Expression and characterization of a functional single-chain variable fragment (scFv) protein recognizing MCF7 breast cancer cells in E. coli cytoplasm.

Abstract:

:Single-chain variable fragment (scFv) is one of the most common antibody forms. This report describes the expression of the scFv gene as a soluble protein in Origami DE3 cytoplasm. The purified scFv recognized the epidermal growth factor receptor (EGFRvIII) on the surface of MCF-7 cells. The scFv protein was purified in soluble form at a concentration of 10 mg/l, and the scFv protein activity and specificity were characterized using several immunological assays. The purified scFv protein showed specific binding to MCF-7 cells, evidenced by a band of 68 kDa in Western blot analysis, and immunofluorescence clearly proved that the scFv antibody recognized the EGFRvIII antigen epitopes. Furthermore, 53 % of the MCF-7 cells were bound to scFv protein, as measured by flow cytometry analysis. This study demonstrated that the Origami DE3 expression system can produce single-chain antibodies in active form for later use in gene therapy and vaccine production.

journal_name

Biochem Genet

journal_title

Biochemical genetics

authors

Mahgoub IO

doi

10.1007/s10528-012-9506-4

subject

Has Abstract

pub_date

2012-08-01 00:00:00

pages

625-41

issue

7-8

eissn

0006-2928

issn

1573-4927

journal_volume

50

pub_type

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