Biological Assembly 1  

 3D View: Structure | 1D-3D View | Validation Report

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 3.41 kDa 
• Atom Count: 233 
• Modelled Residue Count: 31 
• Deposited Residue Count: 31 
• Unique protein chains: 1

6VNZ

NMR solution structure of tamapin, mutant K20A

• PDB DOI: 10.2210/pdb6VNZ/pdb
• BMRB: 30719

• Classification: TOXIN
• Organism(s): Mesobuthus tamulus
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2020-01-29 Released: 2020-07-29 
• Deposition Author(s): del Rio Portilla, F., Melchor Meneses, C.M., Mayorga Flores, M.
• Funding Organization(s): Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (PAPIIT)

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 

Literature

Novel Blocker of Onco SK3 Channels Derived from Scorpion Toxin Tamapin and Active against Migration of Cancer Cells.

Mayorga-Flores, M., Chantome, A., Melchor-Meneses, C.M., Domingo, I., Titaux-Delgado, G.A., Galindo-Murillo, R., Vandier, C., Del Rio-Portilla, F.

(2020) ACS Med Chem Lett 11: 1627-1633

• PubMed: 32832033 
• DOI: 10.1021/acsmedchemlett.0c00300
• Primary Citation of Related Structures:  
  6VNZ


• PubMed Abstract: 
  

Peptide-based therapy against cancer is a field of great interest for biomedical developments. Since it was shown that SK3 channels promote cancer cell migration and metastatic development, we started using these channels as targets for the development of antimetastatic drugs. Particularly, tamapin (a peptide found in the venom of the scorpion Mesobuthus tamulus ) is the most specific toxin against the SK2 channel currently known. Considering this fact, we designed diverse tamapin mutants based on three different hypotheses to discover a new potent molecule to block SK3 channels. We performed in vitro studies to evaluate this new toxin derivative inhibitor of cancer cell migration. Our results can be used to generate a new tamapin-based therapy against cancer cells that express SK3 channels.

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Organizational Affiliation: 

Departamento de Química de Biomacromoléculas, Instituto de Química, Universidad Nacional Autónoma de México, Circuito Exterior s/n, Ciudad Universitaria, 04510 Ciudad de México, Mexico.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Potassium channel toxin alpha-KTx 5.4	A	31	Mesobuthus tamulus	Mutation(s): 1
UniProt
Find proteins for P59869 (Hottentotta tamulus) Explore P59869  Go to UniProtKB:  P59869

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 200 
• Conformers Submitted: 20 
• Selection Criteria: structures with the lowest energy 
• OLDERADO: 6VNZ Olderado

Structure Validation

Entry History & Funding Information

Deposition Data

• Deposited Date: 2020-01-29 
• Released Date: 2020-07-29 
Deposition Author(s): del Rio Portilla, F., Melchor Meneses, C.M., Mayorga Flores, M.

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Funding Organization	Location	Grant Number
Programa de Apoyo a Proyectos de Investigacion e Innovacion Tecnologica (PAPIIT)	Mexico	207516

Revision History  

• Version 1.0: 2020-07-29
  Type: Initial release
  
• Version 1.1: 2020-08-19
  Changes: Source and taxonomy
• Version 1.2: 2020-09-09
  Changes: Database references