Filamin B is a target for ISGylation.

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Filamin B is a target for ISGylation. Filamin B is a target for ISGylation. (A) A549 cells were incubated for 48 h with or without 1,000 U/ml of IFNβ. Cell lysates were immunoprecipitated (IP) with filamin B or filamin A antibodies, followed by immunoblot with ISG15 antibodies. They were also probed directly with ISG15 antibodies. (B) HisMax (HM)‐c‐filamin B were expressed with Flag–ISG15gg or Flag–ISG15aa. E1 and E2 were also expressed by co‐transfection of cells with pcDNA‐UBE1L and pcDNA‐Myc–UBCH8, respectively. Cell lysates were immunoprecipitated with Flag antibodies, followed by immunoblot with Xpress antibodies. Cell lysates were also subjected to NTA pull‐down (PD: NTA) under denaturing conditions followed by immunoblot with Xpress or Flag antibodies. (C) HM–c‐filamin B, Flag–ISG15 and UBP43 were expressed with E1 and E2 as indicated. Cell lysates were then subjected to NTA pull‐down as in (B). c‐Filamin B, the carboxy‐terminal H1–R24 region of filamin B; IFN, interferon; ISG, interferon‐stimulated gene; NTA, nitrilotriacetic acid; UBC, ubiquitin‐conjugating enzyme; UBE1L, ubiquitin‐activating enzyme E1‐like; UBP43, ubiquitin‐specific processing protease 43. Young Joo Jeon et al. EMBO Rep. 2009;10:374-380 © as stated in the article, figure or figure legend