Expression and purification of bioactive high-purity human midkine in Escherichia coli.
J Zhejiang Univ Sci B
; 10(2): 79-86, 2009 Feb.
Article
em En
| MEDLINE
| ID: mdl-19235265
ABSTRACT
Midkine is a heparin-binding growth factor, which plays important roles in the regulation of cell growth and differentiation. The non-tagged recombinant human midkine (rhMK) is therefore required to facilitate its functional studies of this important growth factor. In the present work, rhMK was expressed in Escherichia coli (E. coli) BL21 (DE3). The expression of midkine was efficiently induced by isopropyl-beta-D-thiogalactopyranoside (IPTG). After sonication, midkine was recovered in an insoluble form, and was dissolved in guanidine hydrochloride buffer. Renaturation of the denatured protein was carried out in the defined protein refolding buffer, and the refolded protein was purified using S-Sepharose ion-exchange chromatography. The final preparation of the rhMK was greater than 98% pure as measured by sodium dodecylsulfate-polyacrylamid gel electrophoresis (SDS-PAGE) and reverse phase high performance liquid chromatography (RP-HPLC). The purified rhMK enhanced the proliferation of NIH3T3 cells.
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Proteínas Recombinantes
/
Citocinas
Limite:
Animals
/
Humans
Idioma:
En
Revista:
J Zhejiang Univ Sci B
Assunto da revista:
BIOLOGIA
/
MEDICINA
Ano de publicação:
2009
Tipo de documento:
Article
País de afiliação:
China