9KG3 | pdb_00009kg3

Alpha-hemolysin heptameric pore state derived from egg PC/Cholesterol (3:1 molar ratio) liposomes


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.07 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural insights into pre-pore intermediates of alpha-hemolysin in the lipidic environment.

Chatterjee, A.Roy, A.Satheesh, T.Das, P.P.Mondal, B.Kishore, P.Ganji, M.Dutta, S.

(2025) Nat Commun 16: 6348-6348

  • DOI: https://doi.org/10.1038/s41467-025-61741-x
  • Primary Citation of Related Structures:  
    9KG0, 9KG1, 9KG3, 9KG6, 9KRE, 9KRF, 9KTM, 9KTO

  • PubMed Abstract: 

    The infectious microbe Staphylococcus aureus releases an array of cytotoxic pore-forming toxins (PFTs) that severely damage the cell membrane during bacterial infection. However, the interaction interfaces between the host cell membrane and toxin were hardly explored. So far, there are no pore, and intermediate structures of these toxins available in the presence of bio-membrane, which could elucidate the pore-forming mechanism. Here, we investigate the structure of different conformational states of this alpha-hemolysin (α-HL/Hla), a β-PFT in lipidic environment using single-particle cryo-EM. Additionally, we explore lipid destabilization by the toxin, using single-molecule imaging, confocal imaging, and validation of lipid-protein interactions using mutational studies. We elucidate eight cryo-EM structures of wildtype α-HL with various liposomes, which are composed of either 10:0 PC or Egg-PC/Cholesterol or Egg-PC/Sphingomyelin or 10:0 PC/Sphingomyelin. Our structural and biophysical studies confirm that different chain lengths and various membrane compositions facilitate the formation of intermediate pre-pores and complete pore species. We also demonstrate that the percentage of pre-pore population increases due to sphingomyelin-induced membrane rigidity. Altogether, this study unveils the structure-function analysis of the pre-pore to pore transition of wildtype α-HL during its crosstalk with the lipid membrane.


  • Organizational Affiliation

    Molecular Biophysics Unit, Indian Institute of Science, Bengaluru, India.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Alpha-hemolysin
A, B, C, D, E
A, B, C, D, E, F, G
293Staphylococcus aureusMutation(s): 0 
Gene Names: hlyhla
UniProt
Find proteins for P09616 (Staphylococcus aureus)
Explore P09616 
Go to UniProtKB:  P09616
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP09616
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.07 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Department of Biotechnology (DBT, India)India--

Revision History  (Full details and data files)

  • Version 1.0: 2025-06-11
    Type: Initial release
  • Version 1.1: 2025-06-25
    Changes: Data collection
  • Version 1.2: 2025-07-23
    Changes: Data collection, Database references