04 April 2015 0 531 Report

I am looking for an explanation regarding ubiquitin-proteosome-system of protein degradation:

1. How is ubiquitin itself turned over? 

2. Why proteosome don't break peptide bonds in ubiquitn when Ub-target-protein conjugate enters the 20S proteosome?

3. Or ubiquitin follow N-terminal pathway of degradation?

Any thoughts?

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