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Comparative Protein Profiling of Intraphagosomal Expressed Proteins of Mycobacterium bovis BCG

[ Vol. 23 , Issue. 1 ]


Neelja Singhal, Manish Kumar, Divakar Sharma and Deepa Bisht   Pages 51 - 54 ( 4 )


BCG, the only available vaccine against tuberculosis affords a variable protection which wanes with time. In this study we have analyzed and compared the proteins which are expressed differentially during broth-culture and intraphagosomal growth of M.bovis BCG. Eight proteins which showed increased expression during the intraphagosomal growth were identified by MALDI-TOF/MS. These were - a precursor of alanine and proline-rich secreted protein apa, isoforms of malate dehydrogenase, large subunit alpha (Alpha-ETF) of electron transfer flavoprotein, immunogenic protein MPB64 precursor, UPF0036 protein, and two proteins with unknown function. Based on these findings we speculate that higher expression of these proteins has a probable role in intracellular survival, adaptation and/or immunoprotective effect of BCG. Further, these proteins might also be used as gene expression markers for endosome trafficking events of BCG.


Intraphagosomal, MALDI-TOF, M. bovis BCG, proteomics, two-dimensional gel electrophoresis, vaccine.


Department of Biochemistry, National JALMA Institute for Leprosy and Other Mycobacterial Diseases, Tajganj, Agra 282004, India

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