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Kim, Lee, Lee, Jung, Yuk, Ha, and Jung: Development of Protein Chip for Diagnosis of Chlamydophia Pneumoniae
Original Article
Tuberculosis and Respiratory Diseases

Tuberculosis and Respiratory Diseases 2006; 60(4): 412-418.

Published online: 30 April 2006

DOI: https://doi.org/10.4046/trd.2006.60.4.412

Development of Protein Chip for Diagnosis of Chlamydophia Pneumoniae

Woo Jin Kim, M.D.1, Hui Young Lee, M.D.1, Seung-Joon Lee, M.D.1, Se-Hui Jung2, Jong Seol Yuk, PhD.2, Kwon-Soo Ha, PhD.2, Ki-Suck Jung, M.D.3

1Department of Internal Medicine, College of Medicine, Kangwon National University, Korea.

2Department of Molecular and Cellular Biochemistry, College of Medicine, Kangwon National University, Korea.

3Department of Internal Medicine, College of Medicine, Hallym University, Korea.

Address for correspondence: Ki-Suck Jung, M.D. Division of pulmonary and critical care medicine, Department of Internal Medicine, Hallym University Sacred Heart Hospital, 896 Pyungchon-dong, Dongan-gu, Anyang 431-070, Korea. TEL: +82-31-380-3717, FAX: +82-31-380-3973, pulmoks@hallym.or.kr

Received 10 March 2006       Accepted 17 April 2006

Copyright © 2006 The Korean Academy of Tuberculosis and Respiratory Diseases

Abstract

Background

The diagnosis of chlamydial infection is based on serology. The current gold standard of diagnosis is MIF(microimmunofluorescence), but this modality is subjective and time-consuming. Protein microarray with using a SPR(surface plasmon resonance) sensor has recently been suggested as a method for detecting infection. For developing a protein chip to diagnose chlamydial infection, EBs(elementary bodies) were immobilized on a gold chip and the interaction between an antibody for Chlamydophila pneumoniae and the EBs(elementary bodies) immobilized on the surface of the gold chip was measured by using an SPR sensor.

Methods

For the surface antigen, the EBs of Chlamydophila pneumoniae LKK1 were purified. Charged arrays were prepared by using PDDA(polydiallyldimethylammonium chloride) which has a positive charge. After immobilization of the chlamydial EBs on the PDDA surface, the investigation of the surface was done with using atomic force microscopy. After the antibody for C. pneumoniae was applied on chip, we monitored the SPR wavelength-shift to detect any antigen-antibody interaction with using a self-assembled SPR sensor.

Results

The chlamydial EBs on the positively charged PDDA were visible on the surface with using atomic force microscopy. The SPR wavelength increased after interaction of antibody for C. pneumoniae with the EBs immobilized on charged gold surface. The wavelength-shift was correlated with the concentration of antigens.

Conclusion

The surface immobilization of EBs on the gold surface with the charged arrays was identified and the antigen-antibody interaction on the gold chip was detected via the SPR sensor. Further investigations are needed to apply this technique to the clinical field.

Keywords: Chlamydophila pneumoniae, Protein array analysis

Figures and Tables

Figure 1
Scheme of self-assembled SPR sensor.
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Figure 2
Atomic force microscopy image of C. pneumoniae(EB) on PDDA (polydiallyldimethylammonium chloride) gold surface
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Figure 3
Scanning electron microscopy image of C. pneumoniae(EB) on PDDA (polydiallyldimethylammonium chloride) gold surface
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Figure 4
SPR(surface plasmon resonance) wavelength change after antibody-antigen interaction
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