A peptide mimetic of the mycobacterial mannosylated lipoarabinomannan: Characterization and potential applications

Ayelet Barenholz*, Avi Hai Hovav, Yolanta Fishman, Galia Rahav, Jonathan M. Gershoni, Hervé Bercovier

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Mannosylated lipoarabinomannan (ManLAM), a complex lipoglycan, is a major component of Mycobacterium tuberculosis, the agent of tuberculosis (TB), and is an antigen used for serological diagnosis of TB. Screening random phage-display peptide libraries with anti-ManLAM mAb CS40 for peptide epitope mimics (mimotopes) led to the isolation of a panel of peptides. One of these peptides (B11) was characterized as a ManLAM mimotope: it bound the anti-ManLAM CS40 mAb and competed with ManLAM for antibody binding. Mice immunized with keyhole limpet haemocyanin-conjugated B11 peptide in a proper adjuvant developed antibodies that recognized ManLAM. Competition experiments demonstrated that the B11 peptide inhibited binding of mAb CS40 to ManLAM in a concentration- dependent manner. The data indicated that the affinity of CS40 mAb to B11 (KD 1.33×10-8) is higher than its affinity to ManLAM (KD 3.00×10-7). The sera of TB patients, as well as the sera of mice experimentally infected with M. tuberculosis, contained significant levels of antibodies that recognized both the B11 peptide and ManLAM. The specificity and sensitivity of the ELISA B11-based test were similar to those of the ELISA ManLAM-based test, indicating that the B11 antigen could be a good substitute for ManLAM serology for the diagnosis of TB.

Original languageAmerican English
Pages (from-to)579-586
Number of pages8
JournalJournal of Medical Microbiology
Volume56
Issue number5
DOIs
StatePublished - May 2007

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