Macromolecule Content

• Total Structure Weight: 4350.02 
• Atom Count: 298 
• Residue Count: 37 
• Unique protein chains: 1

1LIR

LQ2 FROM LEIURUS QUINQUESTRIATUS, NMR, 22 STRUCTURES

• DOI: 10.2210/pdb1LIR/pdb

• Classification: NEUROTOXIN
• Organism(s): Leiurus hebraeus
• Expression System: Escherichia coli BL21


• Deposited: 1998-04-02 Released: 1998-06-17 
• Deposition Author(s): Renisio, J.G., Lu, Z., Blanc, E., Jin, W., Lewis, J.H., Bornet, O., Darbon, H.

---

Experimental Data Snapshot

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

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

• PubMed: 10081954 


• 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. 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: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
LQ2	A	37	Leiurus hebraeus	Mutation(s): 0
Find proteins for P45628 (Leiurus hebraeus) Go to UniProtKB:  P45628

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
PCA	A	L-PEPTIDE LINKING	C5 H7 N O3		GLN

Experimental Data & Validation

Experimental Data

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

Software Package:

Software Name	Purpose
X-PLOR	refinement
X-PLOR	model building
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-04-02 
• Released Date: 1998-06-17 
• Deposition Author(s): Renisio, J.G., Lu, Z., Blanc, E., Jin, W., Lewis, J.H., Bornet, O., Darbon, H.

Revision History 

• Version 1.0: 1998-06-17
  Type: Initial release
• Version 1.1: 2008-03-24
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance