TY - JOUR
T1 - Impact of Na-translocating NADH
T2 - Quinone oxidoreductase on iron uptake and nqrM expression in Vibrio cholerae
AU - Agarwal, Shubhangi
AU - Bernt, Melanie
AU - Toulouse, Charlotte
AU - Kurz, Hannes
AU - Pfannstiel, Jens
AU - D’Alvise, Paul
AU - Hasselmann, Martin
AU - Block, Alisha M.
AU - Häse, Claudia C.
AU - Fritz, Günter
AU - Steuber, Julia
N1 - Funding Information:
This research was supported by grant FR1488/8-1 (to G.F.) and grant FR 1321/6-1 (to J.S.) from the Deutsche Forschungsgemeinschaft.
Publisher Copyright:
Copyright © 2020 American Society for Microbiology. All Rights Reserved.
PY - 2020/2/1
Y1 - 2020/2/1
N2 - The Na ion-translocating NADH:quinone oxidoreductase (NQR) from Vibrio cholerae is a membrane-bound respiratory enzyme which harbors flavins and Fe-S clusters as redox centers. The NQR is the main producer of the sodium motive force (SMF) and drives energy-dissipating processes such as flagellar rotation, substrate uptake, ATP synthesis, and cation-proton antiport. The NQR requires for its maturation, in addition to the six structural genes nqrABCDEF, a flavin attachment gene, apbE, and the nqrM gene, presumably encoding a Fe delivery protein. We here describe growth studies and quantitative real-time PCR for the V. cholerae O395N1 wild-type (wt) strain and its mutant Δnqr and ΔubiC strains, impaired in respiration. In a comparative proteome analysis, FeoB, the membrane subunit of the uptake system for Fe2 (Feo), was increased in V. cholerae nqr. In this study, the upregulation was confirmed on the mRNA level and resulted in improved growth rates of V. cholerae nqr with Fe2 as an iron source. We studied the expression of feoB on other respiratory enzyme deletion mutants such as the ubiC mutant to determine whether iron transport is specific to the absence of NQR resulting from impaired respiration. We show that the nqr operon comprises, in addition to the structural nqrABCDEF genes, the downstream apbE and nqrM genes on the same operon and demonstrate induction of the nqr operon by iron in V. cholerae wt. In contrast, expression of the nqrM gene in V. cholerae nqr is repressed by iron. The lack of functional NQR has a strong impact on iron homeostasis in V. cholerae and demonstrates that central respiratory metabolism is interwoven with iron uptake and regulation. IMPORTANCE Investigating strategies of iron acquisition, storage, and delivery in Vibrio cholerae is a prerequisite to understand how this pathogen thrives in hostile, iron-limited environments such as the human host. In addition to highlighting the maturation of the respiratory complex NQR, this study points out the influence of NQR on iron metabolism, thereby making it a potential drug target for antibiotics.
AB - The Na ion-translocating NADH:quinone oxidoreductase (NQR) from Vibrio cholerae is a membrane-bound respiratory enzyme which harbors flavins and Fe-S clusters as redox centers. The NQR is the main producer of the sodium motive force (SMF) and drives energy-dissipating processes such as flagellar rotation, substrate uptake, ATP synthesis, and cation-proton antiport. The NQR requires for its maturation, in addition to the six structural genes nqrABCDEF, a flavin attachment gene, apbE, and the nqrM gene, presumably encoding a Fe delivery protein. We here describe growth studies and quantitative real-time PCR for the V. cholerae O395N1 wild-type (wt) strain and its mutant Δnqr and ΔubiC strains, impaired in respiration. In a comparative proteome analysis, FeoB, the membrane subunit of the uptake system for Fe2 (Feo), was increased in V. cholerae nqr. In this study, the upregulation was confirmed on the mRNA level and resulted in improved growth rates of V. cholerae nqr with Fe2 as an iron source. We studied the expression of feoB on other respiratory enzyme deletion mutants such as the ubiC mutant to determine whether iron transport is specific to the absence of NQR resulting from impaired respiration. We show that the nqr operon comprises, in addition to the structural nqrABCDEF genes, the downstream apbE and nqrM genes on the same operon and demonstrate induction of the nqr operon by iron in V. cholerae wt. In contrast, expression of the nqrM gene in V. cholerae nqr is repressed by iron. The lack of functional NQR has a strong impact on iron homeostasis in V. cholerae and demonstrates that central respiratory metabolism is interwoven with iron uptake and regulation. IMPORTANCE Investigating strategies of iron acquisition, storage, and delivery in Vibrio cholerae is a prerequisite to understand how this pathogen thrives in hostile, iron-limited environments such as the human host. In addition to highlighting the maturation of the respiratory complex NQR, this study points out the influence of NQR on iron metabolism, thereby making it a potential drug target for antibiotics.
KW - Fe-S biogenesis
KW - Iron homeostasis
KW - Iron uptake
KW - Isc system
KW - NQR
KW - Na-translocating NADH:quinone oxidoreductase
KW - NqrM
KW - Quantitative RT PCR
KW - Vibrio cholerae
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U2 - 10.1128/JB.00681-19
DO - 10.1128/JB.00681-19
M3 - Article
C2 - 31712283
AN - SCOPUS:85077943645
SN - 0021-9193
VL - 202
JO - Journal of bacteriology
JF - Journal of bacteriology
IS - 3
M1 - e00681-19
ER -
