The Golgi complex form catalyzes the production of lactose in the lactating mammary gland and could also be responsible for the synthesis of complex-type N-linked oligosaccharides in many glycoproteins as well as the carbohydrate moieties of glycolipids.
The cell surface form functions as a recognition molecule during a variety of cell to cell and cell to matrix interactions, as those occurring during development and egg fertilization, by binding to specific oligosaccharide ligands on opposing cells or in the extracellular matrix.
Subcellular locations: Golgi apparatus, Golgi stack membrane, Cell membrane, Cell surface, Cell projection, Filopodium
Found in trans cisternae of Golgi but is mainly localized at the plasma membrane . B4GALT1 cell surface expression is regulated by UBE2Q1 (By similarity).
Subcellular locations: Golgi apparatus, Golgi stack membrane
Found in trans cisternae of Golgi.
Subcellular locations: Secreted
Soluble form found in body fluids.
Ubiquitously expressed, but at very low levels in fetal and adult brain.