Protein
Beta-1,3-N-acetylglucosaminyltransferase lunatic fringe
Function
Glycosyltransferase that initiates the elongation of O-linked fucose residues attached to EGF-like repeats in the extracellular domain of Notch molecules. Modulates NOTCH1 activity by modifying O-fucose residues at specific EGF-like domains resulting in inhibition of NOTCH1 activation by JAG1 and enhancement of NOTCH1 activation by DLL1 via an increase in its binding to DLL1 (PubMed:28089369). Decreases the binding of JAG1 to NOTCH2 but not that of DLL1 (By similarity). Essential mediator of somite segmentation and patterning. During somite boundary formation, it restricts Notch activity in the presomitic mesoderm to a boundary-forming territory in the posterior half of the prospective somite. In this region, Notch function activates a set of genes that are involved in boundary formation and in anterior-posterior somite identity (PubMed:10330372). Ectopically expressed in the thymus, Lfgn inhibits Notch signaling which results in inhibition of T-cell commitment and promotes B-cell development in lymphoid progenitors (PubMed:11520458). May play a role in boundary formation of the enamel knot (PubMed:12167404).
Similarity
Belongs to the glycosyltransferase 31 family.
Sequence
MLQRCGRRLLLALVGALLACLLVLTADPPPTPMPAERGRRALRSLAGSSGGAPASGSRAAVDPGVLTREVHSLSEYFSLLTRARRDADPPPGVASRQGDGHPRPPAEVLSPRDVFIAVKTTRKFHRARLDLLFETWISRHKEMTFIFTDGEDEALAKLTGNVVLTNCSSAHSRQALSCKMAVEYDRFIESGKKWFCHVDDDNYVNLRALLRLLASYPHTQDVYIGKPSLDRPIQATERISEHKVRPVHFWFATGGAGFCISRGLALKMGPWASGGHFMSTAERIRLPDDCTIGYIVEALLGVPLIRSGLFHSHLENLQQVPTTELHEQVTLSYGMFENKRNAVHIKGPFSVEADPSRFRSVHCHLYPDTPWCPRSAIF