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-Structure paper
タイトル | Structural insights into human TFIIIC promoter recognition. |
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ジャーナル・号・ページ | Sci Adv, Vol. 9, Issue 27, Page eadh2019, Year 2023 |
掲載日 | 2023年7月7日 |
著者 | Wolfram Seifert-Davila / Mathias Girbig / Luis Hauptmann / Thomas Hoffmann / Sebastian Eustermann / Christoph W Müller / |
PubMed 要旨 | Transcription factor (TF) IIIC recruits RNA polymerase (Pol) III to most of its target genes. Recognition of intragenic A- and B-box motifs in transfer RNA (tRNA) genes by TFIIIC modules τA and τB ...Transcription factor (TF) IIIC recruits RNA polymerase (Pol) III to most of its target genes. Recognition of intragenic A- and B-box motifs in transfer RNA (tRNA) genes by TFIIIC modules τA and τB is the first critical step for tRNA synthesis but is mechanistically poorly understood. Here, we report cryo-electron microscopy structures of the six-subunit human TFIIIC complex unbound and bound to a tRNA gene. The τB module recognizes the B-box via DNA shape and sequence readout through the assembly of multiple winged-helix domains. TFIIIC220 forms an integral part of both τA and τB connecting the two subcomplexes via a ~550-amino acid residue flexible linker. Our data provide a structural mechanism by which high-affinity B-box recognition anchors TFIIIC to promoter DNA and permits scanning for low-affinity A-boxes and TFIIIB for Pol III activation. |
リンク | Sci Adv / PubMed:37418517 |
手法 | EM (単粒子) |
解像度 | 3.2 - 3.8 Å |
構造データ | EMDB-16713: Local refinement map of TFIIIC TauB-DNA monomer EMDB-16714, PDB-8clj: EMDB-16715: TFIIIC TauA complex map EMDB-16716: TFIIIC TauA complex map (sample without DNA) EMDB-16717, PDB-8cll: EMDB-17446: Consensus map of TauB-DNA dimer (Nu-refinement) EMDB-17447: Local refinement map of TFIIIC TauB-DNA monomer 2 |
化合物 | ChemComp-ZN: |
由来 |
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キーワード | TRANSCRIPTION / TFIIIC / tRNA gene / B-Box promoter / DNA recognition |