Glucosyltransferase that adds he final branching glucose to complete the final heptasaccharide structure in the N-linked protein glycosylation pathway. [alpha-D-GalNAc-(1->4)]4-alpha-D-GalNAc-(1->3)-alpha-D-diNAcBac-tri-trans,hepta-cis-undecaprenyl diphosphate + UDP-alpha-D-glucose = [alpha-D-GalNAc-(1->4)]2-[beta-D-Glc-(1->3)]-[alpha-D-GalNAc-(1->4)]2-alpha-D-GalNAc-(1->3)-alpha-D-diNAcBac-tri-trans,hepta-cis-undecaprenyl diphosphate + H(+) + UDP Protein modification; protein glycosylation. Loss of the glucose branch in N-glycans. N-glycans however contain the entire 6-mer, demonstrating that Glc plays no role in determining the length of the GalNAc backbone. Cells show levels of colonization of chick cells similar to those of the wild type. N-linked protein glycosylation in C.jejuni consists in the transfer of a heptasaccharide (GalNAc-alpha1,4-GalNAc-alpha1,4-(Glcbeta1,3)-GalNAc-alpha1,4-GalNAc-alpha1,4-GalNAc-alpha1,3-bacillosamine) from a membrane-anchored undecaprenylpyrophosphate (Und-PP)-linked donor to the Asn side chain of proteins at the Asn-X-Ser/Thr motif. Belongs to the glycosyltransferase 2 family.