• 제목/요약/키워드: acetyltransferase

검색결과 254건 처리시간 0.017초

Cloning and Characterization of the Catalytic Subunit of Human Histone Acetyltransferase, Hat1

  • Chung, Hyo-Young;Suh, Na-Young;Yoon, Jong-Bok
    • BMB Reports
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    • 제31권5호
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    • pp.484-491
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    • 1998
  • Acetylation of lysine residues within the aminoterminal domains of the core histones plays a critical role in chromatin assemhly as well as in regulation of gene expression. To study the biochemical function of histone acetylation, we have cloned a cDNA encoding the catalytic subunit of human histone acetyltransferase, Hat1. Analysis of the predicted amino acid sequence of human Hat1 revealed an open reading frame of 419 amino acids with a calculated molecular mass of 49.5 kDa and an isoelectric point of 5.5. The amino acid sequence of human Hat1 is homologous to those of known and putative Hat1 proteins from various species throughout the entire open reading frame. The recombinant human Hat1 protein expressed in bacteria possesses histone H4 acetyltransferase activity in vitro. Both RbAp46 and RbAp48, which participate in various processes of histone metabolism, enhance the histone acetyltransferase activity of the recombinant human Hat1, indicating that they are both able to functionally interact with the human Hat1 in vitro.

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석창포 헥산 추출물이 Staphylococcus aureus SA2의 Chloramphenicol Acetyltransferase 에 미치는 영향 (Effect of Hexane Extract of Acori graminei Rhizoma on Chloramphenicol Acetyltransferase of Staphylococcus aureus SA2)

  • 문경호;권주열;박민수;김혜경;이정규
    • 약학회지
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    • 제48권1호
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    • pp.30-33
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    • 2004
  • One subfraction from the hexane fraction of Acri graminei Rhizoma, the E4 fraction which is mainly consisted of acorenone, showed a potential inhibitory activity against chloramphenicol acetyltransferase (CAT) of S. aureus SA2 that is a multidrug-resistant strain to 10 usual antibiotics. The combination therapy of this fraction with chloramphenicol resulted in reduction of the minimal inhibitory concentration from 128 $\mu\textrm{g}$/ml to 8 $\mu\textrm{g}$/ml. The E4 fraction also revealed to prevent the induction of CAT from this strain.

Purification and Acetylation of Protein X Subunit of Pyruvate Dehydrogenase Complex (PDC) from Bovine Kidney

  • Ryu, Ryu;Song, Byoung-J.;Hong, Sung-Youl;Huh, Jae-Wook
    • Archives of Pharmacal Research
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    • 제19권6호
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    • pp.502-506
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    • 1996
  • Protein X is one of the subunits of pyruvate dehydrogenase complex. The biological role of this protein has not been fully elucidated, mainly because of the difficulty in its dissociation from the tightly bound dihydrolipoamide acetyltransferase-protein X subcomplex. We have found that the detachment of protein X from acetyltransferase subunit can be easily accomplished by the cycles of freezing and thawing proces. Several lines of evidence including sodium dodecyl sulfate-polyacrylamide gel electrophoresis, N-terminal amino acid sequence analysis and acetylation with $[2^{14}C]$ pyruvate confirmed that the purified protein is protein X. The purified intact form of protein X was acetylated by $[2^{14}C]$ pyruvate in the presence of py-ruvate dehydrogenase subunit.The acetylation efficiency of this protein was lower than that of acetyltransferase and was not affected by the presence of acetyltransferase.

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T7 발현체계에서 chloramphenicol acetyltransferase의 선택적 과잉생산 (Selective overproduction of chloramphenicol acetyltransferase in the T7 expression system)

  • 김한복;강창원
    • 미생물학회지
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    • 제27권4호
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    • pp.317-322
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    • 1989
  • A gene can be selectively overexpressed in E. coli by utilizing the phage T7 RNA polymerase's stringent recognition and active transcription of the T7 promoter. The T7 expression system was constructed such that the T7 RNA polymerase gene is under the control of lacUV5 promoter in one plasmid, and that the target gene, the promoterless chloramphenicol acetyltransferase (CAT) gene with E. coli ribosome binding site is under the control of T7 promoter in the other plasmid. Only the E. coli cells containing both plasmids show high resistance to chloramphenicol. When the copy number of the runaway plasmid containing the polymerase gene was varied by a temperature shift, amounts of the CAT protein synthesized upon induction was correspondingly changed as shown in SDS gel electrophoresis.

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가자(Terminalia chebula Retz.) 열매 메탄올 추출물의 Histone Acetyltransferase 활성 저해에 따른 항전립선암 효과 (The Inhibitory Effect on Androgen Receptor-Dependent Prostate Cancer Cell Growth by Anti-Histone Acetyltransferase Activity from Terminalia chebula Retz. Fruit Methanol Extract)

  • 이유현
    • 한국식품영양과학회지
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    • 제42권10호
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    • pp.1539-1543
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    • 2013
  • 본 연구에서는 Terminalia chebula Retz.의 성숙열매인 가자 메탄올 추출물(TCME)을 이용하여 HAT 활성을 억제함으로써 AR의 아세틸화 감소를 유도하여 전립선암세포의 성장을 억제하였다. TCME의 처리는 HAT 활성을 100 ${\mu}g/mL$의 농도에서 50% 이상 저해하였으며, p300과 CBP 등의 특이적 HAT 단백질에서도 유의적인 저해활성을 보였다. TCME를 0~100 ${\mu}g/mL$로 안드로젠 수용체 의존적 전립선 암세포인 LNCaP에 처리한 결과, reporter assay에서 AR 매개 전사를 억제하고 AR target gene의 mRNA 발현을 억제하였다. 동일 농도에서 AR의 아세틸화가 감소한 결과를 보였으며, 결국 전립선암세포주의 성장억제를 유도하였다. 이같은 결과에서 가자 메탄올 추출물은 HAT 활성을 억제하며, AR의 아세틸화를 감소시킴으로써 효과적인 전립선암 치료소재로 개발될 수 있는 가능성이 있음을 제안한다.

Quantitative Analysis of Phosphinothricin-N-acetyltransferase in Genetically Modified Herbicide Tolerant Pepper by an Enzyme-Linked Immunosorbent Assay

  • Shim, Youn-Young;Shin, Weon-Sun;Moon, Gi-Seong;Kim, Kyung-Hwan
    • Journal of Microbiology and Biotechnology
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    • 제17권4호
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    • pp.681-684
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    • 2007
  • An immunoassay method was developed to quantitatively detect phosphinothricin-N-acetyltransferase (PAT) encoded by the Bialaphos resistance (bar) gene in genetically modified (GM) pepper. The histidine-tagged PAT was overexpressed in Escherichia coli M15 (pQE3l-bar) and efficiently purified by $Ni^{2+}$ affinity chromatography. A developed sandwich enzyme-linked immunosorbent assay (S-ELISA) method (detection limit: $0.01{\mu}g/ml$) was 100-fold more sensitive than a competitive indirect ELISA (CI-ELISA) method or Western blot analysis in detecting the recombinant PAT. In real sample tests, PAT in genetically modified herbicide-tolerant (GMHT) peppers was successfully quantified [$4.9{\pm}0.4{\mu}g/g$ of sample (n=6)] by the S-ELISA method. The S-ELISA method developed here could be applied to other GMHT crops and vegetables producing PAT.

Kanamycin Acetyltransferase Gene from Kanamycin-producing Streptomyces kanamyceticus IFO 13414

  • Joe, Young-Ae;Goo, Yang-Mo
    • Archives of Pharmacal Research
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    • 제21권4호
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    • pp.470-474
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    • 1998
  • A kanamycin producer, Streptomyces kanamyceticus IFO 13414 is highly resistant to kanamycin. Cloning of the kanamycin resistance genes in S. lividans 1326 with pIJ702 gave several kanamycin resistant transformants. Two transformants, S. lividans SNUS 90041 and S. lividan. SNUS 91051 showed similar resistance patterns to various aminoglycoside antibiotics. Gene mapping experiments revealed that plasmids pSJ5030 and pSJ2131 isolated from the transformants have common resistant gene fragments. Subcloning of pSJ5030 gave a 1.8 Kb gene fragment which showed resistance to kanamycin. Cell free extracts of S. lividans SNUS 90041, S. lividans SNUS 91051 and subclone a S. lividans SNUS 91064 showed kanamycin acetyltransferase activity. The detailed gene map is included.

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사람의 O-linked N-acetyl-$\beta$-D-glucosaminidase 유전자의 분석과 재조합 발현 (Analysis of Human O-GlcNAcase Gene and the Expression of the Recombinant Gene.)

  • 강대욱;서현효
    • 미생물학회지
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    • 제40권2호
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    • pp.87-93
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    • 2004
  • 세포질과 핵단백질의 serine과 threonine 잔기에 O-linked N-acetyl-$\beta$-glucosamine (O-GlcNAc)의 첨가는고등 진핵 세포에서 흔히 일어나는 번역 후 단백질의 변형 중 하나로서 단백질의 인산화와 유사한 세포 내 신호전달에 관여하는 것으로 보인다. O-GlcNAc의 첨가와 제거는 O-GlcNAc transferase (OGT)와 O-linked N-acetyl-$\beta$-D-glucos-aminidase (O-GlcNAcase) 효소에 의해 각각 촉매된다. 두가지 종류의 사람 유래 O-GlcNAcase 유전자(O-GlcNAcase, v-O-GlcNAcase)를cloning하고 세 가지의 융합단백질로 대장균에서 생산을 시도하였다. O-GlcNAcase의 기질 유사체 인 ${\rho}$-nitrophenyl-N-acetyl-$\beta$-D-g1ucosaminide (${\rho}$NP-$\beta$-D-GlcNAc)를 기질로 사용하여 효소활성을 측정 한 결과 v-O-GlcNAcase는 활성을 나타내지 않았다. 여러 종류의 amino sugar 기질 유사체를 사용하여 O-GlcNAcase의 활성을 측정하였으나 오직 ${\rho}$NP-$\beta$-D-GlcNAc만이 활성을 보였다. Blast검색으로 분석한 결과 아미노 말단의 hyaluronidase-like domain (hyaluronidase-유사 영역)과 카르복시 말단의 N-acetyltransferase 영역 두 곳의 conserved domains 존재하였다. 효소촉매에 중요한 영역을 밝히기 위해 여러 deletion mutants(결손 변이체)를 제작한 후 효소활성을 측정하고 Western blot으로 분석하였다. Hyaluronidas-유사 영역, 유전자 내부와 N-acetyltransferase 영역을 제거할 경우 효소활성이 사라졌으나 아미노 말단의 55개 아미노산과 카르복시 말단의 truncation은 활성을 일부분 유지하였다. 위의 사실에 기초하여 hyaluronidas-유사 영역은 효소활성에 중요하고 카르복시 말단의 N-acetyltransferase 영역은 조절기능으로 작용하는 것으로 추정된다.

DNA합성 억제제가 IMR-32 세포의 c-myc 발현 및 Choline Acetyltransferase 활성도에 미치는 영향 (Effects of DNA Synthesis Inhibitors on the Expression of c-myc and the Stimulation of Choline Acetyltransferase Activity in Human Neuroblastoma Cell Line, IMR-32)

  • 이정은;조경혜
    • 대한의생명과학회지
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    • 제3권1호
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    • pp.11-20
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    • 1997
  • 신경아세포종 세포 분화의 조절에 대한 연구는 아직 초기 단계에 불과하나 신경아세포종양의 임상적인 치료에 매우 중요한 기초가 된다. 본 연구는 신경아세포종 세포의 분화를 유도 할 수 있는 유용한 시약을 찾아내고자 하는 노력의 일환으로, 잘 알려진 DNA 합성 억제제가 신경 아세포종의 분화를 유도할 수 있는지를 살펴보고자 신경아세포종양 세포의 형태적, 생화학적 및 유전자 발현에 미치는 효과를 살펴보았다. 신경아세포종양으로부터 수립된 세포주, IMR-32 세포에 DNA 합성 억제제인 sodium butyrate, hydroxyurea, cytosine arabinoside를 각각 처리한 결과 처리하지 않은 대조군과는 달리 정상신경 세포 분화시 볼 수 있는 신경 돌기의 성장이 유도됨을 관찰할 수 있었으며 ,신경 전달 물질인 acetylcholine의 합성 효소인 choline acetyltransferase의 활성도가 현저히 증가되었다. 또한DNA합성 억제제를 처리하지 않은 IMR-32세포에서 탐지되지 않았던 c-myc 유전자의 발현이 시약 처리시 확연히 탐지됨을 관찰할 수 있었다. 이러한 실험 결과들은 DNA합성 억제제가 IMR-32세포의 성장을 억제하고 분화를 유도했음을 보여준 것이며, 어린 아이 시기에 많이 발병되는 신경아세포종양의 급속한 악성화나 전이의 억제기전을 제시해 줄 수 있으리라 생각한다.

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Metabolic Routes of Malonate in Pseudomonas fluorescens and Acinetobacter calcoaceticus

  • Byun, Hye-Sin;Kim, Yu-Sam
    • BMB Reports
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    • 제28권2호
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    • pp.107-111
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    • 1995
  • In malonate grown Pseudomonas fluorescens, malonate decarboxylase and acetyl-CoA synthetase were induced, whereas in Acinetobacter calcoaceticus malonate decarboxylase, acetate kinase, and phosphate acetyltransferase were induced. In both bacteria malonate decarboxylase was the first, key enzyme catalyzing the decarboxylation of malonate to acetate, and it was localized in the periplasmic space. Acetate thus formed was metabolized to acetyl-CoA directly by acetyl-CoA synthetase in Pseudomonas, and to acetyl-CoA via acetyl phosphate by acetate kinase and phosphate acetyltransferase in Acinetobacter.

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