Portal de Periódicos da CAPES

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

2008; Elsevier BV; Volume: 135; Issue: 1 Linguagem: Inglês

10.1016/j.jbiotec.2008.02.019

1873-4863

Eun-Ju Jeong, Yoo Seok Jeong, Kyoungsook Park, So Yeon Yi, Junhyoung Ahn, Sang J. Chung, Moonil Kim, Bong Hyun Chung,

Gene expression and cancer classification

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.