[Study on PrP106-126 peptide disturbed dimeration of 14-3-3beta].

Objective: To investigate both PrP and PrP106-126 peptide effect on 14-3-3beta dimeration.

Methods: 14-3-3beta were incubated with different does recombinant PrP or PrP106-126 peptide, both 14-3-3beta dimer and polymer were separated 15% non-denaturing polyacrylamide gel electrophoresis (PAGE) and the 14-3-3 dimers were evaluated using 14-3-3beta-specific Western blotting. And then,14-3-3beta dimeration buffer were incubated with different does recombinant PrP and 250 micromol/L PrP106-126 peptide, 14-3-3beta dimer and polymer were detected by above methods. Cellular 14-3-3 dimer were also detected after PrP106-126 peptide were added to HeLa cell for 8 hours.

Results: Recombinant full-length PrP facilitated the dimerization of 14-3-3beta and PrP106-126 disturbed 14-3-3beta dimeration as both have dose dependence effect. PrP antagonized PrP106-126-induced 14-3-3beta dimer with PrP protein increase in vitro. Cellular 14-3-3 dimerization also decreased after treatment of peptide PrP106-126 on HeLa cells for 8 hours.

Conclusion: [corrected] Dimerization process of 14-3-3beta was promoted by full-length PrP (PrP23-231) but inhibited by peptide PrP106-126 in vitro. PrP agonized PrP106-126-induced inhibition of 14-3-3 dimeration. PrP106-126 inhibited cellular 14-3-3 dimerization.