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

Cloning and expression in COS-1 cells of a full-length cDNA encoding human coagulation factor X.

A 1.5-kb cDNA (FX) encoding full-length human coagulation factor X was isolated from a human fetal liver cDNA library. The identity of the insert in a selected phage lambda clone was confirmed to be FX by nucleotide (nt) sequence analysis and restriction mapping. This FX cDNA clone contained 1467 bp of coding sequence, no 5'-untranslated sequence, a short 3'-untranslated sequence of 10 nt and a poly(A) tail at the 3'-end. The FX cDNA was inserted into a mammalian expression vector and transfected into COS-1 monkey kidney cells. Media from transfected cells showed evidence of factor X antigen and, following addition of Russel's viper venom factor X activator, enhanced amidolytic activity toward a synthetic peptide rho-nitroanilide substrate. Immunoprecipitation with an anti-factor X monoclonal antibody of [35S]methionine-labeled cell-conditioned media showed evidence of polypeptides of 74, 55, and 17 kDa, as determined by SDS-PAGE followed by autoradiography. Together, these results indicate that an active factor X can be successfully expressed in a recombinant DNA expression system. This approach will allow the systematic structure/function investigation of this important blood-clotting enzyme.[1]


  1. Cloning and expression in COS-1 cells of a full-length cDNA encoding human coagulation factor X. Messier, T.L., Pittman, D.D., Long, G.L., Kaufman, R.J., Church, W.R. Gene (1991) [Pubmed]
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