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• W2063027721 abstract "Signal peptide peptidase-like 3 (SPPL3) is a Golgi-resident intramembrane-cleaving protease that is highly conserved among multicellular eukaryotes pointing to pivotal physiological functions in the Golgi network which are only beginning to emerge. Recently, SPPL3 was shown to control protein N-glycosylation, when the key branching enzyme N-acetylglucosaminyltransferase V (GnT-V) and other medial/trans Golgi glycosyltransferases were identified as first physiological SPPL3 substrates. SPPL3-mediated endoproteolysis releases the catalytic ectodomains of these enzymes from their type II membrane anchors. Protein glycosylation is a multistep process involving numerous type II membrane-bound enzymes, but it remains unclear whether only few of them are SPPL3 substrates or whether SPPL3 cleaves many of them and thereby controls protein glycosylation at multiple levels. Therefore, to systematically identify SPPL3 substrates we used Sppl3-deficient and SPPL3-overexpression cell culture models and analyzed them for changes in secreted membrane protein ectodomains using the proteomics “secretome protein enrichment with click sugars (SPECS)” method. SPECS analysis identified numerous additional new SPPL3 candidate glycoprotein substrates, several of which were biochemically validated as SPPL3 substrates. All novel SPPL3 substrates adopt a type II topology. The majority localizes to the Golgi network and is implicated in Golgi functions. Importantly, most of the novel SPPL3 substrates catalyze the modification of N-linked glycans. Others contribute to O-glycan and in particular glycosaminoglycan biosynthesis, suggesting that SPPL3 function is not restricted to N-glycosylation, but also functions in other forms of protein glycosylation. Hence, SPPL3 emerges as a crucial player of Golgi function and the newly identified SPPL3 substrates will be instrumental to investigate the molecular mechanisms underlying the physiological function of SPPL3 in the Golgi network and in vivo. Data are available via ProteomeXchange with identifier PXD001672." @default.
• W2063027721 created "2016-06-24" @default.
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• W2063027721 date "2015-06-01" @default.
• W2063027721 modified "2023-10-18" @default.
• W2063027721 title "Secretome Analysis Identifies Novel Signal Peptide Peptidase-Like 3 (SPPL3) Substrates and Reveals a Role of SPPL3 in Multiple Golgi Glycosylation Pathways*" @default.
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• W2063027721 doi "https://doi.org/10.1074/mcp.m115.048298" @default.
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