EXT1

Exostosin-1 is a protein that in humans is encoded by the "EXT1" gene.
This gene encodes one of the two endoplasmic reticulum-resident type II transmembrane glycosyltransferase – the other being EXT2 – which are involved in the chain elongation step of heparan sulfate biosynthesis. Mutations in this gene cause the type I form of Multiple Exostoses.
Interactions.
EXT1 has been shown to interact with TRAP1.