Lactose synthesis

Summary
Organism
Homo sapiens (human)
Reactome
R-HSA-5653890
PubChem
R-HSA-5653890
Description
  • Synthesis of the disaccharide lactose takes place within the Golgi apparatus of epithelial cells of the lactating mammary gland. The synthesis itself is a single chemical reaction of free glucose and UDP-galactose to form lactose and UDP. For this reaction to occur, glucose is transported from the cytosol into the Golgi lumen, and B4GALT1 interacts with LALBA (alpha-lactalbumin) to modulate its substrate specificity (Brew and Hill 1975).
Click on a node on the pathway to see its details. Glycoproteins are marked with a glycoprotein icon in their name.
Displaying all 3 entries
UniProt ID Protein Name Gene Symbol Pathway Viewer
P00709 Alpha-lactalbumin
  • LALBA
  • LYZL7
view
P11166 Solute carrier family 2, facilitated glucose transporter member 1
  • GLUT1
  • SLC2A1
view
P15291 Beta-1,4-galactosyltransferase 1
  • B4GALT1
  • GGTB2
view
Displaying all 2 entries
GlyTouCan ID KEGG GLYCAN ChEBI Pathway Viewer
G15021LG
view
G74621DY
view

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Acknowledgements

Supported by JST NBDC Grant Number JPMJND2204

Partly supported by NIH Common Fund Grant #1U01GM125267-01


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Last updated: April 6, 2026