KR20140026781A - 인간 PDIb´a´태그를 이용한 생물학적 활성을 가진 인간 LIF 재조합 단백질의 대장균 내 발현 및 정제방법 - Google Patents
인간 PDIb´a´태그를 이용한 생물학적 활성을 가진 인간 LIF 재조합 단백질의 대장균 내 발현 및 정제방법 Download PDFInfo
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- KR20140026781A KR20140026781A KR1020120092392A KR20120092392A KR20140026781A KR 20140026781 A KR20140026781 A KR 20140026781A KR 1020120092392 A KR1020120092392 A KR 1020120092392A KR 20120092392 A KR20120092392 A KR 20120092392A KR 20140026781 A KR20140026781 A KR 20140026781A
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- Medicinal Chemistry (AREA)
- Proteomics, Peptides & Aminoacids (AREA)
- Peptides Or Proteins (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
- Preparation Of Compounds By Using Micro-Organisms (AREA)
Abstract
Description
도 2는 SDS-PAGE를 이용하여 대장균 내에서 3개의 태그들로 융합된 rhLIF의 발현을 분석한 결과이다. 단백질 발현은 0.5 mM IPTG 에 의해 (A) 37℃ 및 (B) 18℃에서 유도되었다. His8, 옥타히스티딘(octahistidine); hPDI, 인간 PDI의 전체길이(full-length), hPDIb´a´, 인간 PDI의 b´a´ 도메인; M, 분자량 사이즈 마커; C, 대조구로서 IPTG 유도 전의 총 세포 단백질; I, IPTG 유도 후의 총 세포 단백질; P, 불용성 세포 펠렛; S, 세포 초음파 처리 후 수용성 상등액.
도 3은 대장균 내에서 rhLIF의 분리에 대한 것이다. 대장균으로부터 발현된 (A) His8-LIF 및 (C) hPDIb´a´-hLIF는 SDS-PAGE에 의해 분석되었다. lane 5 및 lane 5'는 His8 및 hPDIb´a´가 거의 완전하게 절단되었다는 것을 나타낸다. M, 분자량 마커; lane 1 및 lane 1', 음성대조구로서 IPTG 유도 전 총 세포; lane 2 및 lane 2', IPTG로 처리한 총 세포; lane 3 및 lane 3', 세포 초음파 처리 후 수용성 분획; lane 4, His-trap HP 컬럼을 이용하여 분리한 His8-hLIF 융합 단백질(25 kDa); lane 4', 이온 교환 크로마토그래피를 이용하여 분리한 hPDIb´a´-hLIF 융합 단백질(55.4 kDa); lane 5, TEV 단백질 분해효소로 절단된 His8 태그: His8 (5 kDa) 및 rhLIF(20 kDa); lane 5', TEV 단백질 분해효소로 절단된 hPDIb´a´ 태그: hPDIb´a´ (35.6 kDa) 및 rhLIF(20 kDa); lane 6 및 lane 6', 최종 분리된 rhLIF. (B) 및 (D) 분리된 rhLIF의 최종 순도를 확인하기 위한 실버 염색된 10% SDS 젤 전기영동을 나타낸다. lane 7, His8 태그를 이용하여 정제된 rhLIF; lane 7', hPDIb´a´ 태그를 이용하여 정제된 rhLIF. (E) 절단 반응 후의 hLIF의 젤 여과 크로마토그램을 나타낸다. TEV 및 hPDIb´a´와 함께 절단된 hLIF는 다른 크기로 뚜렷하게 분리된다.
도 4는 대장균으로부터 분리된 rhLIF의 MALDI-TOF MS 분석결과를 나타낸다. (A) hLIF(181 aa)의 트립신 분해 펩타이드 지도. (B, C) 환원 및 비환원 조건에서 각각 분리된 hLIF의 MALDI-TOF MS 결과.
도 5는 생체 내(in vivo)의 생물학적 활성을 나타낸다. (A) 배아줄기세포에 대조구 LIF와 비교해서 재조합 LIF를 처리한 결과는 콜로니로 잘 자란 것을 확인하였다(왼쪽). 배아줄기세포는 LIF 존재하에 그 표면에서 SSEA-1 발현을 유지한다. 염색되지 않은 배아줄기세포는 background 발현을 하는데 사용되었다. (B) 배아줄기세포 유지와 분화과정을 보여주는 모식도(위쪽그림). 재조합 LIF 존재하에 유지되는 배아줄기세포는 대조구 LIF 존재 하에서와 같이 성공적으로 중배엽 전구체 Flk-1+를 대등하게 증가시켰다.
태그 크기 (kDa) | 융합 단백질 크기(kDa) | 발현 수준 (%) | 용해도(%) | ||||
37 o C | 18 o C | 37 o C | 18 o C | ||||
hLIF
(19.8 kDa ) |
His8 - 1 | 5.2 | 25.0 | 30.9 | 51.9 | 22.0 | 80.1 |
hPDI - | 59.8 | 79.6 | 12.0 | 78.3 | 97.0 | 95.4 | |
hPDIb'a' - | 35.6 | 55.4 | 66.2 | 80.2 | 41.8 | 99.5 |
Claims (9)
- 인간 단백질 이황화물 이성질화효소(human protein disulfide isomerase; hPDI)를 코딩하는 유전자 또는 hPDIb´a´ 도메인 유전자 중 어느 하나의 유전자; 및 인간 백혈병 억제 인자(human Leukemia inhibitory factor; hLIF) 유전자를 포함하는 재조합 발현벡터.
- 제 1 항에 있어서, 상기 hLIF 유전자는 서열번호 1로 표시되는 것을 특징으로 하는 재조합 발현벡터.
- 제 1 항에 있어서, 상기 hPDI 유전자는 서열번호 2이고, 상기 hPDIb´a´ 도메인 유전자는 서열번호 3으로 표시되는 것을 특징으로 하는 재조합 발현벡터.
- 제 1 항에 있어서, 상기 재조합 발현벡터는 도 1A(ii)의 개열지도를 갖는 것을 특징으로 하는 재조합 발현벡터.
- 제 1 항에 따른 재조합 발현벡터로 형질전환된 재조합 미생물.
- 제 5 항에 있어서, 상기 미생물은 대장균인 것을 특징으로 하는 재조합 미생물.
- 제 6 항에 있어서, 상기 대장균은 BL21(DE3)인 것을 특징으로 하는 재조합 미생물.
- 제 5 항에 따른 재조합 미생물을 배지에서 배양하여 hPDI 태그- 또는 hPDIb´a´ 도메인 태그-hLIF 재조합 단백질을 발현시키는 단계;
담배 식각 바이러스(Tobacco Etch Virus; TEV) 단백질 분해효소(protease)를 처리하여 상기 hPDI 태그 또는 hPDIb´a´ 도메인 태그를 제거하는 단계; 및
상기 hPDI 태그 또는 hPDIb´a´ 도메인 태그가 제거된 hLIF 재조합 단백질을 회수하는 단계를 포함하는 hLIF 재조합 단백질(rhLIF) 생산방법. - 제 8 항에 따른 생산방법에 의해 생산된 hLIF 재조합 단백질(rhLIF).
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