| abstract |
PROBLEM TO BE SOLVED: To obtain a highly active PDGF analog factor by transducing a gene coding a B chain of a transfer promoter or PDGF and a gene containing a signal sequence capable of ordering secretion of the B chain to an eukaryotic cell. SOLUTION: In a method for producing a biologically active blood platelet- derived growth factor(PDGF) analog factor, a DNA component is capable of instructing expression and secretion of the biologically active PDGF analog factor in an eukaryotic cell and contains a transfer promoter and a B chain gene of PDGF on the downstream of the transfer promoter in which the gene codes a signal sequence capable of ordering the secretion of 67-175 amino acid of formula I and formula II, a B chain of human PDGF substantially homologous to the amino acids and a B chain of PDGF of the eukaryotic cell. Thereby, the chain B transduces the DNA component forming a protein having the same structure as that of PDGF and mitogen activity to a eukaryotic host cell, the host cell is grown in a medium and a product is isolated to give the objective factor. |