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- W2082561446 abstract "<h3>Abstract</h3> Transcription factors respond to multi-level stimuli and co-occupy promoter regions of target genes to activate RNA polymerase (RNAP) in a cooperative manner. To decipher the molecular mechanism, here we report two cryo-electron microscopy structures of <i>Anabaena</i> transcription activation complexes (TACs): NtcA-TAC composed of RNAP holoenzyme, promoter and a global activator NtcA, and NtcA-NtcB-TAC comprising an extra context-specific regulator NtcB. Structural analysis showed that NtcA binding makes the promoter DNA bend by ∼50º, which facilitates RNAP to contact NtcB at the distal upstream NtcB box. The sequential binding of NtcA and NtcB induces looping back of promoter DNA towards RNAP, enabling the assembly of a fully activated TAC bound with two activators. Together with biochemical assays, we propose a ‘DNA looping’ mechanism of cooperative transcription activation in bacteria." @default.
- W2082561446 created "2016-06-24" @default.
- W2082561446 creator A5021337516 @default.
- W2082561446 date "1965-07-31" @default.
- W2082561446 modified "2023-09-25" @default.
- W2082561446 title "Dangers of Radio-translucent Dental Plates" @default.
- W2082561446 doi "https://doi.org/10.1136/bmj.2.5456.302-b" @default.
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