8WBA

Cryo-EM structure of the ABCG25 bound to CHS


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural insights into AtABCG25, an angiosperm-specific abscisic acid exporter.

Xin, J.Zhou, Y.Qiu, Y.Geng, H.Wang, Y.Song, Y.Liang, J.Yan, K.

(2024) Plant Commun 5: 100776-100776

  • DOI: https://doi.org/10.1016/j.xplc.2023.100776
  • Primary Citation of Related Structures:  
    8WAM, 8WBA, 8WBX, 8WD6

  • PubMed Abstract: 

    Cellular hormone homeostasis is essential for precise spatial and temporal signaling responses and plant fitness. Abscisic acid (ABA) plays pivotal roles in orchestrating various developmental and stress responses and confers fitness benefits over ecological and evolutionary timescales in terrestrial plants. Cellular ABA level is regulated by complex processes, including biosynthesis, catabolism, and transport. AtABCG25 is the first ABA exporter identified through genetic screening and affects diverse ABA responses. Resolving the structural basis of ABA export by ABCG25 is critical for further manipulations of ABA homeostasis and plant fitness. We used cryo-electron microscopy to elucidate the structural dynamics of AtABCG25 and successfully characterized different states, including apo AtABCG25, ABA-bound AtABCG25, and ATP-bound AtABCG25 (E232Q). Notably, AtABCG25 forms a homodimer that features a deep, slit-like cavity in the transmembrane domain, and we precisely characterized the critical residues in the cavity where ABA binds. ATP binding triggers closure of the nucleotide-binding domains and conformational transitions in the transmembrane domains. We show that AtABCG25 belongs to a conserved ABCG subfamily that originated during the evolution of angiosperms. This subfamily neofunctionalized to regulate seed germination via the endosperm, in concert with the evolution of this angiosperm-specific, embryo-nourishing tissue. Collectively, these findings provide valuable insights into the intricate substrate recognition and transport mechanisms of the ABA exporter AtABCG25, paving the way for genetic manipulation of ABA homeostasis and plant fitness.


  • Organizational Affiliation

    Department of Chemical Biology, School of Life Sciences, Southern University of Science and Technology, Shenzhen 518055, China.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
ABC transporter G family member 25
A, B
698Arabidopsis thalianaMutation(s): 0 
Gene Names: ABCG25
Membrane Entity: Yes 
UniProt
Find proteins for Q84TH5 (Arabidopsis thaliana)
Explore Q84TH5 
Go to UniProtKB:  Q84TH5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ84TH5
Sequence Annotations
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Natural Science Foundation of China (NSFC)China32271251

Revision History  (Full details and data files)

  • Version 1.0: 2023-09-27
    Type: Initial release
  • Version 1.1: 2024-04-10
    Changes: Database references