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Stepwise, RNA-driven displacement of the σ-finger: ECF σ-factor σL. Crystal structures of (A) σL-RPo (PDB 6DVE; ref. 7), (B) σL-RPitc5, (this work; see SI Appendix, Table S5; ref. 7), (C) σL-RPitc6 (this work; see SI Appendix, Table S5), and (D) σL-RPitc9 (this work; see SI Appendix, Table S5). Colors and contours as in Fig. 1.
