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Pedenla Bomzan D, Sharma A, Lemos Cruz P, Carqueijeiro I, Bellenger L, Rai A, Thippesh AK, Chinnegowda VS, Parihar D, Ducos E, Courdavault V, Nagegowda DA. ROP GTPases with a geranylgeranylation motif modulate alkaloid biosynthesis in Catharanthus roseus. PLANT PHYSIOLOGY 2024; 195:2213-2233. [PMID: 38466200 DOI: 10.1093/plphys/kiae142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Revised: 01/22/2024] [Accepted: 01/24/2024] [Indexed: 03/12/2024]
Abstract
Rho of Plant (ROP) GTPases function as molecular switches that control signaling processes essential for growth, development, and defense. However, their role in specialized metabolism is poorly understood. Previously, we demonstrated that inhibition of protein geranylgeranyl transferase (PGGT-I) negatively impacts the biosynthesis of monoterpene indole alkaloids (MIA) in Madagascar periwinkle (Catharanthus roseus), indicating the involvement of prenylated proteins in signaling. Here, we show through biochemical, molecular, and in planta approaches that specific geranylgeranylated ROPs modulate C. roseus MIA biosynthesis. Among the six C. roseus ROP GTPases (CrROPs), only CrROP3 and CrROP5, having a C-terminal CSIL motif, were specifically prenylated by PGGT-I. Additionally, their transcripts showed higher expression in most parts than other CrROPs. Protein-protein interaction studies revealed that CrROP3 and CrROP5, but not ΔCrROP3, ΔCrROP5, and CrROP2 lacking the CSIL motif, interacted with CrPGGT-I. Further, CrROP3 and CrROP5 exhibited nuclear localization, whereas CrROP2 was localized to the plasma membrane. In planta functional studies revealed that silencing of CrROP3 and CrROP5 negatively affected MIA biosynthesis, while their overexpression upregulated MIA formation. In contrast, silencing and overexpression of CrROP2 had no effect on MIA biosynthesis. Moreover, overexpression of ΔCrROP3 and ΔCrROP5 mutants devoid of sequence coding for the CSIL motif failed to enhance MIA biosynthesis. These results implicate that CrROP3 and CrROP5 have a positive regulatory role on MIA biosynthesis and thus shed light on how geranylgeranylated ROP GTPases mediate the modulation of specialized metabolism in C. roseus.
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Affiliation(s)
- Dikki Pedenla Bomzan
- Molecular Plant Biology and Biotechnology Lab, CSIR-Central Institute of Medicinal and Aromatic Plants, Research Centre, Bengaluru 560065, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Anuj Sharma
- Molecular Plant Biology and Biotechnology Lab, CSIR-Central Institute of Medicinal and Aromatic Plants, Research Centre, Bengaluru 560065, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Pamela Lemos Cruz
- Biomolécules et Biotechnologies Végétales, BBV, EA2106, Universitéde de Tours, 37200 Tours, France
| | - Ines Carqueijeiro
- Biomolécules et Biotechnologies Végétales, BBV, EA2106, Universitéde de Tours, 37200 Tours, France
| | - Léo Bellenger
- Biomolécules et Biotechnologies Végétales, BBV, EA2106, Universitéde de Tours, 37200 Tours, France
| | - Avanish Rai
- Molecular Plant Biology and Biotechnology Lab, CSIR-Central Institute of Medicinal and Aromatic Plants, Research Centre, Bengaluru 560065, India
| | - Akshay Kumar Thippesh
- Department of Biotechnology and Crop Improvement, College of Horticulture, UHS Bagalkot, Mysuru 571130, India
| | - Venkatesha S Chinnegowda
- Department of Biotechnology and Crop Improvement, College of Horticulture, UHS Bagalkot, Mysuru 571130, India
| | - Durgesh Parihar
- Molecular Plant Biology and Biotechnology Lab, CSIR-Central Institute of Medicinal and Aromatic Plants, Research Centre, Bengaluru 560065, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Eric Ducos
- Biomolécules et Biotechnologies Végétales, BBV, EA2106, Universitéde de Tours, 37200 Tours, France
| | - Vincent Courdavault
- Biomolécules et Biotechnologies Végétales, BBV, EA2106, Universitéde de Tours, 37200 Tours, France
| | - Dinesh A Nagegowda
- Molecular Plant Biology and Biotechnology Lab, CSIR-Central Institute of Medicinal and Aromatic Plants, Research Centre, Bengaluru 560065, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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2
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Xiang X, Zhang S, Li E, Shi XL, Zhi JY, Liang X, Yin GM, Qin Z, Li S, Zhang Y. RHO OF PLANT proteins are essential for pollen germination in Arabidopsis. PLANT PHYSIOLOGY 2023; 193:140-155. [PMID: 36974907 DOI: 10.1093/plphys/kiad196] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 02/21/2023] [Accepted: 03/06/2023] [Indexed: 06/18/2023]
Abstract
Pollen germination is a process of polarity establishment, through which a single and unique growth axis is established. Although most of the intracellular activities associated with pollen germination are controlled by RHO OF PLANTs (ROPs) and increased ROP activation accompanies pollen germination, a critical role of ROPs in this process has not yet been demonstrated. Here, by genomic editing of all 4 Arabidopsis (Arabidopsis thaliana) ROPs that are preferentially expressed in pollen, we showed that ROPs are essential for polarity establishment during pollen germination. We further identified and characterized 2 ROP effectors in pollen germination (REGs) through genome-wide interactor screening, boundary of ROP domain (BDR) members BDR8 and BDR9, whose functional loss also resulted in no pollen germination. BDR8 and BDR9 were distributed in the cytosol and the vegetative nucleus of mature pollen grains but redistributed to the plasma membrane (PM) of the germination site and to the apical PM of growing pollen tubes. We demonstrated that the PM redistribution of BDR8 and BDR9 during pollen germination relies on ROPs but not vice versa. Furthermore, enhanced expression of BDR8 partially restored germination of rop1 pollen but had no effects on that of the quadruple rop pollen, supporting their genetic epistasis. Results presented here demonstrate an ROP signaling route essential for pollen germination, which supports evolutionarily conserved roles of Rho GTPases in polarity establishment.
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Affiliation(s)
- Xiaojiao Xiang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Shuzhan Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - En Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Xue-Lian Shi
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Jing-Yu Zhi
- Department of Plant Biology and Ecology, College of Life Sciences, Nankai University, Tian'jin 300071, China
| | - Xin Liang
- Department of Plant Biology and Ecology, College of Life Sciences, Nankai University, Tian'jin 300071, China
| | - Gui-Min Yin
- Department of Plant Biology and Ecology, College of Life Sciences, Nankai University, Tian'jin 300071, China
| | - Zheng Qin
- Department of Plant Biology and Ecology, College of Life Sciences, Nankai University, Tian'jin 300071, China
| | - Sha Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Yan Zhang
- Department of Plant Biology and Ecology, College of Life Sciences, Nankai University, Tian'jin 300071, China
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3
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Sugi N, Izumi R, Tomomi S, Susaki D, Kinoshita T, Maruyama D. Removal of the endoplasma membrane upon sperm cell activation after pollen tube discharge. FRONTIERS IN PLANT SCIENCE 2023; 14:1116289. [PMID: 36778680 PMCID: PMC9909283 DOI: 10.3389/fpls.2023.1116289] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 01/17/2023] [Indexed: 06/18/2023]
Abstract
In pollen and pollen tubes, immotile sperm cells are enclosed by an inner vegetative plasma membrane (IVPM), a single endomembrane originating from the vegetative-cell plasma membrane. It is widely believed that sperm cells must be removed from the IVPM prior to gamete associations and fusions; however, details of the timing and morphological changes upon IVPM dissociation remain elusive. Here, we report a rapid IVPM breakdown immediately before double fertilization in Arabidopsis thaliana. The IVPM was stably observed in coiling pollen tubes when pollen tube discharge was prevented using lorelei mutant ovules. In contrast, a semi-in vivo fertilization assay in wild-type ovules demonstrated fragmented IVPM around sperm nuclei 1 min after pollen tube discharge. These observations revealed the dynamic alteration of released sperm cells and provided new insights into double fertilization in flowering plants. With a summary of recent findings on IVPM lipid composition, we discussed the possible physiological signals controlling IVPM breakdown.
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4
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Li E, Zhang YL, Qin Z, Xu M, Qiao Q, Li S, Li SW, Zhang Y. Signaling network controlling ROP-mediated tip growth in Arabidopsis and beyond. PLANT COMMUNICATIONS 2023; 4:100451. [PMID: 36114666 PMCID: PMC9860187 DOI: 10.1016/j.xplc.2022.100451] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Revised: 08/24/2022] [Accepted: 09/12/2022] [Indexed: 06/15/2023]
Abstract
Cell polarity operates across a broad range of spatial and temporal scales and is essential for specific biological functions of polarized cells. Tip growth is a special type of polarization in which a single and unique polarization site is established and maintained, as for the growth of root hairs and pollen tubes in plants. Extensive studies in past decades have demonstrated that the spatiotemporal localization and activity of Rho of Plants (ROPs), the only class of Rho GTPases in plants, are critical for tip growth. ROPs are switched on or off by different factors to initiate dynamic intracellular activities, leading to tip growth. Recent studies have also uncovered several feedback modules for ROP signaling. In this review, we summarize recent progress on ROP signaling in tip growth, focusing on molecular mechanisms that underlie the dynamic distribution and activity of ROPs in Arabidopsis. We also highlight feedback modules that control ROP-mediated tip growth and provide a perspective for building a complex ROP signaling network. Finally, we provide an evolutionary perspective for ROP-mediated tip growth in Physcomitrella patens and during plant-rhizobia interaction.
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Affiliation(s)
- En Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China.
| | - Yu-Ling Zhang
- College of Life Sciences, Nankai University, Tianjin 300071, China
| | - Zheng Qin
- College of Life Sciences, Nankai University, Tianjin 300071, China
| | - Meng Xu
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Qian Qiao
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Sha Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Shan-Wei Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China
| | - Yan Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an, Shandong 271018, China.
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Gilles LM, Calhau ARM, La Padula V, Jacquier NMA, Lionnet C, Martinant JP, Rogowsky PM, Widiez T. Lipid anchoring and electrostatic interactions target NOT-LIKE-DAD to pollen endo-plasma membrane. J Cell Biol 2021; 220:212519. [PMID: 34323919 PMCID: PMC8327379 DOI: 10.1083/jcb.202010077] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 06/04/2021] [Accepted: 07/08/2021] [Indexed: 01/16/2023] Open
Abstract
Phospholipases cleave phospholipids, major membrane constituents. They are thus essential for many developmental processes, including male gamete development. In flowering plants, mutation of phospholipase NOT-LIKE-DAD (NLD, also known as MTL or ZmPLA1) leads to peculiar defects in sexual reproduction, notably the induction of maternal haploid embryos. Contrary to previous reports, NLD does not localize to cytosol and plasma membrane of sperm cells but to the pollen endo-plasma membrane (endo-PM), a specific membrane derived from the PM of the pollen vegetative cell that encircles the two sperm cells. After pollen tube burst, NLD localizes at the apical region of the egg apparatus. Pharmacological approaches coupled with targeted mutagenesis revealed that lipid anchoring together with electrostatic interactions are involved in the attachment of NLD to this atypical endo-PM. Membrane surface-charge and lipid biosensors indicated that phosphatidylinositol-4,5-bisphosphate is enriched in the endo-PM, uncovering a unique example of how membrane electrostatic properties can define a specific polar domain (i.e., endo-PM), which is critical for plant reproduction and gamete formation.
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Affiliation(s)
- Laurine M Gilles
- Laboratoire Reproduction et Développement des Plantes, Univ Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRAE, F-69342, Lyon, France.,Limagrain, Limagrain Field Seeds, Research Centre, Gerzat, France
| | - Andrea R M Calhau
- Laboratoire Reproduction et Développement des Plantes, Univ Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRAE, F-69342, Lyon, France
| | - Veronica La Padula
- Centre Technologique des Microstructures, Université de Lyon 1, Lyon, France
| | - Nathanaël M A Jacquier
- Laboratoire Reproduction et Développement des Plantes, Univ Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRAE, F-69342, Lyon, France.,Limagrain, Limagrain Field Seeds, Research Centre, Gerzat, France
| | - Claire Lionnet
- Laboratoire Reproduction et Développement des Plantes, Univ Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRAE, F-69342, Lyon, France
| | | | - Peter M Rogowsky
- Laboratoire Reproduction et Développement des Plantes, Univ Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRAE, F-69342, Lyon, France
| | - Thomas Widiez
- Laboratoire Reproduction et Développement des Plantes, Univ Lyon, ENS de Lyon, UCB Lyon 1, CNRS, INRAE, F-69342, Lyon, France
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6
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Motomura K, Takeuchi H, Notaguchi M, Tsuchi H, Takeda A, Kinoshita T, Higashiyama T, Maruyama D. Persistent directional growth capability in Arabidopsis thaliana pollen tubes after nuclear elimination from the apex. Nat Commun 2021; 12:2331. [PMID: 33888710 PMCID: PMC8062503 DOI: 10.1038/s41467-021-22661-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Accepted: 03/22/2021] [Indexed: 02/04/2023] Open
Abstract
During the double fertilization process, pollen tubes deliver two sperm cells to an ovule containing the female gametes. In the pollen tube, the vegetative nucleus and sperm cells move together to the apical region where the vegetative nucleus is thought to play a crucial role in controlling the direction and growth of the pollen tube. Here, we report the generation of pollen tubes in Arabidopsis thaliana whose vegetative nucleus and sperm cells are isolated and sealed by callose plugs in the basal region due to apical transport defects induced by mutations in the WPP domain-interacting tail-anchored proteins (WITs) and sperm cell-specific expression of a dominant mutant of the CALLOSE SYNTHASE 3 protein. Through pollen-tube guidance assays, we show that the physiologically anuclear mutant pollen tubes maintain the ability to grow and enter ovules. Our findings provide insight into the sperm cell delivery mechanism and illustrate the independence of the tip-localized vegetative nucleus from directional growth control of the pollen tube.
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Affiliation(s)
- Kazuki Motomura
- Ritsumeikan Global Innovation Research Organization, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Japan.,Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601, Japan.,JST, PRESTO, Kawaguchi, Saitama, 332-0012, Japan
| | - Hidenori Takeuchi
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601, Japan.,Institute for Advanced Research, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601, Japan
| | - Michitaka Notaguchi
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601, Japan.,Bioscience and Biotechnology Center, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601, Japan
| | - Haruna Tsuchi
- Kihara Institute for Biological Research, Yokohama City University, Maioka-cho, Totsuka-ku, Yokohama, Kanagawa, 244-0813, Japan
| | - Atsushi Takeda
- Ritsumeikan Global Innovation Research Organization, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Japan.,College of Life Sciences, Ritsumeikan University, Kusatsu, Shiga, 525-8577, Japan
| | - Tetsu Kinoshita
- Kihara Institute for Biological Research, Yokohama City University, Maioka-cho, Totsuka-ku, Yokohama, Kanagawa, 244-0813, Japan
| | - Tetsuya Higashiyama
- Institute of Transformative Bio-Molecules (WPI-ITbM), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8601, Japan.,Division of Biological Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8602, Japan.,Department of Biological Sciences, Graduate School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Daisuke Maruyama
- Kihara Institute for Biological Research, Yokohama City University, Maioka-cho, Totsuka-ku, Yokohama, Kanagawa, 244-0813, Japan.
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7
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Li E, Zhang YL, Shi X, Li H, Yuan X, Li S, Zhang Y. A positive feedback circuit for ROP-mediated polar growth. MOLECULAR PLANT 2021; 14:395-410. [PMID: 33271334 DOI: 10.1016/j.molp.2020.11.017] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 09/12/2020] [Accepted: 11/25/2020] [Indexed: 06/12/2023]
Abstract
Tip growth is a special type of polarized growth in which a single and unique polarization site is established and maintained. Rho of Plants (ROP) proteins, which represent the only class of Rho GTPases in plants, regulate tip growth. The dynamic and asymmetric distribution of ROPs is critical for the establishment and maintenance of tip growth, and requires at least one positive feedback loop, which is still elusive. Here, we report a positive feedback circuit essential for tip growth of root hairs, in which ROPs, ROP activators and effectors, and AGC1.5 subfamily kinases are interconnected by sequential oligomerization and phosphorylation. AGC1.5 subfamily kinases interact with and phosphorylate two guanine nucleotide exchange factors (GEFs) of ROPs, RopGEF4 and RopGEF10. They also interact with two ROP effectors, ICR2/RIP3 and MIDD1/RIP4, which bridge active ROPs with AGC1.5. Functional loss of the AGC1.5 subfamily kinases or ICR2 and MIDD1 compromised root hair growth due to reduced ROP signaling. We found that asymmetric targeting of RopGEF4 and RopGEF10 is controlled by AGC1.5-dependent phosphorylation. Interestingly, we discovered that the ROP effectors recruit AGC1.5 to active ROP domains at the plasma membrane during root hair growth and are critical for AGC1.5-dependent phosphorylation of RopGEFs. Given the large number of AGC kinases in plants, this positive feedback circuit may be a universal theme for plant cell polar growth.
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Affiliation(s)
- En Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Yu-Ling Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Xuelian Shi
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Han Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Xuefeng Yuan
- Shandong Province Key Laboratory of Agricultural Microbiology, College of Plant Protection, Shandong Agricultural University, Tai'an 271018, China
| | - Sha Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China.
| | - Yan Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China.
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8
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Elliott L, Moore I, Kirchhelle C. Spatio-temporal control of post-Golgi exocytic trafficking in plants. J Cell Sci 2020; 133:133/4/jcs237065. [PMID: 32102937 DOI: 10.1242/jcs.237065] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
A complex and dynamic endomembrane system is a hallmark of eukaryotic cells and underpins the evolution of specialised cell types in multicellular organisms. Endomembrane system function critically depends on the ability of the cell to (1) define compartment and pathway identity, and (2) organise compartments and pathways dynamically in space and time. Eukaryotes possess a complex molecular machinery to control these processes, including small GTPases and their regulators, SNAREs, tethering factors, motor proteins, and cytoskeletal elements. Whereas many of the core components of the eukaryotic endomembrane system are broadly conserved, there have been substantial diversifications within different lineages, possibly reflecting lineage-specific requirements of endomembrane trafficking. This Review focusses on the spatio-temporal regulation of post-Golgi exocytic transport in plants. It highlights recent advances in our understanding of the elaborate network of pathways transporting different cargoes to different domains of the cell surface, and the molecular machinery underpinning them (with a focus on Rab GTPases, their interactors and the cytoskeleton). We primarily focus on transport in the context of growth, but also highlight how these pathways are co-opted during plant immunity responses and at the plant-pathogen interface.
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Affiliation(s)
- Liam Elliott
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK
| | - Ian Moore
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK
| | - Charlotte Kirchhelle
- Department of Plant Sciences, University of Oxford, South Parks Road, Oxford OX1 3RB, UK
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9
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Li E, Cui Y, Ge FR, Chai S, Zhang WT, Feng QN, Jiang L, Li S, Zhang Y. AGC1.5 Kinase Phosphorylates RopGEFs to Control Pollen Tube Growth. MOLECULAR PLANT 2018; 11:1198-1209. [PMID: 30055264 DOI: 10.1016/j.molp.2018.07.004] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 07/19/2018] [Accepted: 07/19/2018] [Indexed: 05/22/2023]
Abstract
Double fertilization in angiosperms requires the targeted delivery of immotile sperm to the eggs through pollen tubes. The polarity of tip-growing pollen tubes is maintained through dynamic association of active Rho GTPases of plants (ROP-GTP) with the apical plasma membrane. Guanine nucleotide exchange factors for ROPs (RopGEFs) catalyze the activation of ROPs and thereby affect spatiotemporal ROP signaling. Whereas RopGEFs have been found to be phosphorylated proteins, the kinases responsible for their phosphorylation in vivo and biological consequences of RopGEF phosphorylation in pollen tube growth remain unclear. We report here that the Arabidopsis AGC1.5 subfamily of cytoplasmic kinases is critical for the restricted localization of ROP-GTP during pollen tube growth. Loss of AGC1.5 and AGC1.7 functions resulted in the mistargeting of active ROPs and defective events downstream of ROP signaling in pollen tubes. AGC1.5 interacts with RopGEFs via their catalytic PRONE domain and phosphorylates RopGEFs at a conserved Ser residue of PRONE domain. Loss of AGC1.5 and AGC1.7 functions resulted in the mistargeting of RopGEFs in pollen tubes, similar to the phenotype caused by the mutation that renders RopGEFs non-phosphorylatable by AGC1.5. Collectively, our results provide mechanistic insights into the spatiotemporal activation of ROPs during the polar growth of pollen tubes.
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Affiliation(s)
- En Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Yong Cui
- School of Life Sciences, Centre for Cell and Developmental Biology and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Fu-Rong Ge
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Sen Chai
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Wei-Tong Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Qiang-Nan Feng
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China
| | - Liwen Jiang
- School of Life Sciences, Centre for Cell and Developmental Biology and State Key Laboratory of Agrobiotechnology, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Sha Li
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China.
| | - Yan Zhang
- State Key Laboratory of Crop Biology, College of Life Sciences, Shandong Agricultural University, Tai'an 271018, China.
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10
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Wudick MM, Portes MT, Michard E, Rosas-Santiago P, Lizzio MA, Nunes CO, Campos C, Santa Cruz Damineli D, Carvalho JC, Lima PT, Pantoja O, Feijó JA. CORNICHON sorting and regulation of GLR channels underlie pollen tube Ca 2+ homeostasis. Science 2018; 360:533-536. [PMID: 29724955 DOI: 10.1126/science.aar6464] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2017] [Accepted: 03/14/2018] [Indexed: 12/31/2022]
Abstract
Compared to animals, evolution of plant calcium (Ca2+) physiology has led to a loss of proteins for influx and small ligand-operated control of cytosolic Ca2+, leaving many Ca2+ mechanisms unaccounted for. Here, we show a mechanism for sorting and activation of glutamate receptor-like channels (GLRs) by CORNICHON HOMOLOG (CNIH) proteins. Single mutants of pollen-expressed Arabidopsis thaliana GLRs (AtGLRs) showed growth and Ca2+ flux phenotypes expected for plasma membrane Ca2+ channels. However, higher-order mutants of AtGLR3.3 revealed phenotypes contradicting this assumption. These discrepancies could be explained by subcellular AtGLR localization, and we explored the implication of AtCNIHs in this sorting. We found that AtGLRs interact with AtCNIH pairs, yielding specific intracellular localizations. AtCNIHs further trigger AtGLR activity in mammalian cells without any ligand. These results reveal a regulatory mechanism underlying Ca2+ homeostasis by sorting and activation of AtGLRs by AtCNIHs.
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Affiliation(s)
- Michael M Wudick
- University of Maryland Department of Cell Biology and Molecular Genetics, 0118 Bioscience Research Building, 4066 Campus Drive, College Park, MD 20742-5815, USA.,Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, Oeiras, 2780-156, Portugal
| | - Maria Teresa Portes
- University of Maryland Department of Cell Biology and Molecular Genetics, 0118 Bioscience Research Building, 4066 Campus Drive, College Park, MD 20742-5815, USA.,Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, Oeiras, 2780-156, Portugal
| | - Erwan Michard
- University of Maryland Department of Cell Biology and Molecular Genetics, 0118 Bioscience Research Building, 4066 Campus Drive, College Park, MD 20742-5815, USA.,Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, Oeiras, 2780-156, Portugal
| | - Paul Rosas-Santiago
- Instituto de Biotecnología, Universidad Nacional de Autónoma de México, Cuernavaca, Morelos 62250, México
| | - Michael A Lizzio
- University of Maryland Department of Cell Biology and Molecular Genetics, 0118 Bioscience Research Building, 4066 Campus Drive, College Park, MD 20742-5815, USA
| | - Custódio Oliveira Nunes
- University of Maryland Department of Cell Biology and Molecular Genetics, 0118 Bioscience Research Building, 4066 Campus Drive, College Park, MD 20742-5815, USA.,Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, Oeiras, 2780-156, Portugal
| | - Cláudia Campos
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, Oeiras, 2780-156, Portugal
| | - Daniel Santa Cruz Damineli
- University of Maryland Department of Cell Biology and Molecular Genetics, 0118 Bioscience Research Building, 4066 Campus Drive, College Park, MD 20742-5815, USA
| | - Joana C Carvalho
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, Oeiras, 2780-156, Portugal
| | - Pedro T Lima
- Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, Oeiras, 2780-156, Portugal
| | - Omar Pantoja
- Instituto de Biotecnología, Universidad Nacional de Autónoma de México, Cuernavaca, Morelos 62250, México
| | - José A Feijó
- University of Maryland Department of Cell Biology and Molecular Genetics, 0118 Bioscience Research Building, 4066 Campus Drive, College Park, MD 20742-5815, USA. .,Instituto Gulbenkian de Ciência, Rua da Quinta Grande 6, Oeiras, 2780-156, Portugal
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Yalovsky S. Protein lipid modifications and the regulation of ROP GTPase function. JOURNAL OF EXPERIMENTAL BOTANY 2015; 66:1617-24. [PMID: 25711710 DOI: 10.1093/jxb/erv057] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In eukaryotes, the RHO superfamily of small G-proteins is implicated in the regulation of cell polarity and growth. Rho of Plants (ROPs)/RACs are plant-specific Rho family proteins that have been shown to regulate cell polarity, auxin transport and responses, ABA signalling, and response to pathogens. A hallmark of ROP/RAC function is their localization in specific plasma membrane domains. This short review focuses on the mechanisms responsible for membrane interactions of ROPs/RACs and how they affect ROP/RAC function.
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Affiliation(s)
- Shaul Yalovsky
- Department of Molecular Biology and Ecology of Plants, Tel Aviv University, Tel Aviv 69978, Israel
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Cheung AY, Palanivelu R, Tang WH, Xue HW, Yang WC. Pollen and plant reproduction biology: blooming from East to West. MOLECULAR PLANT 2013; 6:995-7. [PMID: 23873927 DOI: 10.1093/mp/sst108] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Affiliation(s)
- Alice Y Cheung
- Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, MA, USA
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