Cloning, expression and characterization of attachment-invasion locus protein (Ail) of Yersinia enterocolitica and its utilization in rapid detection by immunoassays.

Abstract:

AIMS:Rapid detection of pathogenic Yersinia enterocolitica isolates by using antisera raised against recombinant attachment-invasion locus (Ail) protein. METHODS AND RESULTS:The complete gene (471 bp) encoding for the Ail protein was amplified by PCR and cloned in pQE 30 UA vector. The recombinant clones were selected by polymerase chain reaction (PCR). Recombinant protein was expressed using induction with 1 mmol l(-1) final concentration of isopropylthiogalactoside (IPTG). Polyclonal antibodies were raised in mice against this purified recombinant protein. An indirect plate ELISA was standardized based on rAil protein for the detection of Y. enterocolitica. Western blot analysis with the sera raised against recombinant Ail protein exhibited reaction at 17 kDa region of the native Ail protein present in pathogenic Y. enterocolitica standard strains and strains isolated from pork samples suggesting that the antigenicity of recombinant Ail protein was similar to that of native Ail protein. Nonpathogenic Y. enterocolitica and the other species of Yersinia, namely, Y. pseudotuberculosis, Y. intermedia, Y. kristenseni, Y. fredrickseni and also the Enterobacteriaceae organisms tested were not found reacting to polyclonal antisera against this recombinant Ail protein. CONCLUSION:The antibodies raised against recombinant Ail protein could specifically identify pathogenic Y. enterocolitica strains both by indirect plate ELISA and Western blot immunoassay. SIGNIFICANCE AND IMPACT OF THE STUDY:The method developed in this study may find application in the detection of pathogenic Y. enterocolitica not only from food and environmental samples but also from clinical samples.

journal_name

Lett Appl Microbiol

authors

Balakrishna K,Murali HS,Batra HV

doi

10.1111/j.1472-765X.2009.02755.x

subject

Has Abstract

pub_date

2010-02-01 00:00:00

pages

131-7

issue

2

eissn

0266-8254

issn

1472-765X

pii

LAM2755

journal_volume

50

pub_type

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