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(-) Description

Title :  SOLUTION STRUCTURE OF PI4, A FOUR DISULFIDE BRIDGED SCORPION TOXIN ACTIVE ON POTASSIUM CHANNELS
 
Authors :  J. I. Guijarro, S. M'Barek, T. Olamendi-Portugal, F. Gomez-Lagunas, D. Garnier, H. Rochat, L. D. Possani, J. M. Sabatier, M. Delepierre
Date :  21 Nov 02  (Deposition) - 02 Sep 03  (Release) - 24 Feb 09  (Revision)
Method :  SOLUTION NMR
Resolution :  NOT APPLICABLE
Chains :  NMR Structure  :  A  (10x)
Keywords :  Potassium Channel Blocker, Disulfide Bridge Stabilized Alpha Beta Motif, Toxin (Keyword Search: [Gene Ontology, PubMed, Web (Google))
 
Reference :  J. I. Guijarro, S. M'Barek, F. Gomez-Lagunas, D. Garnier, H. Rochat, J. M. Sabatier, L. D. Possani, M. Delepierre
Solution Structure Of Pi4, A Short Four-Disulfide-Bridged Scorpion Toxin Specific Of Potassium Channels.
Protein Sci. V. 12 1844 2003
PubMed-ID: 12930984  |  Reference-DOI: 10.1110/PS.03186703
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - POTASSIUM CHANNEL BLOCKING TOXIN 4
    ChainsA
    EngineeredYES
    Other DetailsTHIS SEQUENCE OCCURS NATURALLY IN THE VENOM OF PANDINUS IMPERATOR SCORPIONS, WITH AN AMIDATED C- TERMINUS. IT WAS ESTABLISHED BY NMR THAT THE STRUCTURE OF THE NATURAL TOXIN EXTRACTED FROM SCORPION VENOM IS EFFECTIVELY IDENTICAL TO THE STRUCTURE OF THE SYNTHETIC TOXIN, WHICH HAS A CARBOXYLATED C-TERMINUS.
    SynonymPI4
    SyntheticYES

 Structural Features

(-) Chains, Units

  
NMR Structure (10x)

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (0, 0)

(no "Ligand,Modified Residues,Ions" information available for 1N8M)

(-) Sites  (0, 0)

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(-) SS Bonds  (4, 4)

NMR Structure
No.Residues
1A:6 -A:27
2A:12 -A:32
3A:16 -A:34
4A:22 -A:37

(-) Cis Peptide Bonds  (0, 0)

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 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

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(-) PROSITE Motifs  (1, 1)

NMR Structure (1, 1)
 PROSITEUniProtKBPDB
No.IDACDescriptionIDLocationCountLocation
1SCORP_SHORT_TOXINPS01138 Scorpion short toxins signature.KAX64_PANIM12-34  1A:12-34

(-) Exons   (0, 0)

(no "Exon" information available for 1N8M)

(-) Sequences/Alignments

NMR Structure
   Reformat: Number of residues per line =  ('0' or empty: single-line sequence representation)
  Number of residues per labelling interval =   
  UniProt sequence: complete  aligned part    
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SAPs(SNPs) PROSITE motifs Exons
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Chain A from PDB  Type:PROTEIN  Length:38
 aligned with KAX64_PANIM | P58498 from UniProtKB/Swiss-Prot  Length:38

    Alignment length:38
                                    10        20        30        
           KAX64_PANIM    1 IEAIRCGGSRDCYRPCQKRTGCPNAKCINKTCKCYGCS 38
               SCOP domains d1n8ma_ A:                             SCOP domains
               CATH domains -------------------------------------- CATH domains
               Pfam domains ---Toxin_2-1n8mA01 A:4-35          --- Pfam domains
         Sec.struct. author ........hhhhhhhhhhhhh...eeee..eeee.... Sec.struct. author
                 SAPs(SNPs) -------------------------------------- SAPs(SNPs)
                    PROSITE -----------SCORP_SHORT_TOXIN      ---- PROSITE
                 Transcript -------------------------------------- Transcript
                  1n8m A  1 IEAIRCGGSRDCYRPCQKRTGCPNAKCINKTCKCYGCS 38
                                    10        20        30        

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 Classification and Annotation

(-) SCOP Domains  (1, 1)

NMR Structure

(-) CATH Domains  (0, 0)

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(-) Pfam Domains  (1, 1)

NMR Structure

(-) Gene Ontology  (4, 4)

NMR Structure(hide GO term definitions)
Chain A   (KAX64_PANIM | P58498)
molecular function
    GO:0008200    ion channel inhibitor activity    Stops, prevents, or reduces the activity of an ion channel.
biological process
    GO:0006952    defense response    Reactions, triggered in response to the presence of a foreign body or the occurrence of an injury, which result in restriction of damage to the organism attacked or prevention/recovery from the infection caused by the attack.
    GO:0009405    pathogenesis    The set of specific processes that generate the ability of an organism to induce an abnormal, generally detrimental state in another organism.
cellular component
    GO:0005576    extracellular region    The space external to the outermost structure of a cell. For cells without external protective or external encapsulating structures this refers to space outside of the plasma membrane. This term covers the host cell environment outside an intracellular parasite.

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