| Summary: | 碩士 === 國立中山大學 === 生物科學系研究所 === 93 === Hepatocyte growth factor (HGF) is a multifunctional protein, which secrets via Golgi complex after synthesized, and is hydrolyzed into an active heterodimer containing an α and a β chain by extracellular protease. It is known that HGF functions through surface domain of Met, and thus induces mitosis and metastasis. The interaction domain of HGF is believed to be located in the α-chain. In order to study these findings structurally and functionally, we designed and constructed four different recombinant coding regions of the gene (NK1, NK2, NK3, and NK4) which was then successfully expressed in E. coli. Purification of these four different recombinant proteins with glutathione-agarose column showed that all of the four constructs had been successfully expressed with some degradations. Cell proliferation assay showed that the recombinant proteins inhibited the growth of breast cancer cells to some extent. The assay also showed that GST-NK1 and GST-NK2 were better inhibitors than GST-NK3 and GST-NK4 to the cancer cells. It is concluded that E. coli expression is an appropriate system for achieving functional HGF.
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