High-level expression and simple purification of recombinant human insulin-like growth factor I

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Title
High-level expression and simple purification of recombinant human insulin-like growth factor I
Author(s)
Sun Ok Kim; Young Ik Lee
Bibliographic Citation
Journal of Biotechnology, vol. 48, no. 1, pp. 97-105
Publication Year
1996
Abstract
Human insulin-like growth factor I (IGF-I) was expressed in Escherichia coli as a truncated beta-galactosidase-IGF-I fusion protein. The Lac Z' gene was truncated by removal of a 490 bp fragment which encoded 163 N-terminal residues of beta-galactosidase and was connected to the IGF-I cDNA by a linker encoding hydroxylamine cleavage recognition sequence. By truncating Lac Z' gene, the overall yield and purification procedures of IGF-I from fusion protein have been improved. The fusion protein was produced in the form of insoluble inclusion bodies with isopropyl-1-thio-beta-D-galactoside (IPTG) induction. After cleavage of the fusion protein with hydroxylamine, the released IGF-I was purified to homogeneity by a cation exchange chromatography, refolding and reverse-phase high performance liquid chromatography (rp-HPLC). The purified IGF-I was found to be indistinguishable from the native IGF-I by N-terminal amino acid sequence, SDS-polyacrylamide gel electrophoresis, and rp-HPLC and by biological activities such as thymidine uptake, protein synthesis and receptor binding. These results suggest that the expression and simple purification of recombinant human IGF-I described in this paper may be useful for large scale production of IGF-I.
Keyword
fusion proteininsulin-like growth factor I
ISSN
0168-1656
Publisher
Elsevier
DOI
http://dx.doi.org/10.1016/0168-1656(96)01402-2
Type
Article
Appears in Collections:
1. Journal Articles > Journal Articles
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