+Open data
-Basic information
Entry | Database: PDB / ID: 8j1e | |||||||||||||||
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Title | AtSLAC1 in open state | |||||||||||||||
Components | Guard cell S-type anion channel SLAC1,Green fluorescent protein | |||||||||||||||
Keywords | MEMBRANE PROTEIN / Stomatal closure / anion channel / phosphorylation-dependent activation | |||||||||||||||
Function / homology | Function and homology information response to humidity / stomatal closure / regulation of stomatal opening / inorganic anion transport / voltage-gated monoatomic anion channel activity / regulation of stomatal closure / stomatal movement / response to ozone / intracellular monoatomic ion homeostasis / organic anion transport ...response to humidity / stomatal closure / regulation of stomatal opening / inorganic anion transport / voltage-gated monoatomic anion channel activity / regulation of stomatal closure / stomatal movement / response to ozone / intracellular monoatomic ion homeostasis / organic anion transport / monoatomic anion transmembrane transporter activity / response to abscisic acid / response to carbon dioxide / multicellular organismal-level water homeostasis / monoatomic anion transport / abscisic acid-activated signaling pathway / response to light stimulus / bioluminescence / generation of precursor metabolites and energy / protein phosphatase binding / protein kinase binding / membrane / plasma membrane Similarity search - Function | |||||||||||||||
Biological species | Arabidopsis thaliana (thale cress) Aequorea victoria (jellyfish) | |||||||||||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.84 Å | |||||||||||||||
Authors | Lee, Y. / Lee, S. | |||||||||||||||
Funding support | Korea, Republic Of, 4items
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Citation | Journal: Nat Commun / Year: 2023 Title: Cryo-EM structures of the plant anion channel SLAC1 from Arabidopsis thaliana suggest a combined activation model. Authors: Yeongmok Lee / Hyeon Seong Jeong / Seoyeon Jung / Junmo Hwang / Chi Truc Han Le / Sung-Hoon Jun / Eun Jo Du / KyeongJin Kang / Beom-Gi Kim / Hyun-Ho Lim / Sangho Lee / Abstract: The anion channel SLAC1 functions as a crucial effector in the ABA signaling, leading to stomata closure. SLAC1 is activated by phosphorylation in its intracellular domains. Both a binding-activation ...The anion channel SLAC1 functions as a crucial effector in the ABA signaling, leading to stomata closure. SLAC1 is activated by phosphorylation in its intracellular domains. Both a binding-activation model and an inhibition-release model for activation have been proposed based on only the closed structures of SLAC1, rendering the structure-based activation mechanism controversial. Here we report cryo-EM structures of Arabidopsis SLAC1 WT and its phosphomimetic mutants in open and closed states. Comparison of the open structure with the closed ones reveals the structural basis for opening of the conductance pore. Multiple phosphorylation of an intracellular domain (ICD) causes dissociation of ICD from the transmembrane domain. A conserved, positively-charged sequence motif in the intracellular loop 2 (ICL2) seems to be capable of sensing of the negatively charged phosphorylated ICD. Interactions between ICL2 and ICD drive drastic conformational changes, thereby widening the pore. From our results we propose that SLAC1 operates by a mechanism combining the binding-activation and inhibition-release models. | |||||||||||||||
History |
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-Structure visualization
Structure viewer | Molecule: MolmilJmol/JSmol |
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-Downloads & links
-Download
PDBx/mmCIF format | 8j1e.cif.gz | 202.2 KB | Display | PDBx/mmCIF format |
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PDB format | pdb8j1e.ent.gz | 145.6 KB | Display | PDB format |
PDBx/mmJSON format | 8j1e.json.gz | Tree view | PDBx/mmJSON format | |
Others | Other downloads |
-Validation report
Arichive directory | https://data.pdbj.org/pub/pdb/validation_reports/j1/8j1e ftp://data.pdbj.org/pub/pdb/validation_reports/j1/8j1e | HTTPS FTP |
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-Related structure data
Related structure data | 35920MC 8gw6C 8gw7C 8j0jC M: map data used to model this data C: citing same article (ref.) |
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Similar structure data | Similarity search - Function & homologyF&H Search |
-Links
-Assembly
Deposited unit |
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1 |
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-Components
#1: Protein | Mass: 93862.953 Da / Num. of mol.: 3 Mutation: S595R,Y604N,F629L,S630T,Q645R,F664S,N670T,Y710F,M718T,V728A,I736V,A771V Source method: isolated from a genetically manipulated source Source: (gene. exp.) Arabidopsis thaliana (thale cress), (gene. exp.) Aequorea victoria (jellyfish) Gene: SLAC1, CDI3, OZS1, RCD3, At1g12480, F5O11.23, T12C24.3, GFP Plasmid: pACEBac2 / Cell line (production host): Sf9 / Production host: Spodoptera frugiperda (fall armyworm) / References: UniProt: Q9LD83, UniProt: P42212 #2: Chemical | #3: Chemical | ChemComp-CL / Has ligand of interest | N | |
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-Experimental details
-Experiment
Experiment | Method: ELECTRON MICROSCOPY |
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EM experiment | Aggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction |
-Sample preparation
Component | Name: Trimer of open state AtSLAC1 with sfGFP tag in GDN and CHS micelle Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT | ||||||||||||||||||||||||||||||
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Molecular weight | Value: 0.28 MDa / Experimental value: NO | ||||||||||||||||||||||||||||||
Source (natural) | Organism: Arabidopsis thaliana (thale cress) | ||||||||||||||||||||||||||||||
Source (recombinant) | Organism: Spodoptera frugiperda (fall armyworm) / Strain: Sf9 | ||||||||||||||||||||||||||||||
Buffer solution | pH: 7 | ||||||||||||||||||||||||||||||
Buffer component |
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Specimen | Conc.: 1 mg/ml / Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES | ||||||||||||||||||||||||||||||
Specimen support | Grid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R1.2/1.3 | ||||||||||||||||||||||||||||||
Vitrification | Instrument: FEI VITROBOT MARK III / Cryogen name: ETHANE / Humidity: 100 % / Chamber temperature: 277 K |
-Electron microscopy imaging
Microscopy | Model: TFS TALOS |
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Electron gun | Electron source: FIELD EMISSION GUN / Accelerating voltage: 200 kV / Illumination mode: FLOOD BEAM |
Electron lens | Mode: BRIGHT FIELDBright-field microscopy / Nominal defocus max: 1900 nm / Nominal defocus min: 700 nm / Cs: 2.7 mm |
Specimen holder | Cryogen: NITROGEN |
Image recording | Electron dose: 50 e/Å2 / Film or detector model: GATAN K3 BIOQUANTUM (6k x 4k) |
EM imaging optics | Energyfilter name: GIF Bioquantum |
-Processing
Software |
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EM software |
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CTF correction | Type: NONE | ||||||||||||||||
Symmetry | Point symmetry: C3 (3 fold cyclic) | ||||||||||||||||
3D reconstruction | Resolution: 3.84 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 57879 / Algorithm: FOURIER SPACE / Symmetry type: POINT | ||||||||||||||||
Refinement | Cross valid method: NONE |