B3GALT6

The enzyme encoded by this intronless gene is a beta-1,3-galactosyltransferase found in the medial Golgi apparatus, where it catalyzes the transfer of galactose from UDP-galactose to substrates containing a terminal beta-linked galactose moiety. The encoded enzyme has a particular affinity for galactose-beta-1,4-xylose found in the linker region of glycosamines. This enzyme is required for glycosaminoglycan synthesis.

Full Name

UDP-Gal:betaGal beta 1,3-galactosyltransferase polypeptide 6

Function

Beta-1,3-galactosyltransferase that transfers galactose from UDP-galactose to substrates with a terminal beta-linked galactose residue. Has a preference for galactose-beta-1,4-xylose that is found in the linker region of glycosaminoglycans, such as heparan sulfate and chondroitin sulfate. Has no activity towards substrates with terminal glucosamine or galactosamine residues.

Biological Process

Chondroitin sulfate biosynthetic process Source: UniProtKB-UniPathway
Glycosaminoglycan biosynthetic process Source: UniProtKB
Glycosaminoglycan metabolic process Source: Reactome
Heparan sulfate proteoglycan biosynthetic process Source: UniProtKB-UniPathway
Protein glycosylation Source: InterPro
Proteoglycan biosynthetic process Source: UniProtKB

Cellular Location

Golgi stack membrane

Involvement in disease

Ehlers-Danlos syndrome, spondylodysplastic type, 2 (EDSSPD2): A form of Ehlers-Danlos syndrome, a group of connective tissue disorders characterized by skin hyperextensibility, articular hypermobility, and tissue fragility. EDSSPD2 is an autosomal recessive form characterized by an aged appearance, developmental delay, short stature, craniofacial disproportion, generalized osteopenia, defective wound healing, hypermobile joints, hypotonic muscles, and loose but elastic skin.
Spondyloepimetaphyseal dysplasia with joint laxity, 1, with or without fractures (SEMDJL1): A bone disease characterized by vertebral abnormalities and ligamentous laxity that result in spinal misalignment and progressive severe kyphoscoliosis, thoracic asymmetry, and respiratory compromise resulting in early death. Additional skeletal features include elbow deformities with radial head dislocation, dislocated hips, clubfeet, and tapered fingers with spatulate distal phalanges. Many affected children have an oval face, flat midface, prominent eyes with blue sclerae, and a long philtrum. Palatal abnormalities and congenital heart disease are also observed.
Al-Gazali syndrome (ALGAZ): A severe disorder characterized by prenatal growth retardation, large joints contractures, camptodactyly, bilateral talipes equinovarus, small mouth, anterior segment anomalies of the eyes, and early lethality. The transmission pattern of the disorder is consistent with autosomal recessive inheritance.

Topology

Cytoplasmic: 1-11 aa
Helical: 12-34 aa
Lumenal: 35-329 aa