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Dubey SM, Han S, Stutzman N, Prigge MJ, Medvecká E, Platre MP, Busch W, Fendrych M, Estelle M. The AFB1 auxin receptor controls the cytoplasmic auxin response pathway in Arabidopsis thaliana. MOLECULAR PLANT 2023; 16:1120-1130. [PMID: 37391902 PMCID: PMC10720607 DOI: 10.1016/j.molp.2023.06.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Revised: 05/31/2023] [Accepted: 06/26/2023] [Indexed: 07/02/2023]
Abstract
The phytohormone auxin triggers root growth inhibition within seconds via a non-transcriptional pathway. Among members of the TIR1/AFB auxin receptor family, AFB1 has a primary role in this rapid response. However, the unique features that confer this specific function have not been identified. Here we show that the N-terminal region of AFB1, including the F-box domain and residues that contribute to auxin binding, is essential and sufficient for its specific role in the rapid response. Substitution of the N-terminal region of AFB1 with that of TIR1 disrupts its distinct cytoplasm-enriched localization and activity in rapid root growth inhibition by auxin. Importantly, the N-terminal region of AFB1 is indispensable for auxin-triggered calcium influx, which is a prerequisite for rapid root growth inhibition. Furthermore, AFB1 negatively regulates lateral root formation and transcription of auxin-induced genes, suggesting that it plays an inhibitory role in canonical auxin signaling. These results suggest that AFB1 may buffer the transcriptional auxin response, whereas it regulates rapid changes in cell growth that contribute to root gravitropism.
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Affiliation(s)
- Shiv Mani Dubey
- Department of Experimental Plant Biology, Faculty of Sciences, Charles University, Prague, Czech Republic
| | - Soeun Han
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA, USA
| | - Nathan Stutzman
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA, USA
| | - Michael J Prigge
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA, USA
| | - Eva Medvecká
- Department of Experimental Plant Biology, Faculty of Sciences, Charles University, Prague, Czech Republic
| | - Matthieu Pierre Platre
- Plant Molecular and Cellular Biology Laboratory and Integrative Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA, USA
| | - Wolfgang Busch
- Plant Molecular and Cellular Biology Laboratory and Integrative Biology Laboratory, Salk Institute for Biological Studies, La Jolla, CA, USA
| | - Matyáš Fendrych
- Department of Experimental Plant Biology, Faculty of Sciences, Charles University, Prague, Czech Republic.
| | - Mark Estelle
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, CA, USA.
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Dubey SM, Han S, Stutzman N, Prigge MJ, Medvecká E, Platre MP, Busch W, Fendrych M, Estelle M. The AFB1 auxin receptor controls the cytoplasmic auxin response pathway in Arabidopsis thaliana. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.01.04.522696. [PMID: 36711737 PMCID: PMC9881920 DOI: 10.1101/2023.01.04.522696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The phytohormone auxin triggers root growth inhibition within seconds via a non-transcriptional pathway. Among members of the TIR1/AFBs auxin receptor family, AFB1 has a primary role in this rapid response. However, the unique features that confer this specific function have not been identified. Here we show that the N-terminal region of AFB1, including the F-box domain and residues that contribute to auxin binding, are essential and sufficient for its specific role in the rapid response. Substitution of the N-terminal region of AFB1 with that of TIR1 disrupts its distinct cytoplasm-enriched localization and activity in rapid root growth inhibition. Importantly, the N-terminal region of AFB1 is indispensable for auxin-triggered calcium influx which is a prerequisite for rapid root growth inhibition. Furthermore, AFB1 negatively regulates lateral root formation and transcription of auxin-induced genes, suggesting that it plays an inhibitory role in canonical auxin signaling. These results suggest that AFB1 may buffer the transcriptional auxin response while it regulates rapid changes in cell growth that contribute to root gravitropism.
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Affiliation(s)
- Shiv Mani Dubey
- Department of Experimental Plant Biology, Faculty of Sciences, Charles University, Prague, Czech Republic
| | - Soeun Han
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, United States
| | - Nathan Stutzman
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, United States
| | - Michael J Prigge
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, United States
| | - Eva Medvecká
- Department of Experimental Plant Biology, Faculty of Sciences, Charles University, Prague, Czech Republic
| | - Matthieu Pierre Platre
- Plant Molecular and Cellular Biology Laboratory and Integrative Biology Laboratory, Salk Institute for Biological Studies, La Jolla, United States
| | - Wolfgang Busch
- Plant Molecular and Cellular Biology Laboratory and Integrative Biology Laboratory, Salk Institute for Biological Studies, La Jolla, United States
| | - Matyáš Fendrych
- Department of Experimental Plant Biology, Faculty of Sciences, Charles University, Prague, Czech Republic,For correspondence: and
| | - Mark Estelle
- Section of Cell and Developmental Biology, University of California San Diego, La Jolla, United States,For correspondence: and
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3
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Wang Y, Yan X, Xu M, Qi W, Shi C, Li X, Ma J, Tian D, Shou J, Wu H, Pan J, Li B, Wang C. Transmembrane kinase 1-mediated auxin signal regulates membrane-associated clathrin in Arabidopsis roots. JOURNAL OF INTEGRATIVE PLANT BIOLOGY 2023; 65:82-99. [PMID: 36114789 DOI: 10.1111/jipb.13366] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 09/16/2022] [Indexed: 06/15/2023]
Abstract
Clathrin-mediated endocytosis (CME) is the major endocytic pathway in eukaryotic cells that directly regulates abundance of plasma membrane proteins. Clathrin triskelia are composed of clathrin heavy chains (CHCs) and light chains (CLCs), and the phytohormone auxin differentially regulates membrane-associated CLCs and CHCs, modulating the endocytosis and therefore the distribution of auxin efflux transporter PIN-FORMED2 (PIN2). However, the molecular mechanisms by which auxin regulates clathrin are still poorly understood. Transmembrane kinase (TMKs) family proteins are considered to contribute to auxin signaling and plant development; it remains unclear whether they are involved in PIN transport by CME. We assessed TMKs involvement in the regulation of clathrin by auxin, using genetic, pharmacological, and cytological approaches including live-cell imaging and immunofluorescence. In tmk1 mutant seedlings, auxin failed to rapidly regulate abundance of both CHC and CLC and to inhibit PIN2 endocytosis, leading to an impaired asymmetric distribution of PIN2 and therefore auxin. Furthermore, TMK3 and TMK4 were shown not to be involved in regulation of clathrin by auxin. In summary, TMK1 is essential for auxin-regulated clathrin recruitment and CME. TMK1 therefore plays a critical role in the establishment of an asymmetric distribution of PIN2 and an auxin gradient during root gravitropism.
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Affiliation(s)
- Yutong Wang
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Xu Yan
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Mei Xu
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Weiyang Qi
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Chunjie Shi
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Xiaohong Li
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Jiaqi Ma
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Dan Tian
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Jianxin Shou
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Haijun Wu
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Jianwei Pan
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Bo Li
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
| | - Chao Wang
- Ministry of Education Key Laboratory of Cell Activities and Stress Adaptations, School of Life Sciences, Lanzhou University, Lanzhou, 730000, China
- College of Life Sciences, Shaoxing University, Shaoxing, 312000, China
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4
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Pei S, Liu Y, Li W, Krichilsky B, Dai S, Wang Y, Wang X, Johnson DM, Crawford BM, Swift GB, Vo-Dinh T, Pei ZM, Yuan F. OSCA1 is an osmotic specific sensor: a method to distinguish Ca 2+ -mediated osmotic and ionic perception. THE NEW PHYTOLOGIST 2022; 235:1665-1678. [PMID: 35527515 DOI: 10.1111/nph.18217] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 04/29/2022] [Indexed: 06/14/2023]
Abstract
Genetic mutants defective in stimulus-induced Ca2+ increases have been gradually isolated, allowing the identification of cell-surface sensors/receptors, such as the osmosensor OSCA1. However, determining the Ca2+ -signaling specificity to various stimuli in these mutants remains a challenge. For instance, less is known about the exact selectivity between osmotic and ionic stresses in the osca1 mutant. Here, we have developed a method to distinguish the osmotic and ionic effects by analyzing Ca2+ increases, and demonstrated that osca1 is impaired primarily in Ca2+ increases induced by the osmotic but not ionic stress. We recorded Ca2+ increases induced by sorbitol (osmotic effect, OE) and NaCl/CaCl2 (OE + ionic effect, IE) in Arabidopsis wild-type and osca1 seedlings. We assumed the NaCl/CaCl2 total effect (TE) = OE + IE, then developed procedures for Ca2+ imaging, image analysis and mathematic fitting/modeling, and found osca1 defects mainly in OE. The osmotic specificity of osca1 suggests that osmotic and ionic perceptions are independent. The precise estimation of these two stress effects is applicable not only to new Ca2+ -signaling mutants with distinct stimulus specificity but also the complex Ca2+ signaling crosstalk among multiple concurrent stresses that occur naturally, and will enable us to specifically fine tune multiple signal pathways to improve crop yields.
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Affiliation(s)
- Songyu Pei
- College of Life Sciences, Zhejiang University, Hangzhou, 310058, China
- Department of Biology, Duke University, Durham, NC, 27708, USA
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036, China
| | - Yuantao Liu
- College of Life Sciences, Zhejiang University, Hangzhou, 310058, China
- Department of Biology, Duke University, Durham, NC, 27708, USA
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036, China
| | - Wenke Li
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036, China
| | | | - Shiwen Dai
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036, China
| | - Yan Wang
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036, China
| | - Xi Wang
- College of Life Sciences, Zhejiang University, Hangzhou, 310058, China
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036, China
| | | | - Bridget M Crawford
- Fitzpatrick Institute for Photonics, Duke University, Durham, NC, 27708, USA
- Department of Biomedical Engineering, Duke University, Durham, NC, 27708, USA
| | - Gary B Swift
- Department of Physics, Duke University, Durham, NC, 27708, USA
| | - Tuan Vo-Dinh
- Fitzpatrick Institute for Photonics, Duke University, Durham, NC, 27708, USA
- Department of Biomedical Engineering, Duke University, Durham, NC, 27708, USA
| | - Zhen-Ming Pei
- Department of Biology, Duke University, Durham, NC, 27708, USA
- Fitzpatrick Institute for Photonics, Duke University, Durham, NC, 27708, USA
| | - Fang Yuan
- Department of Biology, Duke University, Durham, NC, 27708, USA
- College of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou, 310036, China
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