FUNCTION: Polypeptide N-acetylgalactosaminyltransferase that catalyzes the initiation of protein O-linked glycosylation and is involved in left/right asymmetry by mediating O-glycosylation of NOTCH1. O-glycosylation of NOTCH1 promotes activation of NOTCH1, modulating the balance between motile and i...
                        FUNCTION: Polypeptide N-acetylgalactosaminyltransferase that catalyzes the initiation of protein O-linked glycosylation and is involved in left/right asymmetry by mediating O-glycosylation of NOTCH1. O-glycosylation of NOTCH1 promotes activation of NOTCH1, modulating the balance between motile and immotile (sensory) cilia at the left-right organiser (LRO). Polypeptide N-acetylgalactosaminyltransferases catalyze the transfer of an N-acetyl-D-galactosamine residue to a serine or threonine residue on the protein receptor. Displays the same enzyme activity toward MUC1, MUC4, and EA2 than GALNT1. Not involved in glycosylation of erythropoietin (EPO). {ECO:0000269|PubMed:11925450, ECO:0000269|PubMed:24226769}.
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                        GO - Biological processes (BP): 
                        cilium assembly [GO:0060271]; determination of left/right symmetry [GO:0007368]; Notch receptor processing [GO:0007220]; Notch signaling involved in heart development [GO:0061314]; O-glycan processing [GO:0016266]; protein O-linked glycosylation via threonine [GO:0018243]; regulation of Notch signal...
                        cilium assembly [GO:0060271]; determination of left/right symmetry [GO:0007368]; Notch receptor processing [GO:0007220]; Notch signaling involved in heart development [GO:0061314]; O-glycan processing [GO:0016266]; protein O-linked glycosylation via threonine [GO:0018243]; regulation of Notch signaling pathway [GO:0008593]
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                        GO - Molecular function (MF): 
                        carbohydrate binding [GO:0030246]; metal ion binding [GO:0046872]; Notch binding [GO:0005112]; polypeptide N-acetylgalactosaminyltransferase activity [GO:0004653]...
                        carbohydrate binding [GO:0030246]; metal ion binding [GO:0046872]; Notch binding [GO:0005112]; polypeptide N-acetylgalactosaminyltransferase activity [GO:0004653]
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                        GO - Cellular component (CC): 
                        Golgi apparatus [GO:0005794]; Golgi membrane [GO:0000139]; integral component of membrane [GO:0016021]...
                        Golgi apparatus [GO:0005794]; Golgi membrane [GO:0000139]; integral component of membrane [GO:0016021]
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