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2017 ; 355
(6322
): 298-302
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Mechanistic basis for a molecular triage reaction
#MMPMID28104892
Shao S
; Rodrigo-Brenni MC
; Kivlen MH
; Hegde RS
Science
2017[Jan]; 355
(6322
): 298-302
PMID28104892
show ga
Newly synthesized proteins are triaged between biosynthesis and degradation to
maintain cellular homeostasis, but the decision-making mechanisms are unclear. We
reconstituted the core reactions for membrane targeting and ubiquitination of
nascent tail-anchored membrane proteins to understand how their fate is
determined. The central six-component triage system is divided into an
uncommitted client-SGTA complex, a self-sufficient targeting module, and an
embedded but self-sufficient quality control module. Client-SGTA engagement of
the targeting module induces rapid, private, and committed client transfer to
TRC40 for successful biosynthesis. Commitment to ubiquitination is dictated
primarily by comparatively slower client dissociation from SGTA and nonprivate
capture by the BAG6 subunit of the quality control module. Our results provide a
paradigm for how priority and time are encoded within a multichaperone triage
system.