Efficient expression and purification of recombinant therapeutic protein candidates, human midkine and pleiotrophin.

Abstract:

:Midkine is a heparin-binding growth factor that promotes cell growth, survival, and migration. Externally added midkine prevents ventricular remodeling and improves long-term survival after myocardial infarction in the mouse. Preclinical testing of this protein is in progress. Externally added pleiotrophin, a member of the midkine protein family, promotes functional recovery after neural transplantation in rats. Thus, pleiotrophin is also a candidate therapeutic protein. Large amounts of these proteins were obtained by using the heterologous protein expression system of Pichia pastoris, and the recombinant P. pastoris clones were cultured in a controlled fermentor. Intracellular expression yielded about 300 mg/L recombinant human (rh)-midkine, which was extracted, renatured, and purified. From 1 L of the culture, 64 mg of rh-midkine was purified. Secretory expression induced by the midkine secretion signal resulted in about 100 mg of rhmidkine in 1 L of the culture supernatant, but over 70% of the rh-midkine had yeast-specific glycosylation. Three threonyl residues that are targets for glycosylation were substituted with alanyl residues, and nonglycosylated, active rh-midkine was obtained. In secretory expression using α-mating factor prepro-sequence, about 640 mg/L rh-midkine was obtained, but it was partially truncated. Therefore, a protease-deficient host was used, and about 360 mg/L intact rh-midkine was then obtained. The rh-midkine was recovered and purified, with 70% final yield. All purified rh-midkine, regardless of expression method, was able to promote mammalian cell proliferation. In secretory expression of rh-pleiotrophin using α- mating factor prepro-sequence, 260 mg/L rh-pleiotrophin could be secreted. The rh-pleiotrophin was recovered and efficiently purified with 72% final yield.

journal_name

Curr Pharm Biotechnol

authors

Murasugi A

doi

10.2174/1389201014666131226114919

subject

Has Abstract

pub_date

2013-01-01 00:00:00

pages

768-84

issue

8

eissn

1389-2010

issn

1873-4316

pii

CPB-EPUB-58284

journal_volume

14

pub_type

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