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Zentrum Physiologie und Pathophysiologie, D-37073 Göttingen, Germany
Here
we review the structural and functional properties of organic anion
transporters (OAT1, OAT2, OAT3) and organic cation transporters (OCTN1,
OCTN2, OCT1, OCT2, OCT3), some of which are involved in renal proximal
tubular organic anion and cation secretion. These transporters share a
predicted 12-transmembrane domain (TMD) structure with a large
extracellular loop between TMD1 and TMD2, carrying potential
N-glycosylation sites. Conserved amino acid motifs revealed a
relationship to the sugar transporter family within the major
facilitator superfamily. Following heterologous expression, most OATs
transported the model anion p-aminohippurate (PAH). OAT1, but
not OAT2, exhibited PAH-
-ketoglutarate exchange. OCT1-3
transported the model cations tetraethylammonium (TEA), N1-methylnicotinamide, and
1-methyl-4-phenylpyridinium. OCTNs exhibited transport of TEA and/or
preferably the zwitterionic carnitine. Substrate substitution as well
as cis-inhibition experiments demonstrated polyspecificity of
the OATs, OCTs, and OCTN1. On the basis of comparison of the
structurally closely related OATs and OCTs, it may be possible to
delineate the binding sites for organic anions and cations in future experiments.
tetraethylammonium; N1-methylnicotinamide; proximal tubule; secretion
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