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(-) Description

Title :  CRYSTAL STRUCTURE OF A TOXIN CHIMERA BETWEEN LQH-ALPHA-IT FROM THE SCORPION LEIURUS QUINQUESTRIATUS HEBRAEUS AND AAH2 FROM ANDROCTONUS AUSTRALIS HECTOR
 
Authors :  I. Karbat, F. Frolow, O. Froy, N. Gilles, L. Cohen, M. Turkov, D. Gordon, M. Gurevitz
Date :  17 Feb 04  (Deposition) - 31 Aug 04  (Release) - 30 Apr 14  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  1.30
Chains :  Asym./Biol. Unit :  A
Keywords :  Toxin, Chimera, Scorpion (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )
 
Reference :  I. Karbat, F. Frolow, O. Froy, N. Gilles, L. Cohen, M. Turkov, D. Gordon M. Gurevitz
Molecular Basis Of The High Insecticidal Potency Of Scorpio Alpha-Toxins.
J. Biol. Chem. V. 279 31679 2004
PubMed-ID: 15133045  |  Reference-DOI: 10.1074/JBC.M402048200

(-) Compounds

Molecule 1
    Chains: A
    Engineered: YES
    Expression System: ESCHERICHIA COLI BL21
    Expression System Plasmid: PET-11
    Expression System Strain: BL21
    Expression System Taxid: 511693
    Expression System Vector Type: PLASMID
    Mutation: YES
    Organism Scientific: ANDROCTONUS AUSTRALIS HECTOR
    Organism Taxid: 70175
    Strain: HECTOR
    Synonym: AAH II, AAHII, AAH2

 Structural Features

(-) Chains, Units

  1
Asymmetric/Biological Unit : A

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (3, 4)

Asymmetric/Biological Unit (3, 4)
No.NameCountTypeFull Name
1NO32Ligand/IonNITRATE ION
2PPI1Ligand/IonPROPANOIC ACID
3SO41Ligand/IonSULFATE ION

(-) Sites  (4, 4)

Asymmetric Unit (4, 4)
No.NameEvidenceResiduesDescription
1AC1SOFTWARETHR A:13 , ASN A:19 , TYR A:42 , ARG A:58 , CYS A:63 , HOH A:176 , HOH A:179 , HOH A:191BINDING SITE FOR RESIDUE SO4 A 165
2AC2SOFTWAREGLY A:61 , LYS A:62 , HIS A:64 , HOH A:197BINDING SITE FOR RESIDUE NO3 A 166
3AC3SOFTWARELYS A:8 , THR A:13 , PHE A:15 , HOH A:178 , HOH A:201BINDING SITE FOR RESIDUE NO3 A 167
4AC4SOFTWAREPHE A:17 , ARG A:18 , TYR A:21 , HOH A:246 , HOH A:271BINDING SITE FOR RESIDUE PPI A 168

(-) SS Bonds  (4, 4)

Asymmetric/Biological Unit
No.Residues
1A:12 -A:63
2A:16 -A:36
3A:22 -A:46
4A:26 -A:48

(-) Cis Peptide Bonds  (1, 1)

Asymmetric/Biological Unit
No.Residues
1Asn A:9 -Tyr A:10

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 1SEG)

(-) PROSITE Motifs  (0, 0)

(no "PROSITE Motif" information available for 1SEG)

(-) Exons   (0, 0)

(no "Exon" information available for 1SEG)

(-) Sequences/Alignments

Asymmetric/Biological Unit
   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
(details for a mapped element are shown in a popup box when the mouse pointer rests over it) 
Chain A from PDB  Type:PROTEIN  Length:64
 aligned with SCX2_ANDAU | P01484 from UniProtKB/Swiss-Prot  Length:85

    Alignment length:64
                                    29        39        49        59        69        79    
            SCX2_ANDAU   20 VKDGYIVDDVNCTYFCGRNAYCNEECTKLKGESGYCQWASPYGNACYCYKLPDHVRTKGPGRCH 83
               SCOP domains d1sega_ A: Scorpion toxin                                        SCOP domains
               CATH domains 1segA00 A:1-64  [code=3.30.30.10, no name defined]               CATH domains
               Pfam domains -Toxin_3-1segA01 A:2-55                                --------- Pfam domains
         Sec.struct. author .eeee.ee...ee....hhhhhhhhhhhh...eeeeeeee..eeeeeeeee............. Sec.struct. author
                 SAPs(SNPs) ---------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ---------------------------------------------------------------- PROSITE
                 Transcript ---------------------------------------------------------------- Transcript
                  1seg A  1 VKDGYIVKNYNCTYFCFRNAYCNEECTKLKGESGYCQWASPYGNACYCYKLPDHVPIRVPGKCH 64
                                    10        20        30        40        50        60
   Legend:   → Mismatch (orange background)
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  extra numbering lines below/above indicate numbering irregularities and modified residue names etc., number ends below/above '|'

 Classification and Annotation

(-) SCOP Domains  (1, 1)

Asymmetric/Biological Unit
(-)
Class: Small proteins (3458)

(-) CATH Domains  (1, 1)

Asymmetric/Biological Unit
(-)
Class: Alpha Beta (26913)

(-) Pfam Domains  (1, 1)

Asymmetric/Biological Unit
(-)
Clan: Knottin_1 (78)

(-) Gene Ontology  (3, 3)

Asymmetric/Biological Unit(hide GO term definitions)
Chain A   (SCX2_ANDAU | P01484)
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.
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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    Asn A:9 - Tyr A:10   [ RasMol ]  
 

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 Related Entries

(-) Entries Sharing at Least One Protein Chain (UniProt ID)

UniProtKB/Swiss-Prot
        SCX2_ANDAU | P01484: 1aho 1ptx 4aei

(-) Related Entries Specified in the PDB File

1aho SCORPION ALPHA TOXIN ACTIVE ON MAMMALS FROM ANDROCTONUS AUSTRALIS HECTOR
1lqh INSECTICIDAL ALPHA SCORPION TOXIN ISOLATED FROM THE VENOM OF SCORPION LEIURUS QUINQUESTRIATUS HEBRAEUS