5YIW:
reference: 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

This OCA Structure page
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