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Non-erythroid beta spectrin interacting proteins and their effects on spectrin tetramerization.

Cell. Mol. Biol. Lett.2011 Dec;16(4):595-609. doi:10.2478/s11658-011-0025-9. Epub 2011 Aug 24
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摘要


With yeast two-hybrid methods, we used a C-terminal fragment (residues 1697-2145) of non-erythroid beta spectrin (βII-C), including the region involved in the association with alpha spectrin to form tetramers, as the bait to screen a human brain cDNA library to identify proteins interacting with βII-C. We applied stringent selection steps to eliminate false positives and identified 17 proteins that interacted with βII-C (IP(βII-C) s). The proteins include a fragment (residues 38-284) of "THAP domain containing, apoptosis associated protein 3, isoform CRA g", "glioma tumor suppressor candidate region gene 2" (residues 1-478), a fragment (residues 74-442) of septin 8 isoform c, a fragment (residues 704-953) of "coatomer protein complex, subunit beta 1, a fragment (residues 146-614) of zinc-finger protein 251, and a fragment (residues 284-435) of syntaxin binding protein 1. We used yeast three-hybrid system to determine the effects of these βII-C interacting proteins as well as of 7 proteins previously identified to interact with the tetramerization region of non-erythroid alpha spectrin (IP(αII-N) s) [1] on spectrin tetramer formation. The results showed that 3 IP(βII-C) s were able to bind βII-C even in the presence of αII-N, and 4 IP(αII-N) s were able to bind αII-N in the presence of βII-C. We also found that the syntaxin binding protein 1 fragment abolished αII-N and βII-C interaction, suggesting that this protein may inhibit or regulate non-erythroid spectrin tetramer formation.

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