Three genes encoding the secreted proteins (antigen 85-A, B, and C) of Mycobacterium avium subsp. paratuberculosis were cloned, sequenced and studied. The complete sequences of these three 85-complex proteins revealed their similarity with 85-complex proteins of other mycobacterial species. Specifically, these sequences showed 99% homology with M. avium 85-complex protein sequences. The multiple homology analysis of these sequences revealed that variations occur at only certain amino acid positions and this is true with all other 85-complex protein sequences of mycobacteria. However, the proposed three conserved regions involved in fibronectin binding in other mycobacteria were observed in N-terminal regions 85A, B and C of M. avium subsp. paratuberculosis.
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