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(-) Description

Title :  CIS/TRANS ISOMERIZATION OF NON-PROLYL PEPTIDE BOND OBSERVED IN CRYSTAL STRUCTURE OF AN SCORPION TOXIN
 
Authors :  R. J. Guan, X. L. He, M. Wang, Y. Xiang, D. C. Wang
Date :  23 Jan 02  (Deposition) - 16 Sep 03  (Release) - 24 Feb 09  (Revision)
Method :  X-RAY DIFFRACTION
Resolution :  1.40
Chains :  Asym./Biol. Unit :  A,B
Keywords :  Non-Prolyl Cis Peptide Bond, Cis/Trans Isomerization, X-Ray Structure, Dimeric Structure, Scorpion Toxin (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )
 
Reference :  R. J. Guan, Y. Xiang, X. L. He, C. G. Wang, M. Wang, Y. Zhang, E. J. Sundberg, D. C. Wang
Structural Mechanism Governing Cis And Trans Isomeric States And An Intramolecular Switch For Cis/Trans Isomerization Of A Non-Proline Peptide Bond Observed In Crystal Structures Of Scorpion Toxins.
J. Mol. Biol. V. 341 1189 2004
PubMed-ID: 15321715  |  Reference-DOI: 10.1016/J.JMB.2004.06.067
(for further references see the PDB file header)

(-) Compounds

Molecule 1 - ALPHA-LIKE TOXIN BMK-M7
    Chains: A, B
    Organism Common: CHINESE SCORPION
    Organism Scientific: MESOBUTHUS MARTENSII
    Organism Taxid: 34649
    Synonym: BMK M7, BMKM7
    Tissue: TAIL VENOM GLAND

 Structural Features

(-) Chains, Units

  12
Asymmetric/Biological Unit : AB

Summary Information (see also Sequences/Alignments below)

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

(no "Ligand,Modified Residues,Ions" information available for 1KV0)

(-) Sites  (0, 0)

(no "Site" information available for 1KV0)

(-) SS Bonds  (8, 8)

Asymmetric/Biological Unit
No.Residues
1A:12 -A:63
2A:16 -A:36
3A:22 -A:46
4A:26 -A:48
5B:12 -B:63
6B:16 -B:36
7B:22 -B:46
8B:26 -B:48

(-) Cis Peptide Bonds  (2, 2)

Asymmetric/Biological Unit
No.Residues
1Pro A:9 -His A:10
2Pro B:9 -His B:10

 Sequence-Structure Mapping

(-) SAPs(SNPs)/Variants  (0, 0)

(no "SAP(SNP)/Variant" information available for 1KV0)

(-) PROSITE Motifs  (0, 0)

(no "PROSITE Motif" information available for 1KV0)

(-) Exons   (0, 0)

(no "Exon" information available for 1KV0)

(-) 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:66
 aligned with SCX7_MESMA | P59854 from UniProtKB/Swiss-Prot  Length:66

    Alignment length:66
                                    10        20        30        40        50        60      
            SCX7_MESMA    1 VRDGYIALPHNCAYGCLNNEYCNNLCTKDGAKIGYCNIVGKYGNACWCIQLPDNVPIRVPGRCHPA 66
               SCOP domains d1kv0a_ A: Tx10 alpha-like toxin                                   SCOP domains
               CATH domains 1kv0A00 A:1-66  [code=3.30.30.10, no name defined]                 CATH domains
               Pfam domains ------------------------------------------------------------------ Pfam domains
         Sec.struct. author .eeee.ee...ee....hhhhhhhhhhhh...eeeeee.....eeeeeeee............... Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------ SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------ PROSITE
                 Transcript ------------------------------------------------------------------ Transcript
                  1kv0 A  1 VRDGYIALPHNCAYGCLNNEYCNNLCTKDGAKIGYCNIVGKYGNACWCIQLPDNVPIRVPGRCHPA 66
                                    10        20        30        40        50        60      


Chain B from PDB  Type:PROTEIN  Length:66
 aligned with SCX7_MESMA | P59854 from UniProtKB/Swiss-Prot  Length:66

    Alignment length:66
                                    10        20        30        40        50        60      
            SCX7_MESMA    1 VRDGYIALPHNCAYGCLNNEYCNNLCTKDGAKIGYCNIVGKYGNACWCIQLPDNVPIRVPGRCHPA 66
               SCOP domains d1kv0b_ B: Tx10 alpha-like toxin                                   SCOP domains
               CATH domains 1kv0B00 B:1-66  [code=3.30.30.10, no name defined]                 CATH domains
           Pfam domains (1) -Toxin_3-1kv0B01 B:2-55                                ----------- Pfam domains (1)
           Pfam domains (2) -Toxin_3-1kv0B02 B:2-55                                ----------- Pfam domains (2)
         Sec.struct. author .eeee.ee...ee....hhhhhhhhhhhh...eeeeee.....eeeeeeee............... Sec.struct. author
                 SAPs(SNPs) ------------------------------------------------------------------ SAPs(SNPs)
                    PROSITE ------------------------------------------------------------------ PROSITE
                 Transcript ------------------------------------------------------------------ Transcript
                  1kv0 B  1 VRDGYIALPHNCAYGCLNNEYCNNLCTKDGAKIGYCNIVGKYGNACWCIQLPDNVPIRVPGRCHPA 66
                                    10        20        30        40        50        60
   Legend:   → Mismatch (orange background)
  - → Gap (green background, '-', border residues have a numbering label)
    → Modified Residue (blue background, lower-case, 'x' indicates undefined single-letter code, labelled with number + name)
  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, 2)

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

(-) CATH Domains  (1, 2)

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

(-) Pfam Domains  (1, 2)

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

(-) Gene Ontology  (3, 3)

Asymmetric/Biological Unit(hide GO term definitions)
Chain A,B   (SCX7_MESMA | P59854)
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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  Cis Peptide Bonds
    Pro A:9 - His A:10   [ RasMol ]  
    Pro B:9 - His B:10   [ RasMol ]  
 

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 Related Entries

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

(no "Entries Sharing at Least One Protein Chain" available for 1KV0)

(-) Related Entries Specified in the PDB File

1chz 1CHZ CONTAINS A NEW NEUROTOXIN BMK M2
1djt 1DJT CONTAINS SCORPION ALPHA-LIKE TOXIN BMK M1
1sn1 1SN1 CONTAINS SCORPION NEUROTOXIN BMK M1
1sn4 1SN4 CONTAINS SCORPION NEUROTOXIN BMK M4