7zx7

Structure of SNAPc containing Pol II pre-initiation complex bound to U1 snRNA promoter (CC)

spinqualitylabelsall models 7zx7, resolution 3.40Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7zx7 is a 10 chain structure with sequence from Homo sapiens and Sus scrofa. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: Electron Microscopy, Resolution 3.4Å Ligands: MG, ZN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function TF2AA_HUMAN TFIIA is a component of the transcription machinery of RNA polymerase II and plays an important role in transcriptional activation. TFIIA in a complex with TBP mediates transcriptional activity. Publication Abstract from PubMed RNA polymerase II (Pol II) carries out transcription of both protein-coding and non-coding genes. Whereas Pol II initiation at protein-coding genes has been studied in detail, Pol II initiation at non-coding genes, such as small nuclear RNA (snRNA) genes, is less well understood at the structural level. Here, we study Pol II initiation at snRNA gene promoters and show that the snRNA-activating protein complex (SNAPc) enables DNA opening and transcription initiation independent of TFIIE and TFIIH in vitro. We then resolve cryo-EM structures of the SNAPc-containing Pol IIpre-initiation complex (PIC) assembled on U1 and U5 snRNA promoters. The core of SNAPc binds two turns of DNA and recognizes the snRNA promoter-specific proximal sequence element (PSE), located upstream of the TATA box-binding protein TBP. Two extensions of SNAPc, called wing-1 and wing-2, bind TFIIA and TFIIB, respectively, explaining how SNAPc directs Pol II to snRNA promoters. Comparison of structures of closed and open promoter complexes elucidates TFIIH-independent DNA opening. These results provide the structural basis of Pol II initiation at non-coding RNA gene promoters. Structural basis of SNAPc-dependent snRNA transcription initiation by RNA polymerase II.,Rengachari S, Schilbach S, Kaliyappan T, Gouge J, Zumer K, Schwarz J, Urlaub H, Dienemann C, Vannini A, Cramer P Nat Struct Mol Biol. 2022 Dec;29(12):1159-1169. doi: 10.1038/s41594-022-00857-w. , Epub 2022 Nov 24. PMID:36424526 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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