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대장균에서 재조합 인간 Interleukin 4 의 생산 , 정제 및 면역조절활성의 측정
양영,윤석란,이충은,변광호 ( Young Yang,Suk Ran Yoon,Choong Eun Lee,Kwang Ho Pyun ) 생화학분자생물학회 1992 BMB Reports Vol.25 No.1
The recombinant human interleukin 4 (rhIL-4) has been over expressed in E. coli transformed with expression vector pET-3b containing bacteriophage T7 promoter, into which the hIL-4 cDNA was subclond. The insolubility of the recombinant protein offered an advantage of purification in only a few steps. The recombinant human IL-4 was refolded using reduced/oxidized glutathione to restore the proper conformation and purified to homogeneity by one passage over ion exchange column. The purified protein was shown as a single band on SDS-PAGE. The refolded rhIL-4 was characterized by nucleotide sequence analysis and bioassays. The purified rhIL-4 has biological activities on B cell proliferation and induction of B cell differentiation antigen, CD23, which strongly indicates that the protein is folded correctly.
대장균에서 재조합 인간 Interleukin 6의 대량생산 및 그 생물학적 활성의 측정
양영,강형식,나우진,이충은,변광호 ( Young Yang,Hyung Sik Kang,Woo Jin Na,Choong Eun Lee,Kwang Ho Pyun ) 생화학분자생물학회 1992 BMB Reports Vol.25 No.2
Human interleukin 6 (hIL-6) is a multifunctional cytokine involved in acute phase and immune response. While a critical role of IL-6 in various immune disorders has been suggested, studies on its detailed functional mechanism are often hampered due to the low natural abundance of this cytokine. Thus, for a large scale production of hIL-6, we have made an attempt to directly express hIL-6 using pET-8c expression plasmid under the control of T7 promoter in Escherichia coli. A cDNA coding for hIL-6 without the signal sequence was amplified using PCR reaction, fused to pET-8c, and transformed into E. coli (λDE3). Upon induction with isopropyl thiogalactoside, recombinant human interleukin 6 (rhIL-6) was overexpressed as a form of inculsion bodies, with its expression level reaching over 30% of total E. coli proteins. The rhIL-6 was isolated from inclusion bodies by solubilization in 6 M guanidine hydrochloride followed by dialysis against 50 mM Tris buffer. A single passage over DEAE-Sepharose faciliated the purification of rhIL-6. The purified rhIL-6 was characterized by nucleotide sequence analysis and bioassays. The biological activity was confirmed by proliferation of B9 cells and immunoglobulin secretion of SAC-blast B cells.