2LO7 image
Entry Detail
PDB ID:
2LO7
Keywords:
Title:
Ts16 NMR solution structure
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2012-01-17
Release Date:
2012-03-14
Method Details:
Experimental Method:
Conformers Calculated:
200
Conformers Submitted:
20
Selection Criteria:
20 structures for lowest energy and no violations
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Toxin Ts16
Chain IDs:A
Chain Length:31
Number of Molecules:1
Biological Source:Tityus serrulatus
Ligand Molecules
Primary Citation
New Tricks of an Old Pattern: STRUCTURAL VERSATILITY OF SCORPION TOXINS WITH COMMON CYSTEINE SPACING.
J.Biol.Chem. 287 12321 12330 (2012)
PMID: 22238341 DOI: 10.1074/jbc.M111.329607

Abstact

Scorpion venoms are a rich source of K(+) channel-blocking peptides. For the most part, they are structurally related small disulfide-rich proteins containing a conserved pattern of six cysteines that is assumed to dictate their common three-dimensional folding. In the conventional pattern, two disulfide bridges connect an α-helical segment to the C-terminal strand of a double- or triple-stranded β-sheet, conforming a cystine-stabilized α/β scaffold (CSα/β). Here we show that two K(+) channel-blocking peptides from Tityus scorpions conserve the cysteine spacing of common scorpion venom peptides but display an unconventional disulfide pattern, accompanied by a complete rearrangement of the secondary structure topology into a CS helix-loop-helix fold. Sequence and structural comparisons of the peptides adopting this novel fold suggest that it would be a new elaboration of the widespread CSα/β scaffold, thus revealing an unexpected structural versatility of these small disulfide-rich proteins. Acknowledgment of such versatility is important to understand how venom structural complexity emerged on a limited number of molecular scaffolds.

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Primary Citation of related structures