Nucleotide sequence of cDNA and derived amino acid sequence of human complement component C9

R. G. DiScipio, M. R. Gehring, E. R. Podack, C. C. Kan, T. E. Hugli, G. H. Fey

Research output: Contribution to journalArticlepeer-review

116 Scopus citations


The nucleotide sequence coding for the ninth component of human complement (C9) has been determined and the corresponding amino acid sequence has been derived. A human liver cDNA library was screened by the colony-hybridization technique using two radiolabeled oligonucleotide probes that correspond to known regions of the C9 amino acid sequence. Two recombinant plasmids were isolated and their cDNA inserts were sequenced. The derived protein sequence consists of 537 amino acids in a single polypeptide chain. A profile of the hydropathic index versus sequence number indicates that the amino-terminal half of C9 is predominantly hydrophilic in character whereas the carboxyl-terminal section of this protein is more hydrophobic. The amphipathic organization of the primary structure of C9 is consistent with the known potential of polymerized C9 to penetrate lipid bilayers, causing the formation of transmembrane channels.

Original languageEnglish (US)
Pages (from-to)7298-7302
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number23 I
StatePublished - 1984

ASJC Scopus subject areas

  • General


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