2I61 - JenaLib

Title :   DEPRESSANT ANTI-INSECT NEUROTOXIN, LQHIT2 FROM LEIURUS QUINQUESTRIATUS HEBRAEUS

Authors :   F. Frolow, M. Gurevitz, I. Karbat, M. Turkov, D. Gordon

Date :   27 Aug 06 (Deposition) - 26 Dec 06 (Release) - 24 Feb 09 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   1.20

Chains :   Asym./Biol. Unit : A

Keywords :   Scorpion Toxin, Depressant, Anti-Insect, Sodium Channel Modifer (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   I. Karbat, M. Turkov, L. Cohen, R. Kahn, D. Gordon, M. Gurevitz, F. Frolow
X-Ray Structure And Mutagenesis Of The Scorpion Depressant Toxin Lqhit2 Reveals Key Determinants Crucial For Activity And Anti-Insect Selectivity.
J. Mol. Biol. V. 366 586 2007
PubMed-ID: 17166514 | Reference-DOI: 10.1016/J.JMB.2006.10.085
(for further references see the PDB file header)

Compounds

Molecule 1 - INSECT TOXIN 2
	Chains	:	A
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI BL21
	Expression System Plasmid	:	PET11C
	Expression System Strain	:	BL21
	Expression System Taxid	:	511693
	Expression System Vector Type	:	PLASMID
	Fragment	:	PEPTIDE MODIFIER OF VOLTAGE-GATED SODIUM CHANNELS
	Organism Scientific	:	LEIURUS QUINQUESTRIATUS HEBRAEUS
	Organism Taxid	:	6884
	Strain	:	HEBRAEUS
	Synonym	:	LQH IT2, LQHIT2, LQHIT2-44, ANTI-INSECT DEPRESSANT NEUROTOXIN

Structural Features

Chains, Units

Ligands, Modified Residues, Ions (5, 9)

Sites (9, 9)

Asymmetric Unit (9, 9)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	ASP A:8 , TRP A:36 , HOH A:74 , HOH A:83 , HOH A:84	BINDING SITE FOR RESIDUE LI A 62
2	AC2	SOFTWARE	ASP A:8 , GLU A:19 , THR A:59 , HOH A:79	BINDING SITE FOR RESIDUE LI A 63
3	AC3	SOFTWARE	LYS A:26 , HOH A:88 , HOH A:109 , HOH A:151	BINDING SITE FOR RESIDUE LI A 64
4	AC4	SOFTWARE	ARG A:7 , ASN A:18 , ASN A:58 , HOH A:74 , HOH A:82 , HOH A:99 , HOH A:102 , HOH A:127 , HOH A:133 , HOH A:139 , HOH A:150	BINDING SITE FOR RESIDUE SO4 A 65
5	AC5	SOFTWARE	GLY A:61 , HOH A:99 , HOH A:133	BINDING SITE FOR RESIDUE EDO A 66
6	AC6	SOFTWARE	LYS A:5 , ASP A:22 , LYS A:26 , TYR A:32 , THR A:57 , THR A:59 , HOH A:94 , HOH A:120 , HOH A:155	BINDING SITE FOR RESIDUE EDO A 67
7	AC7	SOFTWARE	MET A:0 , TYR A:28 , LYS A:51 , GLU A:56	BINDING SITE FOR RESIDUE EDO A 68
8	AC8	SOFTWARE	CYS A:10 , LYS A:11 , TRP A:53 , CYS A:60	BINDING SITE FOR RESIDUE CO2 A 69
9	AC9	SOFTWARE	LYS A:5 , ARG A:6 , ARG A:7 , TYR A:28 , ASP A:50 , LYS A:51 , SER A:55 , HOH A:134	BINDING SITE FOR RESIDUE ACY A 70

SS Bonds (4, 4)

Cis Peptide Bonds (0, 0)

Sequence-Structure Mapping

SAPs(SNPs)/Variants (0, 0)

PROSITE Motifs (0, 0)

Exons (0, 0)

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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Chain A from PDB  Type:PROTEIN  Length:62
 aligned with SIX2_LEIQH | Q26292 from UniProtKB/Swiss-Prot  Length:85

    Alignment length:62
                                    30        40        50        60        70        80  
            SIX2_LEIQH   21 ADGYIKRRDGCKVACLIGNEGCDKECKAYGGSYGYCWTWGLACWCEGLPDDKTWKSETNTCG 82
               SCOP domains d2i61a_ A: automated matches                                   SCOP domains
               CATH domains 2i61A00 A:0-61  [code=3.30.30.10, no name defined]             CATH domains
               Pfam domains -------------------------------------------------------------- Pfam domains
         Sec.struct. author .................hhhhhhhhhhhh...eee........eee..hhhhh.hhhhh... Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------- SAPs(SNPs)
                    PROSITE -------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------- Transcript
                  2i61 A  0 MDGYIKRRDGCKVACLIGNEGCDKECKAYGGSYGYCWTWGLACWCEGLPDDKTWKSETNTCG 61
                                     9        19        29        39        49        59

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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)

CATH Domains (1, 1)

Pfam Domains (0, 0)

Gene Ontology (3, 3)

Asymmetric/Biological Unit(hide GO term definitions)

Chain A (SIX2_LEIQH | Q26292)

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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