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Description

Title :   CRYSTAL STRUCTURE OF THE SCORPION TOXIN BMBKTTX1

Authors :   A. Szyk, W. Lu, C. Xu, J. Lubkowski

Date :   23 Sep 03 (Deposition) - 02 Mar 04 (Release) - 24 Feb 09 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   1.72

Chains :   Asym. Unit : A,B
Biol. Unit 1: A  (1x)
Biol. Unit 2: B  (1x)

Keywords :   Siras From S Atoms, Scorpion Toxin, Bmbkttx1, Reductive Dimethylation (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   A. Szyk, W. Lu, C. Xu, J. Lubkowski
Structure Of The Scorpion Toxin Bmbkttx1 Solved From Single Wavelength Anomalous Scattering Of Sulfur.
J. Struct. Biol. V. 145 289 2004
PubMed-ID: 14960379 | Reference-DOI: 10.1016/J.JSB.2003.11.012
(for further references see the PDB file header)

Compounds

Molecule 1 - NEUROTOXIN BMK37
	Chains	:	A, B
	Engineered	:	YES
	Other Details	:	SEQUENCE CORRESPONDS TO THAT OF NATURALLY OCCURING TOXIN FROM SCORPION BUTHUS MARTENSI KARSCH. PROTEIN WAS SYNTHESIZED USING BOC CHEMISTRY. AFTER FOLDING ALL PRIMARY AMINO GROUPS OF BMBKTTX1 (FIVE LYSINE RESIDUES AND THE N-TERMINUS) WERE DIMETHYLATED.
	Synonym	:	BMBKTTX1
	Synthetic	:	YES

Structural Features

Chains, Units

		1	2
Asymmetric Unit	:	A	B
Biological Unit 1 (1x)	:	A
Biological Unit 2 (1x)	:		B

Summary Information (see also Sequences/Alignments below)

Ligands, Modified Residues, Ions (2, 12)

Asymmetric Unit (2, 12)

No.	Name	Count	Type	Full Name
1	LAL	2	Mod. Amino Acid	N,N-DIMETHYL-L-ALANINE
2	MLY	10	Mod. Amino Acid	N-DIMETHYL-LYSINE

Biological Unit 1 (2, 6)

No.	Name	Count	Type	Full Name
1	LAL	1	Mod. Amino Acid	N,N-DIMETHYL-L-ALANINE
2	MLY	5	Mod. Amino Acid	N-DIMETHYL-LYSINE

Biological Unit 2 (2, 6)

No.	Name	Count	Type	Full Name
1	LAL	1	Mod. Amino Acid	N,N-DIMETHYL-L-ALANINE
2	MLY	5	Mod. Amino Acid	N-DIMETHYL-LYSINE

Sites (0, 0)

(no "Site" information available for 1R1G)

SS Bonds (6, 6)

Asymmetric Unit

No.	Residues
1	A:3	-	A:22
2	A:8	-	A:27
3	A:12	-	A:29
4	B:3	-	B:22
5	B:8	-	B:27
6	B:12	-	B:29

Cis Peptide Bonds (0, 0)

(no "Cis Peptide Bond" information available for 1R1G)

Sequence-Structure Mapping

SAPs(SNPs)/Variants (0, 0)

(no "SAP(SNP)/Variant" information available for 1R1G)

PROSITE Motifs (1, 2)

Asymmetric Unit (1, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	SCORP_SHORT_TOXIN	PS01138	Scorpion short toxins signature.	KA191_MESMA	8-29	2	A:8-29 B:8-29

Biological Unit 1 (1, 1)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	SCORP_SHORT_TOXIN	PS01138	Scorpion short toxins signature.	KA191_MESMA	8-29	1	A:8-29 -

Biological Unit 2 (1, 1)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	SCORP_SHORT_TOXIN	PS01138	Scorpion short toxins signature.	KA191_MESMA	8-29	1	- B:8-29

Exons (0, 0)

(no "Exon" information available for 1R1G)

Sequences/Alignments

Asymmetric 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:31
 aligned with KA191_MESMA | P83407 from UniProtKB/Swiss-Prot  Length:31

    Alignment length:31
                                    10        20        30 
           KA191_MESMA    1 AACYSSDCRVKCVAMGFSSGKCINSKCKCYK 31
               SCOP domains d1r1ga_ A: Neurotoxin bmk37     SCOP domains
               CATH domains ------------------------------- CATH domains
               Pfam domains ------------------------------- Pfam domains
         Sec.struct. author ...hhhhhhhhhhhh...eeeee..eeeee. Sec.struct. author
                 SAPs(SNPs) ------------------------------- SAPs(SNPs)
                    PROSITE -------SCORP_SHORT_TOXIN     -- PROSITE
                 Transcript ------------------------------- Transcript
                  1r1g A  1 aACYSSDCRVkCVAMGFSSGkCINSkCkCYk 31
                            |       10|       20|    | |30|
                            |        11-MLY    21-MLY| |  |
                            1-LAL                   26-MLY|
                                                      28-MLY
                                                         31-MLY

Chain B from PDB  Type:PROTEIN  Length:31
 aligned with KA191_MESMA | P83407 from UniProtKB/Swiss-Prot  Length:31

    Alignment length:31
                                    10        20        30 
           KA191_MESMA    1 AACYSSDCRVKCVAMGFSSGKCINSKCKCYK 31
               SCOP domains d1r1gb_ B: Neurotoxin bmk37     SCOP domains
               CATH domains ------------------------------- CATH domains
           Pfam domains (1) Toxin_2-1r1gB01 B:1-30        - Pfam domains (1)
           Pfam domains (2) Toxin_2-1r1gB02 B:1-30        - Pfam domains (2)
         Sec.struct. author ...hhhhhhhhhhhh...eeeee..eeeee. Sec.struct. author
                 SAPs(SNPs) ------------------------------- SAPs(SNPs)
                    PROSITE -------SCORP_SHORT_TOXIN     -- PROSITE
                 Transcript ------------------------------- Transcript
                  1r1g B  1 aACYSSDCRVkCVAMGFSSGkCINSkCkCYk 31
                            |       10|       20|    | |30|
                            |        11-MLY    21-MLY| |  |
                            1-LAL                   26-MLY|
                                                      28-MLY
                                                         31-MLY

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 Unit

Classes(

)

Folds(

)

Superfamilies( (-)

)

Families(

)

Protein Domains( (-)

)

Organisms( (-)

)

Class: Small proteins (3458)

Fold: Knottins (small inhibitors, toxins, lectins) (761)

Superfamily: Scorpion toxin-like (155)

Family: Short-chain scorpion toxins (55)

Protein domain: Neurotoxin bmk37 (2)

Chinese scorpion (Buthus martensi karsch) [TaxId: 34649] (2)

1a	d1r1ga_	A:
1b	d1r1gb_	B:

CATH Domains (0, 0)

(no "CATH Domain" information available for 1R1G)

Pfam Domains (1, 2)

Asymmetric Unit

Clans(

)

Families(

)

Organisms( (-)

)

Clan: Knottin_1 (78)

Family: Toxin_2 (23)

Mesobuthus martensii (Manchurian scorpion) (Buthus martensii) (5)

1a	Toxin_2-1r1gB01	B:1-30
1b	Toxin_2-1r1gB02	B:1-30

Gene Ontology (4, 4)

Asymmetric Unit(hide GO term definitions)

Chain A,B (KA191_MESMA | P83407)

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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Related Entries

Entries Sharing at Least One Protein Chain (UniProt ID)

UniProtKB/Swiss-Prot
	KA191_MESMA \| P83407	:	1q2k 3e8y

Related Entries Specified in the PDB File

1q2k	SOLUTION STRUCTURE OF BMBKTTX1