go_id,ontology,go_term,term_definition,evidence GO:0000139,CC,"Golgi membrane","The lipid bilayer surrounding any of the compartments of the Golgi apparatus.",IEA GO:0006491,BP,"N-glycan processing","The conversion of N-linked glycan (N = nitrogen) structures from the initially transferred oligosaccharide to a mature form, by the actions of glycosidases and glycosyltransferases. The early processing steps are conserved and play roles in glycoprotein folding and trafficking.",IEA GO:0008454,MF,"alpha-1,3-mannosylglycoprotein 4-beta-N-acetylglucosaminyltransferase activity","Catalysis of the reaction: UDP-N-acetyl-D-glucosamine + (N-acetyl-beta-D-glucosaminyl-1,2)-alpha-D-mannosyl-1,3-(beta-N-acetyl-D-glucosaminyl-1,2-alpha-D-mannosyl-1,6)-beta-D-mannosyl-R = UDP + N-acetyl-beta-D-glucosaminyl-1,4-(N-acetyl-D-glucosaminyl-1,2)-alpha-D-mannosyl-1,3-(beta-N-acetyl-D-glucosaminyl-1,2-alpha-D-mannosyl-1,6)-beta-D-mannosyl-R.",TAS GO:0016021,CC,"integral component of membrane","The component of a membrane consisting of the gene products and protein complexes having at least some part of their peptide sequence embedded in the hydrophobic region of the membrane.",IEA GO:0046872,MF,"metal ion binding","Interacting selectively and non-covalently with any metal ion.",IEA