PDBsum entry 1vnb

Neurotoxin

PDB id: 1vnb

Contents

Protein chain

65 a.a. *

* Residue conservation analysis

PDB id:

1vnb

Name:

Neurotoxin

Title:

Proton nuclear magnetic resonance and distance geometry(slash) simulated annealing studies on the variant-1 neurotoxin from the new world scorpion centruroides sculpturatus ewing

Structure:

Neurotoxin. Chain: a. Engineered: yes

Source:

Centruroides sculpturatus. Bark scorpion. Organism_taxid: 218467

NMR struc:

1 models

Authors:

W.Lee,N.R.Krishna

Key ref:

W.Lee et al. (1994). Proton nuclear magnetic resonance and distance geometry/simulated annealing studies on the variant-1 neurotoxin from the New World scorpion Centruroides sculpturatus Ewing. Biochemistry, 33, 2468-2475. PubMed id: 8117707 DOI: 10.1021/bi00175a015

Date:

26-Oct-93 Release date: 31-Jan-94

Protein chain

P01492  (SCX1_CENSC) -  Toxin CsEv1 from Centruroides sculpturatus

Seq: 87 a.a.

Struc: 65 a.a.*

* PDB and UniProt seqs differ at 1 residue position (black cross)

DOI no: 10.1021/bi00175a015

Biochemistry 33:2468-2475 (1994)

PubMed id: 8117707

Proton nuclear magnetic resonance and distance geometry/simulated annealing studies on the variant-1 neurotoxin from the New World scorpion Centruroides sculpturatus Ewing.

W.Lee, M.J.Jablonsky, D.D.Watt, N.R.Krishna.

ABSTRACT

The sequence-specific proton resonance assignments for the variant-1 (CsE-v1) neurotoxin from the venom of the New World scorpion Centruroides sculpturatus Ewing (range Southwestern United States) have been performed by 2D 1H NMR spectroscopy at 600 MHz. The stereospecific assignments for the beta-methylene protons of 19 non-proline residues have been determined. A number of short-, medium-, and long-range NOESY contacts as well as the backbone and the side-chain vicinal coupling constants for several residues have been determined. Slowly exchanging amide hydrogens from a number of residues have been identified. On the basis of the NMR data, the solution structure of this protein has been determined by a hybrid procedure consisting of distance geometry and dynamical simulated annealing refinement calculations. Distance constraints from the NOESY data and torsion angle constraints from proton vicinal coupling constant data were used in the simulated annealing calculations. The three-dimensional structure of CsE-v1 is characterized by a three-stranded antiparallel beta-sheet, a short alpha-helix, a cis-proline, and intervening loops. A comparison with the solution NMR data of a homologous protein (CsE-v3) from the Centruroides venom, shows that the structures are essentially similar, except for some minor differences. Some of the NMR spectral perturbations are felt in regions far removed from sites of amino acid substitutions. The hydrophobic surface in CsE-v1 is slightly more extended than in CsE-v3.