TY - JOUR
T1 - Molecular and functional characterization of intestinal Na+-dependent neutral amino acid transporter B0
AU - Kekuda, Ramesh
AU - Torres-Zamorano, Viviana
AU - Fei, You Jun
AU - Prasad, Puttur D
AU - Li, Hui W.
AU - Mader, Lisa D.
AU - Leibach, Frederick H.
AU - Ganapathy, Vadivel
PY - 1997/6
Y1 - 1997/6
N2 - We have cloned the Na+-dependent neutral amino acid transporter B0 (ATB0) from rabbit jejunum and from the human intestinal cell line Caco-2. Rabbit intestinal ATB0 (riATB0) cDNA codes for a protein of 541 amino acids with 10 potential transmembrane domains. When expressed in HeLa cells, riATB0 mediates the transport of several neutral amino acids, including glutamine, in a Na+-dependent manner. Anionic amino acids, cationic amino acids, and N-methylated amino acids are excluded by riATB0. When expressed in Xenopus laevis oocytes, riATB0 increases the transport of neutral amino acids severalfold. The induced transport activity is specific for neutral amino acids, with no noticeable interaction with anionic, cationic, and N- methylated amino acids. However, riATB0 does interact with anionic amino acids at acidic pH. In oocytes expressing riATB0, the neutral amino acid threonine evokes inward currents at a holding potential of -50 mV. The amino acid-evoked current is sensitive to membrane potential. The inward current increases as the membrane potential is hyperpolarized, but the current reverses at about -30 to -40 mV. Threonine evokes outward currents if the membrane potential is depolarized beyond this value. We have also cloned the ATB0 from the human intestinal cell line Caco-2. The Caco-2 ATB0 cDNA also codes for a protein of 541 amino acids that is essentially identical to the ATB0 expressed in the human choriocarcinoma cell line JAR. Reverse transcription-polymerase chain reaction (RT-PCR) and restriction analysis of the RT-PCR products indicate that the human intestine and the human kidney proximal tubular cell line HKPT express an ATB0 identical to the ATB0 expressed in Caco-2 cells.
AB - We have cloned the Na+-dependent neutral amino acid transporter B0 (ATB0) from rabbit jejunum and from the human intestinal cell line Caco-2. Rabbit intestinal ATB0 (riATB0) cDNA codes for a protein of 541 amino acids with 10 potential transmembrane domains. When expressed in HeLa cells, riATB0 mediates the transport of several neutral amino acids, including glutamine, in a Na+-dependent manner. Anionic amino acids, cationic amino acids, and N-methylated amino acids are excluded by riATB0. When expressed in Xenopus laevis oocytes, riATB0 increases the transport of neutral amino acids severalfold. The induced transport activity is specific for neutral amino acids, with no noticeable interaction with anionic, cationic, and N- methylated amino acids. However, riATB0 does interact with anionic amino acids at acidic pH. In oocytes expressing riATB0, the neutral amino acid threonine evokes inward currents at a holding potential of -50 mV. The amino acid-evoked current is sensitive to membrane potential. The inward current increases as the membrane potential is hyperpolarized, but the current reverses at about -30 to -40 mV. Threonine evokes outward currents if the membrane potential is depolarized beyond this value. We have also cloned the ATB0 from the human intestinal cell line Caco-2. The Caco-2 ATB0 cDNA also codes for a protein of 541 amino acids that is essentially identical to the ATB0 expressed in the human choriocarcinoma cell line JAR. Reverse transcription-polymerase chain reaction (RT-PCR) and restriction analysis of the RT-PCR products indicate that the human intestine and the human kidney proximal tubular cell line HKPT express an ATB0 identical to the ATB0 expressed in Caco-2 cells.
KW - Hartnup disease
KW - Intestine
KW - Primary structure
KW - System B
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UR - http://www.scopus.com/inward/citedby.url?scp=0030761681&partnerID=8YFLogxK
U2 - 10.1152/ajpgi.1997.272.6.g1463
DO - 10.1152/ajpgi.1997.272.6.g1463
M3 - Article
C2 - 9227483
AN - SCOPUS:0030761681
SN - 0193-1857
VL - 272
SP - G1463-G1472
JO - American Journal of Physiology - Gastrointestinal and Liver Physiology
JF - American Journal of Physiology - Gastrointestinal and Liver Physiology
IS - 6 35-6
ER -