Peptides of a Novel Mycobacterium tuberculosis-Specific cell wall protein for immunodiagnosis of tuberculosis

Krishna K. Singh, Naresh Sharma, Diana Vargas, Zhentong Liu, John T. Belisle, Visalakshi Potharaju, Ajay Wanchu, Digambar Behera, Suman Laal

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

The sequencing of the Mycobacterium tuberculosis genome revealed the existence of several genes encoding novel proteins with unknown functions, one of which is the proline-threonine repetitive protein (PTRP; Rv0538). Genomic studies of various mycobacterial species and M. tuberculosis clinical isolates demonstrate that ptrp is specific to the M. tuberculosis complex and ubiquitous in clinical isolates. Enzyme-linked immunosorbent assay, Western blot analysis, and electron microscopic evaluation of M. tuberculosis subcellular fractions and intact bacteria confirm that PTRP is a cell wall protein. Antibodies to PTRP are present in serum specimens from human immunodeficiency virus (HlV)-negative, tuberculosis (TB)-positive and HIVpositive, TB-positive patients but not purified protein derivative (PPD)-negative or PPD-positive healthy control subjects, demonstrating its diagnostic potential. Epitope mapping of PTRP delineated 4 peptides that can identify >80% of sputum smear-positive and >50% of smear-negative, HIV-negative, TB-positive patients and >80% of HIV-positive, TB-positive patients. These results demonstrate that immunodominant epitopes of carefully selected M. tuberculosis - specific proteins can be used to devise a simple peptide-based serodiagnostic test for TB.

Original languageEnglish (US)
Pages (from-to)571-581
Number of pages11
JournalJournal of Infectious Diseases
Volume200
Issue number4
DOIs
StatePublished - Aug 15 2009

ASJC Scopus subject areas

  • Immunology and Allergy
  • Infectious Diseases

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    Singh, K. K., Sharma, N., Vargas, D., Liu, Z., Belisle, J. T., Potharaju, V., Wanchu, A., Behera, D., & Laal, S. (2009). Peptides of a Novel Mycobacterium tuberculosis-Specific cell wall protein for immunodiagnosis of tuberculosis. Journal of Infectious Diseases, 200(4), 571-581. https://doi.org/10.1086/603539