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. 1997 Feb;65(2):387–394. doi: 10.1128/iai.65.2.387-394.1997

Analysis of culture filtrate and cell wall-associated antigens of Mycobacterium paratuberculosis with monoclonal antibodies.

L M Mutharia 1, W Moreno 1, M Raymond 1
PMCID: PMC174607  PMID: 9009287

Abstract

Proteins secreted by Mycobacterium species have been suggested as major immune targets in the early phase of infection. In this study, we sought to identify specific antigens in culture filtrates and in soluble cell extracts of Mycobacterium paratuberculosis. The release of antigens into the culture medium during growth of the bacilli and the distribution of specific epitopes within the Mycobacterium species were investigated by immunoblot analysis with monoclonal antibodies (MAbs) raised against M. paratuberculosis antigens. MAb B6A interacted with a cellular antigen with an apparent molecular mass of 34.5 kDa in lysates of M. paratuberculosis. MAb B6A did not interact with lysates from any other mycobacterial species, suggesting recognition of an M. paratuberculosis species-specific epitope. MAb FL1-A1 reacted with an antigen of 44.3 kDa in M. paratuberculosis and a 9-kDa antigen in Mycobacterium kansasii. MAb PII-B1 reacted with concanavalin A (ConA)-binding cellular and filtrate molecules of M. paratuberculosis and with lysates of Mycobacterium kansasii and Mycobacterium avium 18. The affinity-purified glycosylated antigens migrated as a diffuse band of between 35 and 45.6 kDa and reacted strongly with ovine and bovine paratuberculosis serum and polyclonal serum against M. tuberculosis lipoarabinomannan antigens. These glycoconjugates were the earliest antigens detected in culture filtrates of M. paratuberculosis. Deglycosylation of the ConA-binding molecules with alpha-mannosidase enzyme abolished the reaction with MAb PII-B1 and with bovine but not ovine paratuberculosis serum, suggesting selective immunogenicity in the different animal species.

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