2026-04-14T02:37:43Zhttps://recercat.cat/oai/request

oai:recercat.cat:10230/710912025-09-06T10:53:39Zcom_2072_6col_2072_452952

00925njm 22002777a 4500 dc Bhuiyan, Tanja author Arecco, Niccolò author Mendoza Sanchez, Paulina Karen author Kim, Juhyeong author Schwan, Carsten author Weyrauch, Sophie author Nizamuddin, Sheikh author Prunotto, Andrea author Tekman, Mehmet author Biniossek, Martin L. author Knapp, Bettina author Koidl, Stefanie author Drepper, Friedel author Huesgen, Pitter F. author Grosse, Robert author Hugel, Thorsten author Arnold, Sebastian J. author 2025-09-02T06:31:20Z 2025-09-02T06:31:20Z 2025 TFIID is an essential basal transcription factor, crucial for RNA polymerase II (pol II) promoter recognition and transcription initiation. The TFIID complex consists of the TATA binding protein (TBP) and 13 TBP-associated factors (TAFs) that contain intrinsically disordered regions (IDRs) with currently unknown functions. Here, we show that a conserved IDR drives TAF2 to nuclear speckle condensates independently of other TFIID subunits. Quantitative mass spectrometry analyses reveal TAF2 proximity to RNA splicing factors including specific interactions of the TAF2 IDR with SRRM2 in nuclear speckles. Deleting the IDR from TAF2 does not majorly impact global gene expression but results in changes of alternative splicing events. Further, genome-wide binding analyses suggest that the TAF2 IDR impedes TAF2 promoter association by guiding TAF2 to nuclear speckles. This study demonstrates that an IDR within the large multiprotein complex TFIID controls nuclear compartmentalization and thus links distinct molecular processes, namely transcription initiation and RNA splicing. http://hdl.handle.net/10230/71091 CP: Molecular biology SRRM2 TAF2 TFIID Alternative splicing Biomolecular condensates Intrinsically disordered regions Nuclear bodies Nuclear speckles Transcription TAF2 condensation in nuclear speckles links basal transcription factor TFIID to RNA splicing factors