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Cloning of a Rat Kidney cDNA that Stimulates Dibasic and Neutral Amino Acid Transport and has Sequence Similarity to Glucosidases
Rebecca G. Wells and Matthias A. Hediger
Proceedings of the National Academy of Sciences of the United States of America
Vol. 89, No. 12 (Jun. 15, 1992), pp. 5596-5600
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/2359700
Page Count: 5
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The transport of amino acids across cell membranes is believed to be mediated by integral membrane proteins with distinct substrate specificities. Using expression cloning in Xenopus oocytes and assaying for the uptake of 14C-labeled cystine, we isolated a 2.3-kilobase cDNA (D2) from a rat kidney library. D2 is expressed specifically in kidney and intestine and induces the transport of both neutral and cationic amino acids. The deduced amino acid sequence predicts a 78-kDa protein with a single transmembrane domain, a structure not typical of the known membrane transport proteins, which generally have multiple membrane-spanning regions. The putative extracellular region is highly similar to the 4F2 heavy-chain cell surface antigen and to a family of α-glucosidases, which raises the possibility that D2 encodes a transport activator or regulatory subunit.
Proceedings of the National Academy of Sciences of the United States of America © 1992 National Academy of Sciences