Methods for reducing nonspecific interaction in antibody-antigen assay via atomic force microscopy

Jun'ichi Wakayama, Hiroshi Sekiguchi, Satoshi Akanuma, Toshio Ohtani, Shigeru Sugiyama*

*この研究の対応する著者

研究成果: Article査読

33 被引用数 (Scopus)

抄録

We developed a method to measure the rupture forces between antibody and antigen by atomic force microscopy (AFM). Previous studies have reported that in the measurement of antibody-antigen interaction using AFM, the specific intermolecular forces are often obscured by nonspecific adhesive binding forces between antibody immobilized cantilever and substrate surfaces on which antigen or nonantigen are fixed. Here, we examined whether detergent and nonreactive protein, which have been widely used to reduce nonspecific background signals in ordinary immunoassay and immunoblotting, could reduce the nonspecific forces in the AFM measurement. The results showed that, in the presence of both nonreactive protein and detergent, the rupture forces between anti-ferritin antibodies immobilized on a tip of cantilever and ferritin (antigen) on the substrate could be successfully measured, distinguishing from nonspecific adhesive forces. In addition, we found that approach/retraction velocity of the AFM cantilever was also important in the reduction of nonspecific adhesion. These insights will contribute to the detection of specific molecules at nanometer scale region and the investigation of intermolecular interaction by the use of AFM.

本文言語English
ページ(範囲)51-58
ページ数8
ジャーナルAnalytical Biochemistry
380
1
DOI
出版ステータスPublished - 2008 9月 1
外部発表はい

ASJC Scopus subject areas

  • 生物理学
  • 生化学
  • 分子生物学
  • 細胞生物学

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