5yiw

Caulobacter crescentus GcrA DNA-binding domain (DBD) in complex with methylated dsDNA (crystal form 2)

spinqualitylabelsall models 5yiw, resolution 1.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5yiw is a 5 chain structure with sequence from Caulobacter vibrioides NA1000 and Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.551Å Ligands: 6MA, BU3 Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A0A0H3C9J4_CAUVN Publication Abstract from PubMed Canonical bacterial transcription activators bind to non-transcribed promoter elements to increase transcription of their target genes. Here we report crystal structures of binary complexes comprising domains of Caulobacter crescentus GcrA, a noncanonical bacterial transcription factor, that support a novel mechanism for transcription activation through the preferential binding of methylated cis-regulatory elements and the promotion of open complex formation through an interaction with region 2 of the principal sigma factor, sigma70. We present crystal structures of the C-terminal, sigma factor-interacting domain (GcrA-SID) in complex with domain 2 of sigma70 (sigma702), and the N-terminal, DNA-binding domain (GcrA-DBD) in complex with methylated double-stranded DNA (dsDNA). The structures reveal interactions essential for transcription activation and DNA recognition by GcrA. These structures, along with mutational analyses, support a mechanism of transcription activation in which GcrA associates with RNA polymerase (RNAP) prior to promoter binding through GcrA-SID, arming RNAP with a flexible GcrA-DBD. The RNAP-GcrA complex then binds and activates target promoters harboring a methylated GcrA binding site either upstream or downstream of the transcription start site. Structural insights into the unique mechanism of transcription activation by Caulobacter crescentus GcrA.,Wu X, Haakonsen DL, Sanderlin AG, Liu YJ, Shen L, Zhuang N, Laub MT, Zhang Y Nucleic Acids Res. 2018 Mar 5. pii: 4920855. doi: 10.1093/nar/gky161. PMID:29514271 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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