7BWI

Solution structure of recombinant APETx1


Experimental Data Snapshot

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

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


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

  • 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. We established a method for preparing recombinant APETx1 and determined the NMR structure of the recombinant APETx1, which is structurally equivalent to the natural product. Electrophysiological analyses using wild type and mutants of APETx1 and hERG revealed that their hydrophobic residues, F15, Y32, F33, and L34, in APETx1, and F508 and I521 in hERG, in addition to a previously reported acidic hERG residue, E518, play key roles in the inhibition of hERG by APETx1. Our hypothetical docking models of the APETx1-VSD complex satisfied the results of mutational analysis. The present study identified the key residues of APETx1 and hERG that are involved in hERG inhibition by APETx1. These results would help advance understanding of the inhibitory mechanism of APETx1, which could provide a structural basis for designing novel ligands targeting the VSDs of K V channels.


  • Organizational Affiliation

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


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Kappa-actitoxin-Ael2a42Anthopleura elegantissimaMutation(s): 0 
UniProt
Find proteins for P61541 (Anthopleura elegantissima)
Explore P61541 
Go to UniProtKB:  P61541
Entity Groups  
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UniProt GroupP61541
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

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

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Japan Society for the Promotion of Science (JSPS)JapanJP17H03978

Revision History  (Full details and data files)

  • Version 1.0: 2020-12-23
    Type: Initial release
  • Version 1.1: 2021-07-14
    Changes: Database references
  • Version 1.2: 2024-10-16
    Changes: Data collection, Database references, Structure summary