High-level expression of human insulin-like growth factor II in Escherichia coli.
A gene encoding mature human insulin-like growth factor II (IGF-II) was constructed from the modified IGF-II cDNA sequence and two double-stranded synthetic oligodeoxynucleotide linkers. It was fused to a truncated lacZ gene such that IGF-II was expressed as part of C-terminus of beta-galactosidase. This fused lacZ'-IGF-II gene was under the control of tac promoter and we overproduced the beta-galactosidase-IGF-II fusion protein in the Escherichia coli. The fusion protein formed inclusion bodies inside the cells. The fusion protein was purified from the isolated inclusion bodies and IGF-II protein was obtained from their fusion protein by CNBr cleavage. The released IGF-II was confirmed by its molecular weight as determined by SDS-PAGE and by its ability to bind anti-IGF antibody.
Department of Biological Science and Engineering, Korea Advanced Institute of Science and Technology, Seoul.
H J
HJ
Rhee
Y I
YI
Lee
K H
KH
Yang
D000595:Amino Acid Sequence; D001483:Base Sequence; D001709:Biotechnology; D003001:Cloning, Molecular; D004247:DNA / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics / Q000378:metabolism; D006801:Humans; D007335:Insulin-Like Growth Factor II / Q000096:biosynthesis* / Q000235:genetics / Q000302:isolation & purification; D008969:Molecular Sequence Data; D010957:Plasmids; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000235:genetics / Q000302:isolation & purification; D013002:Somatomedins / Q000096:biosynthesis*
D011993:Recombinant Fusion Proteins; D013002:Somatomedins; D007335:Insulin-Like Growth Factor II; D004247:DNA