6p1b

Transcription antitermination factor Q21

spinqualitylabelsall models 6p1b, resolution 1.94Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6p1b is a 2 chain structure with sequence from Phage 21. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.942Å Ligands: CL, EDO Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q9XJQ6_9CAUD Publication Abstract from PubMed Lambdoid bacteriophage Q protein mediates the switch from middle to late bacteriophage gene expression by enabling RNA polymerase (RNAP) to read through transcription terminators preceding bacteriophage late genes. Q loads onto RNAP engaged in promoter-proximal pausing at a Q binding element (QBE) and adjacent sigma-dependent pause element (SDPE) to yield a Q-loading complex, and Q subsequently translocates with RNAP as a pausing-deficient, termination-deficient Q-loaded complex. Here, we report high-resolution structures of 4 states on the pathway of antitermination by Q from bacteriophage 21 (Q21): Q21, the Q21-QBE complex, the Q21-loading complex, and the Q21-loaded complex. The results show that Q21 forms a torus, a "nozzle," that narrows and extends the RNAP RNA-exit channel, extruding topologically linked single-stranded RNA and preventing the formation of pause and terminator hairpins. Structural basis of Q-dependent antitermination.,Yin Z, Kaelber JT, Ebright RH Proc Natl Acad Sci U S A. 2019 Sep 10;116(37):18384-18390. doi:, 10.1073/pnas.1909801116. Epub 2019 Aug 27. PMID:31455742 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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