– May have a role in host tissue attachment, whereby ligands may include the serum protein fibronectin and small sugars. MPT51 Protein, Mycobacterium tuberculosis, Recombinant (His & SUMO) is expressed in E. coli expression system with N-6xHis-SUMO tag. The predicted molecular weight is 44.5 kDa and the accession number is P9WQN6.