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Biotechnology Letters

, Volume 30, Issue 3, pp 421–425 | Cite as

Label-free homogeneous detection of immunoglobulin E by an aptameric enzyme subunit

  • Wataru Yoshida
  • Koji Sode
  • Kazunori Ikebukuro
Original Research Paper

Abstract

We have developed an aptameric enzyme subunit (AES) for immunoglobulin E (IgE) sensing. AES is an artificial enzyme subunit constructed from two different aptamers and does not require any modification. Using the AES, the target molecule can be detected by measuring enzymatic activity in homogeneous solution. We connected IgE-binding aptamer and its complementary strand to split thrombin-inhibiting aptamer. The hybrid of these two oligonucleotides inhibited thrombin activity and it decreased in the presence of IgE. We were able to detect IgE by using this AES in homogeneous solution with a detection limit of 50 pmol.

Keywords

Aptameric enzyme subunit Enzyme-inhibiting aptamer Protein detection Immunoglobulin E 

Notes

Acknowledgment

This work was supported by Industrial Technology Research Grant Program in 2006 from New Energy and Industrial Technology Development Organization (NEDO) of Japan.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.Department of Biotechnology and Life ScienceTokyo University of Agriculture and TechnologyKoganei, TokyoJapan

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