7BWI

Solution structure of recombinant APETx1

• PDB DOI:  https://doi.org/10.2210/pdb7BWI/pdb
• BMRB: 36345

• Classification: TOXIN
• Organism(s): Anthopleura elegantissima
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2020-04-14 Released: 2020-12-23 
• Deposition Author(s): Matsumura, K., Kobayashi, N., Kurita, J., Nishimura, Y., Yokogawa, M., Imai, S., Shimada, I., Osawa, M.
• Funding Organization(s): Japan Society for the Promotion of Science (JSPS)

---

Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: target function 

Literature

Mechanism of hERG inhibition by gating-modifier toxin, APETx1, deduced by functional characterization.

Matsumura, K., Shimomura, T., Kubo, Y., Oka, T., Kobayashi, N., Imai, S., Yanase, N., Akimoto, M., Fukuda, M., Yokogawa, M., Ikeda, K., Kurita, J.I., Nishimura, Y., Shimada, I., Osawa, M.

(2021) BMC Mol Cell Biol 22: 3-3

• PubMed: 33413079 
• DOI: https://doi.org/10.1186/s12860-020-00337-3
• Primary Citation of Related Structures:  
  7BWI


• PubMed Abstract: 
  

Human ether-à-go-go-related gene potassium channel 1 (hERG) is a voltage-gated potassium channel, the voltage-sensing domain (VSD) of which is targeted by a gating-modifier toxin, APETx1. APETx1 is a 42-residue peptide toxin of sea anemone Anthopleura elegantissima and inhibits hERG by stabilizing the resting state. A previous study that conducted cysteine-scanning analysis of hERG identified two residues in the S3-S4 region of the VSD that play important roles in hERG inhibition by APETx1. However, mutational analysis of APETx1 could not be conducted as only natural resources have been available until now. Therefore, it remains unclear where and how APETx1 interacts with the VSD in the resting state.

---

Organizational Affiliation: 

Graduate School of Pharmaceutical Sciences, Keio University, Shibakoen, Minato-ku, Tokyo, 105-8512, Japan. [e-mail].

Biological Assembly 1  

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 4.56 kDa 
• Atom Count: 317 
• Modelled Residue Count: 42 
• Deposited Residue Count: 42 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Kappa-actitoxin-Ael2a	A	42	Anthopleura elegantissima	Mutation(s): 0
UniProt
Find proteins for P61541 (Anthopleura elegantissima) Explore P61541  Go to UniProtKB:  P61541

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: target function 

Structure Validation

Entry History & Funding Information

Deposition Data

• Released Date: 2020-12-23 
Deposition Author(s): Matsumura, K., Kobayashi, N., Kurita, J., Nishimura, Y., Yokogawa, M., Imai, S., Shimada, I., Osawa, M.

---

Funding Organization	Location	Grant Number
Japan Society for the Promotion of Science (JSPS)	Japan	JP17H03978

Revision History  

• Version 1.0: 2020-12-23
  Type: Initial release
  
• Version 1.1: 2021-07-14
  Changes: Database references