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Paganelli L, Caillaud MC, Quentin M, Damiani I, Govetto B, Lecomte P, Karpov PA, Abad P, Chabouté ME, Favery B. Three BUB1 and BUBR1/MAD3-related spindle assembly checkpoint proteins are required for accurate mitosis in Arabidopsis. New Phytol 2015; 205:202-15. [PMID: 25262777 DOI: 10.1111/nph.13073] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2014] [Accepted: 07/27/2014] [Indexed: 05/13/2023]
Abstract
The spindle assembly checkpoint (SAC) is a refined surveillance mechanism which ensures that chromosomes undergoing mitosis do not segregate until they are properly attached to the spindle microtubules (MT). The SAC has been extensively studied in metazoans and yeast, but little is known about its role in plants. We identified proteins interacting with a MT-associated protein MAP65-3, which plays a critical role in organising mitotic MT arrays, and carried out a functional analysis of previously and newly identified SAC components. We show that Arabidopsis SAC proteins BUB3.1, MAD2, BUBR1/MAD3s and BRK1 interact with each other and with MAP65-3. We found that two BUBR1/MAD3s interacted specifically at centromeres. When stably expressed in Arabidopsis, BRK1 localised to the kinetochores during all stages of the mitotic cell cycle. Early in mitosis, BUB3.1 and BUBR1/MAD3.1 localise to the mitotic spindle, where MAP65-3 organises spindle MTs. A double-knockout mad3.1 mad3.2 mutant presented spindle MT abnormalities, chromosome misalignments on the metaphase plate and the production of lagging chromosomes and micronuclei during mitosis. We conclude that BRK1 and BUBR1/MAD3-related proteins play a key role in ensuring faithful chromosome segregation during mitosis and that their interaction with MAP65-3 may be important for the regulation of MT-chromosome attachment.
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Affiliation(s)
- Laetitia Paganelli
- UMR 1355, Institut Sophia Agrobiotech, INRA, 400 route des Chappes, F-06903, Sophia-Antipolis, France; UMR 7254, CNRS, 400 route des Chappes, F-06903, Sophia-Antipolis, France; UMR 1355, Université de Nice Sophia-Antipolis, 400 route des Chappes, F-06903, Sophia-Antipolis, France
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Larousse M, Govetto B, Séassau A, Etienne C, Industri B, Theodorakopoulos N, Deleury E, Ponchet M, Panabières F, Galiana E. Characterization of PPMUCL1/2/3, three members of a new oomycete-specific mucin-like protein family residing in Phytophthora parasitica biofilm. Protist 2014; 165:275-92. [PMID: 24739437 DOI: 10.1016/j.protis.2014.03.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2013] [Revised: 02/21/2014] [Accepted: 03/10/2014] [Indexed: 11/28/2022]
Abstract
The plant pathogen Phytophthora parasitica forms a biofilm on the host surface. The biofilm transcriptome is characterized by the expression of PPMUCL1/2/3 (PHYTOPHTHORA PARASITICA MUCIN-LIKE) genes, which we report here to be members of a new, large mucin-like gene family restricted to the oomycete lineage. These genes encode secreted proteins organized into two domains. The NH2-terminal domain is highly conserved, but of unknown function. The second domain is a mucin-like domain enriched in threonine and serine residues, with a large number of putative O-glycosylation sites and a repeated motif defining 15 subgroups among the 315 members of the family. The second domain was found to be glycosylated in the recombinant rPPMUCL1 and rPPMUCL2 proteins. An analysis of PPMUCL1/2/3 gene expression indicated that these genes were expressed in a specific and coordinated manner in the biofilm. A novel cis-motif (R) bound to nuclear proteins, suggesting a possible role in PPMUCL1/2/3 gene regulation. Immunohistochemical staining revealed that the PPMUCL1/2 proteins were secreted and accumulated on the surface of the biofilm. Our data demonstrate that PPMUCL1/2/3 belong to a new oomycete-specific family of mucin-like proteins playing a structural role in the biofilm extracellular matrix.
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Affiliation(s)
- Marie Larousse
- INRA, UMR1355 Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France; University Nice Sophia Antipolis, ISA, UMR 1355, 06900 Sophia Antipolis, France; CNRS, UMR 7254, Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France
| | - Benjamin Govetto
- INRA, UMR1355 Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France; University Nice Sophia Antipolis, ISA, UMR 1355, 06900 Sophia Antipolis, France; CNRS, UMR 7254, Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France
| | - Aurélie Séassau
- INRA, UMR1355 Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France; University Nice Sophia Antipolis, ISA, UMR 1355, 06900 Sophia Antipolis, France; CNRS, UMR 7254, Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France
| | - Catherine Etienne
- INRA, UMR1355 Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France; University Nice Sophia Antipolis, ISA, UMR 1355, 06900 Sophia Antipolis, France; CNRS, UMR 7254, Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France
| | - Benoit Industri
- INRA, UMR1355 Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France; University Nice Sophia Antipolis, ISA, UMR 1355, 06900 Sophia Antipolis, France; CNRS, UMR 7254, Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France
| | - Nicolas Theodorakopoulos
- INRA, UMR1355 Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France; University Nice Sophia Antipolis, ISA, UMR 1355, 06900 Sophia Antipolis, France; CNRS, UMR 7254, Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France
| | - Emeline Deleury
- INRA, UMR1355 Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France; University Nice Sophia Antipolis, ISA, UMR 1355, 06900 Sophia Antipolis, France; CNRS, UMR 7254, Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France
| | - Michel Ponchet
- INRA, UMR1355 Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France; University Nice Sophia Antipolis, ISA, UMR 1355, 06900 Sophia Antipolis, France; CNRS, UMR 7254, Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France
| | - Franck Panabières
- INRA, UMR1355 Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France; University Nice Sophia Antipolis, ISA, UMR 1355, 06900 Sophia Antipolis, France; CNRS, UMR 7254, Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France
| | - Eric Galiana
- INRA, UMR1355 Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France; University Nice Sophia Antipolis, ISA, UMR 1355, 06900 Sophia Antipolis, France; CNRS, UMR 7254, Institut Sophia Agrobiotech, F-06903 Sophia Antipolis, France.
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Evangelisti E, Govetto B, Minet-Kebdani N, Kuhn ML, Attard A, Ponchet M, Panabières F, Gourgues M. The Phytophthora parasitica RXLR effector penetration-specific effector 1 favours Arabidopsis thaliana infection by interfering with auxin physiology. New Phytol 2013; 199:476-489. [PMID: 23594295 DOI: 10.1111/nph.12270] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2013] [Accepted: 03/09/2013] [Indexed: 05/20/2023]
Abstract
Pathogenic oomycetes have evolved RXLR effectors to thwart plant defense mechanisms and invade host tissues. We analysed the function of one of these effectors (Penetration-Specific Effector 1 (PSE1)) whose transcript is transiently accumulated during penetration of host roots by the oomycete Phytophthora parasitica. Expression of PSE1 protein in tobacco (Nicotiana tabacum and Nicotiana benthamiana) leaves and in Arabidopsis thaliana plants was used to assess the role of this effector in plant physiology and in interactions with pathogens. A pharmacological approach and marker lines were used to charcterize the A. thaliana phenotypes. Expression of PSE1 in A. thaliana led to developmental perturbations associated with low concentrations of auxin at the root apex. This modification of auxin content was associated with an altered distribution of the PIN4 and PIN7 auxin efflux carriers. The PSE1 protein facilitated plant infection: it suppressed plant cell death activated by Pseudomonas syringae avirulence gene AvrPto and Phytophthora cryptogea elicitin cryptogein in tobacco and exacerbated disease symptoms upon inoculation of transgenic A. thaliana plantlets with P. parasitica in an auxin-dependant manner. We propose that P. parasitica secretes the PSE1 protein during the penetration process to favour the infection by locally modulating the auxin content. These results support the hypothesis that effectors from plant pathogens may act on a limited set of targets, including hormones.
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Affiliation(s)
- Edouard Evangelisti
- UMR Institut Sophia Agrobiotech, INRA 1355 - CNRS 7254 - Université de Nice Sophia Antipolis, 06903, Sophia Antipolis, France
| | - Benjamin Govetto
- UMR Institut Sophia Agrobiotech, INRA 1355 - CNRS 7254 - Université de Nice Sophia Antipolis, 06903, Sophia Antipolis, France
| | - Naïma Minet-Kebdani
- UMR Institut Sophia Agrobiotech, INRA 1355 - CNRS 7254 - Université de Nice Sophia Antipolis, 06903, Sophia Antipolis, France
| | - Marie-Line Kuhn
- UMR Institut Sophia Agrobiotech, INRA 1355 - CNRS 7254 - Université de Nice Sophia Antipolis, 06903, Sophia Antipolis, France
| | - Agnès Attard
- UMR Institut Sophia Agrobiotech, INRA 1355 - CNRS 7254 - Université de Nice Sophia Antipolis, 06903, Sophia Antipolis, France
| | - Michel Ponchet
- UMR Institut Sophia Agrobiotech, INRA 1355 - CNRS 7254 - Université de Nice Sophia Antipolis, 06903, Sophia Antipolis, France
| | - Franck Panabières
- UMR Institut Sophia Agrobiotech, INRA 1355 - CNRS 7254 - Université de Nice Sophia Antipolis, 06903, Sophia Antipolis, France
| | - Mathieu Gourgues
- UMR Institut Sophia Agrobiotech, INRA 1355 - CNRS 7254 - Université de Nice Sophia Antipolis, 06903, Sophia Antipolis, France
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