Multifunctional enzyme that catalyzes a series of post-translational modifications on Lys residues in procollagen (PubMed:16447251). Plays a redundant role in catalyzing the formation of hydroxylysine residues in -Xaa-Lys-Gly- sequences in collagens (PubMed:16447251). Plays a redundant role in catalyzing the transfer of galactose onto hydroxylysine groups, giving rise to galactosyl 5-hydroxylysine (By similarity). Has an essential role by catalyzing the subsequent transfer of glucose moieties, giving rise to 1,2-glucosylgalactosyl-5-hydroxylysine residues (PubMed:16447251, PubMed:16467571, PubMed:21220425). Catalyzes hydroxylation and glycosylation of Lys residues in the MBL1 collagen-like domain, giving rise to hydroxylysine and 1,2-glucosylgalactosyl-5-hydroxylysine residues (PubMed:25419660). Catalyzes hydroxylation and glycosylation of Lys residues in the ADIPOQ collagen-like domain, giving rise to hydroxylysine and 1,2-glucosylgalactosyl-5-hydroxylysine residues (PubMed:23209641). Essential for normal biosynthesis and secretion of type IV collagens (PubMed:15377789, PubMed:16467571, PubMed:17873278). Essential for normal formation of basement membranes (PubMed:15377789, PubMed:16467571). 2-oxoglutarate + L-lysyl-[collagen] + O2 = (5R)-5-hydroxy-L-lysyl-[collagen] + CO2 + succinate (5R)-5-hydroxy-L-lysyl-[collagen] + UDP-alpha-D-galactose = (5R)-5-O-(beta-D-galactosyl)-5-hydroxy-L-lysyl-[collagen] + H(+) + UDP (5R)-5-O-(beta-D-galactosyl)-5-hydroxy-L-lysyl-[collagen] + UDP-alpha-D-glucose = (5R)-5-O-[alpha-D-glucosyl-(1->2)-beta-D-galactosyl]-5-hydroxy-L-lysyl-[collagen] + H(+) + UDP Homodimer. The majority of the secreted protein is associated with the extracellular matrix. Detected in blood serum, heart, brain, liver, kidney, lung, spleen, muscle and testis (at protein level) (PubMed:16447251). Highly expressed in the heart, lung, liver and testis (PubMed:10429951). Detected in the walls of blood vessels in placenta and embryos. Detected in chondrocytes in embryos at 14.5 dpc and in adults, in adult kidney mesangium and vascular poles of kidney glomeruli (PubMed:15377789). Detected around nerves and in the adrenal gland (PubMed:15377789). Detected in embryos (at protein level) (PubMed:16467571). Ubiquitous and strongly expressed in embryos at 8.5 to 9.5 dpc. Expression becomes more restricted during embryonic development. Highly expressed in head, eye lens and developing bones at 12.5 dpc. Expression in the eye is decreased by 14.5 dpc. Detected in capillaries and in the photoreceptor layer in the adult eye (PubMed:15377789). The N-terminal domain mediates glycosyltransferase activity. The C-terminal domain that mediates lysyl hydroxylase activity is also important for homodimerization. N-glycosylated. Full embryonic lethality. Mutant embryos are much smaller than wild-type by 9.5 dpc, and the majority are dead by 10.5 dpc. At 9.5 dpc, mutant embryos display fragmentation of basement membranes (PubMed:15377789, PubMed:16467571). The majority of the mutant embryos display dilated blood vessels, particularly in the region of the sinus venosus (PubMed:16467571). Mutant embryos display no decrease in global lysyl hydroxylase activity, due to the expression of other lysyl hydroxylases (PubMed:15377789). Mutant embryos display a nearly complete loss of procollagen glucosyltransferase activity (PubMed:15377789, PubMed:16467571).