1LIR

LQ2 FROM LEIURUS QUINQUESTRIATUS, NMR, 22 STRUCTURES


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 22 
  • Conformers Submitted: 22 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

wwPDB Validation   3D Report Full Report


This is version 2.0 of the entry. See complete history


Literature

Solution structure of potassium channel-inhibiting scorpion toxin Lq2.

Renisio, J.G.Lu, Z.Blanc, E.Jin, W.Lewis, J.H.Bornet, O.Darbon, H.

(1999) Proteins 34: 417-426

  • DOI: 10.1002/(sici)1097-0134(19990301)34:4<417::aid-prot1>3.0.co;2-r
  • Primary Citation of Related Structures:  
    1LIR

  • PubMed Abstract: 
  • Lq2 is a unique scorpion toxin. Acting from the extracellular side, Lq2 blocks the ion conduction pore in not only the voltage- and Ca2+ -activated channels, but also the inward-rectifier K+ channels. This finding argues that the three-dimensional structures of the pores in these K+ channels are similar ...

    Lq2 is a unique scorpion toxin. Acting from the extracellular side, Lq2 blocks the ion conduction pore in not only the voltage- and Ca2+ -activated channels, but also the inward-rectifier K+ channels. This finding argues that the three-dimensional structures of the pores in these K+ channels are similar. However, the amino acid sequences that form the external part of the pore are minimally conserved among the various classes of K+ channels. Because Lq2 can bind to all the three classes of K+ channels, we can use Lq2 as a structural probe to examine how the non-conserved pore-forming sequences are arranged in space to form similar pore structures. In the present study, we determined the three-dimensional structure of Lq2 using nuclear magnetic resonance (NMR) techniques. Lq2 consists of an alpha-helix (residues S10 to L20) and a beta-sheet, connected by an alphabeta3 loop (residues N22 to N24). The beta-sheet has two well-defined anti-parallel strands (residues G26 to M29 and residues K32 to C35), which are connected by a type I' beta-turn centered between residues N30 and K31. The N-terminal segment (residues Z1 to T8) appears to form a quasi-third strand of the beta-sheet.


    Organizational Affiliation

    Architecture et Fonction des Macromolécules Biologiques, Centre National de la Recherche Scientifique, UPR 9039, Marseille, France.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
LQ2A37Leiurus quinquestriatus hebraeusMutation(s): 0 
UniProt
Find proteins for P45628 (Leiurus hebraeus)
Explore P45628 
Go to UniProtKB:  P45628
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA
AL-PEPTIDE LINKINGC5 H7 N O3GLN
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 22 
  • Conformers Submitted: 22 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 
  • OLDERADO: 1LIR Olderado

Structure Validation

View Full Validation Report




Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 1998-06-17
    Type: Initial release
  • Version 1.1: 2008-03-24
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance
  • Version 2.0: 2019-12-25
    Changes: Derived calculations, Other, Polymer sequence