1LUP

Solution structure of a toxin (GsMTx2) from the tarantula, Grammostola spatulata, which inhibits mechanosensitive ion channels


Experimental Data Snapshot

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

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Solution structure of peptide toxins that block mechanosensitive ion channels

Oswald, R.E.Suchyna, T.M.McFeeters, R.Gottlieb, P.Sachs, F.

(2002) J.Biol.Chem. 277: 34443-34450

  • DOI: 10.1074/jbc.M202715200
  • Primary Citation of Related Structures:  1LQR, 1TYK

  • PubMed Abstract: 
  • Mechanosensitive channels (MSCs) play key roles in sensory processing and have been implicated as primary transducers for a variety of cellular responses ranging from osmosensing to gene expression. This paper presents the first structures of any kin ...

    Mechanosensitive channels (MSCs) play key roles in sensory processing and have been implicated as primary transducers for a variety of cellular responses ranging from osmosensing to gene expression. This paper presents the first structures of any kind known to interact specifically with MSCs. GsMTx-4 and GsMtx-2 are inhibitor cysteine knot peptides isolated from venom of the tarantula, Grammostola spatulata (Suchyna, T. M., Johnson, J. H., Hamer, K., Leykam, J. F., Gage, D. A., Clemo, H. F., Baumgarten, C. M., and Sachs, F. (2000) J. Gen. Physiol. 115, 583-598). Inhibition of cationic MSCs by the higher affinity GsMtx-4 (K(D) approximately 500 nm) reduced cell size in swollen and hypertrophic heart cells, swelling-activated currents in astrocytes, and stretch-induced arrhythmias in the heart. Despite the relatively low affinity, no cross-reactivity has been found with other channels. Using two-dimensional NMR spectroscopy, we determined the solution structure of GsMTx-4 and a lower affinity (GsMTx-2; K(D) approximately 6 microm) peptide from the same venom. The dominant feature of the two structures is a hydrophobic patch, utilizing most of the aromatic residues and surrounded with charged residues. The spatial arrangement of charged residues that are unique to GsMTx-4 and GsMTx-2 may underlie the selectivity of these peptides.


    Related Citations: 
    • Identification of a peptide toxin from Grammostola spatulata spider venom that blocks stretch-activated channels.
      Suchyna, T.M.,Johnson, J.H.,Hamer, K.,Leykam, J.F.,Gage, D.A.,Clemo, H.F.,Baumgarten, C.M.,Sachs, F.
      (2000) J.GEN.PHYSIOL. 115: 583


    Organizational Affiliation

    Department of Molecular Medicine, Cornell University, C3 167 Veterinary Medical Center, Ithaca, NY 14853, USA. reo1@cornell.edu




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
GsMTx2
A
31Grammostola roseaN/A
Find proteins for P60273 (Grammostola rosea)
Go to UniProtKB:  P60273
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 200 
  • Conformers Submitted: 20 
  • Selection Criteria: structures with the least restraint violations, structures with the lowest energy 
  • Olderado: 1LUP Olderado

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-08-07
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance