General Information of Drug Therapeutic Target (DTT) (ID: TTEJQT0)

DTT Name Lysosome-associated transmembrane 4b-35 protein (LAPTM4B)
Synonyms Lysosome-associated transmembrane protein 4-beta; Lysosomal-associated transmembrane protein 4B
Gene Name LAPTM4B
DTT Type
Literature-reported target
[1]
UniProt ID
LAP4B_HUMAN
TTD ID
T31603
3D Structure
Download
2D Sequence (FASTA)
Download
3D Structure (PDB)
Download
Sequence
MTSRTRVTWPSPPRPLPVPAAAAVAFGAKGTDPAEARSSRGIEEAGPRAHGRAGREPERR
RSRQQRRGGLQARRSTLLKTCARARATAPGAMKMVAPWTRFYSNSCCLCCHVRTGTILLG
VWYLIINAVVLLILLSALADPDQYNFSSSELGGDFEFMDDANMCIAIAISLLMILICAMA
TYGAYKQRAAWIIPFFCYQIFDFALNMLVAITVLIYPNSIQEYIRQLPPNFPYRDDVMSV
NPTCLVLIILLFISIILTFKGYLISCVWNCYRYINGRNSSDVLVYVTSNDTTVLLPPYDD
ATVNGAAKEPPPPYVSA
Function
Required for optimal lysosomal function. Blocks EGF-stimulated EGFR intraluminal sorting and degradation. Conversely by binding with the phosphatidylinositol 4,5-bisphosphate, regulates its PIP5K1C interaction, inhibits HGS ubiquitination and relieves LAPTM4B inhibition of EGFR degradation. Recruits SLC3A2 and SLC7A5 (the Leu transporter) to the lysosome, promoting entry of leucine and other essential amino acid (EAA) into the lysosome, stimulating activation of proton-transporting vacuolar (V)-ATPase protein pump (V-ATPase) and hence mTORC1 activation. Plays a role as negative regulator of TGFB1 production in regulatory T cells. Binds ceramide and facilitates its exit from late endosome in order to control cell death pathways.
KEGG Pathway
Lysosome (hsa04142 )

References

1 LAPTM4B-35 protein as a potential therapeutic target in gastric cancer. Tumour Biol. 2014 Dec;35(12):12737-42.