功能 |
Sodium-dependent amino acid transporter. Mediates electrogenic symport of neutral amino acids and sodium ions. Has a broad specificity, with a preference for Ala, followed by His, Cys, Asn, Ser, Gly, Val, Thr, Gln and Met. May mediate sodium- independent transport of cationic amino acids, such as Arg and Lys. Amino acid uptake is pH-dependent, with low transport activities at pH 6.5, intermediate at pH 7.0 and highest between pH 7.5 and 8.5.
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總結(jié) |
SLC38A4 is found predominantly in liver and transports both cationic and neutral amino acids (1,2). The transport of cationic amino acids by SLC38A4 is sodium and pH independent, while the transport of neutral amino acids is sodium and pH dependent (2). Recent evidence suggests that SLC38A4 functions as a regulator of protein synthesis downstream of the hepatocyte nuclear factor 4a during liver development (3). It has also been suggested that SLC38A4 has ATPase activity and is critically involved in the maintenance of mitochondrial homeostasis and cell survival (4).
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