Targeting of recombinant Na+/glucose cotransporter (SGLT1) to the apical membrane

FEBS Letters

Kong, Cheng-Te¹  Varde, Anjali¹  Lever, Julia E.¹ 

[1] Department of Biochemistry and Molecular Biology, University of Texas Medical School, PO Box 20708, Houston, TX 77225, USA

关键词: Sodium/glucose cotransport;    Transfection;    Membrane polarity;    Madin-Darby canine kidney cell;    dex;    dexamethasone;    MDCK;    Madin-Darby canine kidney;    αMGP;    α-D-methylglucopyranoside;   

DOI  :  10.1016/0014-5793(93)80363-Y

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

A full-length Na⁺/glucose cotransporter cDNA (SGLT1) from rabbit intestine was subcloned into the pMAMneo mammalian expression vector and transfected by Ca²⁺ precipitation into Madin-Darby canine kidney (MDCK) cells. Stable MDCK transfectants isolated after clonal isolation and selection in G418 exhibited dexamethasone-inducible Na⁺/glucose cotransport activity under regulation of the MMTV promoter of the vector. Transfectants expressed the recombinant 75 kDa Na⁺/glucose cotransporter subunit as shown by Western blot, and SGLT1 mRNA as shown by Northern blot, but these were undetectable in untransfected MDCK cells. Over 93% of total recombinant transport activity was targeted to the apical membrane. This indicates that the primary amino acid sequence of SGLT1 contains the information necessary to target this transporter to the apical membrane.

【 授权许可】

Unknown