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Expression of functionally active ATP‐sensitive K‐channels in insect cells using baculovirus
Author(s) -
Mikhailov Michael V.,
Proks Peter,
Ashcroft Frances M.,
Ashcroft Stephen J.H.
Publication year - 1998
Publication title -
febs letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.593
H-Index - 257
eISSN - 1873-3468
pISSN - 0014-5793
DOI - 10.1016/s0014-5793(98)00640-1
Subject(s) - sf9 , spodoptera , kir6.2 , xenopus , biology , microbiology and biotechnology , biochemistry , chemistry , protein subunit , recombinant dna , gene
We have expressed active ATP‐sensitive K‐channels (K ATP charmels) in Spodoptera frugiperda (Sf9) cells using a baculovirus vector. A high yield of active channels was obtained on co‐infection with SUR1 and Kir6.2 engineered to contain N‐ and/or C‐terminal tags to permit detection by Western blotting. Channel activity was sensitive to ATP, glibenclamide and diazoxide. Channel activity was also obtained on expression of a C‐terminally truncated Kir6.2 (Kir6.2ΔC26): these channels were blocked by ATP but were insensitive to sulphonylureas. In contrast to Xenopus oocytes and mammalian cells the full length Kir6.2 also gave rise to active channels in Sf9 cells when expressed alone. The highest yield of active K ATP channels was obtained on infection with a fusion protein containing SUR1 linked to Kir6.2ΔC26 via a 6‐amino acid linker.