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Cited by 9Metalloenzymes and iron-sulfur proteinsMetal Extraction and BioleachingMicrobial metabolism and enzyme function

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A cascade of sulfur transferases delivers sulfur to the sulfur‐oxidizing heterodisulfide reductase‐like complex

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Tanabe, Tomohisa Sebastian, Bach, Elena, D'Ermo, Giulia, Mohr, Marc Gregor, Hager, Natalie, Pfeiffer, Niklas, Guiral, Marianne, Dahl, Christiane·2024·Protein Science
DOI 10.1002/pro.5014PMC PMC11094781

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Abstract

A heterodisulfide reductase‐like complex (sHdr) and novel lipoate‐binding proteins (LbpAs) are central players of a wide‐spread pathway of dissimilatory sulfur oxidation. Bioinformatic analysis demonstrate that the cytoplasmic sHdr–LbpA systems are always accompanied by sets of sulfur transferases (DsrE proteins, TusA, and rhodaneses). The exact composition of these sets may vary depending on the organism and sHdr system type. To enable generalizations, we studied model sulfur oxidizers from distant bacterial phyla, that is, Aquificota and Pseudomonadota. DsrE3C of the chemoorganotrophic Alphaproteobacterium Hyphomicrobium denitrificans and DsrE3B from the Gammaproteobacteria Thioalkalivibrio sp. K90mix, an obligate chemolithotroph, and Thiorhodospira sibirica , an obligate photolithotroph, are homotrimers that donate sulfur to TusA. Additionally, the hyphomicrobial rhodanese‐like protein Rhd442 exchanges sulfur with both TusA and DsrE3C. The latter is essential for sulfur oxidation in Hm. denitrificans . TusA from Aquifex aeolicus (AqTusA) interacts physiologically with AqDsrE, AqLbpA, and AqsHdr proteins. This is particularly significant as it establishes a direct link between sulfur transferases and the sHdr–LbpA complex that oxidizes sulfane sulfur to sulfite. In vivo, it is unlikely that there is a strict unidirectional transfer between the sulfur‐binding enzymes studied. Rather, the sulfur transferases form a network, each with a pool of bound sulfur. Sulfur flux can then be shifted in one direction or the other depending on metabolic requirements. A single pair of sulfur‐binding proteins with a preferred transfer direction, such as a DsrE3‐type protein towards TusA, may be sufficient to push sulfur into the sink where it is further metabolized or needed.

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Figures

FIGURE 1 Representative shdr gene clusters in sulfur oxidizers. The KEGG/NCBI locus tag identifiers for the first and last genes are shown below each cluster. For Ts. sibirica, locus tags are given according to JGI IMG. Genes for TusA, DsrE2, DsrE3A, DsrE3B, and DsrE3C are indicated in dark blue, light blue, yellow, orange, and dark red, respectively. Genes for probable components of the sulfur‐oxidizing heterodisulfide reductase‐like (sHdr) complex are shaded in gray. EMO, ETF:(methyl)menaquinone oxidoreductase; Etf, electron transfer protein. EtfAB and EMO have been proposed to direct electrons stemming from sulfane sulfur oxidation to menaquinone (Kümpel et al., 2024). LbpA, lipoate‐binding protein; sLpl(AB), lipoate: protein ligase; LipS1/S2, lipoyl synthase; LipT, FAD‐binding NAD(P)H‐dependent oxidoreductase possibly delivering electrons for the LipS1/S2‐catalyzed sulfur insertion step (Kümpel et al., 2024; Tanabe et al., 2023); Rhd, rhodanese; SbdP, sulfur‐binding‐donating protein.
FIGURE 1 Representative shdr gene clusters in sulfur oxidizers. The KEGG/NCBI locus tag identifiers for the first and last genes are shown below each cluster. For Ts. sibirica, locus tags are given according to JGI IMG. Genes for TusA, DsrE2, DsrE3A, DsrE3B, and DsrE3C are indicated in dark blue, light blue, yellow, orange, and dark red, respectively. Genes for probable components of the sulfur‐oxidizing heterodisulfide reductase‐like (sHdr) complex are shaded in gray. EMO, ETF:(methyl)menaquinone oxidoreductase; Etf, electron transfer protein. EtfAB and EMO have been proposed to direct electrons stemming from sulfane sulfur oxidation to menaquinone (Kümpel et al., 2024). LbpA, lipoate‐binding protein; sLpl(AB), lipoate: protein ligase; LipS1/S2, lipoyl synthase; LipT, FAD‐binding NAD(P)H‐dependent oxidoreductase possibly delivering electrons for the LipS1/S2‐catalyzed sulfur insertion step (Kümpel et al., 2024; Tanabe et al., 2023); Rhd, rhodanese; SbdP, sulfur‐binding‐donating protein.CC BY-NC · PubMed Central
FIGURE 2 Taxonomic distribution of type I or type II sHdr systems in sulfur‐oxidizing prokaryotes. The distribution of TusA, Rhd442, and DsrE‐type sulfur transferases is also visualized. The data underlying the figure is provided in Table S1.
FIGURE 2 Taxonomic distribution of type I or type II sHdr systems in sulfur‐oxidizing prokaryotes. The distribution of TusA, Rhd442, and DsrE‐type sulfur transferases is also visualized. The data underlying the figure is provided in Table S1.CC BY-NC · PubMed Central
FIGURE 3 Sequence similarity network (SSN) and phylogenetic analyses for sulfur transferases relevant for dissimilatory sulfur oxidation. (a) SSN for the TusA family (pfam01206) members clustering at 50% identity with TusA, YedF, and YeeD from E. coli and TusA‐like proteins that are genetically linked with sHdr and/or Dsr sulfur‐oxidation systems. Connections below a threshold score of 100 were removed. (b) Maximum likelihood tree for ~100‐aa single domain rhodaneses that are encoded in synteny with DsrE2 and TusA or that are related to Rhd442 from Hm. denitrificans XT. Bootstrap values exceeding 95% are indicated by dots. (c) SSN for all DsrE‐type sequences from the representative genomes of GTDB (release R207). (d) SSN for all DsrE homologs associated with rDsr and/or sHdr systems, excluding the divergent TusD/DsrE proteins. Connections below a threshold score of 135 were removed. Ar, Archaea; Bac., Bacteria.
FIGURE 3 Sequence similarity network (SSN) and phylogenetic analyses for sulfur transferases relevant for dissimilatory sulfur oxidation. (a) SSN for the TusA family (pfam01206) members clustering at 50% identity with TusA, YedF, and YeeD from E. coli and TusA‐like proteins that are genetically linked with sHdr and/or Dsr sulfur‐oxidation systems. Connections below a threshold score of 100 were removed. (b) Maximum likelihood tree for ~100‐aa single domain rhodaneses that are encoded in synteny with DsrE2 and TusA or that are related to Rhd442 from Hm. denitrificans XT. Bootstrap values exceeding 95% are indicated by dots. (c) SSN for all DsrE‐type sequences from the representative genomes of GTDB (release R207). (d) SSN for all DsrE homologs associated with rDsr and/or sHdr systems, excluding the divergent TusD/DsrE proteins. Connections below a threshold score of 135 were removed. Ar, Archaea; Bac., Bacteria.CC BY-NC · PubMed Central
FIGURE 4 (a) Alignment of a portion of TusA and related proteins from sulfur oxidizers and E. coli. Ec, E. coli (TusA, b3470, YedF, b1930, YeeD, and b2012); Ts, Ts. sibirica (ThisiDRAFT_0966, according to JGI IMG); Tk, Thioalkalivibrio sp. K90mix (TK90_0631); Av, Ac. vinosum (Alvin_2600); Hd, Hm. denitrificans (Hden_0698); Aq, Aq. aeolicus (Aq_388a); Mc, Ms. cuprina (Mcup_0683). Triangles indicate the cysteines that were exchanged to serine in this work. Asterisk, fully conserved residues; colon, conservation between groups of strongly similar properties; dot, conservation between groups of weakly similar properties. (b) 20% SDS–PAGE of recombinant TusAs HdTusA, TkTusA, TsTusA, and AqTusA reduced with DTT. (c) 20% native PAGE of 3.5 μg recombinant TusAs HdTusA, TkTusA, and TsTusA and AqTusA as purified (−) and reduced with 5 mM DTT (+).
FIGURE 4 (a) Alignment of a portion of TusA and related proteins from sulfur oxidizers and E. coli. Ec, E. coli (TusA, b3470, YedF, b1930, YeeD, and b2012); Ts, Ts. sibirica (ThisiDRAFT_0966, according to JGI IMG); Tk, Thioalkalivibrio sp. K90mix (TK90_0631); Av, Ac. vinosum (Alvin_2600); Hd, Hm. denitrificans (Hden_0698); Aq, Aq. aeolicus (Aq_388a); Mc, Ms. cuprina (Mcup_0683). Triangles indicate the cysteines that were exchanged to serine in this work. Asterisk, fully conserved residues; colon, conservation between groups of strongly similar properties; dot, conservation between groups of weakly similar properties. (b) 20% SDS–PAGE of recombinant TusAs HdTusA, TkTusA, TsTusA, and AqTusA reduced with DTT. (c) 20% native PAGE of 3.5 μg recombinant TusAs HdTusA, TkTusA, and TsTusA and AqTusA as purified (−) and reduced with 5 mM DTT (+).CC BY-NC · PubMed Central
FIGURE 5 (a) Alignment of single domain Rhd442 from Hm. denitrificans (Hd), Hyphomicrobium sp018242215 (Hs), and AWTP1‐13‐sp008933705 (AW) with Rhd442 domains fused to sulfide: quinone oxidoreductase (SQR) from Cupriavidus sp. amp6 (Cs), Cupriavidus pinatubonensis (Cp), Pseudomonas veronii (Pa) (Xin et al., 2016). Partially and fully conserved cysteines are highlighted in yellow. Sequences conforming to the rhodanese active site sequence logos (Ran et al., 2022) are shaded in gray. Asterisk, fully conserved residues; colon, conservation between groups of strongly similar properties; dot, conservation between groups of weakly similar properties. (b) HdRhd442 Alphafold structure (green) overlayed with Rhd442 domain of Cv. pinatubonensis SQR (brown) and (c) non‐classical phosphatase from Ns. meningitidis (PDB 2F46, purple). (d) Mass spectrum of recombinant HdRhd442 as isolated. (e) HdRhd442 mass spectrum after incubation with 0.5 mM polysulfide. Note that a distinguishable signal for Rhd442 and its persulfidated species was only observable for the double ionized protein.
FIGURE 5 (a) Alignment of single domain Rhd442 from Hm. denitrificans (Hd), Hyphomicrobium sp018242215 (Hs), and AWTP1‐13‐sp008933705 (AW) with Rhd442 domains fused to sulfide: quinone oxidoreductase (SQR) from Cupriavidus sp. amp6 (Cs), Cupriavidus pinatubonensis (Cp), Pseudomonas veronii (Pa) (Xin et al., 2016). Partially and fully conserved cysteines are highlighted in yellow. Sequences conforming to the rhodanese active site sequence logos (Ran et al., 2022) are shaded in gray. Asterisk, fully conserved residues; colon, conservation between groups of strongly similar properties; dot, conservation between groups of weakly similar properties. (b) HdRhd442 Alphafold structure (green) overlayed with Rhd442 domain of Cv. pinatubonensis SQR (brown) and (c) non‐classical phosphatase from Ns. meningitidis (PDB 2F46, purple). (d) Mass spectrum of recombinant HdRhd442 as isolated. (e) HdRhd442 mass spectrum after incubation with 0.5 mM polysulfide. Note that a distinguishable signal for Rhd442 and its persulfidated species was only observable for the double ionized protein.CC BY-NC · PubMed Central
FIGURE 6 Function and properties of DsrE3B and DsrE3C proteins. (a) Gel permeation chromatography of HdDsrE3C and TkDsrE3B on Hiload 16/60 Superdex 75. (b) Native‐PAGE of 3.5 μg HdDsrE3C as purified (−) and reduced with 5 mM DTT (+). (c) Alphafold model of the HdDsrE3C trimer. (d) Specific thiosulfate (TS) oxidation rates for Hm. denitrificans ΔtsdA (light gray columns) and Hm. denitrificans ΔtsdA ΔdsrE3C (dark gray columns) at the indicated initial thiosulfate concentrations. The corresponding growth curves are provided in Figure S1. Precultures contained 2 mM thiosulfate. (e) Specific thiosulfate oxidation rates of Hm. denitrificans ΔtsdA compared to a strain lacking the complete dsrE3C gene and two strains carrying dsrE3C genes encoding the indicating cysteine to serine exchanges grown with 2.5 mM thiosulfate. Note that specific thiosulfate oxidation rates are not fully comparable to the experiments shown in (d) because the growth experiments shown here were performed in a plate reader.
FIGURE 6 Function and properties of DsrE3B and DsrE3C proteins. (a) Gel permeation chromatography of HdDsrE3C and TkDsrE3B on Hiload 16/60 Superdex 75. (b) Native‐PAGE of 3.5 μg HdDsrE3C as purified (−) and reduced with 5 mM DTT (+). (c) Alphafold model of the HdDsrE3C trimer. (d) Specific thiosulfate (TS) oxidation rates for Hm. denitrificans ΔtsdA (light gray columns) and Hm. denitrificans ΔtsdA ΔdsrE3C (dark gray columns) at the indicated initial thiosulfate concentrations. The corresponding growth curves are provided in Figure S1. Precultures contained 2 mM thiosulfate. (e) Specific thiosulfate oxidation rates of Hm. denitrificans ΔtsdA compared to a strain lacking the complete dsrE3C gene and two strains carrying dsrE3C genes encoding the indicating cysteine to serine exchanges grown with 2.5 mM thiosulfate. Note that specific thiosulfate oxidation rates are not fully comparable to the experiments shown in (d) because the growth experiments shown here were performed in a plate reader.CC BY-NC · PubMed Central
FIGURE 7 Sulfur transfer between TusA, DsrE3 proteins, and Rhd442. Sulfur transfer reaction between TusA and DsrE3B from Ts. sibirica and between Rhd442 and DsrE3C from Hm. denitrificans are shown as examples. The full set of experiments is available as Figures S2, S3, and S4. (a) Left panels: TsDsrE3B as persulfidated donor after treatment with polysulfide and unmodified reduced TsTusA as acceptor; right panels: DsrE3B (donor) and TusA (acceptor) after the transfer reaction. The TsDsrE3B species exhibiting additional 178 Da are due to glucosylation of the His‐Tagged protein (Geoghegan et al., 1999). (b) Left panels: TsTusA as persulfidated donor after treatment with polysulfide and unmodified reduced TsDsrE3B as acceptor; right panels: TsTusA and TsDsrE3B after the transfer reaction. (c) Left panels: HdRhd442 as persulfidated donor after treatment with polysulfide and unmodified reduced HdDsrE3C as acceptor. Right panels: HdRhd442 (donor) and HdDsrE3C (acceptor) after the transfer reaction. (d) Left panels: HdDsrE3C as persulfidated donor after treatment with polysulfide and unmodified reduced HdRhd442 as acceptor. Right panels: HdDsrE3C (donor) and HdRhd442 (acceptor) after the transferreaction. Note that the spectrum on the far right shows the doubly charged ion.
FIGURE 7 Sulfur transfer between TusA, DsrE3 proteins, and Rhd442. Sulfur transfer reaction between TusA and DsrE3B from Ts. sibirica and between Rhd442 and DsrE3C from Hm. denitrificans are shown as examples. The full set of experiments is available as Figures S2, S3, and S4. (a) Left panels: TsDsrE3B as persulfidated donor after treatment with polysulfide and unmodified reduced TsTusA as acceptor; right panels: DsrE3B (donor) and TusA (acceptor) after the transfer reaction. The TsDsrE3B species exhibiting additional 178 Da are due to glucosylation of the His‐Tagged protein (Geoghegan et al., 1999). (b) Left panels: TsTusA as persulfidated donor after treatment with polysulfide and unmodified reduced TsDsrE3B as acceptor; right panels: TsTusA and TsDsrE3B after the transfer reaction. (c) Left panels: HdRhd442 as persulfidated donor after treatment with polysulfide and unmodified reduced HdDsrE3C as acceptor. Right panels: HdRhd442 (donor) and HdDsrE3C (acceptor) after the transfer reaction. (d) Left panels: HdDsrE3C as persulfidated donor after treatment with polysulfide and unmodified reduced HdRhd442 as acceptor. Right panels: HdDsrE3C (donor) and HdRhd442 (acceptor) after the transferreaction. Note that the spectrum on the far right shows the doubly charged ion.CC BY-NC · PubMed Central
FIGURE 8 Re‐purification experiments of recombinant AqTusA after incubation with Aq. aeolicus soluble extract in different conditions. (a) Proteins eluted after 30 min incubation of AqTusA with Aq. aeolicus soluble extract and separated on a 18% SDS–PAGE. ‘‐’ corresponds to the proteins retained in the control experiment lacking AqTusA (extract only, negative control). ‘+’ corresponds to retained proteins after incubation of soluble cell extract with recombinant AqTusA. Equal volumes of elution fractions, corresponding to 2 and 10 μg of total protein, were loaded into the lanes. Proteins in bands 1 and 2 were analyzed by mass spectrometry (Table S5). (b) Proteins (6 μg) eluted after 10 min incubation of AqTusA with Aq. aeolicus soluble extract and separated on a 18% SDS–PAGE. (c) Proteins (6 μg) eluted after 10 min incubation of AqTusA with Aq. aeolicus soluble extract and separated on a 15% native PAGE. Proteins in band 3 were analyzed by mass spectrometry (Table S6). Molecular weight markers (kDa) for the SDS gels are shown in lanes ‘M'.
FIGURE 8 Re‐purification experiments of recombinant AqTusA after incubation with Aq. aeolicus soluble extract in different conditions. (a) Proteins eluted after 30 min incubation of AqTusA with Aq. aeolicus soluble extract and separated on a 18% SDS–PAGE. ‘‐’ corresponds to the proteins retained in the control experiment lacking AqTusA (extract only, negative control). ‘+’ corresponds to retained proteins after incubation of soluble cell extract with recombinant AqTusA. Equal volumes of elution fractions, corresponding to 2 and 10 μg of total protein, were loaded into the lanes. Proteins in bands 1 and 2 were analyzed by mass spectrometry (Table S5). (b) Proteins (6 μg) eluted after 10 min incubation of AqTusA with Aq. aeolicus soluble extract and separated on a 18% SDS–PAGE. (c) Proteins (6 μg) eluted after 10 min incubation of AqTusA with Aq. aeolicus soluble extract and separated on a 15% native PAGE. Proteins in band 3 were analyzed by mass spectrometry (Table S6). Molecular weight markers (kDa) for the SDS gels are shown in lanes ‘M'.CC BY-NC · PubMed Central
FIGURE 9 Sulfur relay systems in the four bacterial model organisms studied in this work. Hm. denitrificans oxidizes thiosulfate and dimethyl sulfide. Thiosulfate is an intermediate of DMS oxidation (Cao et al., 2018; Koch & Dahl, 2018). Aq. aeolicus (Deckert et al., 1998) and Thioalkalivibrio sp. K90mix (Muyzer et al., 2011) metabolize a wide range of inorganic sulfur substrates including thiosulfate, whereas Ts. sibirica is unable to oxidize thiosulfate (Bryantseva et al., 1999). It was originally predicted that DsrE2A from Aq. aeolicus (Aq_389) is bound to the membrane via two transmembrane segments. However, recent deep‐learning based programs like DeepTMHMM (Hallgren et al., 2022) challenge this view not only for the Aquifex protein but also for the corresponding enzymes found in Ts. sibirica and Thioalkalivibrio sp. K90mix.
FIGURE 9 Sulfur relay systems in the four bacterial model organisms studied in this work. Hm. denitrificans oxidizes thiosulfate and dimethyl sulfide. Thiosulfate is an intermediate of DMS oxidation (Cao et al., 2018; Koch & Dahl, 2018). Aq. aeolicus (Deckert et al., 1998) and Thioalkalivibrio sp. K90mix (Muyzer et al., 2011) metabolize a wide range of inorganic sulfur substrates including thiosulfate, whereas Ts. sibirica is unable to oxidize thiosulfate (Bryantseva et al., 1999). It was originally predicted that DsrE2A from Aq. aeolicus (Aq_389) is bound to the membrane via two transmembrane segments. However, recent deep‐learning based programs like DeepTMHMM (Hallgren et al., 2022) challenge this view not only for the Aquifex protein but also for the corresponding enzymes found in Ts. sibirica and Thioalkalivibrio sp. K90mix.CC BY-NC · PubMed Central

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Metadata

Authors
Tanabe, T. S., Bach, E., D'Ermo, G., Mohr, M. G., Hager, N., Pfeiffer, N., Guiral, M., & Dahl, C.
Affiliations
  • University of Vienna (AT)
  • University of Bonn (DE)
  • CNRS, Bioénergétique et Ingénierie des Protéines, Aix Marseille Université, IMM Marseille France
  • Centre National de la Recherche Scientifique (FR)
Corresponding author
Dahl, Christiane
ORCID
Venue
Protein Science
Publisher
Wiley
Published
2024-05-15
Volume
33
Issue
6
Pages
e5014-e5014
ISSN
  • 0961-8368 (ISSN-L)
  • 1469-896X
DOI
10.1002/pro.5014
PMC
PMC11094781
OpenAlex
W4396937845
Cited by
9
References
74
Citations by year
2026: 4 · 2025: 3 · 2024: 2
FWCI
0.60
Type
journal article
Language
en
Open access
Licence
Locations
  • Protein Science (publishedVersion, cc-by-nc)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • HAL (submittedVersion, cc-by-nc)
  • bonndoc (University of Bonn) (submittedVersion)
  • bonndoc (University of Bonn)
Funders
  • Deutscher Akademischer Austauschdienst (57388731, 40444VM)
  • Studienstiftung des Deutschen Volkes
  • Deutsche Forschungsgemeinschaft (351/13‐1)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Metalloenzymes and iron-sulfur proteins
  • Physical Sciences › Materials Science › Metals and Alloys › Metal Extraction and Bioleaching
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Microbial metabolism and enzyme function
Keywords
Tusa, rhodanese, sulfur fluxes, sulfane sulfur, sulfite, Thioalkalivibrio, Aquifex aeolicus
MeSH terms
Bacterial Proteins, Oxidation-Reduction, Oxidoreductases, Sulfur, Sulfurtransferases

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Tanabe, T. S., Bach, E., D'Ermo, G., Mohr, M. G., Hager, N., Pfeiffer, N., Guiral, M., & Dahl, C. (2024). A cascade of sulfur transferases delivers sulfur to the sulfur‐oxidizing heterodisulfide reductase‐like complex. Protein Science. https://doi.org/10.1002/pro.5014

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