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Detailed Dissection of UBE3A-Mediated DDI1 Ubiquitination
Discussion Poly-ubiquitinated proteins targeted for degradation might be recognized directly by proteasomal receptors or by proteasomal shuttling proteins. The first shuttling proteins – Ddi1, Rad23 and Dsk2 – were identified and characterized in Saccharomyces cerevisiae (Lambertson et al., 1999; Kaplun et al., 2005). Proteasomal shuttles contain an N-terminal ubiquitin-like (UBL) domain that interacts with the 26S proteasome (Finley, 2009), and a C-terminal ubiquitin-binding domain domain (UBD) that binds to ubiquitin or poly-ubiquitin chains (Bertolaet et al., 2001). When ubiquitinated, substrates are capt...
Source: Frontiers in Physiology - May 2, 2019 Category: Physiology Source Type: research