Tet-On RPE1 cell lines that expressed myc-KCTD17 or MBP-trichoplein-flag (WT or K50/57R) were established with the same procedure described previously29 (link)46 (link)47 (link). The rtTA-advanced segment and the tTS transcriptional silencer segment from pTet-On Advanced and pQC-tTS-IN (BD Clontech) were recombined into the retroviral vector pDEST-PQCXIP and pDEST-PQCXIN, respectively, by the LR reaction (Invitrogen) to generate PQCXIN-Tet-On ADV and PQCXIP-tTS. The Elongation factor 1 alpha promoter (EF) in CSII-EF-MCS (a gift from Hiroyuki Miyoshi, RIKEN BioResource Center, Tsukuba, Japan) was replaced with a Tet-responsive promoter (TRE-Tight) from pTRE-Tight (BD Clontech) followed by a modified RfA fragment (Invitrogen) to make a Tet-responsive lentivirus vector, CSII-TRE-Tight-RfA. Fusion cDNAs with siRNA-resistant KCTD17 and trichoplein were recombined into the lentiviral vector by the LR reaction (Invitrogen) to generate CSII-TRE-Tight-myc-KCTD17 and CSII-TRE-Tight-MBP-trichoplein-3xFLAG, respectively. For induction of myc-KCTD17 or MBP-trichoplein-flag, Tet-On RPE1 cells were treated with 30 or 100 ng ml−1 doxycycline (Sigma-Aldrich), respectively.
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