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2016 ; 16
(10
): 2630-2640
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The Sel1L-Hrd1 Endoplasmic Reticulum-Associated Degradation Complex Manages a Key
Checkpoint in B Cell Development
#MMPMID27568564
Ji Y
; Kim H
; Yang L
; Sha H
; Roman CA
; Long Q
; Qi L
Cell Rep
2016[Sep]; 16
(10
): 2630-2640
PMID27568564
show ga
Endoplasmic reticulum (ER)-associated degradation (ERAD) is a principal mechanism
that targets ER-associated proteins for cytosolic proteasomal degradation. Here,
our data demonstrate a critical role for the Sel1L-Hrd1 complex, the most
conserved branch of ERAD, in early B cell development. Loss of Sel1L-Hrd1 ERAD in
B cell precursors leads to a severe developmental block at the transition from
large to small pre-B cells. Mechanistically, we show that Sel1L-Hrd1 ERAD
selectively recognizes and targets the pre-B cell receptor (pre-BCR) for
proteasomal degradation in a BiP-dependent manner. The pre-BCR complex
accumulates both intracellularly and at the cell surface in Sel1L-deficient pre-B
cells, leading to persistent pre-BCR signaling and pre-B cell proliferation. This
study thus implicates ERAD mediated by Sel1L-Hrd1 as a key regulator of B cell
development and reveals the molecular mechanism underpinning the transient nature
of pre-BCR signaling.