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- W2260997035 abstract "SCUBE1 (S1), a secreted and membrane-bound glycoprotein, has a modular protein structure composed of an N-terminal signal peptide sequence followed by nine epidermal growth factor (EGF)-like repeats, a spacer region and three cysteine-rich (CR) motifs with multiple potential N-linked glycosylation sites, and one CUB domain at the C-terminus. Soluble S1 is a biomarker of platelet activation but an active participant of thrombosis via its adhesive EGF-like repeats, whereas its membrane-associated form acts as a bone morphogenetic protein (BMP) co-receptor in promoting BMP signal activity. However, the mechanism responsible for the membrane tethering and the biological importance of N-glycosylation of S1 remain largely unknown. In the present study, molecular mapping analysis identified a polycationic segment (amino acids 501–550) in the spacer region required for its membrane tethering via electrostatic interactions possibly with the anionic heparan sulfate proteoglycans. Furthermore, deglycosylation by peptide N-glycosidase F treatment revealed that N-glycans within the CR motif are essential for membrane recruitment through lectin-mediated surface retention. Injection of mRNA encoding zebrafish wild-type but not N-glycan-deficient scube1 restores the expression of haematopoietic and erythroid markers (scl and gata1) in scube1-knockdown embryos. We describe novel mechanisms in targeting S1 to the plasma membrane and demonstrate that N-glycans are required for S1 functions during primitive haematopoiesis in zebrafish." @default.
- W2260997035 created "2016-06-24" @default.
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- W2260997035 date "2016-02-24" @default.
- W2260997035 modified "2023-10-16" @default.
- W2260997035 title "Electrostatics and N-glycan-mediated membrane tethering of SCUBE1 is critical for promoting bone morphogenetic protein signalling" @default.
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- W2260997035 doi "https://doi.org/10.1042/bj20151041" @default.
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