9JGG | pdb_00009jgg

Solution structure of Murinotoxin-1

• PDB DOI: https://doi.org/10.2210/pdb9JGG/pdb

• Classification: TOXIN
• Organism(s): Pterinochilus murinus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2024-09-07 Released: 2025-09-10 
• Deposition Author(s): Lushpa, V.A., Kuzmenkov, A.I., Deyev, Y.A., Iunusova, V.A., Bocharov, E.V., Vassilevski, A.A.
• Funding Organization(s): Russian Science Foundation

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: target function 

Literature

Spider venom peptides with unique fold selectively block Shaker-type potassium channels.

Kuzmenkov, A.I., Iunusova, V.A., Lushpa, V.A., Deyev, Y.A., Babenko, V.V., Osipov, D.V., Berkut, A.A., Tytgat, J., Bocharov, E.V., Adams, D.J., Finol-Urdaneta, R.K., Vassilevski, A.A.

(2025) Cell Mol Life Sci 82: 300-300

• PubMed: 40778948 
• DOI: https://doi.org/10.1007/s00018-025-05778-7
• Primary Citation Related Structures: 
  9JGG


• PubMed Abstract: 
  

  Natural toxins are highly effective at targeting ion channels with high selectivity and potency. To date, all identified spider venom peptide toxins that modulate voltage-gated potassium (K _V ) channels inhibit Shab (K _V 2) or Shal-related isoforms (K _V 4) by interacting with their voltage-sensing domains. In this study, we report novel spider-derived pore-blocking toxins that selectively target Shaker-type (K _V 1) channels with nanomolar potency. We isolated murinotoxins MnTx-1 and MnTx-2 from the orange baboon tarantula Pterinochilus murinus and sequenced them using a combination of Edman degradation, mass spectrometry, and venom gland nanopore transcriptomics. MnTx-1 was produced recombinantly, and its NMR solution structure was determined. Although MnTx-1 shares sequence motifs common to spider toxins, it displays a distinctly different three-dimensional structure, featuring an alternative disulfide linkage, which we have termed the Disulfide-Reined Hairpin (DRH). We attribute the unique pharmacology of MnTx-1 to its unusual spatial structure. The DRH motif represents a promising new miniature scaffold for future bioengineering applications.

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Organizational Affiliation: 
• Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, 117997, Russia. [e-mail].
Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, 117997, Russia.
Lopukhin Federal Research and Clinical Centre of Physical-Chemical Medicine of Federal Medical Biological Agency, Moscow, 119435, Russia.
Entomology Department, Moscow Zoo, Moscow, 123557, Russia.
Toxicology and Pharmacology, KU Leuven, Leuven, B-3000, Belgium.
Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, NSW 2522, Australia. [e-mail].
Molecular Horizons, University of Wollongong, Wollongong, Australia. [e-mail].
Faculty of Science, Medicine and Health, University of Wollongong, Wollongong, NSW 2522, Australia.
Molecular Horizons, University of Wollongong, Wollongong, Australia.
Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences, Moscow, 117997, Russia. [e-mail].
Moscow Institute of Physics and Technology, National Research University, Dolgoprudny, 141701, Moscow Region, Russia. [e-mail].

Biological Assembly 1  

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors and generated by (software)

Biological Assembly Evidence: NMR Distance Restraints

Macromolecule Content 

• Total Structure Weight: 3.87 kDa 
• Atom Count: 264 
• Modeled Residue Count: 35 
• Deposited Residue Count: 35 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Murinotoxin-1	A	35	Pterinochilus murinus	Mutation(s): 0
UniProt
Find proteins for B1P1B1 (Chilobrachys guangxiensis) Explore B1P1B1  Go to UniProtKB:  B1P1B1

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 100 
• Conformers Submitted: 10 
• Selection Criteria: target function 

Structure Validation

Entry History 

& Funding Information

Deposition Data

• Released Date: 2025-09-10 
Deposition Author(s): Lushpa, V.A., Kuzmenkov, A.I., Deyev, Y.A., Iunusova, V.A., Bocharov, E.V., Vassilevski, A.A.

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Funding Organization	Location	Grant Number
Russian Science Foundation	Russian Federation	22-74-10028

Revision History  

• Version 1.0: 2025-09-10
  Type: Initial release
  
• Version 1.1: 2025-10-29
  Changes: Database references