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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Cloning and analysis of cDNA encoding a major airway glycoprotein, human tracheobronchial mucin ( MUC5).

Two unique nucleotide probes for human tracheobronchial mucin glycoprotein ( TBM) were generated via polymerase chain reaction with degenerate primers deduced from the TBM:TR-3A tryptic peptide sequence and were used to isolate a 3.6 kilobase cDNA, clone NP3a, from a human nasal polyp cDNA library. Clone NP3a was localized to chromosome 11 and contained a 3168 nucleotide open reading frame which encoded three TBM peptide fragments, thus confirming that clone NP3a partially encodes TBM. TBM also contains five tandem repeats of TTVGP/S and an octapeptide GQCGTCTN, which is conserved in human intestinal mucin MUC2 and rat intestinal mucin-like protein ( MLP) suggesting that this sequence has a functional significance for secreted mucins. TBM has amino acid similarity to the cysteine-rich domains at the carboxyl termini of MUC2, rat MLP, bovine and porcine submaxillary mucins, and human von Willebrand factor. Strikingly, a large percentage of the cysteine residues in the overlaps are highly conserved: 90% in MUC2 and von Willebrand factor, 80% of bovine submaxillary mucin, 70% in porcine submaxillary mucin, and 64% in rat MLP, suggesting that conserved cysteines may be important for the tertiary structure of secreted glycoproteins. These studies demonstrate that clone NP3a is a candidate for MUC5, making it the only human mucin gene reported to date whose gene product has been isolated from airway secretions.[1]


  1. Cloning and analysis of cDNA encoding a major airway glycoprotein, human tracheobronchial mucin (MUC5). Meezaman, D., Charles, P., Daskal, E., Polymeropoulos, M.H., Martin, B.M., Rose, M.C. J. Biol. Chem. (1994) [Pubmed]
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