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2016 ; 7
(ä): 10239
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Tripartite degrons confer diversity and specificity on regulated protein
degradation in the ubiquitin-proteasome system
#MMPMID26732515
Guharoy M
; Bhowmick P
; Sallam M
; Tompa P
Nat Commun
2016[Jan]; 7
(ä): 10239
PMID26732515
show ga
Specific signals (degrons) regulate protein turnover mediated by the
ubiquitin-proteasome system. Here we systematically analyse known degrons and
propose a tripartite model comprising the following: (1) a primary degron
(peptide motif) that specifies substrate recognition by cognate E3 ubiquitin
ligases, (2) secondary site(s) comprising a single or multiple neighbouring
ubiquitinated lysine(s) and (3) a structurally disordered segment that initiates
substrate unfolding at the 26S proteasome. Primary degron sequences are conserved
among orthologues and occur in structurally disordered regions that undergo
E3-induced folding-on-binding. Posttranslational modifications can switch primary
degrons into E3-binding-competent states, thereby integrating degradation with
signalling pathways. Degradation-linked lysines tend to be located within
disordered segments that also initiate substrate degradation by effective
proteasomal engagement. Many characterized mutations and alternative isoforms
with abrogated degron components are implicated in disease. These effects result
from increased protein stability and interactome rewiring. The distributed nature
of degrons ensures regulation, specificity and combinatorial control of
degradation.