PMID: 9634791May 1, 1995Paper

A system for production of commercial quantities of human lactoferrin: a broad spectrum natural antibiotic

Bio/technology
P P WardO M Conneely

Abstract

We previously reported the production of limited quantities of biologically active recombinant human lactoferrin in the filamentous fungus Aspergillus oryzae. In the present study, we report a modification of this production system combined with a classical strain improvement program that has enabled production of levels of recombinant human lactoferrin in excess of 2 g/l. The protein was expressed in Aspergillus awamori as a glucoamylase fusion polypeptide which was secreted into the growth medium and processed to mature human lactoferrin by an endogenous KEX-2 peptidase. The recombinant protein retains full biological activity in terms of its ability to bind iron and human enterocyte receptors. Furthermore, the recombinant protein functions as a potent broad spectrum antimicrobial protein.

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