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. 2022 Apr;60(4):387-394.
doi: 10.1007/s12275-022-1667-1. Epub 2022 Mar 28.

Characterization of components of a reducing system for SoxR in the cytoplasmic membrane of Escherichia coli

Kang-Lok Lee  1 , Kyung-Chang Lee  2 , Joon-Hee Lee  3 , Jung-Hye Roe  2
Affiliations

Characterization of components of a reducing system for SoxR in the cytoplasmic membrane of Escherichia coli

Kang-Lok Lee et al. J Microbiol. 2022 Apr.

Abstract

A reducing system of SoxR, a regulator of redox-active molecules, was identified as rsxABCDGE gene products and RseC in Escherichia coli through genetic studies. We found that ApbE was an additional component of the reducer system. Bacterial two hybrid analysis revealed that these proteins indeed had multiple interactions among themselves. RseC and RsxB formed the core of the complex, interacting with more than five other components. RsxC, the only cytoplasmic component of the system, interacted with SoxR. It might be linked with the rest of the complex via RsxB. Membrane fractions containing the wild type complex but not the mutant complex reduced purified SoxR using NADH as an electron source. These results suggest that Rsx genes, RseC, and ApbE can form a complex using NAD(P)H to reduce SoxR.

Keywords: ApbE; Fe-S; NADH; Rnf; RseC; Rsx.

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