2KSL

Structure of the insecticidal toxin TaITX-1


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 25 
  • Selection Criteria: BEST MOLPROBITY SCORE 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Weaponization of a Hormone: Convergent Recruitment of Hyperglycemic Hormone into the Venom of Arthropod Predators

Undheim, E.A.Grimm, L.L.Low, C.F.Morgenstern, D.Herzig, V.Zobel-Thropp, P.Pineda, S.S.Habib, R.Dziemborowicz, S.Fry, B.G.Nicholson, G.M.Binford, G.J.Mobli, M.King, G.F.

(2015) Structure --: --

  • DOI: 10.1016/j.str.2015.05.003
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Arthropod venoms consist primarily of peptide toxins that are injected into their prey with devastating consequences. Venom proteins are thought to be recruited from endogenous body proteins and mutated to yield neofunctionalized toxins with remarkab ...

    Arthropod venoms consist primarily of peptide toxins that are injected into their prey with devastating consequences. Venom proteins are thought to be recruited from endogenous body proteins and mutated to yield neofunctionalized toxins with remarkable affinity for specific subtypes of ion channels and receptors. However, the evolutionary history of venom peptides remains poorly understood. Here we show that a neuropeptide hormone has been convergently recruited into the venom of spiders and centipedes and evolved into a highly stable toxin through divergent modification of the ancestral gene. High-resolution structures of representative hormone-derived toxins revealed they possess a unique structure and disulfide framework and that the key structural adaptation in weaponization of the ancestral hormone was loss of a C-terminal α helix, an adaptation that occurred independently in spiders and centipedes. Our results raise a new paradigm for toxin evolution and highlight the value of structural information in providing insight into protein evolution.


    Organizational Affiliation

    Institute for Molecular Bioscience, The University of Queensland, St Lucia, QLD 4072, Australia; Centre for Advanced Imaging, The University of Queensland, St Lucia, QLD 4072, Australia.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
U1-agatoxin-Ta1a
A
51Eratigena agrestisMutation(s): 0 
Find proteins for O46166 (Eratigena agrestis)
Go to UniProtKB:  O46166
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 25 
  • Selection Criteria: BEST MOLPROBITY SCORE 
  • Olderado: 2KSL Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2010-01-07 
  • Released Date: 2011-01-19 
  • Deposition Author(s): Mobli, M., King, G.F.

Revision History 

  • Version 1.0: 2011-01-19
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2012-10-03
    Type: Structure summary
  • Version 1.3: 2015-06-24
    Type: Database references