Flow cytometric immunoassay using E. coli with autodisplayed Z-domains

Min Park, Ji Hong Bong, Gu Yoo, Joachim Jose, Min Jung Kang, Jae Chul Pyun

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)


Recently, we reported a highly sensitive immunoassay using Escherichia coli cells with autodisplayed Z-domains. In this work, E. coli cells with autodisplayed Z-domains were applied to the flow-cytometry-based simultaneous detection of multiple analytes. The E. coli cells were doubly transfected to express a fluorescent protein (tdTomato) in the cytosol and the autodisplayed Z-domains on the outer membrane. By using E. coli cells with only the autodisplayed Z-domains, immunoassay of multiple analytes could be performed simultaneously on the same sample. Flow cytometry can be used to identify the immunoassay type by simultaneously detecting the fluorescence signal from the cytosol (tdTomato) and the fluorescence from the outer membrane, enabling the quantification of bound analytes after treatment with additional fluorescently labeled antibodies. To demonstrate the immunoassay of multiple analytes by using flow cytometry, human hepatitis B virus surface antigen (HBsAg) and C-reactive protein (CRP), a broad spectrum inflammation marker, were used as model analytes.

Original languageEnglish
Pages (from-to)181-188
Number of pages8
JournalEnzyme and Microbial Technology
Issue number3
Publication statusPublished - 2013 Aug 15

Bibliographical note

Funding Information:
This research was supported by DAPA and ADD . This research was also supported by the Seoul R&BD program ( JP 110066 ), the Korea Small and Medium Business Administration ( 2012-8-1231 ), and the National Research Foundation of Korea ( 2009-0082188 , 2009-008-1529 , 2010-0020772 , 2011-0020285 and 2012-8-1589 ).

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Bioengineering
  • Biochemistry
  • Applied Microbiology and Biotechnology


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