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. 2021 Feb 2;12:619387. doi: 10.3389/fmicb.2021.619387

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Copyright © 2021 Pei, Qi, Li, Wo and Ye.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Competitive binding of RegX3 and PrpR to the prpR promoter. (A) Overview of P_prpR showing the RegX3 box (shaded) and PrpR binding site (red). (B) Binding affinities of the promoter region of prpR for RegX3 and PrpR. The interactions of recombinant His-RegX3 and His-PrpR with the prpR (encoding MCS) were determined using the Octet Macromolecular Interaction Platform. The KD value of RegX3 and PrpR was 165 and 53.2 nM, respectively, which demonstrates that the PrpR has a stronger binding capacity than RegX3.