8T56

Structure of mechanically activated ion channel OSCA1.2 in peptidiscs


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure of mechanically activated ion channel OSCA2.3 reveals mobile elements in the transmembrane domain.

Jojoa-Cruz, S.Burendei, B.Lee, W.H.Ward, A.B.

(2024) Structure 32: 157

  • DOI: https://doi.org/10.1016/j.str.2023.11.009
  • Primary Citation of Related Structures:  
    8T56, 8T57

  • PubMed Abstract: 

    Members of the OSCA/TMEM63 family are mechanically activated ion channels and structures of some OSCA members have revealed the architecture of these channels and structural features that are potentially involved in mechanosensation. However, these structures are all in a similar state and information about the motion of different elements of the structure is limited, preventing a deeper understanding of how these channels work. Here, we used cryoelectron microscopy to determine high-resolution structures of Arabidopsis thaliana OSCA1.2 and OSCA2.3 in peptidiscs. The structure of OSCA1.2 matches previous structures of the same protein in different environments. Yet, in OSCA2.3, the TM6a-TM7 linker adopts a different conformation that constricts the pore on its cytoplasmic side. Furthermore, coevolutionary sequence analysis uncovered a conserved interaction between the TM6a-TM7 linker and the beam-like domain (BLD). Our results reveal conformational heterogeneity and differences in conserved interactions between the TMD and BLD among members of the OSCA family.


  • Organizational Affiliation

    Department of Integrative Structural and Computational Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Calcium permeable stress-gated cation channel 1
A, B
781Arabidopsis thalianaMutation(s): 0 
Gene Names: CSC1At4g22120F1N20.220
Membrane Entity: Yes 
UniProt
Find proteins for Q5XEZ5 (Arabidopsis thaliana)
Explore Q5XEZ5 
Go to UniProtKB:  Q5XEZ5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ5XEZ5
Sequence Annotations
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
NSPr peptide
C, D, E, F, G
C, D, E, F, G, H, I, J
37synthetic constructMutation(s): 0 
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
Expand
  • Reference Sequence
Small Molecules
Ligands 4 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
LBN
Query on LBN

Download Ideal Coordinates CCD File 
HA [auth B],
V [auth A]
1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine
C42 H82 N O8 P
WTJKGGKOPKCXLL-VYOBOKEXSA-N
Y01
Query on Y01

Download Ideal Coordinates CCD File 
K [auth A],
W [auth B]
CHOLESTEROL HEMISUCCINATE
C31 H50 O4
WLNARFZDISHUGS-MIXBDBMTSA-N
CLR
Query on CLR

Download Ideal Coordinates CCD File 
IA [auth C]
JA [auth D]
MA [auth E]
OA [auth G]
PA [auth H]
IA [auth C],
JA [auth D],
MA [auth E],
OA [auth G],
PA [auth H],
SA [auth I]
CHOLESTEROL
C27 H46 O
HVYWMOMLDIMFJA-DPAQBDIFSA-N
PLM
Query on PLM

Download Ideal Coordinates CCD File 
AA [auth B]
BA [auth B]
CA [auth B]
DA [auth B]
EA [auth B]
AA [auth B],
BA [auth B],
CA [auth B],
DA [auth B],
EA [auth B],
FA [auth B],
GA [auth B],
KA [auth D],
L [auth A],
LA [auth D],
M [auth A],
N [auth A],
NA [auth E],
O [auth A],
P [auth A],
Q [auth A],
QA [auth H],
R [auth A],
RA [auth H],
S [auth A],
T [auth A],
TA [auth I],
U [auth A],
X [auth B],
Y [auth B],
Z [auth B]
PALMITIC ACID
C16 H32 O2
IPCSVZSSVZVIGE-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.80 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.1
MODEL REFINEMENTCoot0.9
MODEL REFINEMENTPHENIX1.18.2-3874
MODEL REFINEMENTRosetta3.10

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Heart, Lung, and Blood Institute (NIH/NHLBI)United StatesHL143297

Revision History  (Full details and data files)

  • Version 1.0: 2023-12-27
    Type: Initial release
  • Version 1.1: 2024-02-14
    Changes: Database references