A new expression vector facilitating production and functional analysis of scFv antibody fragments selected from Tomlinson I+J phagemid libraries

Karolina Ossysek, Tomasz Uchański, Małgorzata Kulesza, Monika Bzowska, Tomasz Klaus, Klaudia Woś, Mariusz Madej, Joanna Bereta*

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

14 Citations (Scopus)

Abstract

Tomlinson I+J are synthetic phagemid human scFv libraries widely employed to obtain specific antibody fragments via a phage display method. The pIT2/HB2151 expression system proposed by the designers of the libraries has certain drawbacks which result in the lack of expression or low expression levels of numerous soluble scFvs. At the stage of scFv screening, this may lead to losing some excellent antibodies, which can be avoided but requires laborious and expensive work. Here we present a new, pET-30-based vector, which is compatible with Tomlinson libraries, retains all virtues of pIT2 used as a plasmid and eliminates all its flaws. We demonstrate that pET-scFv-T is frequently superior to pIT2 in terms of efficient scFv expression. Moreover, an amber suppressor bacterial strain, RosettaBlue(DE3)pLysS, transformed with the new vector, pET-scFv-T, coding for a number of scFvs, produces substantial amounts of functional, easy to purify recombinant antibody fragments, regardless of whether their coding sequences contain amber codons. Thus, pET-scFv-T/RosettaBlue(DE3)pLysS expression system seems to be a perfect tool for screening for the finest soluble scFvs selected from Tomlinson I+J, as well as from many other phagemid libraries.

Original languageEnglish
Pages (from-to)95-102
Number of pages8
JournalImmunology Letters
Volume167
Issue number2
DOIs
Publication statusPublished - 1 Oct 2015
Externally publishedYes

Keywords

  • Amber codon
  • Expression vector
  • ScFv
  • Tomlinson I+J

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