1cn2

From Proteopedia

(Difference between revisions)

Revision as of 07:30, 10 October 2019

SOLUTION STRUCTURE OF TOXIN 2 FROM CENTRUROIDES NOXIUS HOFFMANN, A BETA SCORPION NEUROTOXIN ACTING ON SODIUM CHANNELS, NMR, 15 STRUCTURES

Structural highlights

1cn2 is a 1 chain structure with sequence from Centruroides noxius. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
NonStd Res:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[SCX2_CENNO] Mammal beta-toxins bind voltage-independently at site-4 of sodium channels and shift the activation voltage to more negative potentials. This toxin is active against mammals.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

We have determined the solution structure of Cn2, a beta-toxin extracted from the venom of the New World scorpion Centruroides noxius Hoffmann. Cn2 belongs to the family of scorpion toxins that affect the sodium channel activity, and is very toxic to mammals (LD50=0.4 microg/20 g mouse mass). The three-dimensional structure was determined using 1H-1H two-dimensional NMR spectroscopy, torsion angle dynamics, and restrained energy minimization. The final set of 15 structures was calculated from 876 experimental distance constraints and 58 angle constraints. The structures have a global r. m.s.d. of 1.38 A for backbone atoms and 2.21 A for all heavy atoms. The overall fold is similar to that found in the other scorpion toxins acting on sodium channels. It is made of a triple-stranded antiparallel beta-sheet and an alpha-helix, and is stabilized by four disulfide bridges. A cis-proline residue at position 59 induces a kink of the polypeptide chain in the C-terminal region. The hydrophobic core of the protein is made up of residues L5, V6, L51, A55, and by the eight cysteine residues. A hydrophobic patch is defined by the aromatic residues Y4, Y40, Y42, W47 and by V57 on the side of the beta-sheet facing the solvent. A positively charged patch is formed by K8 and K63 on one edge of the molecule in the C-terminal region. Another positively charged spot is represented by the highly exposed K35. The structure of Cn2 is compared with those of other scorpion toxins acting on sodium channels, in particular Aah II and CsE-v3. This is the first structural report of an anti-mammal beta-scorpion toxin and it provides the necessary information for the design of recombinant mutants that can be used to probe structure-function relationships in scorpion toxins affecting sodium channel activity.

Solution structure of toxin 2 from centruroides noxius Hoffmann, a beta-scorpion neurotoxin acting on sodium channels.,Pintar A, Possani LD, Delepierre M J Mol Biol. 1999 Mar 26;287(2):359-67. PMID:10080898^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Pintar A, Possani LD, Delepierre M. Solution structure of toxin 2 from centruroides noxius Hoffmann, a beta-scorpion neurotoxin acting on sodium channels. J Mol Biol. 1999 Mar 26;287(2):359-67. PMID:10080898 doi:10.1006/jmbi.1999.2611

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1cn2"

@@ Line 1: / Line 1: @@
 ==SOLUTION STRUCTURE OF TOXIN 2 FROM CENTRUROIDES NOXIUS HOFFMANN, A BETA SCORPION NEUROTOXIN ACTING ON SODIUM CHANNELS, NMR, 15 STRUCTURES==
-<StructureSection load='1cn2' size='340' side='right' caption='[[1cn2]], [[NMR_Ensembles_of_Models | 15 NMR models]]' scene=''>
+<StructureSection load='1cn2' size='340' side='right'caption='[[1cn2]], [[NMR_Ensembles_of_Models | 15 NMR models]]' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1cn2]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Centruroides_noxius Centruroides noxius]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1CN2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1CN2 FirstGlance]. <br>
@@ Line 13: / Line 13: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/cn/1cn2_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/cn/1cn2_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
@@ Line 33: / Line 33: @@
 </StructureSection>
 [[Category: Centruroides noxius]]
+[[Category: Large Structures]]
 [[Category: Delepierre, M]]
 [[Category: Pintar, A]]

1cn2

From Proteopedia

Revision as of 07:30, 10 October 2019

SOLUTION STRUCTURE OF TOXIN 2 FROM CENTRUROIDES NOXIUS HOFFMANN, A BETA SCORPION NEUROTOXIN ACTING ON SODIUM CHANNELS, NMR, 15 STRUCTURES

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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