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.
D000595:Amino Acid Sequence; D000890:Anti-Infective Agents; D001483:Base Sequence; D003001:Cloning, Molecular; D004247:DNA / Q000302:isolation & purification*; D006801:Humans; D008168:Lung / Q000378:metabolism; D008970:Molecular Weight; D010446:Peptide Fragments / Q000032:analysis; D014176:Protein Biosynthesis; D011510:Proteolipids / Q000235:genetics*; D037661:Pulmonary Surfactant-Associated Proteins; D011663:Pulmonary Surfactants / Q000235:genetics*; D014158:Transcription, Genetic; D014357:Trypsin
D000890:Anti-Infective Agents; D010446:Peptide Fragments; D011510:Proteolipids; D037661:Pulmonary Surfactant-Associated Proteins; D011663:Pulmonary Surfactants; D004247:DNA; D014357:Trypsin