Biochemical re-evaluation of GFP-tubulin expressed in mammalian cells

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Green fluorescent protein (GFP)-tagged tubulin has been widely employed to examine tubulin dynamics in living cells. In the present study, we biochemically re-evaluate the property of GFP-tubulin expressed in cells. When expressed in mammalian cells, antibodies against GFP or the amino-terminal region of tubulin detected GFP-tubulin in western blot analyses. By contrast, antibodies against the carboxyl terminal region of tubulin failed to recognize exogenous GFP-tubulin, but not endogenous tubulin. These results indicate that GFP-tubulin is partially truncated at the carboxyl terminal region and suggest that data of experiments using GFP-tubulin should be carefully analyzed.

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