1SXT - JenaLib

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Title :   STAPHYLOCOCCAL ENTEROTOXIN TYPE A (SEA) CO-CRYSTALLISED WITH ZINC

Authors :   S. M. Sundstrom

Date :   14 Nov 96 (Deposition) - 19 Nov 97 (Release) - 24 Feb 09 (Revision)

Method :   X-RAY DIFFRACTION

Resolution :   2.70

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

Keywords :   Superantigen, Staphylococcus, Enterotoxin, Toxin (Keyword Search: [Gene Ontology, PubMed, Web (Google)] )

Reference :   M. Sundstrom, D. Hallen, A. Svensson, E. Schad, M. Dohlsten, L. Abrahmsen
The Co-Crystal Structure Of Staphylococcal Enterotoxin Type A With Zn2+ At 2. 7 A Resolution. Implications For Major Histocompatibility Complex Class Ii Binding.
J. Biol. Chem. V. 271 32212 1996
PubMed-ID: 8943278 | Reference-DOI: 10.1074/JBC.271.50.32212
(for further references see the PDB file header)

Molecule 1 - STAPHYLOCOCCAL ENTEROTOXIN TYPE A
	Chains	:	A, B
	Engineered	:	YES
	Expression System	:	ESCHERICHIA COLI
	Expression System Taxid	:	562
	Organism Scientific	:	STAPHYLOCOCCUS AUREUS
	Organism Taxid	:	1280
	Synonym	:	SEA

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

Summary Information (see also Sequences/Alignments below)

Asymmetric Unit (1, 2)

No.	Name	Count	Type	Full Name
1	ZN	2	Ligand/Ion	ZINC ION

Biological Unit 1 (0, 0)

No.	Name	Count	Type	Full Name
1	ZN	-1	Ligand/Ion	ZINC ION

Biological Unit 2 (0, 0)

No.	Name	Count	Type	Full Name
1	ZN	-1	Ligand/Ion	ZINC ION

Asymmetric Unit (2, 2)

No.	Name	Evidence	Residues	Description
1	AC1	SOFTWARE	HIS A:61 , HIS B:187 , HIS B:225 , ASP B:227	BINDING SITE FOR RESIDUE ZN B 401
2	AC2	SOFTWARE	HIS A:187 , HIS A:225 , ASP A:227	BINDING SITE FOR RESIDUE ZN A 501

Asymmetric Unit

No.	Residues
1	A:96	-	A:106
2	B:96	-	B:106

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

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

Asymmetric Unit (2, 4)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	STAPH_STREP_TOXIN_1	PS00277	Staphylococcal enterotoxin/Streptococcal pyrogenic exotoxin signature 1.	ETXA_STAAU	132-141	2	A:108-117 B:108-117
2	STAPH_STREP_TOXIN_2	PS00278	Staphyloccocal enterotoxin/Streptococcal pyrogenic exotoxin signature 2.	ETXA_STAAU	171-194	2	A:147-170 B:147-170

Biological Unit 1 (2, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	STAPH_STREP_TOXIN_1	PS00277	Staphylococcal enterotoxin/Streptococcal pyrogenic exotoxin signature 1.	ETXA_STAAU	132-141	1	A:108-117 -
2	STAPH_STREP_TOXIN_2	PS00278	Staphyloccocal enterotoxin/Streptococcal pyrogenic exotoxin signature 2.	ETXA_STAAU	171-194	1	A:147-170 -

Biological Unit 2 (2, 2)

	PROSITE			UniProtKB		PDB
No.	ID	AC	Description	ID	Location	Count	Location
1	STAPH_STREP_TOXIN_1	PS00277	Staphylococcal enterotoxin/Streptococcal pyrogenic exotoxin signature 1.	ETXA_STAAU	132-141	1	- B:108-117
2	STAPH_STREP_TOXIN_2	PS00278	Staphyloccocal enterotoxin/Streptococcal pyrogenic exotoxin signature 2.	ETXA_STAAU	171-194	1	- B:147-170

(no "Exon" information available for 1SXT)

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
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Chain A from PDB  Type:PROTEIN  Length:224
 aligned with ETXA_STAAU | P0A0L2 from UniProtKB/Swiss-Prot  Length:257

    Alignment length:224
                                    43        53        63        73        83        93       103       113       123       133       143       153       163       173       183       193       203       213       223       233       243       253    
           ETXA_STAAU    34 KDLRKKSELQGTALGNLKQIYYYNEKAKTENKESHDQFLQHTILFKGFFTDHSWYNDLLVDFDSKDIVDKYKGKKVDLYGAYYGYQCAGGTPNKTACMYGGVTLHDNNRLTEEKKVPINLWLDGKQNTVPLETVKTNKKNVTVQELDLQARRYLQEKYNLYNSDVFDGKVQRGLIVFHTSTEPSVNYDLFGAQGQYSNTLLRIYRDNKTINSENMHIDIYLYTS 257
               SCOP domains d1sxta1 A:10-120 Staphylococcal enterotoxin A, SEA                                                             d1sxta2 A:121-233 Staphylococcal enterotoxin A, SEA                                                               SCOP domains
               CATH domains 1sxtA02               1sxtA01 A:32-114  [code=2.40.50.110, no name defined]                              --1sxtA02 A:10-31,A:117-232  [code=3.10.20.120, no name defined]                                                      - CATH domains
               Pfam domains -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Pfam domains
         Sec.struct. author ............hhhhhhhhh....eeee............eeee...........eeeee...hhhhhhh....eeeeee..........hhheeeee..eee............eeeeee..eeee...........eeehhhhhhhhhhhhhh.......hhh.....eeeeeee......eeee........hhhhhhhhhh..eee....eeeeeee.. Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE --------------------------------------------------------------------------------------------------STAPH_STRE-----------------------------STAPH_STREP_TOXIN_2     --------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1sxt A  10 KDLRKKSELQGTALGNLKQIYYYNEKAKTENKESHDQFLQHTILFKGFFTDHSWYNDLLVDFDSKDIVDKYKGKKVDLYGAYYGYQCAGGTPNKTACMYGGVTLHDNNRLTEEKKVPINLWLDGKQNTVPLETVKTNKKNVTVQELDLQARRYLQEKYNLYNSDVFDGKVQRGLIVFHTSTEPSVNYDLFGAQGQYSNTLLRIYRDNKTINSENMHIDIYLYTS 233
                                    19        29        39        49        59        69        79        89        99       109       119       129       139       149       159       169       179       189       199       209       219       229

Chain B from PDB  Type:PROTEIN  Length:220
 aligned with ETXA_STAAU | P0A0L2 from UniProtKB/Swiss-Prot  Length:257

    Alignment length:224
                                    43        53        63        73        83        93       103       113       123       133       143       153       163       173       183       193       203       213       223       233       243       253    
           ETXA_STAAU    34 KDLRKKSELQGTALGNLKQIYYYNEKAKTENKESHDQFLQHTILFKGFFTDHSWYNDLLVDFDSKDIVDKYKGKKVDLYGAYYGYQCAGGTPNKTACMYGGVTLHDNNRLTEEKKVPINLWLDGKQNTVPLETVKTNKKNVTVQELDLQARRYLQEKYNLYNSDVFDGKVQRGLIVFHTSTEPSVNYDLFGAQGQYSNTLLRIYRDNKTINSENMHIDIYLYTS 257
               SCOP domains d1sxtb1 B:10-120 Staphylococcal enterotoxin A, SEA                                                             d1sxtb2 B:121-233 Staphylococcal enterotoxin A, SEA                                                               SCOP domains
               CATH domains 1sxtB02               1sxtB01 B:32-114  [code=2.40.50.110, no name defined]                              --1sxtB02 B:10-31,B:117-232  [code=3.10.20.120, no name defined]                                                      - CATH domains
           Pfam domains (1) ---------------Stap_Strp_toxin-1sxtB03 B:25-114                                                          --------Stap_Strp_tox_C-1sxtB01 B:123-231                                                                            -- Pfam domains (1)
           Pfam domains (2) ---------------Stap_Strp_toxin-1sxtB04 B:25-114                                                          --------Stap_Strp_tox_C-1sxtB02 B:123-231                                                                            -- Pfam domains (2)
         Sec.struct. author .....hhh..hhhhhhhhhhhh...eeee............eeeee..........eeeee...hhhhhh.....eeeeee.......----..eeeee..eee.............eeeee..eeee..hhh......eeehhhhhhhhhhhhhhhh.....hhh.....eeeeeee......eeee........hhhhhhhh....eee....eeeeeee.. Sec.struct. author
                 SAPs(SNPs) -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- SAPs(SNPs)
                    PROSITE --------------------------------------------------------------------------------------------------STAPH_STRE-----------------------------STAPH_STREP_TOXIN_2     --------------------------------------------------------------- PROSITE
                 Transcript -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- Transcript
                 1sxt B  10 KDLRKKSELQGTALGNLKQIYYYNEKAKTENKESHDQFLQHTILFKGFFTDHSWYNDLLVDFDSKDIVDKYKGKKVDLYGAYYGYQCA----NKTACMYGGVTLHDNNRLTEEKKVPINLWLDGKQNTVPLETVKTNKKNVTVQELDLQARRYLQEKYNLYNSDVFDGKVQRGLIVFHTSTEPSVNYDLFGAQGQYSNTLLRIYRDNKTINSENMHIDIYLYTS 233
                                    19        29        39        49        59        69        79        89       | -  |    109       119       129       139       149       159       169       179       189       199       209       219       229    
                                                                                                                  97  102

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 '\|'

Asymmetric Unit

Classes(

)

Architectures( (-)

)

Topologies( (-)

)

Homologous Superfamilies( (-)

)

Organisms( (-)

)

Class: Alpha Beta (26913)

Architecture: Roll (3276)

Topology: Ubiquitin-like (UB roll) (674)

Homologous Superfamily: [code=3.10.20.120, no name defined] (91)

Staphylococcus aureus. Organism_taxid: 1280. (14)

1a	1sxtA02	A:10-31,A:117-232
1b	1sxtB02	B:10-31,B:117-232

Class: Mainly Beta (13760)

Architecture: Beta Barrel (4804)

Topology: OB fold (Dihydrolipoamide Acetyltransferase, E2P) (1040)

Homologous Superfamily: [code=2.40.50.110, no name defined] (136)

Staphylococcus aureus. Organism_taxid: 1280. (14)

2a	1sxtA01	A:32-114
2b	1sxtB01	B:32-114

Asymmetric Unit

Clans(

)

Families(

)

Organisms( (-)

)

Clan: Ant-toxin_C (48)

Family: Stap_Strp_tox_C (48)

Staphylococcus aureus (41)

1a	Stap_Strp_tox_C-1sxtB01	B:123-231
1b	Stap_Strp_tox_C-1sxtB02	B:123-231

Clan: no clan defined [family: Stap_Strp_toxin] (39)

Family: Stap_Strp_toxin (39)

Staphylococcus aureus (33)

2a	Stap_Strp_toxin-1sxtB03	B:25-114
2b	Stap_Strp_toxin-1sxtB04	B:25-114

Asymmetric Unit(hide GO term definitions)

Chain A,B (ETXA_STAAU | P0A0L2)

molecular function
	GO:0042289	MHC class II protein binding	Interacting selectively and non-covalently with major histocompatibility complex class II molecules; a set of molecules displayed on cell surfaces that are responsible for lymphocyte recognition and antigen presentation.
	GO:0046872	metal ion binding	Interacting selectively and non-covalently with any metal ion.
	GO:0005515	protein binding	Interacting selectively and non-covalently with any protein or protein complex (a complex of two or more proteins that may include other nonprotein molecules).
biological process
	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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