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Bacteria use processing body condensates to attenuate host translation during infection
Open accessPreprint — published as 10.1126/sciadv.aec4477
Abstract
Pathogens employ sophisticated strategies to modulate host protein homeostasis by targeting proteolytic pathways, but their impact on protein synthesis remains elusive. We report that pathogenic bacteria Pseudomonas syringae ( Pst ) targets ribonucleoprotein condensates, known as processing bodies (P-bodies), to attenuate host translation through two effectors with liquid-like properties. We uncovered a previously unknown link that Pst -mediated repression of the ER stress response is required for P-body assembly. Furthermore, we identify a novel intersection between P-bodies and autophagy, demonstrating that autophagic clearance of P-bodies is crucial for maintaining the balance between translationally active and inactive mRNAs. Altogether, our discoveries provide novel insights on how host translation is attenuated by bacteria to dampen plant immunity and uncover unknown connections between ER stress responses and autophagy with P-body dynamics.
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![Fig. 1. P. syringae induces P-body formation in an effector-dependent manner. (A to C) Confocal microscopy pictures of A. thaliana leaves expressing P-body markers DCP1-GFP [(A) to (C)] and DCP5-GFP (B) infected with indicated Pst strains or mock at different time points (A) or 24 hours [(B) and (C)]. Accompanying boxplots represent the number of fluorescent foci present per focal plane from at least two independent experiments. Scale bars, 50 μm. Different letters indicate statistical groups determined using one-way analysis of variance (ANOVA) test (P < 0.05). (D) Coimmunoprecipitation of YFP-DCP1, DCP5-GFP, or GFP with HA-tagged HopM1 and YFP-HopN1 or GFP with HA-DCP1 or DCP5 transiently expressed in N. benthamiana. GFP blot was split for visualization purposes. Asterisks indicate HA-tagged HopM1 and DCP5. IP, immunoprecipitation. (E) Confocal microscopy of transiently coexpressed YFP N-terminal fragment (nYFP)–tagged DCP1 and DCP5 with YFP C-terminal fragment (cYFP)–tagged HopM1 and HopN1 in N. benthamiana. Scale bars, 50 μm. (F) Confocal microscopy pictures of transiently coexpressed nYFP-tagged DCP1 and DCP5 with cYFP-tagged HopM1 and HopN1 and RFP-XRN4 in N. benthamiana epidermal cells. White arrows indicate colocalization of YFP and RFP signals. Scale bars, 50 μm. (G) Confocal microscopy pictures of transiently coexpressed YFP-DCP1 with HopM1-RFP or YFP-HopN1 with RFP-DCP5 in N. benthamiana. White arrows indicate colocalization of YFP and RFP signals. Scale bars, 25 μm. (H) Representative confocal microscopy images and time-course plot of the fluorescence signal recovery of HopM1-RFP (left) and YFP-HopN1 (right) foci after photobleaching. Recovery was quantified as the percentage of fluorescence intensity compared to before photobleaching. The data represented are the means, and error bars represent the standard error of the mean (n > 10). Scale bars, 5 μm. (I) Confocal microscopy time frames of HopM1-RFP and YFP-DCP1 foci fusing when transiently expressed in N. benthamiana. Scale bars, 5 μm.](/paper-figures/7ac13bd7c81244ba8209c0fe40016deb/bacteria-use-processing-body-condensates-to-attenuate-host-translation-during-figure-1.jpg)
![Fig. 2. P-bodies promote susceptibility through modulation of the ER stress response. (A) Confocal images of epidermal cells from 4-week-old A. thaliana leaves expressing DCP1-GFP in Col-0 or dcp5-1 24 hours after mesophyll infiltration with P. syringae [Pst, 107 colony-forming units (CFU)/ml] or MgCl2 mock. Boxplots show DCP1-GFP foci per focal plane from ≥2 independent experiments. Scale bar, 50 μm. Letters indicate statistically distinct groups (one-way ANOVA, P < 0.05). (B) Bacterial growth in Col-0 and dcp5-1 leaves 3 days after dipping with Pst (107 CFU/ml). Data from three independent experiments (Student’s t test, P < 0.05). (C) Number of differentially expressed genes (DEGs) reflecting treatment effects (Pst versus mock) and genotype effects (dcp5-1 versus Col-0) 24 hours after infiltration. Colors indicate up- (red) and down-regulated (blue) genes (|log2FC| > 1.5, adjusted P < 0.05). (D and E) Heatmaps showing log2 fold changes (log2FCs) of all DEGs (D) or ER stress–related DEGs (E). (F) Immunoblot analysis of ER stress markers BIP1/2 in leaves 24 hours after mock or Pst infiltration. Rubisco (Ponceau S) serves as loading control. Numbers indicate normalized band intensities. (G) Quantification of DCP1-GFP foci in leaves treated with Pst or mock and either TM or dimethyl sulfoxide (DMSO). TM was applied 24 hours before imaging and Pst 8 hours before imaging. Data from two experiments (two-way ANOVA, P < 0.05). (H) Bacterial growth in Col-0, dcp5-1, bzip17/60, and bzip28/60 plants infiltrated with Pst (104 CFU/ml) and TM or DMSO. Bacteria were quantified 3 days postinfection. Data from four experiments (two-way ANOVA, P < 0.05). (I) Immunoblot analysis of BIP1/2 and PDIL1-1 after infection with wild-type or mutant Pst strains. (J and K) Immunoblot analysis of BIP1/2 and RFP-BZIP28 in N. benthamiana leaves transiently expressing RFP-BZIP28 and infected with Pst or treated with TM. (L) Quantification of RFP-BZIP28 nuclear localization. dy denotes the difference in fluorescence intensity between nuclear and cytoplasmic regions, calculated from line intensity profiles. Error bars indicate SEM. Data from two independent experiments. SF, Stain-Free.](/paper-figures/1d92987f155b4f26ace8eb9a6a752860/bacteria-use-processing-body-condensates-to-attenuate-host-translation-during-figure-2.jpg)


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Metadata
- Authors
- González-Fuente, M., Schulz, N., Abdrakhmanov, A., Izzati, G., Zhu, S., Langin, G., Gouguet, P., Franz-Wachtel, M., Macek, B., Hafrén, A., Dagdas, Y., & Üstün, S.
- Affiliations
- Faculty of Biology and Biotechnology, Ruhr-University Bochum; Bochum, 44780, Germany
- Ruhr University Bochum (DE)
- University of Vienna (AT)
- University of Tübingen (DE)
- Proteome Center Tübingen, Interfaculty Institute for Cell Biology, University of Tübingen; Tübingen, 72076, Germany
- Swedish University of Agricultural Sciences (SE)
- Gregor Mendel Institute of Molecular Plant Biology (AT)
- ORCID
- Venue
- Science Advances
- Publisher
- openRxiv
- Published
- 2025-01-14
- Volume
- 12
- Issue
- 17
- Pages
- eaec4477-eaec4477
- ISSN
- 2375-2548 (ISSN-L)
- PMC
- PMC13108548
- OpenAlex
- W7155491829
- Cited by
- 4
- References
- 1
- Citations by year
- 2026: 1 · 2025: 3
- FWCI
- 3.70
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Science Advances (publishedVersion, cc-by-nc)
- bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion, cc-by-nc-nd)
- PubMed Central (publishedVersion, cc-by-nc)
- PubMed (publishedVersion)
- Funders
- European Commission
- Deutsche Forschungsgemeinschaft (INST 37/965‐1 FUGG, UE188/2‐1, INST 213/1180-1 FUGG, DFG INST 37/819-1 FUGG, GO 3479/1-1)
- University of Toronto
- Université de Strasbourg
- Vetenskapsrådet (2022-03846)
- Boehringer Ingelheim Stiftung
- European Research Council (948996 DIVERSIPHAGY)
- Topics
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Pathogenic Bacteria Studies
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant-Microbe Interactions and Immunity
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
- Keywords
- Pseudomonas syringae, P-bodies, ribonucleoprotein condensates, bacterial effector proteins, endoplasmic reticulum stress response, autophagy, plant immunity, plant-pathogen interaction, mRNA degradation
- MeSH terms
- Biomolecular Condensates, Autophagy, Plant Diseases, Ribonucleoproteins, RNA, Messenger, Protein Biosynthesis, Arabidopsis, Pseudomonas syringae, Host-Pathogen Interactions, Plant Immunity, Endoplasmic Reticulum Stress
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