an inverse relationship links temperature and substrate apparent affinity in the ion-coupled cotransporters rgat1 and kaat1反比关系链接温度和衬底表面的亲和力ion-coupled转运蛋白rgat1 kaat1.pdfVIP

an inverse relationship links temperature and substrate apparent affinity in the ion-coupled cotransporters rgat1 and kaat1反比关系链接温度和衬底表面的亲和力ion-coupled转运蛋白rgat1 kaat1.pdf

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an inverse relationship links temperature and substrate apparent affinity in the ion-coupled cotransporters rgat1 and kaat1反比关系链接温度和衬底表面的亲和力ion-coupled转运蛋白rgat1 kaat1

Int. J. Mol. Sci. 2012, 13, 15565-15574; doi:10.3390/ijms131215565 OPEN ACCESS International Journal of Molecular Sciences ISSN 1422-0067 /journal/ijms Article An Inverse Relationship Links Temperature and Substrate Apparent Affinity in the Ion-Coupled Cotransporters rGAT1 and KAAT1 Antonio Peres *, Alessandra Vollero, Eleonora Margheritis, Francesca D’Antoni and Elena Bossi Department of Biotechnology and Life Sciences, University of Insubria, Via Dunant, 3, 21100 Varese, Italy; E-Mails: alessandra.vollero@uninsubria.it (A.V.); eleonora.margheritis@uninsubria.it (E.M.); francesca.dantoni@uninsubria.it (F.D.); elena.bossi@uninsubria.it (E.B.) * Author to whom correspondence should be addressed; E-Mail: antonio.peres@uninsubria.it; Tel.: +39-0332-421320; Fax: +39-0332-421300. Received: 19 October 2012; in revised form: 14 November 2012 / Accepted: 15 November 2012/ Published: 22 November 2012 Abstract: The effects of temperature on the operation of two ion-coupled cotransporters of the SLC6A family, namely rat GAT1 (SLC6A1) and KAAT1 (SLC6A19) from Manduca sexta , have been studied by electrophysiological means in Xenopus laevis oocytes expressing these proteins. The maximal transport-associated current (Imax) and the apparent substrate affinity (K05) were measured. In addition to the expected increase in transport rate (Q10 = 3–6), both transporters showed greater K05 values (i.e.,

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