6JPF

Structure of atOSCA1.1 channel at 3.52A


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.52 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation 3D Report Full Report


This is version 1.0 of the entry. See complete history

Re-refinement Note

This entry reflects an alternative modeling of the original data in: 

  • 5YD1 - determined by Chen, L., Zhang, M., Kang, Y., Wu, J.X.  

Literature

Structure of the mechanosensitive OSCA channels.

Zhang, M.Wang, D.Kang, Y.Wu, J.X.Yao, F.Pan, C.Yan, Z.Song, C.Chen, L.

(2018) Nat. Struct. Mol. Biol. 25: 850-858

  • DOI: 10.1038/s41594-018-0117-6
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Mechanosensitive ion channels convert mechanical stimuli into a flow of ions. These channels are widely distributed from bacteria to higher plants and humans, and are involved in many crucial physiological processes. Here we show that two members of ...

    Mechanosensitive ion channels convert mechanical stimuli into a flow of ions. These channels are widely distributed from bacteria to higher plants and humans, and are involved in many crucial physiological processes. Here we show that two members of the OSCA protein family in Arabidopsis thaliana, namely AtOSCA1.1 and AtOSCA3.1, belong to a new class of mechanosensitive ion channels. We solve the structure of the AtOSCA1.1 channel at 3.5-Å resolution and AtOSCA3.1 at 4.8-Å resolution by cryo-electron microscopy. OSCA channels are symmetric dimers that are mediated by cytosolic inter-subunit interactions. Strikingly, they have structural similarity to the mammalian TMEM16 family proteins. Our structural analysis accompanied with electrophysiological studies identifies the ion permeation pathway within each subunit and suggests a conformational change model for activation.


    Organizational Affiliation

    State Key Laboratory of Membrane Biology, Institute of Molecular Medicine, Peking University, Beijing Key Laboratory of Cardiometabolic Molecular Medicine, Beijing, China.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Protein OSCA1
A, B
772Arabidopsis thalianaMutation(s): 0 
Gene Names: OSCA1
Find proteins for Q9XEA1 (Arabidopsis thaliana)
Go to UniProtKB:  Q9XEA1
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.52 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of ChinaChina31622021
National Natural Science Foundation of ChinaChina31521062
Ministry of Science and Technology (China)China2016YFA0502004

Revision History 

  • Version 1.0: 2019-04-10
    Type: Initial release