1LSI

LSIII (NMR, 23 STRUCTURES)


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Submitted: 23 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Solution structure of LSIII, a long neurotoxin from the venom of Laticauda semifasciata.

Connolly, P.J.Stern, A.S.Hoch, J.C.

(1996) Biochemistry 35: 418-426

  • DOI: 10.1021/bi9520287

  • PubMed Abstract: 
  • We report the sequence-specific proton assignments and solution structure of the long neurotoxin LSIII from the venom of Laticauda semifasciata determined by two- and three-dimensional 1H NMR. Input for structure calculations consisted of 497 NOE-der ...

    We report the sequence-specific proton assignments and solution structure of the long neurotoxin LSIII from the venom of Laticauda semifasciata determined by two- and three-dimensional 1H NMR. Input for structure calculations consisted of 497 NOE-derived distance restraints and 45 dihedral angle restraints obtained from J couplings. A two-particle-per-residue representation of protein structure was used to generate 200 initial structures which were then subjected to all-atom refinement by simulated annealing. Twenty-three final structures consistent with the experimental restraints were obtained; the average atomic RMS difference between the individual structures and the mean structure was 0.82 A for the backbone heavy atoms and 1.3 A for all heavy atoms (residues 1-26, 37-60). The main elements of regular secondary structure are a three-stranded antiparallel beta-sheet and three finger-like loops protruding from a globular core, consistent with previously reported structures of long neurotoxins. The end of the prominent loop II, which is involved in binding to acetylcholine receptor, is disordered relative to the rest of the molecule. A novel finding of this study is that the loop has a well defined local structure; this and other observations suggest this region moves as a rigid body. We propose that this motion is a heretofore unrecognized general feature of long neurotoxins, with specific consequences for binding to the acetylcholine receptor.


    Related Citations: 
    • Estimating Protein Fold from Incomplete and Approximate NMR Data
      Connolly, P.J.,Stern, A.S.,Hoch, J.C.
      (1994) J.Am.Chem.Soc. 116: 2675


    Organizational Affiliation

    Rowland Institute for Science, Cambridge, Massachusetts 02142, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
LSIII
A
66Laticauda semifasciataMutation(s): 0 
Find proteins for P01379 (Laticauda semifasciata)
Go to UniProtKB:  P01379
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Submitted: 23 
  • Olderado: 1LSI Olderado
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORrefinement
X-PLORphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1996-03-15
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance