Production and characterization of recombinant chicken insulin-like growth factor-II from Escherichia coli.
Recombinant chicken (c)IGF-II has been produced in Escherichia coli after first modifying a plasmid that coded for a human (h)IGF-II fusion protein. The cIGF-II fusion protein, deposited in bacterial inclusion bodies, was dissolved under reducing conditions, desalted, subjected to anion-exchange chromatography and refolded. Recombinant cIGF-II was then released from the fusion protein using a genetically engineered serine protease and purified to homogeneity by reverse-phase HPLC. In vitro analysis of recombinant cIGF-II revealed differences between cIGF-II and its human counterpart. Recombinant cIGF-II was less potent than hIGF-II in stimulating protein synthesis in rat myoblasts. This appeared to be due to a decreased affinity for the type-1 IGF receptor. The human and chicken peptides were similar, however, in studies assessing binding to the type-2 IGF receptor and to IGF-binding proteins. Moreover, recombinant cIGF-II and hIGF-II were equipotent in both biological and receptor binding studies in chick embryo fibroblasts, suggesting that there may be a difference between mammalian and avian type-1 IGF receptors.
Upton
Z
Z
Cooperative Research Centre for Tissue Growth and Repair, Adelaide, Australia.
Francis
G L
GL
Kita
K
K
Wallace
J C
JC
Ballard
F J
FJ
D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D002645:Chickens; D003429:Cross Reactions; D004247:DNA / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics; D006801:Humans; D007120:Immunochemistry; D007335:Insulin-Like Growth Factor II / Q000096:biosynthesis* / Q000235:genetics / Q000302:isolation & purification; D008969:Molecular Sequence Data; D017526:Receptor, IGF Type 1 / Q000378:metabolism; D011993:Recombinant Fusion Proteins / Q000096:biosynthesis / Q000235:genetics / Q000302:isolation & purification
D011993:Recombinant Fusion Proteins; D007335:Insulin-Like Growth Factor II; D004247:DNA; D017526:Receptor, IGF Type 1