glycogenin glucosyltransferase activity https://github.com/geneontology/go-ontology/issues/28070 GO:0008466 Catalysis of the reaction: UDP-glucose + glycogenin = UDP + glucosylglycogenin. This first reaction is a self glucosylation. Further UDP-glucose goups are added to the [1,4-alpha-D-glucosyl](n) group of glycogenin until a length of about 5-13 residues. Reactome:R-HSA-3814838 Reactome:R-HSA-3322025 Reactome:R-HSA-3322003 GO:0047210 glycogenin activity alpha-1,4-glucan-protein synthase (UDP-forming) activity MetaCyc:RXN-7667 UDP-glucose:glycogenin glucosyltransferase activity priming glucosyltransferase activity RHEA:56560 EC:2.4.1.186 Reactome:R-HSA-3322014 RHEA:23360 MetaCyc:GLYCOGENIN-GLUCOSYLTRANSFERASE-RXN UDP-alpha-D-glucose:glycogenin alpha-D-glucosyltransferase activity Reactome:R-HSA-3322019 1,4alpha-glucan-protein synthase (UDP-forming) activity molecular_function UDP-glucosyltransferase activity