를 L-AHG 및 D-갈락토오스로 가수분해시키는 아가레이즈들을 암호화하는 유전 정보를 탐색하였다. 그 결과, KY-GH-1 균주는 유전체 상의 약 77 kb 길이의 아가레이즈 유전자 클러스터 내에 9개의 β-아가레이즈 유전자들과 2개의 α-네오아가로비오스 가수분해효소(α-NABH) 유전자들을 지닌 것으로 나타났다. 이러한 유전자 정보를 바탕으로 KY-GH-1 균주가 한천을 탄소원으로 자화하기 위해 단량체인 L-AHG와 D-갈락토오스로 분해시키는 공정은, 엔도형 GH16 β-아가레이즈, 엔도형 GH86 β-아가레이즈 등에 의해 개시되어 NA4, NA6, NA8 등을 생성시킨 후, 이들에 대해 엑소형 GH50 β-아가레이즈가 추가로 작용하여 NA2를 생성시키고, 이어서 GH117 α-NABH가 작용하여 생성된 NA2를 단량체 L-AHG와 D-갈락토오스로 분해함으로써 종결되는 것으로 예측되었다. 대장균 발현 시스템과 PET-30a 벡터를 함께 사용하여, KY-GH-1 균주 유래의 GH50 패밀리 β-아가레이즈 유전자들(GH50A, GH50B, GH50C)과 GH117 패밀리 α-NABH 유전자들(GH117A α-NABH, GH117B α- NABH)을 발현시켜 His-태그 재조합 효소단백질들로 확보하여, 이들 효소단백질을 이용하여 효소 활성을 비교 분석한 결과, 재조합 GH50A β-아가레이즈가 세 개의 GH50A 패밀리 β-아가레이즈 동위효소들 중에서 가장 높은 엑소형 β-아가레이즈 활성을 나타내며, 또한 재조합 GH117A α-NABH가 NA2를 L-AHG와 D-갈락토오스로 강력하게 가수분해할 수 있으나 재조합 GH117B α-NABH는 NA2 가수분해 활성이 없음을 확인하였다. 연이어 GH50A β-아가레이즈 및 GH117A α-NABH의 효소 특성을 추가로 조사하였다. 아울러 이들 각 효소가 나타내는, 아가로오스를 분해하여 NA2를 생성시키는 효율성과 NA2를 분해하여 L-AHG 및 D-갈락토오스를 생성시키는 효율성을 평가하였다. 본 총설에서는, L-AHG 및 D-갈락토오스의 양산을 위한 아가로오스의 효소적 가수분해에 성공적으로 활용될 수 있을 것으로 기대되는, 담수 유래 한천 분해 세균 Cellvibrio sp. KY-GH-1 유래의 재조합 GH50A β-아가레이즈 및 GH117A α-NABH의 장점들에 대해 기술한다.

Characterization of Double Transgenic Mice Harboring Both Goat $\beta$-casein/hGH and Goat $\beta$-casein/hG-CSF Hybrid Genes

  • Oh, Keon-Bong;Lee, Chul-Sang
    • 한국발생생물학회지:발생과생식
    • /
    • 제13권3호
    • /
    • pp.191-198
    • /
    • 2009
  • In an attempt to simultaneously produce two human proteins, hGH and hG-CSF, in the milk of transgenic mice, we constructed goat $\beta$-casein-directed hGH and hG-CSF expression cassettes individually and generated transgenic mice by co-injecting them into mouse zygotes. Out of 33 transgenic mice, 29 were identified as double transgenic harboring both transgenes on their genome. All analyzed double transgenic females secreted both hGH and hG-CSF in their milks. Concentrations ranged from 2.1 to $12.4\;mg/m{\ell}$ for hGH and from 0.04 to $0.13\;mg/m{\ell}$ for hG-CSF. hG-CSF level was much lower than hGH level but very similar to that of single hG-CSF mice, which were introduced with hG-CSF cassette alone. In order to address the causes of concentration difference between hGH and hG-CSF in milk, we examined mRNA level of hGH and hG-CSF in the mammary glands of double transgenic mice and tissue specificity of hG-CSF mRNA expression in both double and single transgenic mice. Likewise protein levels in milk, hGH mRNA level was much higher than hG-CSF mRNA, and hG-CSF mRNA expression was definitely specific to the mammary glands of both double and single transgenic mice. These results demonstrated that two transgenes have distinct transcriptional potentials without interaction each other in double transgenic mice although two transgenes co-integrated into same genomic sites and their expressions were directed by the same goat $\beta$-casein promoter. Therefore goat $\beta$-casein promoter is very useful for the multiple production of human proteins in the milk of transgenic animals.

  • PDF

Characterization of Growth Hormone Secretion to Growth Hormone releasing Peptide-2 in Domestic Animals - A Review

  • Roh, Sang-Gun;Lee, Hong-Gu;Phung, Long Thang;Hidari, Hisashi
    • Asian-Australasian Journal of Animal Sciences
    • /
    • 제15권5호
    • /
    • pp.757-766
    • /
    • 2002
  • Growth hormone-releasing peptide-2 (GHRP-2, also named KP102) is a new hexapeptide of a series of synthetic growth hormone-releasing peptides (GHRPs) which stimulates the secretion of growth hormone (GH) in vitro and in vivo in several species including calf, sheep and pig. The GH-releasing activity of GHRP-2 is two to three times more effective than that of the original GHRP-6, and GHRP-1 in the rats and humans. To date, GHRP-2 seems to be the most potent member of the family of GHRPs. Since the GHRPs are short peptides (5-7 amino acid residues), they are synthesized easily and are not as readily degraded in plasma as GHreleasing hormone (GHRH). These features ameliorate their potential on domestic animals because of their chemical nature the GHRPs are efficacious when administered i.v. orally or orally. However, studies in cow, pig and sheep do not indicate such a close relationship between GHRH, somatostatin (SS) and GH, calling into question the general applicability of the human and rat models. Perhaps there is an important role for an endogenous GHRP in the regulation of GH secretion in domestic animals. This review provides an overview on the current knowledge of physiological role of GHRP-2 in domestic animals.

Paenibacillus amylolyticus 유래 xylanase GH10 및 GH30의 xylan 가수분해 특성 (Enzymatic characterization of Paenibacillus amylolyticus xylanases GH10 and GH30 for xylan hydrolysis)

  • 남경화;장명운;김민정;이정민;이민재;김태집
    • 미생물학회지
    • /
    • 제52권4호
    • /
    • pp.463-470
    • /
    • 2016
  • Xylan의 효소적 가수분해는 고부가가치 기능성 물질 또는 바이오에너지 생산을 위한 발효성 당을 얻는 가장 유용한 방법 중 하나이다. endo-${\beta}$-Xylanase는 xylan 주사슬 내부의 ${\beta}$-1,4-결합을 가수분해하여 xylobiose, xylotriose를 포함한 다양한 XOS를 생산하는 핵심 효소이다. 이들 효소 중에서 glucuronoxylanase GH30은 methylglucuronic acid가 측쇄에 수식된 xylan에 특이적으로 작용한다. 본 연구에서는 Paenibacillus amylolyticus KCTC 3005에서 유래한 2종의 xylan 가수분해효소(PaXN_10과 PaGuXN_30) 유전자를 클로닝하고, Escherichia coli에서 각각 발현시켰다. PaXN_10 (38.7 kDa)은 ${\beta}$-xylanase GH10 계열, PaGuXN_30 (58.5 kDa)은 glucuronoxylanase GH30에 해당하는 효소이며, $50^{\circ}C$와 pH 7.0에서 최대 활성을 나타내었다. 가수분해 특성 연구를 통해 P. amylolyticus가 목질계 glucuronoxylan을 분해하는 효소 시스템을 제안하였다. 세포 외로 분비되는 PaGuXN_30은 glucuroxylan을 가수분해하여 methylglucuronic acid 측쇄를 가지는 다양한 aldouronic acid mixtures를 생성하며, 이러한 분해산물은 세포 내로 이동하여 PaXN_GH10에 의해 xylose, xylobiose와 같은 저분자 XOS로 분해되어 세포 내 대사경로에 이용될 수 있다. 또한 이들 효소의 가수분해특성을 이용하여 다양한 탄수화물 소재 생산이 가능할 것으로 기대한다.

Molecular Characterization of a Transient Expression Gene Encoding for 1-Aminocyclopropane-1-carboxylate Synthase in Cotton (Gossypium hirsutum L.)

  • Wang, Xia;Zhang, Ying;Zhang, Jiedao;Cheng, Cheng;Guo, Xingqi
    • BMB Reports
    • /
    • 제40권5호
    • /
    • pp.791-800
    • /
    • 2007
  • Ethylene performs an important function in plant growth and development. 1-aminocyclopropane-1-carboxylate (ACC) synthase (ACS), the key enzyme involved in ethylene biosynthesis, has been the focus of most ethylene studies. Here, a cotton ACS gene referred to as Gossypium hirsutum ACS1 (GhACS1), was isolated. The full-length cDNA of GhACS1 encodes for a 476-amino acid protein which harbors seven conserved regions, 11 invariant amino acid residues, and the PLP binding active site, all of which characterize ACC synthases. Alignment analysis showed that GhACS1 shared a high degree of identity with other known ACC synthases from different species. Two introns were detected in the genomic DNA sequence, and the results of Southern blot analysis suggested that there might be a multi-gene family encoding for ACC synthase in cotton. From the phylogenetic tree constructed with 24 different kinds of ACC synthases, we determined that GhACS1 falls into group II, and was closely associated with the wound-inducible ACS of citrus. The analysis of the 5' flanking region of GhACS1 revealed a group of putative cis-acting elements. The results of expression analysis showed that GhACS1 displayed its transient expression nature after wounding, abscisic acid (ABA), and $CuCl_2$ treatments. These results indicate that GhACS1, which was transiently expressed in response to certain stimuli, may be involved in the production of ethylene for the transmission of stress signals.

가스하이드레이트 시험생산 기술개발 동향 (An Investigation on the Technical Progress of Test Production for Gas Hydrate Development)

  • 박승수;주우성;안승희;이정환
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 한국신재생에너지학회 2009년도 춘계학술대회 논문집
    • /
    • pp.705-708
    • /
    • 2009
  • For the Gas hydrate Research and Development in Korea, the prospect area I & II was surveyed and drilled during the first phase. At the result, we succeeded to discovering gas hydrate real sample at BSR reflection and vent structure. This expedition processing contributes to developing the offshore seismic survey technologies and data processing of Korea. But Korean gas hydrate test production research, in spite of activating test production at other countries, is such a limitation about technician, GH production technologies and E&P processing. First of all, there is no exist in Korea to application site for the their production research results. In this paper, we have studied the gas hydrate reservoir selection technics of the DOE & BPXA for the ANS test production. And this result will helpful to preparation of gas hydrate test production in Korea.

  • PDF