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The development of molecules specific for  M. tuberculosis -infected cells has important implications, as these tools may facilitate understanding of the mechanisms regulating host pathogen interactions  in vivo . In addition, development of new tools capable to targeting  M. tuberculosis -infected cells may have potential applications to diagnosis, treatment, and prevention of tuberculosis (TB). Due to the lack of CD1b polymorphism,  M. tuberculosis  lipid-CD1b complexes could be considered as universal tuberculosis infection markers. The aim of the present study was to display on the PIII surface protein of m13 phage, a human αβ single-chain T-cell receptor molecule specific for CD1b:2-stearoyl-3-hydroxyphthioceranoyl-2´-sulfate-α-α´-D-trehalose (Ac 2 SGL) which is a complex presented by human cells infected with  M. tuberculosis . The results showed the pIII fusion particle was successfully displayed on the phage surface. The study of the recognition of the recombinant phage in ELISA and immunohistochemistry showed the recognition of CD1b:Ac 2 SGL complexes and cells in human lung tissue from a tuberculosis patient respectively, suggesting the specific recognition of the lipid-CD1b complex.

bmc immunology

Phage display of functional αβ single-chain T-cell receptor molecules specific for CD1b:Ac2SGL complexes from Mycobacterium tuberculosis-infected cells