Directed immobilization of DNA-binding proteins on a cognate DNA-modified chip surface

J Biotechnol. 2008 May 20;135(1):16-21. doi: 10.1016/j.jbiotec.2008.02.019. Epub 2008 Mar 2.

Abstract

Here we describe a useful method for the site-directed immobilization of proteins with a DNA-binding domain (DNA-BD) on the cognate DNA-coated gold surface for surface plasmon resonance (SPR) imaging analyses. In order to assess the performance of this procedure, we utilized two DNA-BDs, yeast GAL4 DNA-BD, and bacterial LexA DNA-BD. After the immobilization of the cognate double-stranded DNAs (dsDNAs) to a gold chip surface with a monolayer of poly(l-lysine) for sequence-specific DNA-protein interaction, purified recombinant GAL4 DNA-BD:EGFP and LexA DNA-BD:RFP fusion proteins were applied to a dsDNA-spotted gold chip, and were subsequently analyzed using an SPR imaging system. Consequently, the recombinant DNA-binding proteins, GAL4 DNA-BD:EGFP and LexA DNA-BD:RFP, were shown to bind selectively to their cognate DNA sequences on the gold chip. Collectively, our results revealed that sequence-specific dsDNA microarray approach could prove useful in performing the site-directed immobilization of DNA-binding proteins onto a gold thin film in a parallel format, and thereby potentially allowing for the analysis of transcription factor binding profiling as well as for the monitoring of protein-protein interactions between target proteins with DNA-binding domain as a fusion tag and their binding partners.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Binding Sites
  • Coated Materials, Biocompatible / chemistry*
  • DNA / chemistry*
  • DNA-Binding Proteins / chemistry*
  • DNA-Binding Proteins / ultrastructure
  • Protein Array Analysis / methods*
  • Protein Binding
  • Protein Interaction Mapping / methods*

Substances

  • Coated Materials, Biocompatible
  • DNA-Binding Proteins
  • DNA