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- PDB-7wsw: Cryo-EM structure of the Potassium channel AKT1 from Arabidopsis ... -
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Open data
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Basic information
Entry | Database: PDB / ID: 7wsw | ||||||
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Title | Cryo-EM structure of the Potassium channel AKT1 from Arabidopsis thaliana | ||||||
![]() | Potassium channel AKT1 | ||||||
![]() | MEMBRANE PROTEIN / Complex / Potassium channel | ||||||
Function / homology | ![]() root hair elongation / regulation of stomatal closure / response to water deprivation / inward rectifier potassium channel activity / monoatomic ion channel complex / potassium ion import across plasma membrane / response to salt stress / potassium ion transport / identical protein binding / plasma membrane Similarity search - Function | ||||||
Biological species | ![]() ![]() | ||||||
Method | ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.4 Å | ||||||
![]() | Yang, G.H. / Lu, Y.M. / Zhang, Y.M. / Jia, Y.T. / Li, X.M. / Lei, J.L. | ||||||
Funding support | 1items
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![]() | ![]() Title: Structural basis for the activity regulation of a potassium channel AKT1 from Arabidopsis. Authors: Yaming Lu / Miao Yu / Yutian Jia / Fan Yang / Yanming Zhang / Xia Xu / Xiaomin Li / Fan Yang / Jianlin Lei / Yi Wang / Guanghui Yang / ![]() Abstract: The voltage-gated potassium channel AKT1 is responsible for primary K uptake in Arabidopsis roots. AKT1 is functionally activated through phosphorylation and negatively regulated by a potassium ...The voltage-gated potassium channel AKT1 is responsible for primary K uptake in Arabidopsis roots. AKT1 is functionally activated through phosphorylation and negatively regulated by a potassium channel α-subunit AtKC1. However, the molecular basis for the modulation mechanism remains unclear. Here we report the structures of AKT1, phosphorylated-AKT1, a constitutively-active variant, and AKT1-AtKC1 complex. AKT1 is assembled in 2-fold symmetry at the cytoplasmic domain. Such organization appears to sterically hinder the reorientation of C-linkers during ion permeation. Phosphorylated-AKT1 adopts an alternate 4-fold symmetric conformation at cytoplasmic domain, which indicates conformational changes associated with symmetry switch during channel activation. To corroborate this finding, we perform structure-guided mutagenesis to disrupt the dimeric interface and identify a constitutively-active variant Asp379Ala mediates K permeation independently of phosphorylation. This variant predominantly adopts a 4-fold symmetric conformation. Furthermore, the AKT1-AtKC1 complex assembles in 2-fold symmetry. Together, our work reveals structural insight into the regulatory mechanism for AKT1. | ||||||
History |
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Structure visualization
Structure viewer | Molecule: ![]() ![]() |
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Downloads & links
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Download
PDBx/mmCIF format | ![]() | 361.3 KB | Display | ![]() |
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PDB format | ![]() | 279 KB | Display | ![]() |
PDBx/mmJSON format | ![]() | Tree view | ![]() | |
Others | ![]() |
-Validation report
Summary document | ![]() | 938.4 KB | Display | ![]() |
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Full document | ![]() | 958.9 KB | Display | |
Data in XML | ![]() | 52.9 KB | Display | |
Data in CIF | ![]() | 78.6 KB | Display | |
Arichive directory | ![]() ![]() | HTTPS FTP |
-Related structure data
Related structure data | ![]() 32769MC ![]() 7fcvC ![]() 7xufC M: map data used to model this data C: citing same article ( |
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Similar structure data | Similarity search - Function & homology ![]() |
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Links
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Assembly
Deposited unit | ![]()
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Components
#1: Protein | Mass: 99413.938 Da / Num. of mol.: 4 Source method: isolated from a genetically manipulated source Source: (gene. exp.) ![]() ![]() ![]() ![]() #2: Chemical | ChemComp-PTY / #3: Chemical | 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 |
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Sample preparation
Component | Name: The Potassium channel AKT1 from Arabidopsis thaliana / Type: COMPLEX / Entity ID: #1 / Source: RECOMBINANT |
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Source (natural) | Organism: ![]() ![]() |
Source (recombinant) | Organism: ![]() ![]() |
Buffer solution | pH: 7.4 |
Specimen | Embedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES |
Vitrification | Cryogen name: ETHANE |
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Electron microscopy imaging
Experimental equipment | ![]() Model: Titan Krios / Image courtesy: FEI Company |
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Microscopy | Model: FEI TITAN KRIOS |
Electron gun | Electron source: ![]() |
Electron lens | Mode: BRIGHT FIELD / Nominal defocus max: 1800 nm / Nominal defocus min: 1500 nm |
Image recording | Electron dose: 1.5625 e/Å2 / Film or detector model: GATAN K2 SUMMIT (4k x 4k) |
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Processing
Software | Name: PHENIX / Version: 1.19.1_4122: / Classification: refinement | ||||||||||||||||||||||||
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CTF correction | Type: NONE | ||||||||||||||||||||||||
3D reconstruction | Resolution: 3.4 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 181714 / Symmetry type: POINT | ||||||||||||||||||||||||
Refinement | Highest resolution: 3.4 Å | ||||||||||||||||||||||||
Refine LS restraints |
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