Regulation of the endosomal SNX27-retromer by OTULIN.
OTULIN (OTU Deubiquitinase With Linear Linkage Specificity) specifically hydrolyzes methionine1 (Met1)-linked ubiquitin chains conjugated by LUBAC (linear ubiquitin chain assembly complex). Here we report on the mass spectrometric identification of the OTULIN interactor SNX27 (sorting nexin 27), an adaptor of the endosomal retromer complex responsible for protein recycling to the cell ... surface. The C-terminal PDZ-binding motif (PDZbm) in OTULIN associates with the cargo-binding site in the PDZ domain of SNX27. By solving the structure of the OTU domain in complex with the PDZ domain, we demonstrate that a second interface contributes to the selective, high affinity interaction of OTULIN and SNX27. SNX27 does not affect OTULIN catalytic activity, OTULIN-LUBAC binding or Met1-linked ubiquitin chain homeostasis. However, via association, OTULIN antagonizes SNX27-dependent cargo loading, binding of SNX27 to the VPS26A-retromer subunit and endosome-to-plasma membrane trafficking. Thus, we define an additional, non-catalytic function of OTULIN in the regulation of SNX27-retromer assembly and recycling to the cell surface.
Mesh Terms:
Binding Sites, Crystallography, X-Ray, Endopeptidases, Endosomes, Gene Knockout Techniques, Glucose Transporter Type 1, HEK293 Cells, Humans, Models, Molecular, PDZ Domains, Protein Binding, Protein Conformation, Protein Interaction Domains and Motifs, Protein Transport, Sorting Nexins, Ubiquitination, Vesicular Transport Proteins
Binding Sites, Crystallography, X-Ray, Endopeptidases, Endosomes, Gene Knockout Techniques, Glucose Transporter Type 1, HEK293 Cells, Humans, Models, Molecular, PDZ Domains, Protein Binding, Protein Conformation, Protein Interaction Domains and Motifs, Protein Transport, Sorting Nexins, Ubiquitination, Vesicular Transport Proteins
Nat Commun
Date: Dec. 20, 2018
PubMed ID: 31541095
View in: Pubmed Google Scholar
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