4
|
Bodrikov V, Pauschert A, Kochlamazashvili G, Stuermer CAO. Reggie-1 and reggie-2 (flotillins) participate in Rab11a-dependent cargo trafficking, spine synapse formation and LTP-related AMPA receptor (GluA1) surface exposure in mouse hippocampal neurons. Exp Neurol 2016; 289:31-45. [PMID: 27993509 DOI: 10.1016/j.expneurol.2016.12.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 12/13/2016] [Accepted: 12/14/2016] [Indexed: 10/20/2022]
Abstract
Reggie-1 and -2 (flotillins) reside at recycling vesicles and promote jointly with Rab11a the targeted delivery of cargo. Recycling is essential for synapse formation suggesting that reggies and Rab11a may regulate the development of spine synapses. Recycling vesicles provide cargo for dendritic growth and recycle surface glutamate receptors (AMPAR, GluA) for long-term potentiation (LTP) induced surface exposure. Here, we show reduced number of spine synapses and impairment of an in vitro correlate of LTP in hippocampal neurons from reggie-1 k.o. (Flot2-/-) mice maturating in culture. These defects apparently result from reduced trafficking of PSD-95 revealed by live imaging of 10 div reggie-1 k.o. (Flot2-/-) neurons and likely impairs co-transport of cargo destined for spines: N-cadherin and the glutamate receptors GluA1 and GluN1. Impaired cargo trafficking and fewer synapses also emerged in reggie-1 siRNA, reggie-2 siRNA, and reggie-1 and -2 siRNA-treated neurons and was in siRNA and k.o. neurons rescued by reggie-1-EGFP and CA-Rab11a-EGFP. While correlative expressional changes of specific synapse proteins were observed in reggie-1 k.o. (Flot2-/-) brains in vivo, this did not occur in neurons maturating in vitro. Our work suggests that reggie-1 and reggie-2 function at Rab11a recycling containers in the transport of PSD-95, N-cadherin, GluA1 and GluN1, and promote (together with significant signaling molecules) spine-directed trafficking, spine synapse formation and the in vitro correlate of LTP.
Collapse
Affiliation(s)
| | - Aline Pauschert
- Dept. Biology, University Konstanz, 78464 Konstanz, Germany.
| | - Gaga Kochlamazashvili
- Leibniz-Institut für Molekulare Pharmakologie, Robert-Roessle-Straße 10, 13125 Berlin, Germany.
| | | |
Collapse
|
5
|
Bruggeman Q, Garmier M, de Bont L, Soubigou-Taconnat L, Mazubert C, Benhamed M, Raynaud C, Bergounioux C, Delarue M. The Polyadenylation Factor Subunit CLEAVAGE AND POLYADENYLATION SPECIFICITY FACTOR30: A Key Factor of Programmed Cell Death and a Regulator of Immunity in Arabidopsis. PLANT PHYSIOLOGY 2014; 165:732-746. [PMID: 24706550 PMCID: PMC4044851 DOI: 10.1104/pp.114.236083] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2014] [Accepted: 04/02/2014] [Indexed: 05/20/2023]
Abstract
Programmed cell death (PCD) is essential for several aspects of plant life, including development and stress responses. Indeed, incompatible plant-pathogen interactions are well known to induce the hypersensitive response, a localized cell death. Mutational analyses have identified several key PCD components, and we recently identified the mips1 mutant of Arabidopsis (Arabidopsis thaliana), which is deficient for the key enzyme catalyzing the limiting step of myoinositol synthesis. One of the most striking features of mips1 is the light-dependent formation of lesions on leaves due to salicylic acid (SA)-dependent PCD, revealing roles for myoinositol or inositol derivatives in the regulation of PCD. Here, we identified a regulator of plant PCD by screening for mutants that display transcriptomic profiles opposing that of the mips1 mutant. Our screen identified the oxt6 mutant, which has been described previously as being tolerant to oxidative stress. In the oxt6 mutant, a transfer DNA is inserted in the CLEAVAGE AND POLYADENYLATION SPECIFICITY FACTOR30 (CPSF30) gene, which encodes a polyadenylation factor subunit homolog. We show that CPSF30 is required for lesion formation in mips1 via SA-dependent signaling, that the prodeath function of CPSF30 is not mediated by changes in the glutathione status, and that CPSF30 activity is required for Pseudomonas syringae resistance. We also show that the oxt6 mutation suppresses cell death in other lesion-mimic mutants, including lesion-simulating disease1, mitogen-activated protein kinase4, constitutive expressor of pathogenesis-related genes5, and catalase2, suggesting that CPSF30 and, thus, the control of messenger RNA 3' end processing, through the regulation of SA production, is a key component of plant immune responses.
Collapse
Affiliation(s)
- Quentin Bruggeman
- Université Paris-Sud, Institut de Biologie des Plantes, Unité Mixte de Recherche Centre National de la Recherche Scientifique 8618, Saclay Plant Sciences, F-91405 Orsay, France (Q.B., M.G., L.d.B., C.M., M.B., C.R., C.B., M.D.);Unité de Recherche en Génomique Végétale-Unité Mixte de Recherche-Institut National de la Recherche Agronomique 1165-Centre National de la Recherche Scientifique 8114, 91 057 Evry cedex, France (L.S.-T.); andDivision of Biological and Environmental Sciences and Engineering and Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, Kingdom of Saudi Arabia (M.B.)
| | - Marie Garmier
- Université Paris-Sud, Institut de Biologie des Plantes, Unité Mixte de Recherche Centre National de la Recherche Scientifique 8618, Saclay Plant Sciences, F-91405 Orsay, France (Q.B., M.G., L.d.B., C.M., M.B., C.R., C.B., M.D.);Unité de Recherche en Génomique Végétale-Unité Mixte de Recherche-Institut National de la Recherche Agronomique 1165-Centre National de la Recherche Scientifique 8114, 91 057 Evry cedex, France (L.S.-T.); andDivision of Biological and Environmental Sciences and Engineering and Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, Kingdom of Saudi Arabia (M.B.)
| | - Linda de Bont
- Université Paris-Sud, Institut de Biologie des Plantes, Unité Mixte de Recherche Centre National de la Recherche Scientifique 8618, Saclay Plant Sciences, F-91405 Orsay, France (Q.B., M.G., L.d.B., C.M., M.B., C.R., C.B., M.D.);Unité de Recherche en Génomique Végétale-Unité Mixte de Recherche-Institut National de la Recherche Agronomique 1165-Centre National de la Recherche Scientifique 8114, 91 057 Evry cedex, France (L.S.-T.); andDivision of Biological and Environmental Sciences and Engineering and Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, Kingdom of Saudi Arabia (M.B.)
| | - Ludivine Soubigou-Taconnat
- Université Paris-Sud, Institut de Biologie des Plantes, Unité Mixte de Recherche Centre National de la Recherche Scientifique 8618, Saclay Plant Sciences, F-91405 Orsay, France (Q.B., M.G., L.d.B., C.M., M.B., C.R., C.B., M.D.);Unité de Recherche en Génomique Végétale-Unité Mixte de Recherche-Institut National de la Recherche Agronomique 1165-Centre National de la Recherche Scientifique 8114, 91 057 Evry cedex, France (L.S.-T.); andDivision of Biological and Environmental Sciences and Engineering and Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, Kingdom of Saudi Arabia (M.B.)
| | - Christelle Mazubert
- Université Paris-Sud, Institut de Biologie des Plantes, Unité Mixte de Recherche Centre National de la Recherche Scientifique 8618, Saclay Plant Sciences, F-91405 Orsay, France (Q.B., M.G., L.d.B., C.M., M.B., C.R., C.B., M.D.);Unité de Recherche en Génomique Végétale-Unité Mixte de Recherche-Institut National de la Recherche Agronomique 1165-Centre National de la Recherche Scientifique 8114, 91 057 Evry cedex, France (L.S.-T.); andDivision of Biological and Environmental Sciences and Engineering and Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, Kingdom of Saudi Arabia (M.B.)
| | - Moussa Benhamed
- Université Paris-Sud, Institut de Biologie des Plantes, Unité Mixte de Recherche Centre National de la Recherche Scientifique 8618, Saclay Plant Sciences, F-91405 Orsay, France (Q.B., M.G., L.d.B., C.M., M.B., C.R., C.B., M.D.);Unité de Recherche en Génomique Végétale-Unité Mixte de Recherche-Institut National de la Recherche Agronomique 1165-Centre National de la Recherche Scientifique 8114, 91 057 Evry cedex, France (L.S.-T.); andDivision of Biological and Environmental Sciences and Engineering and Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, Kingdom of Saudi Arabia (M.B.)
| | - Cécile Raynaud
- Université Paris-Sud, Institut de Biologie des Plantes, Unité Mixte de Recherche Centre National de la Recherche Scientifique 8618, Saclay Plant Sciences, F-91405 Orsay, France (Q.B., M.G., L.d.B., C.M., M.B., C.R., C.B., M.D.);Unité de Recherche en Génomique Végétale-Unité Mixte de Recherche-Institut National de la Recherche Agronomique 1165-Centre National de la Recherche Scientifique 8114, 91 057 Evry cedex, France (L.S.-T.); andDivision of Biological and Environmental Sciences and Engineering and Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, Kingdom of Saudi Arabia (M.B.)
| | - Catherine Bergounioux
- Université Paris-Sud, Institut de Biologie des Plantes, Unité Mixte de Recherche Centre National de la Recherche Scientifique 8618, Saclay Plant Sciences, F-91405 Orsay, France (Q.B., M.G., L.d.B., C.M., M.B., C.R., C.B., M.D.);Unité de Recherche en Génomique Végétale-Unité Mixte de Recherche-Institut National de la Recherche Agronomique 1165-Centre National de la Recherche Scientifique 8114, 91 057 Evry cedex, France (L.S.-T.); andDivision of Biological and Environmental Sciences and Engineering and Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, Kingdom of Saudi Arabia (M.B.)
| | - Marianne Delarue
- Université Paris-Sud, Institut de Biologie des Plantes, Unité Mixte de Recherche Centre National de la Recherche Scientifique 8618, Saclay Plant Sciences, F-91405 Orsay, France (Q.B., M.G., L.d.B., C.M., M.B., C.R., C.B., M.D.);Unité de Recherche en Génomique Végétale-Unité Mixte de Recherche-Institut National de la Recherche Agronomique 1165-Centre National de la Recherche Scientifique 8114, 91 057 Evry cedex, France (L.S.-T.); andDivision of Biological and Environmental Sciences and Engineering and Center for Desert Agriculture, King Abdullah University of Science and Technology, Thuwal, Kingdom of Saudi Arabia (M.B.)
| |
Collapse
|
6
|
Sierecki E, Stevers LM, Giles N, Polinkovsky ME, Moustaqil M, Mureev S, Johnston WA, Dahmer-Heath M, Skalamera D, Gonda TJ, Gabrielli B, Collins BM, Alexandrov K, Gambin Y. Rapid mapping of interactions between Human SNX-BAR proteins measured in vitro by AlphaScreen and single-molecule spectroscopy. Mol Cell Proteomics 2014; 13:2233-45. [PMID: 24866125 DOI: 10.1074/mcp.m113.037275] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Protein dimerization and oligomerization is commonly used by nature to increase the structural and functional complexity of proteins. Regulated protein assembly is essential to transfer information in signaling, transcriptional, and membrane trafficking events. Here we show that a combination of cell-free protein expression, a proximity based interaction assay (AlphaScreen), and single-molecule fluorescence allow rapid mapping of homo- and hetero-oligomerization of proteins. We have applied this approach to the family of BAR domain-containing sorting nexin (SNX-BAR) proteins, which are essential regulators of membrane trafficking and remodeling in all eukaryotes. Dimerization of BAR domains is essential for creating a concave structure capable of sensing and inducing membrane curvature. We have systematically mapped 144 pairwise interactions between the human SNX-BAR proteins and generated an interaction matrix of preferred dimerization partners for each family member. We find that while nine SNX-BAR proteins are able to form homo-dimers, several including the retromer-associated SNX1, SNX2, and SNX5 require heteromeric interactions for dimerization. SNX2, SNX4, SNX6, and SNX8 show a promiscuous ability to bind other SNX-BAR proteins and we also observe a novel interaction with the SNX3 protein which lacks the BAR domain structure.
Collapse
Affiliation(s)
- Emma Sierecki
- From the ‡Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072 Australia
| | - Loes M Stevers
- From the ‡Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072 Australia
| | - Nichole Giles
- From the ‡Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072 Australia
| | - Mark E Polinkovsky
- From the ‡Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072 Australia
| | - Mehdi Moustaqil
- From the ‡Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072 Australia
| | - Sergey Mureev
- From the ‡Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072 Australia
| | - Wayne A Johnston
- From the ‡Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072 Australia
| | - Mareike Dahmer-Heath
- §University of Queensland, Diamantina Institute, Translational Research Institute, Brisbane, Australia
| | - Dubravka Skalamera
- §University of Queensland, Diamantina Institute, Translational Research Institute, Brisbane, Australia
| | - Thomas J Gonda
- ¶School of Pharmacy, The University of Queensland, Brisbane, Australia
| | - Brian Gabrielli
- §University of Queensland, Diamantina Institute, Translational Research Institute, Brisbane, Australia
| | - Brett M Collins
- From the ‡Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072 Australia
| | - Kirill Alexandrov
- From the ‡Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072 Australia;
| | - Yann Gambin
- From the ‡Institute for Molecular Bioscience, The University of Queensland, St. Lucia, QLD 4072 Australia
| |
Collapse
|
8
|
Li X, Garrity AG, Xu H. Regulation of membrane trafficking by signalling on endosomal and lysosomal membranes. J Physiol 2013; 591:4389-401. [PMID: 23878375 DOI: 10.1113/jphysiol.2013.258301] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Endosomal and lysosomal membrane trafficking requires the coordination of multiple signalling events to control cargo sorting and processing, and endosome maturation. The initiation and termination of signalling events in endosomes and lysosomes is not well understood, but several key regulators have been identified, which include small GTPases, phosphoinositides, and Ca2+. Small GTPases act as master regulators and molecular switches in a GTP-dependent manner, initiating signalling cascades to regulate the direction and specificity of endosomal trafficking. Phosphoinositides are membrane-bound lipids that indicate vesicular identities for recruiting specific cytoplasmic proteins to endosomal membranes, thus allowing specificity of membrane fusion, fission, and cargo sorting to occur within and between specific vesicle compartments. In addition, phosphoinositides regulate the function of membrane proteins such as ion channels and transporters in a compartment-specific manner to mediate transport and signalling. Finally, Ca2+, a locally acting second messenger released from intracellular ion channels, may provide precise spatiotemporal regulation of endosomal signalling and trafficking events. Small GTPase signalling can regulate phosphoinositide conversion during endosome maturation, and electrophysiological studies on isolated endosomes have shown that endosomal and lysosomal Ca2+ channels are directly modulated by endosomal lipids. Thus trafficking and maturation of endosomes and lysosomes can be precisely regulated by dynamic changes in GTPases and membrane lipids, as well as Ca2+ signalling. Importantly, impaired phosphoinositide and Ca2+ signalling can cause endosomal and lysosomal trafficking defects at the cellular level, and a spectrum of lysosome storage diseases.
Collapse
Affiliation(s)
- Xinran Li
- H. Xu: University of Michigan, MCDB, 3089 Natural Science Building (Kraus), 830 North University, Ann Arbor, MI 48109, USA.
| | | | | |
Collapse
|
9
|
Solis GP, Hülsbusch N, Radon Y, Katanaev VL, Plattner H, Stuermer CAO. Reggies/flotillins interact with Rab11a and SNX4 at the tubulovesicular recycling compartment and function in transferrin receptor and E-cadherin trafficking. Mol Biol Cell 2013; 24:2689-702. [PMID: 23825023 PMCID: PMC3756921 DOI: 10.1091/mbc.e12-12-0854] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
In this study reggie-1/flotillin-2 is identified as a component of the tubulovesicular sorting and recycling compartment, where it interacts with and controls the activity of Rab11a and SNX4. Evidence is given that reggie-1 expression is necessary for the proper recycling of transferrin receptor and E-cadherin in HeLa and A431 cells, respectively. The lipid raft proteins reggie-1 and -2 (flotillins) are implicated in membrane protein trafficking but exactly how has been elusive. We find that reggie-1 and -2 associate with the Rab11a, SNX4, and EHD1–decorated tubulovesicular recycling compartment in HeLa cells and that reggie-1 directly interacts with Rab11a and SNX4. Short hairpin RNA–mediated down-regulation of reggie-1 (and -2) in HeLa cells reduces association of Rab11a with tubular structures and impairs recycling of the transferrin–transferrin receptor (TfR) complex to the plasma membrane. Overexpression of constitutively active Rab11a rescues TfR recycling in reggie-deficient HeLa cells. Similarly, in a Ca2+ switch assay in reggie-depleted A431 cells, internalized E-cadherin is not efficiently recycled to the plasma membrane upon Ca2+ repletion. E-cadherin recycling is rescued, however, by overexpression of constitutively active Rab11a or SNX4 in reggie-deficient A431 cells. This suggests that the function of reggie-1 in sorting and recycling occurs in association with Rab11a and SNX4. Of interest, impaired recycling in reggie-deficient cells leads to de novo E-cadherin biosynthesis and cell contact reformation, showing that cells have ways to compensate the loss of reggies. Together our results identify reggie-1 as a regulator of the Rab11a/SNX4-controlled sorting and recycling pathway, which is, like reggies, evolutionarily conserved.
Collapse
Affiliation(s)
- Gonzalo P Solis
- Department of Biology, University of Konstanz, 78467 Konstanz, Germany.
| | | | | | | | | | | |
Collapse
|
10
|
Ghai R, Bugarcic A, Liu H, Norwood SJ, Skeldal S, Coulson EJ, Li SSC, Teasdale RD, Collins BM. Structural basis for endosomal trafficking of diverse transmembrane cargos by PX-FERM proteins. Proc Natl Acad Sci U S A 2013; 110:E643-52. [PMID: 23382219 PMCID: PMC3581954 DOI: 10.1073/pnas.1216229110] [Citation(s) in RCA: 100] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Transit of proteins through the endosomal organelle following endocytosis is critical for regulating the homeostasis of cell-surface proteins and controlling signal transduction pathways. However, the mechanisms that control these membrane-transport processes are poorly understood. The Phox-homology (PX) domain-containing proteins sorting nexin (SNX) 17, SNX27, and SNX31 have emerged recently as key regulators of endosomal recycling and bind conserved Asn-Pro-Xaa-Tyr-sorting signals in transmembrane cargos via an atypical band, 4.1/ezrin/radixin/moesin (FERM) domain. Here we present the crystal structure of the SNX17 FERM domain bound to the sorting motif of the P-selectin adhesion protein, revealing both the architecture of the atypical FERM domain and the molecular basis for recognition of these essential sorting sequences. We further show that the PX-FERM proteins share a promiscuous ability to bind a wide array of putative cargo molecules, including receptor tyrosine kinases, and propose a model for their coordinated molecular interactions with membrane, cargo, and regulatory proteins.
Collapse
Affiliation(s)
| | | | - Huadong Liu
- Department of Biochemistry and
- Siebens Drake Medical Research Institute, University of Western Ontario, London, ON, Canada N6A 5C1
| | | | - Sune Skeldal
- Queensland Brain Institute, The University of Queensland, St. Lucia, QLD 4072, Australia; and
| | - Elizabeth J. Coulson
- Queensland Brain Institute, The University of Queensland, St. Lucia, QLD 4072, Australia; and
| | - Shawn Shun-Cheng Li
- Department of Biochemistry and
- Siebens Drake Medical Research Institute, University of Western Ontario, London, ON, Canada N6A 5C1
| | | | | |
Collapse
|