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Production of functional antibody fragments in a vesicle-based eukaryotic cell-free translation system

 
: Stech, M.; Merk, H.; Schenk, J.A.; Stöcklein, W.; Wüstenhagen, D.; Micheel, B.; Duschl, C.; Bier, F.F.; Kubick, S.

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Journal of biotechnology 164 (2012), No.2, pp.220-231
ISSN: 0168-1656
ISSN: 1389-0352
ISSN: 1873-4863
English
Journal Article
Fraunhofer IBMT ()

Abstract
Cell-free protein synthesis is of increasing interest for the rapid and high-throughput synthesis of many proteins, in particular also antibody fragments. In this study, we present a novel strategy for the production of single chain antibody fragments (scFv) in a eukaryotic in vitro translation system. This strategy comprises the cell-free expression, isolation and label-free interaction analysis of a model antibody fragment synthesized in two differently prepared insect cell lysates. These lysates contain translocationally active microsomal structures derived from the endoplasmic reticulum (ER), allowing for posttranslational modifications of cell-free synthesized proteins. Both types of these insect cell lysates enable the synthesis and translocation of scFv into ER-derived vesicles. However, only the one that has a specifically adapted redox potential yields functional active antibody fragments. We have developed a new methodology for the isolation of functional target proteins based on the translocation of cell-free produced scFv into microsomal structures and subsequent collection of protein-enriched vesicles. Antibody fragments that have been released from these vesicles are shown to be well suited for label-free binding studies. Altogether, these results show the potential of insect cell lysates for the production, purification and selection of antibody fragments in an easy-to-handle and time-saving manner.

: http://publica.fraunhofer.de/documents/N-244684.html