1.Soluble-expression, purification and activity analysis of extracellular domain III of flt1.
Yinliang XIE ; Yue GU ; Rui HUANG ; Xuexia LI ; Xue DU ; Jinhong WANG ; Dongsheng XIONG ; Chunzheng YANG ; Yuanfu XU
Chinese Journal of Biotechnology 2009;25(4):580-586
To prepare a soluble human extracellular III domain of Flt1 and analyze its biological activity. The gene encoding extracellular domain III of Flt-1 was cloned into the expression vector pAZY by RT-PCR from human umbilical vein endothelial cell (HUVEC), and induced to express in Escherichia coli by low phosphoric medium, the product was purified by E-tag affinity chromatography. SDS-PAGE and Western blotting analysis showed that Flt-1 gene domain III gene was expressed in E. coli and the yield of the soluble fusion protein was about 1.10 mg/L. Enzyme-Linked ImmunoSorbent Assay (ELISA) revealed that the Flt-1 domain III was able to bind to VEGF165 dose-dependently. Monolayer denudation assay and Transwell assay showed that the fusion protein could inhibit HUVECs migration induced by conditional medium with 50 ng/mL VEGF165 and 100 ng/mL bFGF. In conclusion, Flt-1 gene domain III gene has been successfully cloned and expressed in E. coli, which will be useful in both the research on the function of Flt-1 gene domain III and preparation of anti-Flt-1 monoclonal antibody in the future.
Cloning, Molecular
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Endothelial Cells
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cytology
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metabolism
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Escherichia coli
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genetics
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metabolism
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Extracellular Space
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metabolism
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Genetic Vectors
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genetics
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Humans
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Recombinant Fusion Proteins
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genetics
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isolation & purification
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metabolism
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pharmacology
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Solubility
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Umbilical Veins
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cytology
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Vascular Endothelial Growth Factor Receptor-1
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genetics
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isolation & purification
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metabolism