Molecular characterization of the human CRT-1 creatine transporter expressed in Xenopus oocytes.

Abstract:

:The protein sequence encoded by a creatine transporter cDNA cloned from a human heart library was identical to that cloned from a human kidney library (Nash et al., Receptors Channels 2, 165-174, 1994), except that at position 285 the former contained an Ala residue and the latter contained a Pro residue. Expression of this human heart cDNA clone in Xenopus laevis oocytes induced a Na+- and Cl--dependent creatine uptake activity that saturated with a Km of approximately 20 microM for creatine. The induced uptake was inhibited by beta-guanidinopropionic acid (IC50 approximately 44.4 microM), 2-amino-1-imidazolidineacetic acid (cyclocreatine; IC50 approximately 369.8 microM), gamma-guanidinobutyric acid (IC50 approximately 697.9 microM), gamma-aminobutyric acid (IC50 approximately 6.47 mM), and amiloride (IC50 approximately 2.46 mM). The inhibitors beta-guanidinopropionic acid, cyclocreatine, and gamma-guanidinobutyric acid also inhibited the uptake activity of the Ala285 to Pro285 (A285P) mutant as effectively as that of the wild type. In contrast, guanidinoethane sulfonic acid, a potent inhibitor of taurine transport, inhibited the uptake activity of the A285P mutant approx. two times more effectively than that of the wild type. The protein kinase C activator phorbol 12-myristate 13-acetate (PMA), but not its inactive analog, 4alpha-phorbol 12, 13-didecanoate, inhibited the creatine uptake, and the inhibitory effect of PMA was both time and concentration dependent. The protein kinase A activator 8-bromo-cyclic AMP, however, had no effect on the creatine uptake. The rate of uptake increased hyperbolically with the increasing concentration of the external Cl- (equilibrium constant KCl- approximately 5 mM) and sigmoidally with the increasing concentration of the external Na+ (equilibrium constant KNa+ approximately 56 mM). Further analyses of the Na+ and Cl- concentration dependence data suggested that at least two Na+ and one Cl- were required to transport one creatine molecule via the creatine transporter.

journal_name

Arch Biochem Biophys

authors

Dai W,Vinnakota S,Qian X,Kunze DL,Sarkar HK

doi

10.1006/abbi.1998.0959

subject

Has Abstract

pub_date

1999-01-01 00:00:00

pages

75-84

issue

1

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(98)90959-6

journal_volume

361

pub_type

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