Evaluation of MafG interaction with Maf recognition element arrays by surface plasmon resonance imaging technique

Motoki Kyo, Tae Yamamoto, Hozumi Motohashi, Terue Kamiya, Toshihiro Kuroita, Toshiyuki Tanaka, James Douglas Engel, Bunsei Kawakami, Masayuki Yamamoto

Research output: Contribution to journalArticlepeer-review

69 Citations (Scopus)


Specific interactions between transcription factors and cis-acting DNA sequence motifs are primary events for the transcriptional regulation. Many regulatory elements appear to diverge from the most optimal recognition sequences. To evaluate affinities of a transcription factor to various suboptimal sequences, we have developed a new detection method based on the surface plasmon resonance (SPR) imaging technique. Transcription factor MafG and its recognition sequence MARE (Maf recognition elements) were adopted to evaluate the new method.We modified DNA immobilization procedure on to the gold chip, so that a double-stranded DNA array was successfully fabricated.We further found that a hydrophilic flexible spacer composed of the poly (ethylene glycol) moiety between DNA and alkanethiol self-assembled monolayers on the surface is effective for preventing nonspecific adsorption and facilitating specific binding of MafG. Multiple interaction profiles between MafG and six of MARE-related sequences were observed by the SPR imaging technique.The kinetic values obtained by SPR imaging showed very good correlation with those obtained from electrophoretic gel mobility shift assays, although absolute values were deviated from each other. These results demonstrate that the double-stranded DNA array fabricated with the modified multistep procedure can be applied for the comprehensive analysis of the transcription factor-DNA interaction.

Original languageEnglish
Pages (from-to)153-164
Number of pages12
JournalGenes to Cells
Issue number2
Publication statusPublished - 2004 Feb
Externally publishedYes

ASJC Scopus subject areas

  • Genetics
  • Cell Biology


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