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(-) Description

Title :  SCORPION TOXIN LQH-ALPHA-IT
 
Authors :  R. Kahn, I. Karbat, M. Gurevitz, F. Frolow
Date :  23 Aug 05  (Deposition) - 05 Sep 06  (Release) - 24 Feb 09  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  1.10
Chains :  Asym./Biol. Unit :  A
Keywords :  Alpha Toxin, Scorpion (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )
 
Reference :  R. Kahn, I. Karbat, M. Gurevitz, F. Frolow
X-Ray Structures Of Lqh-Alpha-It And Lqh-Alpha-It8D9D10V Mutant
To Be Published
PubMed: search
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - NEUROTOXIN ALPHA-IT
    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
    Organism Common: EGYPTIAN SCORPION
    Organism Scientific: LEIURUS QUINQUESTRIATUS
    Organism Taxid: 6883

 Structural Features

(-) Chains, Units

  1
Asymmetric/Biological Unit : A

Summary Information (see also Sequences/Alignments below)

(-) Ligands, Modified Residues, Ions  (8, 18)

Asymmetric/Biological Unit (8, 18)
No.NameCountTypeFull Name
1CL3Ligand/IonCHLORIDE ION
2DR01Ligand/IonN-(HYDROXYMETHYL)-N,N-DIMETHYLHEXAN-1-AMINIUM
3DR81Ligand/IonN,N,N-TRIMETHYLHEPTA-1,3,5-TRIYN-1-AMINIUM
4EDO5Ligand/Ion1,2-ETHANEDIOL
5EOH3Ligand/IonETHANOL
6K1Ligand/IonPOTASSIUM ION
7MOH3Ligand/IonMETHANOL
8NO31Ligand/IonNITRATE ION

(-) Sites  (18, 18)

Asymmetric Unit (18, 18)
No.NameEvidenceResiduesDescription
01AC1SOFTWARETYR A:36 , TYR A:50 , DR0 A:1002BINDING SITE FOR RESIDUE DR8 A 3001
02AC2SOFTWAREASP A:20 , TYR A:36 , CYS A:37 , TRP A:39 , CL A:1005 , EDO A:2005 , DR8 A:3001 , HOH A:9007BINDING SITE FOR RESIDUE DR0 A 1002
03AC3SOFTWARETRP A:39 , DR0 A:1002 , HOH A:9007BINDING SITE FOR RESIDUE CL A 1005
04AC4SOFTWAREVAL A:14 , ARG A:59 , CYS A:64 , EOH A:5001BINDING SITE FOR RESIDUE CL A 1006
05AC5SOFTWARESER A:34 , GLY A:35 , TYR A:50 , EDO A:2004BINDING SITE FOR RESIDUE CL A 1007
06AC6SOFTWAREASP A:4 , SER A:33 , TYR A:50 , HOH A:9030 , HOH A:9039BINDING SITE FOR RESIDUE NO3 A 1001
07AC7SOFTWAREGLU A:16 , TYR A:22BINDING SITE FOR RESIDUE K A 2001
08AC8SOFTWARETYR A:6 , ASP A:20 , ALA A:21 , ASN A:24 , EDO A:2004 , HOH A:9003 , HOH A:9014BINDING SITE FOR RESIDUE EDO A 2003
09AC9SOFTWAREASP A:20 , ASN A:24 , GLY A:35 , TYR A:36 , TRP A:48 , CL A:1007 , EDO A:2003BINDING SITE FOR RESIDUE EDO A 2004
10BC1SOFTWAREPHE A:18 , ARG A:19 , TRP A:39 , ALA A:40 , DR0 A:1002 , HOH A:9008BINDING SITE FOR RESIDUE EDO A 2005
11BC2SOFTWAREPHE A:18 , TRP A:39 , ALA A:40 , ASN A:45BINDING SITE FOR RESIDUE EDO A 2101
12BC3SOFTWAREASN A:30 , ASN A:55 , VAL A:56 , HOH A:9068BINDING SITE FOR RESIDUE EDO A 2201
13BC4SOFTWAREALA A:8 , TYR A:15BINDING SITE FOR RESIDUE MOH A 4001
14BC5SOFTWAREVAL A:14 , GLU A:16 , ARG A:19 , TYR A:43 , CL A:1006 , HOH A:9023BINDING SITE FOR RESIDUE EOH A 5001
15BC6SOFTWARELYS A:42 , TYR A:43 , ARG A:59 , VAL A:60 , PRO A:61 , HOH A:9044BINDING SITE FOR RESIDUE EOH A 6001
16BC7SOFTWAREASP A:54 , PRO A:57BINDING SITE FOR RESIDUE MOH A 7001
17BC8SOFTWARETHR A:28 , GLY A:31 , ASP A:54 , ASN A:55 , HOH A:9060 , HOH A:9063 , HOH A:9066BINDING SITE FOR RESIDUE EOH A 8001
18BC9SOFTWAREARG A:19 , GLU A:25 , HOH A:9031 , HOH A:9036BINDING SITE FOR RESIDUE MOH A 9001

(-) SS Bonds  (4, 4)

Asymmetric/Biological Unit
No.Residues
1A:13 -A:64
2A:17 -A:37
3A:23 -A:47
4A:27 -A:49

(-) Cis Peptide Bonds  (1, 1)

Asymmetric/Biological Unit
No.Residues
1Asn A:10 -Tyr A:11

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 2ASC)

(-) PROSITE Motifs  (0, 0)

(no "PROSITE Motif" information available for 2ASC)

(-) Exons   (0, 0)

(no "Exon" information available for 2ASC)

(-) 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    
   Show mapping: SCOP domains CATH domains Pfam domains Secondary structure (by author)
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:65
 aligned with SCXA_LEIQH | P17728 from UniProtKB/Swiss-Prot  Length:85

    Alignment length:65
                                    28        38        48        58        68        78     
            SCXA_LEIQH   19 SVRDAYIAKNYNCVYECFRDAYCNELCTKNGASSGYCQWAGKYGNACWCYALPDNVPIRVPGKCH 83
               SCOP domains d2asca_ A: alpha toxin                                            SCOP domains
               CATH domains 2ascA00 A:1-65  [code=3.30.30.10, no name defined]                CATH domains
               Pfam domains ----------------------------------------------------------------- Pfam domains
         Sec.struct. author .eeeee.ee...ee....hhhhhhhhhhhh...eeeeeeee..eeeeeeeeee............ Sec.struct. author
                 SAPs(SNPs) ----------------------------------------------------------------- SAPs(SNPs)
                    PROSITE ----------------------------------------------------------------- PROSITE
                 Transcript ----------------------------------------------------------------- Transcript
                  2asc A  1 MVRDAYIAKNYNCVYECFRDAYCNELCTKNGASSGYCQWAGKYGNACWCYALPDNVPIRVPGKCR 65
                                    10        20        30        40        50        60
   Legend:   → Mismatch (orange background)
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  x → Chemical Group (purple background, 'x', labelled with number + name, e.g. ACE or NH2)
  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  (0, 0)

(no "Pfam Domain" information available for 2ASC)

(-) Gene Ontology  (3, 3)

Asymmetric/Biological Unit(hide GO term definitions)
Chain A   (SCXA_LEIQH | P17728)
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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 Related Entries

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

UniProtKB/Swiss-Prot
        SCXA_LEIQH | P17728: 1lqh 1lqi 2atb 2yeo

(-) Related Entries Specified in the PDB File

1lqh INSECTICIDAL SCORPION TOXIN ISOLATED FROM THE VENOM OF SCORPION LEIURUS QUINQUESTRIATUS HEBRAEUS, STRUCTURE SOLVED BY NMR