Antigens secreted from Mycobacterium tuberculosis: identification by proteomics approach and test for diagnostic marker

Proteomics
Young Yil BahkYu Sam Kim

Abstract

Tuberculosis caused by mycobacteria, mainly Mycobacterium tuberculosis, is a major infectious disease of the respiratory system. An early diagnosis followed by chemotherapy is the major control strategy. In an effort to identify the antigens suitable for immunodiagnosis and vaccines, the proteins secreted in a culture medium from the M. tuberculosis K-strain, which is the most prevalent among the clinical isolates in Korea and belongs to the Beijing family, were analyzed by two-dimensional polyacrylamide gel electrophoresis (2-D PAGE) and compared with those from the M. tuberculosis H37Rv and CDC1551 strains. Eight proteins, Rv0652, Rv1636, Rv2818c, Rv3369, Rv3865, Rv0566c, MT3304, and Rv3160, were identified by matrix-assisted laser desorption/ionization-time of flight-mass spectrometry (MALDI-TOF-MS) or liquid chromatography-electrospray ionization-mass spectrometry (LC-ESI-MS) and found to be relatively abundant in the culture medium from the M. tuberculosis K-strain but less so from the CDC1551 or H37Rv strains. In addition, Rv3874 (CFP-10), Rv-0560c and Rv3648c, which were expressed increasingly in the K and CDC1551 strains, were also identified using the same proteomics technology. All proteins were prepared by molecular ...Continue Reading

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