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The interactions between SspA and the ZBD of RNAP-β′ subunit. (A) The relative location among SspA, σ70R4 and upstream double strand DNA. SspA II interacted with the zinc binding domain (ZBD) from RNAP-β′ subunit. SspA II is represented as a blue transparent surface and cartoon; ZBD from RNAP-β′ subunit is represented as cartoon. (B) The detailed interactions between the β′ subunit and SspA (stereo view). Salt-bridge bonds are shown as red dashed lines.
