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| PRODUCTION AND FUNCTIONAL-CHARACTERIZATION OF A RECOMBINANT FRAGMENT OF VONWILLEBRAND-FACTOR (VWF) - AN ANTAGONIST TO PLATELET RECEPTOR GP-IB |
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| Author(s): PRIOR C, CHU V, HOLT J, WINDISCH V, LEE T, MITSCHELEN J, NEWMAN J, RICCA G, TARR C, HRINDA M |
| Source: BIO-TECHNOLOGY Volume: 10 Issue: 1 Pages: 66-73 Published: JAN 1992 |
| Times Cited: 12 References: 16 |
| Abstract: We expressed a recombinant peptide fragment (Ser445-Val733) of human von Wille-brand factor (vWF), containing the binding domain for the platelet receptor of GP Ib, in E. coli. This 33 kD peptide blocks binding of the intact vWF molecule to GP Ib in the presence of modulators. Thus, it offers potential as an antithrombotic agent. High level expression was achieved in a plasmid construct driven by the bacterio-phage T7 promoter. The peptide was solubilized from inclusion bodies in strong chaotrope, then reduced and alkylated. Following purification, formulation at pH 3.5, and lyophilization, the reconstituted experimental product (RG 12986) exists as an equilibrium of monomer and dimer species. When formulated above pH 5.0, soluble aggregates are formed; these solutions have less bioactivity than RG 12986. Interestingly, the non-aggregated state of RG 12986 remains conserved following dilution and incubation with platelet-poor plasma. The overall purification/low pH formulation strategies may be applicable to other E. coli recombinant proteins having a tendency to aggregate following removal of chaotrope near physiologic pH when in a concentrated format. |
| Document Type: Article |
| Language: English |
| Reprint Address: PRIOR, C (reprint author), PHONE POULENC RORER, DIV BIOTECHNOL, 680 ALLENDALE RD, KING OF PRUSSIA, PA 19406 USA |
| Publisher: NATURE PUBLISHING CO, 345 PARK AVE SOUTH, NEW YORK, NY 10010-1707 |
| Subject Category: Biotechnology & Applied Microbiology |
| IDS Number: HK665 |
| ISSN: 0733-222X |
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