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2015 ; 35
(8
): 1414-32
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Role of the unfolded protein response in regulating the mucin-dependent
filamentous-growth mitogen-activated protein kinase pathway
#MMPMID25666509
Adhikari H
; Vadaie N
; Chow J
; Caccamise LM
; Chavel CA
; Li B
; Bowitch A
; Stefan CJ
; Cullen PJ
Mol Cell Biol
2015[Apr]; 35
(8
): 1414-32
PMID25666509
show ga
Signaling mucins are evolutionarily conserved regulators of signal transduction
pathways. The signaling mucin Msb2p regulates the Cdc42p-dependent
mitogen-activated protein kinase (MAPK) pathway that controls filamentous growth
in yeast. The cleavage and release of the glycosylated inhibitory domain of Msb2p
is required for MAPK activation. We show here that proteolytic processing of
Msb2p was induced by underglycosylation of its extracellular domain. Cleavage of
underglycosylated Msb2p required the unfolded protein response (UPR), a quality
control (QC) pathway that operates in the endoplasmic reticulum (ER). The UPR
regulator Ire1p, which detects misfolded/underglycosylated proteins in the ER,
controlled Msb2p cleavage by regulating transcriptional induction of Yps1p, the
major protease that processes Msb2p. Accordingly, the UPR was required for
differentiation to the filamentous cell type. Cleavage of Msb2p occurred in
conditional trafficking mutants that trap secretory cargo in the endomembrane
system. Processed Msb2p was delivered to the plasma membrane, and its turnover by
the ubiquitin ligase Rsp5p and ESCRT attenuated the filamentous-growth pathway.
We speculate that the QC pathways broadly regulate signaling glycoproteins and
their cognate pathways by recognizing altered glycosylation patterns that can
occur in response to extrinsic cues.
|*MAP Kinase Signaling System
[MESH]
|*Unfolded Protein Response
[MESH]
|Glycosylation
[MESH]
|Intracellular Signaling Peptides and Proteins/chemistry/metabolism
[MESH]
|Mitogen-Activated Protein Kinases/metabolism
[MESH]