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Use of antibody gene library for the isolation of specific single chain antibodies by ampicillin-antigen conjugates.

Abstract：

:Isolation of recombinant antibodies from antibody libraries is commonly performed by different molecular display formats including phage display and ribosome display or different cell-surface display formats. We describe a new method which allows the selection of Escherichia coli cells producing the required single chain antibody by cultivation in presence of ampicillin conjugated to the antigen of interest. The method utilizes the neutralization of the conjugate by the produced single chain antibody which is secreted to the periplasm. Therefore, a new expression system based on the pET26b vector was designed and a library was constructed. The method was successfully established first for the selection of E. coli BL21 Star (DE3) cells expressing a model single chain antibody (anti-fluorescein) by a simple selection assay on LB-agar plates. Using this selection assay, we could identify a new single chain antibody binding biotin by growing E. coli BL21 Star (DE3) containing the library in presence of a biotin-ampicillin conjugate. In contrast to methods as molecular or cell surface display our selection system applies the soluble single chain antibody molecule and thereby avoids undesired effects, e.g. by the phage particle or the yeast fusion protein. By selecting directly in an expression strain, production and characterization of the selected single chain antibody is possible without any further cloning or transformation steps.

journal_name

Immunol Lett

journal_title

Immunology letters

authors

Neumann-Schaal M,Messerschmidt K,Grenz N,Heilmann K

doi

10.1016/j.imlet.2013.02.005

subject

Has Abstract

pub_date

2013-03-01 00:00:00

pages

39-43

issue

1-2

eissn

0165-2478

issn

1879-0542

pii

S0165-2478(13)00032-1

journal_volume

151

pub_type

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