The two-Cys-type TetR repressor GbaA confers resistance under disulfide and electrophile stress in Staphylococcus aureus

Van Loi V, Busche T, Fritsch VN, Weise C, Gruhlke MCH, Slusarenko AJ, Kalinowski J, Antelmann H (2021)
Free Radical Biology and Medicine 177: 120-131.

Zeitschriftenaufsatz | E-Veröff. vor dem Druck | Englisch
 
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Autor*in
Van Loi, Vu; Busche, TobiasUniBi; Fritsch, Verena Nadin; Weise, Christoph; Gruhlke, Martin Clemens Horst; Slusarenko, Alan John; Kalinowski, JörnUniBi; Antelmann, Haike
Abstract / Bemerkung
Staphylococcus aureus has to cope with oxidative and electrophile stress during host-pathogen interactions. The TetR-family repressor GbaA was shown to sense electrophiles, such as N-ethylmaleimide (NEM) via monothiol mechanisms of the two conserved Cys55 or Cys104 residues in vitro. In this study, we further investigated the regulation and function of the GbaA repressor and its Cys residues in S. aureus COL. The GbaA-controlled gbaAB-SACOL2595-97 and SACOL2592-nmrA-2590 operons were shown to respond only weakly 3-10-fold to oxidants, electrophiles or antibiotics in S. aureus COL, but are 57-734-fold derepressed in the gbaA deletion mutant, indicating that the physiological inducer is still unknown. Moreover, the gbaA mutant remained responsive to disulfide and electrophile stress, pointing to additional redox control mechanisms of both operons. Thiol-stress induction of the GbaA regulon was strongly diminished in both single Cys mutants, supporting that both Cys residues are required for redox-sensing in vivo. While GbaA and the single Cys mutants are reversible oxidized under diamide and allicin stress, these thiol switches did not affect the DNA binding activity. The repressor activity of GbaA could be only partially inhibited with NEM in vitro. Survival assays revealed that the gbaA mutant confers resistance under diamide, allicin, NEM and methylglyoxal stress, which was mediated by the SACOL2592-90 operon encoding for a putative glyoxalase and oxidoreductase. Altogether, our results support that the GbaA repressor functions in the defense against oxidative and electrophile stress in S. aureus. GbaA represents a 2-Cys-type redox sensor, which requires another redox-sensing regulator and an unknown thiol-reactive ligand for full derepression of the GbaA regulon genes. Copyright © 2021 The Authors. Published by Elsevier Inc. All rights reserved.
Erscheinungsjahr
2021
Zeitschriftentitel
Free Radical Biology and Medicine
Band
177
Seite(n)
120-131
eISSN
1873-4596
Page URI
https://pub.uni-bielefeld.de/record/2958743

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Van Loi V, Busche T, Fritsch VN, et al. The two-Cys-type TetR repressor GbaA confers resistance under disulfide and electrophile stress in Staphylococcus aureus. Free Radical Biology and Medicine. 2021;177:120-131.
Van Loi, V., Busche, T., Fritsch, V. N., Weise, C., Gruhlke, M. C. H., Slusarenko, A. J., Kalinowski, J., et al. (2021). The two-Cys-type TetR repressor GbaA confers resistance under disulfide and electrophile stress in Staphylococcus aureus. Free Radical Biology and Medicine, 177, 120-131. https://doi.org/10.1016/j.freeradbiomed.2021.10.024
Van Loi, V., Busche, T., Fritsch, V. N., Weise, C., Gruhlke, M. C. H., Slusarenko, A. J., Kalinowski, J., and Antelmann, H. (2021). The two-Cys-type TetR repressor GbaA confers resistance under disulfide and electrophile stress in Staphylococcus aureus. Free Radical Biology and Medicine 177, 120-131.
Van Loi, V., et al., 2021. The two-Cys-type TetR repressor GbaA confers resistance under disulfide and electrophile stress in Staphylococcus aureus. Free Radical Biology and Medicine, 177, p 120-131.
V. Van Loi, et al., “The two-Cys-type TetR repressor GbaA confers resistance under disulfide and electrophile stress in Staphylococcus aureus”, Free Radical Biology and Medicine, vol. 177, 2021, pp. 120-131.
Van Loi, V., Busche, T., Fritsch, V.N., Weise, C., Gruhlke, M.C.H., Slusarenko, A.J., Kalinowski, J., Antelmann, H.: The two-Cys-type TetR repressor GbaA confers resistance under disulfide and electrophile stress in Staphylococcus aureus. Free Radical Biology and Medicine. 177, 120-131 (2021).
Van Loi, Vu, Busche, Tobias, Fritsch, Verena Nadin, Weise, Christoph, Gruhlke, Martin Clemens Horst, Slusarenko, Alan John, Kalinowski, Jörn, and Antelmann, Haike. “The two-Cys-type TetR repressor GbaA confers resistance under disulfide and electrophile stress in Staphylococcus aureus”. Free Radical Biology and Medicine 177 (2021): 120-131.

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