Scientific background: |
Neutral amino acid transporter A, also called SLC1A4 or ASCT1, is a protein that in humans is encodes by the SLC1A4 gene. The SLC1A4 gene is mapped to chromosome 2p14 based on an alignment of the SLC1A4 sequence with the genomic sequence (GRCh37). ASCT1 does not transport glutamate or aspartate but alanine, serine, cysteine, and threonine instead. It is found that the ASCT1 transporter functions primarily as an amino acid exchanger. Transport is associated with a chloride channel activity that is thermodynamically uncoupled from animo acid transport. This gene also exhibits sodium dependence. |
References: |
1. Arriza, J. L., Kavanaugh, M. P., Fairman, W. A., Wu, Y.-N., Murdoch, G. H., North, R. A., Amara, S. G. Cloning and expression of a human neutral amino acid transporter with structural similarity to the glutamate transporter gene family. J. Biol. Chem. 268: 15329-15332, 1993.
2. Shafqat, S., Tamarappoo, B. K., Kilberg, M. S., Puranam, R. S., McNamara, J. O., Guadano-Ferraz, A., Fremeau, R. T., Jr. Cloning and expression of a novel Na(+)-dependent neutral amino acid transporter structurally related to mammalian Na(+)/glutamate cotransporters. J. Biol. Chem. 268: 15351-15355, 1993.
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