The function of Ensembl gene identifier ENSG00000142484 (TM4SF5, transmembrane 4 L six family member 5) is as follows. Acts as a lysosomal membrane arginine sensor (PubMed:30956113). Forms a complex with MTOR and SLC38A9 on lysosomal membranes in an arginine-regulated manner, leading to arginine efflux which enables the activation of mTORC1 which subsequently leads to RPS6KB1 and EIF4EBP1 phosphorylations (PubMed:30956113). Facilitates cell cycle G1/S phase progression and the translocation of the CDK4- CCND1 complex into the nucleus (PubMed:20399237). CDKN1B and RHOA/ROCK signaling activity are involved in TM4SF5-mediated acceleration of G1/S phase progression (PubMed:20399237). {ECO:0000269|PubMed:20399237, ECO:0000269|PubMed:30956113}.