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• W2960842337 abstract "The lysosomal amino acid transporter SLC38A9 is referred to as transceptor, i.e. a transporter with a receptor function. The protein is responsible for coupling amino acid transport across the lysosomal membrane according to the substrate availability to mTORC1 signal transduction. This process allows cells to sense amino acid level responding to growth stimuli in physiological and pathological conditions triggering mTOR regulation. The main substrates underlying this function are glutamine and arginine. The functional and kinetic characterization of glutamine and arginine transport was performed using human SLC38A9 produced in E. coli, purified by affinity chromatography and reconstituted in liposomes. A cooperative behaviour for the wild type protein was revealed for both the substrates. A novel Na+ binding site, namely T453, was described by combined approaches of bioinformatics, site-directed mutagenesis and transport assay. Stimulation by cholesterol of glutamine and arginine transport was observed. The biological function of SLC38A9 relies on the interaction between its N-terminus and components of the mTOR complex; a deletion mutant of the N-terminus tail was produced and transport of glutamine was assayed revealing that this portion does not play any role in the intrinsic transport function of the human SLC38A9. Different features for glutamine and arginine transport were revealed: human SLC38A9 is competent for glutamine efflux, while that of arginine is negligible. In line with these results, imposed ∆pH stimulated glutamine, not arginine transport. Arginine plays, on the contrary, a modulatory function and is able to stimulate glutamine efflux. Interestingly, reciprocal inhibition experiments also supported by bioinformatics, suggested that glutamine and arginine may bind to different sites in the human SLC38A9 transporter." @default.
• W2960842337 created "2019-07-23" @default.
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• W2960842337 date "2019-09-01" @default.
• W2960842337 modified "2023-09-26" @default.
• W2960842337 title "Insights into the transport side of the human SLC38A9 transceptor" @default.
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• W2960842337 doi "https://doi.org/10.1016/j.bbamem.2019.07.006" @default.
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