A general and rapid cell-free approach for the interrogation of protein-protein, protein-DNA, and protein-RNA interactions and their antagonists utilizing split-protein reporters

Jason R. Porter, Cliff I. Stains, Benjamin W. Jester, Indraneel Ghosh

Research output: Contribution to journalArticle

49 Scopus citations


Split-protein reporters have emerged as a powerful methodology for imaging biomolecular interactions which are of much interest as targets for chemical intervention. Herein we describe a systematic evaluation of split-proteins, specifically the green fluorescent protein, β-lactamase, and several luciferases, for their ability to function as reporters in completely cell-free systems to allow for the extremely rapid and sensitive determination of a wide range of biomolecular interactions without the requirement for laborious transfection, cell culture, or protein purification (12-48 h). We demonstrate that the cell-free split-luciferase system in particular is amenable for directly interrogating protein-protein, protein-DNA, and protein-RNA interactions in homogeneous assays with very high sensitivity (22-1800 fold) starting from the corresponding mRNA or DNA. Importantly, we show that the cell-free system allows for the rapid (2 h) identification of target-site specificity for protein-nucleic acid interactions and in evaluating antagonists of protein-protein and protein-peptide complexes circumventing protein purification bottlenecks. Moreover, we show that the cell-free split-protein system is adaptable for analysis of both protein-protein and protein-nucleic acid interactions in artificial cell systems comprising water-in-oil emulsions. Thus, this study provides a general and enabling methodology for the rapid interrogation of a wide variety of biomolecular interactions and their antagonists without the limitations imposed by current in vitro and in vivo approaches.

Original languageEnglish (US)
Pages (from-to)6488-6497
Number of pages10
JournalJournal of the American Chemical Society
Issue number20
Publication statusPublished - May 21 2008


ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

Cite this