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Molecular characterization of the orphan transporter SLC16A9, an extracellular pH- and Na+-sensitive creatine transporter.

Abstract：

:Human monocarboxylate transporters (hMCTs) mediate the transport of monocarboxylates across plasma membranes. One such transporter, hMCT9, has been shown to be related to serum uric acid levels and the risk of renal overload gout. However, the functional characteristics of hMCT9 remain unknown. The aim of this study was to investigate the expression and localization of hMCT9 using a Xenopus laevis oocyte heterologous expression system and characterize its transport properties. Kinetic analysis of hMCT9-mediated creatine uptake revealed that uptake consisted of two components, with apparent Km values of 237 mm (low-affinity) and 23.7 mm (high-affinity), respectively. The transport activity of hMCT9 was dependent on the extracellular pH and activity sharply increased with increasing pH. Under Na+-free conditions, hMCT9-mediated creatine uptake was reduced by one-half, indicating that hMCT9 is a Na+-sensitive transporter. Moreover, carbonyl cyanide 3-chlorophenylhydrazone (a protonophore) inhibited hMCT9 activity, whereas valinomycin (a K+-ionophore) did not inhibit the transporter. These results suggest that hMCT9 is susceptible to changes in H+ gradients. A cis-inhibition assay of hMCT9-and hMCT12-mediated creatine transport revealed that cyclocreatine, creatine, guanidineacetate, and 3-guanidinopropionate are recognized by the transporter, and 4-guanidinobutyrate and guanidinoethyl sulfonate selectively inhibited hMCT9 activity. These findings demonstrate that hMCT9 is an extracellular pH- and Na+-sensitive creatine transporter.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Futagi Y,Narumi K,Furugen A,Kobayashi M,Iseki K

doi

10.1016/j.bbrc.2019.11.137

subject

Has Abstract

pub_date

2020-02-05 00:00:00

pages

539-544

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(19)32265-X

journal_volume

522

pub_type

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