Abstract
Transferrin is a glycoprotein functioning in iron transport in higher eukaryotes, and consists of two highly homologous domains. To study the function of the glycan residues attached exclusively to the C-terminal domain, we have constructed a plasmid allowing production of nonglycosylated human transferrin in Escherichia coli. By molecular biological and genetic techniques, production was stepped up to 60 mg/1. Similar plasmids were constructed for production of the two half-transferrins. The recombinant proteins accumulate in inclusion-body-like aggregates, where they appear to bind iron without causing bacteriostasis. Proteins active in iron binding have been purified from these inclusion bodies.
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