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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Biol
2018 ; 217
(5
): 1739-1755
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Phosphorylation of IRE1 at S729 regulates RIDD in B cells and antibody production
after immunization
#MMPMID29511123
Tang CH
; Chang S
; Paton AW
; Paton JC
; Gabrilovich DI
; Ploegh HL
; Del Valle JR
; Hu CC
J Cell Biol
2018[May]; 217
(5
): 1739-1755
PMID29511123
show ga
To relieve endoplasmic reticulum (ER) stress, IRE1 splices XBP1 messenger RNA
(mRNA) or engages regulated IRE1-dependent decay (RIDD) of other mRNAs. Upon XBP1
deficiency, IRE1 switches to perform RIDD. We examined IRE1 in XBP1-deficient B
cells and discovered that IRE1 undergoes phosphorylation at S729. We generated an
anti-phospho-S729 antibody to investigate such phosphorylation. Compared with
pharmacological ER stress inducers or Toll-like receptor ligands, the bacterial
subtilase cytotoxin has an unusual capability in causing rapid and strong
phosphorylation at S729 and triggering B cells to express spliced XBP1. To assess
the function of S729 in IRE1, we generated S729A knock-in mice and found S729 is
critically important for lipopolysaccharide-stimulated plasmablasts to respond to
additional ER stress and for antibody production in response to immunization. We
further crossed mice carrying an S729A mutation or ?IRE1 (missing the kinase
domain) with B cell-specific XBP1-deficient mice to trigger RIDD and discovered a
critical role for S729 in regulating RIDD in B cells.