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One-step affinity purification of recombinant alphavbeta3 integrin from transfected cells
C Marcinkiewicz1, L A Rosenthal, M M Marcinkiewicz
1The Sol Sherry Thrombosis Research Center, Temple University School of Medicine, Philadelphia, Pennsylvania, 19140, USA.
Protein Expression and Purification
|August 1, 1996
Summary
We developed a simple, fast method to purify recombinant human vitronectin receptor (alphavbeta3 integrin) from CHO cells. This method yields highly pure alphavbeta3, showing better immunoreactivity than placenta-derived versions.
Area of Science:
- Cell Biology
- Protein Biochemistry
- Integrin Research
Background:
- The vitronectin receptor (alphavbeta3 integrin) plays a crucial role on various cell surfaces.
- Efficient purification of functional alphavbeta3 is essential for research and therapeutic applications.
Purpose of the Study:
- To establish a simple, fast, and reliable method for purifying recombinant human alphavbeta3 integrin.
- To characterize the purity and functionality of the purified recombinant receptor.
Main Methods:
- Transfection of Chinese hamster ovary (CHO) cells with human alphavbeta3.
- Cell lysis followed by affinity chromatography using a GRGDSPK-Sepharose column.
- Analysis of purified protein by SDS-PAGE and Western blotting with specific monoclonal antibodies.
Main Results:
- A high yield (approximately 79%) of purified recombinant alphavbeta3 was obtained.
- Purified alphavbeta3 consisted of distinct alphav and beta3 subunits and bound vitronectin, von Willebrand factor, and echistatin.
- Recombinant alphavbeta3 exhibited superior immunoreactivity with LM 609 compared to placenta-derived alphavbeta3 and lacked contaminating proteins.
Conclusions:
- The described two-step purification method effectively yields highly pure and functional recombinant human alphavbeta3 integrin.
- Recombinant alphavbeta3 purified from CHO cells offers advantages in purity and immunoreactivity over native sources.
- This method provides a valuable tool for studying alphavbeta3 integrin function and interactions.