In vitro selection of bispecific diabody fragments using covalent bicistronic DNA display

Masanao Nakayama, Shoko Komiya, Kei Fujiwara, Kenichi Horisawa, Nobuhide Doi

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Bispecific antibodies with two different antigen-binding sites have been widely used for a variety of medical applications. The activity and stability of antibody fragments can be improved by in vitro evolution. Although the affinity and stability of small bispecific antibody fragments such as diabodies can be further optimized by in vitro display technologies, cell-free display of bispecific antibody fragments has not been reported. In this study, we applied a covalent bicistronic DNA display for the in vitro selection of heterodimeric diabodies. First, we confirmed the antigen-binding activities of a diabody synthesized by an in vitro transcription and translation system. However, when we performed DNA-display selection of a model diabody library in a proof-of-principle experiment, no enrichment of the diabody gene was observed, likely due to a low yield of the diabody heterodimer. To overcome this issue, we introduced cysteine residues at the VH-VL interface of the diabody heterodimer. Using the disulfide-stabilized diabodies, we successfully enriched the diabody gene from a model library. Our results indicate that the covalent bicistronic DNA display technique could be useful for improving the stability and affinity of bispecific diabody fragments.

Original languageEnglish
Pages (from-to)606-611
Number of pages6
JournalBiochemical and Biophysical Research Communications
Volume478
Issue number2
DOIs
Publication statusPublished - 2016 Sep 16

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Keywords

  • Bispecific antibody
  • Cell-free protein synthesis
  • Display technology
  • Disulfide stabilization
  • PURE system

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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