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2 protocols using sulfo n hydroxysuccinimide ss biotin

1

Transporters and Membrane Protein Analysis

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Phenolsulfonphthalein (PSP)
was obtained from Macklin (Shanghai, China). Estradiol-17β-glucuronide
(E17βG), estrone-3-sulfate (E3S), and taurocholate (TCA) were
purchased from Sigma-Aldrich (St. Louis, MO). 4-(4-(Dimethylamino)styryl)-N-methylpyridinium (ASP+) and penciclovir (PCV)
were from US Everbright (Suzhou, China) and Aladdin (Shanghai, China),
respectively. Dulbecco’s modified Eagle’s medium (DMEM),
PSP-free DMEM, fetal bovine serum (FBS), trypsin, Lipofectamine 2000,
sulfo-N-hydroxysuccinimide-SS-biotin,
protease inhibitor tablets, and streptavidin-agarose resin were purchased
from Thermo Fisher Scientific (Waltham, MA). Penicillin-streptomycin
was from Hyclone (Logan, UT). The bicinchoninic acid (BCA) protein
assay kit was purchased from Takara (Kyoto, Japan). The first antibodies
for detecting 6-His tag and Na+/K+-ATPase were
from Proteintech (Rosemont, IL) and Abcam (Boston, MA), respectively.
Their secondary antibodies were from Proteintech (Rosemont, IL).
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2

Cell Surface Protein Isolation

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SW480 cells were treated with sulfo-N-hydroxysuccinimide-SS-biotin (1 mg/ml in PBS; Thermo, USA) and lysed with lysis buffer. After centrifugation, the supernatants of lysates were incubated with streptavidin-agarose beads for 1 h at room temperature. After washing, cell surface proteins were recovered from the resin by incubation of the beads with 2 × laemmli buffer containing 100 mM dithiothreitol. Cell membrane proteins were then subjected to SDS-polyacrylamide gel electrophoresis and immunoblot analysis.
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