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J Biol Chem. 1986 Jul 5;261(19):9029-33.

Isolation and characterization of cDNA clones for the 35-kDa pulmonary surfactant-associated protein.


A group of 35,000-dalton sialoglycoproteins is the major non-serum protein component of pulmonary surfactant. Tryptic fragments of these proteins were sequenced, and oligonucleotide probes were synthesized based on the amino acid sequences. A human lung cDNA library was then screened using the oligonucleotide probes, and clones coding for these proteins were identified and characterized. By in vitro transcription-translation experiments we have associated individual clones with particular proteins. The data suggest that co-translational modifications of two primary translation products account for many of the isoforms observed by two-dimensional gel electrophoresis in the precursors of 35,000-dalton sialoglycoproteins.

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