AtSLAC1 8D mutant in closed state

Experimental Data Snapshot

  • Resolution: 2.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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Cryo-EM structures of the plant anion channel SLAC1 from Arabidopsis thaliana suggest a combined activation model.

Lee, Y.Jeong, H.S.Jung, S.Hwang, J.Le, C.T.H.Jun, S.H.Du, E.J.Kang, K.Kim, B.G.Lim, H.H.Lee, S.

(2023) Nat Commun 14: 7345-7345

  • DOI: https://doi.org/10.1038/s41467-023-43193-3
  • Primary Citation of Related Structures:  
    8GW6, 8GW7, 8J0J, 8J1E

  • PubMed 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 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.

  • Organizational Affiliation

    Department of Biological Sciences, Sungkyunkwan University, Suwon, 16419, Republic of Korea.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Guard cell S-type anion channel SLAC1,Green fluorescent protein
A, B, C
826Arabidopsis thalianaAequorea victoria
This entity is chimeric
Mutation(s): 20 
Gene Names: SLAC1CDI3OZS1RCD3At1g12480F5O11.23T12C24.3GFP
Membrane Entity: Yes 
Find proteins for P42212 (Aequorea victoria)
Explore P42212 
Go to UniProtKB:  P42212
Find proteins for Q9LD83 (Arabidopsis thaliana)
Explore Q9LD83 
Go to UniProtKB:  Q9LD83
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP42212Q9LD83
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 2.70 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
National Research Foundation (NRF, Korea)Korea, Republic Of2022R1A2C100988211
National Research Foundation (NRF, Korea)Korea, Republic Of2021M3A9I4022936
National Research Foundation (NRF, Korea)Korea, Republic Of2020M3A9E4039217
National Research Foundation (NRF, Korea)Korea, Republic Of2017R1A5A1014560

Revision History  (Full details and data files)

  • Version 1.0: 2023-11-22
    Type: Initial release
  • Version 1.1: 2023-11-29
    Changes: Database references