Cited by 0Bacterial Genetics and BiotechnologyMicrotubule and mitosis dynamicsAdvanced Fluorescence Microscopy Techniques

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Membrane binding controls the ATPase cycle and localization of MinD in Bacillus subtilis

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Feddersen, Helge, Dyckmans, Charlotte, Bramkamp, Marc·2026·eLife

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Abstract

Bacteria precisely regulate the place and timing of their cell division. One of the best-understood systems for division site selection is the Min system in Escherichia coli . In E. coli , the Min system displays remarkable pole-to-pole oscillation, creating a time-averaged minimum at the cell’s geometric center, which marks the future division site. Interestingly, the Gram-positive model species Bacillus subtilis also encodes homologous proteins: the cell division inhibitor MinC and the Walker-ATPase MinD. However, B. subtilis lacks the activating protein MinE, which is essential for Min dynamics in E. coli . We have shown before that the B. subtilis Min system is highly dynamic and quickly relocalizes to active sites of division. This raised questions about how Min protein dynamics are regulated on a molecular level in B. subtilis . Here, we show with a combination of in vitro experiments and in vivo single-molecule imaging that the ATPase activity of B. subtilis MinD is activated by membrane binding. Additionally, both monomeric and dimeric MinD bind to the membrane, and binding of ATP to MinD is a prerequisite for fast membrane detachment. Single-molecule localization microscopy data confirm membrane binding of monomeric MinD variants. However, only wild-type MinD enriches at cell poles and sites of ongoing division, likely due to interaction with MinJ. Monomeric MinD variants and locked dimers remain distributed along the membrane and lack the characteristic pattern formation. Single-molecule tracking data further support that MinD has a freely diffusive population, which is increased in the monomeric variants and a membrane-binding defective mutant. Thus, MinD dynamics in B. subtilis under the tested conditions do not require any unknown protein component and can be fully explained by MinD’s binding and unbinding kinetics with the membrane. The spatial organization of MinD relies on the short-lived temporal residence of MinD dimers at the membrane.

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Figure 1. Biochemical analysis of B. subtilis MinD ATPase cycle. (A) Phosphate release plotted against different MinD concentrations, fitted with a simple linear regression (R2=0.97). Phosphate release was measured using the EnzChek phosphate assay kit. Samples contained 0.2 mg ml–1 liposomes and were pre-incubated for 10 min before addition of 2 mM Mg2+-ATP; n≥3. (B) Specific activity of the MinD ATPase from (A) measured as a function of MinD concentration. (C) Specific activity of MinD measured as a function of ATP concentration, determined as in (B) with fixed MinD concentration of 10 µM. Fitting the Michaelis-Menten equation (black lines) gives kcat = 36.27 hr−1, Vmax = 19.50 nmol mg–1 min–1 and KM = 0.173 mM. (D) Specific activity of MinD measured as a function of liposome concentration, determined as in (B) with fixed MinD concentration of 6 µM. Fitting the Michaelis-Menten equation (black lines) gives kcat = 41.01 hr−1, Vmax = 22.05 nmol mg–1 min–1 and KM = 0.0437 mg ml–1.
Figure 1. Biochemical analysis of B. subtilis MinD ATPase cycle. (A) Phosphate release plotted against different MinD concentrations, fitted with a simple linear regression (R2=0.97). Phosphate release was measured using the EnzChek phosphate assay kit. Samples contained 0.2 mg ml–1 liposomes and were pre-incubated for 10 min before addition of 2 mM Mg2+-ATP; n≥3. (B) Specific activity of the MinD ATPase from (A) measured as a function of MinD concentration. (C) Specific activity of MinD measured as a function of ATP concentration, determined as in (B) with fixed MinD concentration of 10 µM. Fitting the Michaelis-Menten equation (black lines) gives kcat = 36.27 hr−1, Vmax = 19.50 nmol mg–1 min–1 and KM = 0.173 mM. (D) Specific activity of MinD measured as a function of liposome concentration, determined as in (B) with fixed MinD concentration of 6 µM. Fitting the Michaelis-Menten equation (black lines) gives kcat = 41.01 hr−1, Vmax = 22.05 nmol mg–1 min–1 and KM = 0.0437 mg ml–1.CC BY · PubMed Central
Figure 1—figure supplement 1. His-MinD purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinD (31.7 kDa), stained with Coomassie blue stain. From left to right: Ladder, pellet after lysate, supernatant, Ni-NTA peaks A2, A7, C4 (main peak), concentrated sample, gel filtration peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN).
Figure 1—figure supplement 1. His-MinD purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinD (31.7 kDa), stained with Coomassie blue stain. From left to right: Ladder, pellet after lysate, supernatant, Ni-NTA peaks A2, A7, C4 (main peak), concentrated sample, gel filtration peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN).CC BY · PubMed Central
Figure 1—figure supplement 2. Gel filtration chromatograms of His-MinD and variants. Gel filtration analysis of purified His-MinD and indicated mutants. Curves were aligned according to the respective void volume after sample injection. Green and red dotted lines mark the calibrated elution volumes corresponding to proteins of 31.69 kDa (His-MinD monomer) and 63.38 kDa (His-MinD dimer), as determined from molecular weight standards.
Figure 1—figure supplement 2. Gel filtration chromatograms of His-MinD and variants. Gel filtration analysis of purified His-MinD and indicated mutants. Curves were aligned according to the respective void volume after sample injection. Green and red dotted lines mark the calibrated elution volumes corresponding to proteins of 31.69 kDa (His-MinD monomer) and 63.38 kDa (His-MinD dimer), as determined from molecular weight standards.CC BY · PubMed Central
Figure 2. Biochemical analysis of the effect of His-MinC or His-PDZ on MinD ATPase activity. (A) Left: Specific activity of MinD measured as a function of ATP concentration. Phosphate release was measured using the EnzChek phosphate assay kit. Samples contained 6 µM His-MinD, 6 µM His-MinC, and 0.2 mg ml–1 liposomes and were pre-incubated for 10 min before addition of 2 mM Mg2+-ATP; n≥3. Fitting the Michaelis-Menten equation (black lines) gives kcat = 15.77 hr−1, Vmax = 8.30 nmol mg–1 min–1 and KM = 0.10 mM. Right: Relative activity of 6 µM His-MinD in the presence of 6 µM His-MinC (blue) compared to an internal control of 6 µM His-MinD (black, relative activity = 1). Whiskers represent SD. Specific activity of only His-MinD was 8.61 [nmol mg–1 min–1] (SD = 0.03, n=2). Relative activity of 6 µM His-MinD in the presence of 6 µM His-MinC was 0.95 with SD = 0.071 (n=3). Significance was assessed by performing Welch’s t-test on the raw data. p<0.05. (B) Left: Specific activity of MinD measured as a function of ATP concentration. Phosphate release was measured using the EnzChek phosphate assay kit. Samples contained 6 µM His-MinD, 5 µM His-PDZ, and 0.2 mg ml–1 liposomes and were pre-incubated for 10 min before addition of 2 mM Mg2+-ATP; n≥3. Fitting the Michaelis-Menten equation (black lines) gives kcat = 12.07 hr−1, Vmax = 6.35 nmol mg–1 min–1 and KM = 0.233 mM. Right: Relative activity of 6 μM His-MinD in the presence of different concentrations of His-PDZ (blue) compared to only 6 μM His-MinD (black, relative activity = 1). Whiskers represent SD. Specific activity of an internal control of His-MinD was 4.60 nmol mg–1 min–1 (SD = 0.03, n=2). Relative activities of His-MinD in the presence of 1 µM, 3 µM, and 5 µM His-PDZ were 1.22, 1.37, and 1.25 with SD = 0.07, 0.13, and 0.03, respectively (n=3 each). Significance was assessed by performing Welch’s t-test on the raw data of all samples vs. control. p<0.05 for all PDZ concentrations.
Figure 2. Biochemical analysis of the effect of His-MinC or His-PDZ on MinD ATPase activity. (A) Left: Specific activity of MinD measured as a function of ATP concentration. Phosphate release was measured using the EnzChek phosphate assay kit. Samples contained 6 µM His-MinD, 6 µM His-MinC, and 0.2 mg ml–1 liposomes and were pre-incubated for 10 min before addition of 2 mM Mg2+-ATP; n≥3. Fitting the Michaelis-Menten equation (black lines) gives kcat = 15.77 hr−1, Vmax = 8.30 nmol mg–1 min–1 and KM = 0.10 mM. Right: Relative activity of 6 µM His-MinD in the presence of 6 µM His-MinC (blue) compared to an internal control of 6 µM His-MinD (black, relative activity = 1). Whiskers represent SD. Specific activity of only His-MinD was 8.61 [nmol mg–1 min–1] (SD = 0.03, n=2). Relative activity of 6 µM His-MinD in the presence of 6 µM His-MinC was 0.95 with SD = 0.071 (n=3). Significance was assessed by performing Welch’s t-test on the raw data. p<0.05. (B) Left: Specific activity of MinD measured as a function of ATP concentration. Phosphate release was measured using the EnzChek phosphate assay kit. Samples contained 6 µM His-MinD, 5 µM His-PDZ, and 0.2 mg ml–1 liposomes and were pre-incubated for 10 min before addition of 2 mM Mg2+-ATP; n≥3. Fitting the Michaelis-Menten equation (black lines) gives kcat = 12.07 hr−1, Vmax = 6.35 nmol mg–1 min–1 and KM = 0.233 mM. Right: Relative activity of 6 μM His-MinD in the presence of different concentrations of His-PDZ (blue) compared to only 6 μM His-MinD (black, relative activity = 1). Whiskers represent SD. Specific activity of an internal control of His-MinD was 4.60 nmol mg–1 min–1 (SD = 0.03, n=2). Relative activities of His-MinD in the presence of 1 µM, 3 µM, and 5 µM His-PDZ were 1.22, 1.37, and 1.25 with SD = 0.07, 0.13, and 0.03, respectively (n=3 each). Significance was assessed by performing Welch’s t-test on the raw data of all samples vs. control. p<0.05 for all PDZ concentrations.CC BY · PubMed Central
Figure 2—figure supplement 1. His-MinC purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinC (27.3 kDa), stained with Coomassie blue stain. From left to right: Ladder, Ni-NTA peak, SEC peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gels from (A) using Penta-His antibody (QIAGEN).
Figure 2—figure supplement 1. His-MinC purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinC (27.3 kDa), stained with Coomassie blue stain. From left to right: Ladder, Ni-NTA peak, SEC peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gels from (A) using Penta-His antibody (QIAGEN).CC BY · PubMed Central
Figure 2—figure supplement 2. His-PDZ purification analysis and rendering of MinJ AlphaFold model. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-PDZ (17.6 kDa), stained with Coomassie blue stain. From left to right: Ladder (L), Ni-NTA main peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN). (C) Rendering of AlphaFold3 model of B. subtilis MinJ (gray) (Abramson et al., 2024). The truncation expressed with pET-28a-PDZ, which includes the PDZ domain (blue), is highlighted in pink.
Figure 2—figure supplement 2. His-PDZ purification analysis and rendering of MinJ AlphaFold model. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-PDZ (17.6 kDa), stained with Coomassie blue stain. From left to right: Ladder (L), Ni-NTA main peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN). (C) Rendering of AlphaFold3 model of B. subtilis MinJ (gray) (Abramson et al., 2024). The truncation expressed with pET-28a-PDZ, which includes the PDZ domain (blue), is highlighted in pink.CC BY · PubMed Central
Figure 3. Cartoon of MinD AlphaFold model with highlighted key amino acids and the effects of their mutagenesis. (A) Left: Rendering of MinD AlphaFold model with ATP binding region highlighted in light blue, membrane targeting sequence (MTS) in turquoise, and key residues in orange. Box: explanation of mutagenesis effects. Right: Close-up on hydrophobic region of amphipathic helix. (B) Representative wide-field microscopy images of B. subtilis expressing indicated Halo-MinD variants as the only MinD copy from the native locus, stained with TMR ligand. Left: phase contrast; scale bar 5 µm. Right: fluorescence.
Figure 3. Cartoon of MinD AlphaFold model with highlighted key amino acids and the effects of their mutagenesis. (A) Left: Rendering of MinD AlphaFold model with ATP binding region highlighted in light blue, membrane targeting sequence (MTS) in turquoise, and key residues in orange. Box: explanation of mutagenesis effects. Right: Close-up on hydrophobic region of amphipathic helix. (B) Representative wide-field microscopy images of B. subtilis expressing indicated Halo-MinD variants as the only MinD copy from the native locus, stained with TMR ligand. Left: phase contrast; scale bar 5 µm. Right: fluorescence.CC BY · PubMed Central
Figure 4. His-MinD mutants are catalytically inactive in ATP hydrolysis assay. (A) Phosphate release plotted against different His-MinD-I260E concentrations and His-MinD as control, fitted with a simple linear regression. Phosphate release was measured using the EnzChek phosphate assay kit. Samples contain 0.2 mg ml–1 liposomes and were pre-incubated for 10 min before the addition of 2 mM Mg2+-ATP. (B) Same as (A) but with different y-axis scaling for better visualization of His-MinD-I260E baseline activity. (C) Same as (B) but comparing His-MinD mutants G12V, K16A, and D40A to His-MinD at 6 µM concentrations, respectively.
Figure 4. His-MinD mutants are catalytically inactive in ATP hydrolysis assay. (A) Phosphate release plotted against different His-MinD-I260E concentrations and His-MinD as control, fitted with a simple linear regression. Phosphate release was measured using the EnzChek phosphate assay kit. Samples contain 0.2 mg ml–1 liposomes and were pre-incubated for 10 min before the addition of 2 mM Mg2+-ATP. (B) Same as (A) but with different y-axis scaling for better visualization of His-MinD-I260E baseline activity. (C) Same as (B) but comparing His-MinD mutants G12V, K16A, and D40A to His-MinD at 6 µM concentrations, respectively.CC BY · PubMed Central
Figure 4—figure supplement 1. His-MinD-I260E purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinD-I260E (31.7 kDa), stained with Coomassie blue stain. From left to right: Ladder, supernatant after lysis, pellet, Ni-NTA flowthrough, Ni-NTA peaks A10 and C4 (main peak), concentrated sample, gel filtration peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN).
Figure 4—figure supplement 1. His-MinD-I260E purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinD-I260E (31.7 kDa), stained with Coomassie blue stain. From left to right: Ladder, supernatant after lysis, pellet, Ni-NTA flowthrough, Ni-NTA peaks A10 and C4 (main peak), concentrated sample, gel filtration peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN).CC BY · PubMed Central
Figure 4—figure supplement 2. His-MinD-G12V purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinD-G12V (31.7 kDa), stained with Coomassie blue stain. From left to right: Ladder, pellet after lysate, supernatant, Ni-NTA flowthrough, Ni-NTA peaks A2, A10, C4 (main peak), concentrated sample, gel filtration peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN).
Figure 4—figure supplement 2. His-MinD-G12V purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinD-G12V (31.7 kDa), stained with Coomassie blue stain. From left to right: Ladder, pellet after lysate, supernatant, Ni-NTA flowthrough, Ni-NTA peaks A2, A10, C4 (main peak), concentrated sample, gel filtration peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN).CC BY · PubMed Central
Figure 4—figure supplement 3. His-MinD-K16A purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinD-K16A (31.7 kDa), stained with Coomassie blue stain. From left to right: Ladder, pellet after lysate, supernatant, Ni-NTA flowthrough, Ni-NTA peaks A2, A10, C4 (main peak), concentrated sample, gel filtration peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN).
Figure 4—figure supplement 3. His-MinD-K16A purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinD-K16A (31.7 kDa), stained with Coomassie blue stain. From left to right: Ladder, pellet after lysate, supernatant, Ni-NTA flowthrough, Ni-NTA peaks A2, A10, C4 (main peak), concentrated sample, gel filtration peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN).CC BY · PubMed Central
Figure 4—figure supplement 4. His-MinD-D40A purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinD-D40A (31.7 kDa), stained with Coomassie blue stain. From left to right: Ladder, supernatant after lysis, pellet, Ni-NTA flowthrough, Ni-NTA peaks A2 and C4 (main peak), concentrated sample, gel filtration peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN).
Figure 4—figure supplement 4. His-MinD-D40A purification analysis. (A) Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) gel analysis of purification products of His-MinD-D40A (31.7 kDa), stained with Coomassie blue stain. From left to right: Ladder, supernatant after lysis, pellet, Ni-NTA flowthrough, Ni-NTA peaks A2 and C4 (main peak), concentrated sample, gel filtration peak. Ladder = Color Prestained Protein Standard, Broad Range (New England Biolabs). (B) Western blot of replicate gel from (A) using Penta-His antibody (QIAGEN).CC BY · PubMed Central
Figure 5. Bio-layer interferometry (BLI) analysis of His-MinD and different mutants. (A) Left: Cartoon representation of the different BLI steps, starting with (1) establishing a baseline in protein buffer, (2) binding of liposomes through the biotinylated DSPE-PEG(2000) phospholipid, (3) establishing a new baseline, (4) binding of MinD, and finally (5) dissociation of MinD. Right: Exemplary graph resulting from sensor readouts of steps (1)–(5). (B) MinD binding plotted against time through association and dissociation phases (steps 4–5) at different protein concentrations, including the His-MinD-I260E mutant. (C–E) Same as (B) using the indicated respective mutants of His-MinD (G12V, K16A, and D40A).
Figure 5. Bio-layer interferometry (BLI) analysis of His-MinD and different mutants. (A) Left: Cartoon representation of the different BLI steps, starting with (1) establishing a baseline in protein buffer, (2) binding of liposomes through the biotinylated DSPE-PEG(2000) phospholipid, (3) establishing a new baseline, (4) binding of MinD, and finally (5) dissociation of MinD. Right: Exemplary graph resulting from sensor readouts of steps (1)–(5). (B) MinD binding plotted against time through association and dissociation phases (steps 4–5) at different protein concentrations, including the His-MinD-I260E mutant. (C–E) Same as (B) using the indicated respective mutants of His-MinD (G12V, K16A, and D40A).CC BY · PubMed Central
Figure 5—figure supplement 1. Bio-layer interferometry (BLI) analysis of interactions between His-MinD and His-MinC or His-PDZ. (A) MinD binding (see Figure 5A) plotted against time through association and dissociation phases (steps 4–5) at different indicated His-MinC concentrations, including His-MinD and His-MinC only controls, all in the presence of freshly added ATP [2 mM]. (B) Same as (A) using the indicated respective concentrations of His-PDZ.
Figure 5—figure supplement 1. Bio-layer interferometry (BLI) analysis of interactions between His-MinD and His-MinC or His-PDZ. (A) MinD binding (see Figure 5A) plotted against time through association and dissociation phases (steps 4–5) at different indicated His-MinC concentrations, including His-MinD and His-MinC only controls, all in the presence of freshly added ATP [2 mM]. (B) Same as (A) using the indicated respective concentrations of His-PDZ.CC BY · PubMed Central
Figure 5—figure supplement 2. Bio-layer interferometry (BLI) analysis of His-MinD without the addition of ATP. His-MinD binding to liposome-associated BLI sensor (see Figure 5), plotted against time through association and dissociation phases at different protein concentrations without the addition of Mg2+-ATP.
Figure 5—figure supplement 2. Bio-layer interferometry (BLI) analysis of His-MinD without the addition of ATP. His-MinD binding to liposome-associated BLI sensor (see Figure 5), plotted against time through association and dissociation phases at different protein concentrations without the addition of Mg2+-ATP.CC BY · PubMed Central
Figure 6. Single-molecule localization microscopy (SMLM) analysis of Halo-MinD and mutants expressed in B. subtilis. Exponentially growing B. subtilis cells expressing Halo-MinD and variants (n≥48 cells, respectively) were stained with TMR ligand and subsequently imaged. Individual protein trajectories were recorded using SMLM and analyzed with Zen Blue (Zeiss), TrackMate, the SMTracker 2.0 software package, and manual scripts in R. Minimum track-length 4 frames of 24 ms, with at least 2596 trajectories per strain. (A) Heatmap representation of intracellular localization of individual molecules of Halo-MinD and variants, respectively, plotted on normalized cells. Brighter colors indicate higher abundance. (B) Barplot of stationary localization analysis (SLA), comparing different track types within the protein population. Tracks were considered static when not leaving a circular area of 97 nm diameter within 5+ frames. Mobile populations were further divided into free and mixed tracks, where mixed tracks displayed a switch between free and confined movement. (C) Plot of the mean-squared displacement of Halo-MinD and variants over time, fitted with a linear fit excluding the last time lag. (D) Bubble plot displaying single-molecule diffusion rates of the indicated MinD fusions. Populations were determined by fitting the probability distributions of the frame-to-frame displacement (jump distance) data of all respective tracks to a three-component model (fast mobile, slow mobile, and confined protein populations). (E) Probability distributions of jump distances of Halo-MinD and variants. Data was fit with a three-component model, indicating confined, slow, and fast tracks.
Figure 6. Single-molecule localization microscopy (SMLM) analysis of Halo-MinD and mutants expressed in B. subtilis. Exponentially growing B. subtilis cells expressing Halo-MinD and variants (n≥48 cells, respectively) were stained with TMR ligand and subsequently imaged. Individual protein trajectories were recorded using SMLM and analyzed with Zen Blue (Zeiss), TrackMate, the SMTracker 2.0 software package, and manual scripts in R. Minimum track-length 4 frames of 24 ms, with at least 2596 trajectories per strain. (A) Heatmap representation of intracellular localization of individual molecules of Halo-MinD and variants, respectively, plotted on normalized cells. Brighter colors indicate higher abundance. (B) Barplot of stationary localization analysis (SLA), comparing different track types within the protein population. Tracks were considered static when not leaving a circular area of 97 nm diameter within 5+ frames. Mobile populations were further divided into free and mixed tracks, where mixed tracks displayed a switch between free and confined movement. (C) Plot of the mean-squared displacement of Halo-MinD and variants over time, fitted with a linear fit excluding the last time lag. (D) Bubble plot displaying single-molecule diffusion rates of the indicated MinD fusions. Populations were determined by fitting the probability distributions of the frame-to-frame displacement (jump distance) data of all respective tracks to a three-component model (fast mobile, slow mobile, and confined protein populations). (E) Probability distributions of jump distances of Halo-MinD and variants. Data was fit with a three-component model, indicating confined, slow, and fast tracks.CC BY · PubMed Central
Figure 7. Single-molecule localization microscopy (SMLM) analysis of Halo-MinD expressed in B. subtilis wild-type and mutant backgrounds. Exponentially growing B. subtilis cells expressing Halo-MinD in the indicated genetic backgrounds (n≥115 cells, respectively) were stained with TMR ligand and subsequently imaged. Individual protein trajectories were recorded using SMLM and analyzed with Zen Blue (Zeiss), TrackMate, the SMTracker 2.0 software package, and manual scripts in R. Minimum track-length 4 frames of 24 ms, with at least 2688 trajectories per strain. (A) Heatmap representation of intracellular localization of individual molecules of Halo-MinD in the indicated genetic background, respectively, plotted on normalized cells. Brighter colors indicate higher abundance. (B) Barplot of stationary localization analysis (SLA), comparing different track types within the protein population. Tracks were considered static when not leaving a circular area of 97 nm diameter within 5+ frames. Mobile populations were further divided into free and mixed tracks, where mixed tracks displayed a switch between free and confined movement. (C) Bubble plot displaying single-molecule diffusion rates of Halo-MinD in different genetic backgrounds. Populations were determined by fitting the probability distributions of the frame-to-frame displacement (jump distance) data of all respective tracks to a three-component model (fast mobile, slow mobile, and confined protein populations). (D) Probability distributions of jump distances of Halo-MinD in different genetic backgrounds. Data was fit with a three-component model, indicating confined, slow, and fast tracks.
Figure 7. Single-molecule localization microscopy (SMLM) analysis of Halo-MinD expressed in B. subtilis wild-type and mutant backgrounds. Exponentially growing B. subtilis cells expressing Halo-MinD in the indicated genetic backgrounds (n≥115 cells, respectively) were stained with TMR ligand and subsequently imaged. Individual protein trajectories were recorded using SMLM and analyzed with Zen Blue (Zeiss), TrackMate, the SMTracker 2.0 software package, and manual scripts in R. Minimum track-length 4 frames of 24 ms, with at least 2688 trajectories per strain. (A) Heatmap representation of intracellular localization of individual molecules of Halo-MinD in the indicated genetic background, respectively, plotted on normalized cells. Brighter colors indicate higher abundance. (B) Barplot of stationary localization analysis (SLA), comparing different track types within the protein population. Tracks were considered static when not leaving a circular area of 97 nm diameter within 5+ frames. Mobile populations were further divided into free and mixed tracks, where mixed tracks displayed a switch between free and confined movement. (C) Bubble plot displaying single-molecule diffusion rates of Halo-MinD in different genetic backgrounds. Populations were determined by fitting the probability distributions of the frame-to-frame displacement (jump distance) data of all respective tracks to a three-component model (fast mobile, slow mobile, and confined protein populations). (D) Probability distributions of jump distances of Halo-MinD in different genetic backgrounds. Data was fit with a three-component model, indicating confined, slow, and fast tracks.CC BY · PubMed Central

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Metadata

Authors
Feddersen, H., Dyckmans, C., & Bramkamp, M.
Affiliations
Christian-Albrechts-Universität zu Kiel (DE)
Corresponding author
Bramkamp, Marc
Venue
eLife
Published
2026-06-08
Volume
13
ISSN
2050-084X (ISSN-L)
OpenAlex
W4402438708
Cited by
0
References
1
Type
posted content
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Deutsche Forschungsgemeinschaft (TRR174,P5)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cell Biology › Microtubule and mitosis dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biophysics › Advanced Fluorescence Microscopy Techniques
Keywords
Min system, mind, MinC, cell division site selection, membrane binding, ATPase activity, ATP binding, protein dimerization, protein diffusion, single-molecule localization microscopy, single-molecule tracking, Bacillus subtilis, cell division
MeSH terms
Single Molecule Imaging, Adenosine Triphosphatases, Adenosine Triphosphate, Bacillus subtilis, Bacterial Proteins, Cell Division, Cell Membrane, Protein Binding, Protein Transport

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