6533b832fe1ef96bd129aea3
RESEARCH PRODUCT
A chimera carrying the functional domain of the orphan protein SLC7A14 in the backbone of SLC7A2 mediates trans-stimulated arginine transport.
Isabel JaeneckeEllen I. ClossJohanna RuppMatthias LemkeJean-paul BoisselBruno Gasniersubject
Lysosomal transportArginineRecombinant Fusion ProteinsProtein domainBiological Transport ActiveBiologyArginineBiochemistryCell LineXenopus laevisMembrane BiologyAnimalsHumansMolecular BiologySkinchemistry.chemical_classificationArginine transportCell BiologyMembrane transportFibroblastsHydrogen-Ion ConcentrationFusion proteinSolute carrier familyAmino acidProtein Structure TertiaryBiochemistrychemistryAmino Acid Transport Systems BasicLysosomesdescription
In human skin fibroblasts, a lysosomal transport system specific for cationic amino acids has been described and named system c. We asked if SLC7A14 (solute carrier family 7 member A14), an orphan protein assigned to the SLC7 subfamily of cationic amino acid transporters (CATs) due to sequence homology, may represent system c. Fusion proteins between SLC7A14 and enhanced GFP localized to intracellular vesicles, co-staining with the lysosomal marker LysoTracker(®). To perform transport studies, we first tried to redirect SLC7A14 to the plasma membrane (by mutating putative lysosomal targeting motifs) but without success. We then created a chimera carrying the backbone of human (h) CAT-2 and the protein domain of SLC7A14 corresponding to the so-called "functional domain" of the hCAT proteins, a protein stretch of 81 amino acids that determines the apparent substrate affinity, sensitivity to trans-stimulation, and (as revealed in this study) pH dependence. The chimera mediated arginine transport and exhibited characteristics similar but not identical to hCAT-2A (the low affinity hCAT-2 isoform). Western blot and microscopic analyses confirmed localization of the chimera in the plasma membrane of Xenopus laevis oocytes. Noticeably, arginine transport by the hCAT-2/SLC7A14 chimera was pH-dependent, trans-stimulated, and inhibited by α-trimethyl-L-lysine, properties assigned to lysosomal transport system c in human skin fibroblasts. Expression analysis showed strong expression of SLC7A14 mRNA in these cells. Taken together, these data strongly suggest that SLC7A14 is a lysosomal transporter for cationic amino acids.
year | journal | country | edition | language |
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2012-07-13 | The Journal of biological chemistry |