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Acta Biochimica et Biophysica Sinica
Year: 2009  |  Volume: 41  |  Issue: 11  |  Page No.: 929 - 937

The octarepeat region of hamster PrP (PrP51-91) enhances the formation of microtubule and antagonize Cu2+-induced microtubule-disrupting activity

X Li, C Dong, S Shi, G Wang, Y Li, X Wang, Q Shi, C Tian, R Zhou, C Gao and X. Dong    

Abstract:

Prion protein (PrP) is considered to associate with microtubule and its major component, tubulin. In the present study, octarepeat region of PrP (PrP51–91) was expressed in prokaryotic-expressing system. Using GST pull-down assay and co-immunoprecipitation, the molecular interaction between PrP51–91 and tubulin was observed. Our data also demonstrated that PrP51–91 could efficiently stimulate microtubule assembly in vitro, indicating a potential effect of PrP on microtubule dynamics. Moreover, PrP51–91 was confirmed to be able to antagonize Cu2+-induced microtubule-disrupting activity in vivo, partially protecting against Cu2+ intoxication to culture cells and stabilize cellular microtubule structure. The association of the octarepeat region of PrP with tubulin may further provide insight into the biological function of PrP in the neurons.

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