Expression vectors encoding bispecific fusion proteins and methods of producing biologically active bispecific fusion proteins in a mammalian cell
US6623940B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2000 |
| Grant date | Sep 23, 2003 |
| Priority date | — |
| Expiry date | Apr 13, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N2333/705
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention provides an expression vector encoding monospecific or bispecific fusion protein. In one embodiment the expression vector encodes a monospecific fusion protein, which vector comprises a recombinant monospecific single chain cassette comprising a DNA sequence encoding a first binding domain capable of binding a cell surface antigen. In another embodiment the expression vector encodes a bispecific fusion protein, which vector comprises a recombinant bispecific single chain cassette comprising a DNA sequence encoding a first binding domain capable of binding a cell surface antigen and a DNA sequence encoding a second binding domain capable of binding a cell surface antigen, each domain capable of binding a different antigen. The present invention also provides a method for producing a biologically active monospecific or bispecific fusion protein in a mammalian cell. This method comprises: (a) transfecting the mammalian cell with the recombinant expression vector of the invention; (b) culturing the mammalian cell so transfected in step (a); and (c) recovering the biologically active bispecific fusion protein so as produced by the cultured mammalian cell.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.