Annotations: 1EPW

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1epwa1	All beta proteins	Concanavalin A-like lectins/glucanases	Concanavalin A-like lectins/glucanases	Clostridium neurotoxins, the second last domain	Botulinum neurotoxin	(Clostridium botulinum ) [TaxId: 1491 ],	SCOPe (2.08)
A	d1epwa2	All beta proteins	beta-Trefoil	STI-like	Clostridium neurotoxins, C-terminal domain	Botulinum neurotoxin	(Clostridium botulinum ) [TaxId: 1491 ],	SCOPe (2.08)
A	d1epwa3	Alpha and beta proteins (a+b)	Zincin-like	Metalloproteases ('zincins'), catalytic domain	Clostridium neurotoxins, catalytic domain	Botulinum neurotoxin	(Clostridium botulinum ) [TaxId: 1491 ],	SCOPe (2.08)
A	d1epwa4	Coiled coil proteins	Antiparallel coiled-coil	Clostridium neurotoxins, 'coiled-coil' domain	Clostridium neurotoxins, 'coiled-coil' domain	Botulinum neurotoxin	(Clostridium botulinum ) [TaxId: 1491 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	Clostridium neurotoxins, catalytic domain	8023081	4001621	SCOP2 (2022-06-29)
A	SCOP2 Family	Clostridium neurotoxins, coiled-coil domain	8027278	4003857	SCOP2 (2022-06-29)
A	SCOP2 Family	Clostridium neurotoxins, the second last domain	8029073	4002712	SCOP2 (2022-06-29)
A	SCOP2 Family	Clostridium neurotoxins, C-terminal domain	8029659	4002042	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Metalloproteases (zincins), catalytic domain	8035461	3001975	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Clostridium neurotoxins, coiled-coil domain	8039657	3001677	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	Concanavalin A-like lectins/glucanases	8041452	3000120	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	STI-like	8042038	3000715	SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Toxin_R_bind_N	e1epwA1	A: beta sandwiches	X: jelly-roll	H: Concanavalin A-like	T: Concanavalin A-like lectins/glucanases	F: Toxin_R_bind_N	ECOD (1.6)
A	Toxin_R_bind_C	e1epwA2	A: beta duplicates or obligate multimers	X: beta-Trefoil (From Topology)	H: beta-Trefoil (From Topology)	T: beta-Trefoil	F: Toxin_R_bind_C	ECOD (1.6)
A	Peptidase_M27	e1epwA3	A: mixed a+b and a/b	X: Zincin-like	H: Metalloproteases (zincins) catalytic domain (From Topology)	T: Metalloproteases (zincins) catalytic domain	F: Peptidase_M27	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.90.1240.10	Alpha Beta	Alpha-Beta Complex	Zincin-like	Metalloproteases ("zincins"), catalytic domain like	CATH (4.3.0)
A	1.20.1120.10	Mainly Alpha	Up-down Bundle	Clostridium botulinum neurotoxin B, "coiled-coil" domain	Clostridium botulinum neurotoxin b, "coiled-coil" domain	CATH (4.3.0)
A	2.60.120.200	Mainly Beta	Sandwich	Jelly Rolls		CATH (4.3.0)
A	2.80.10.50	Mainly Beta	Trefoil	Trefoil (Acidic Fibroblast Growth Factor, subunit A)		CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF07951	Clostridium neurotoxin, C-terminal receptor binding (Toxin_R_bind_C)	Clostridium neurotoxin, C-terminal receptor binding	The Clostridium neurotoxin family is composed of tetanus neurotoxins and seven serotypes of botulinum neurotoxin. The structure of the botulinum neurotoxin reveals a four domain protein. The N-terminal catalytic domain (Pfam:PF01742), the central tr ...	The Clostridium neurotoxin family is composed of tetanus neurotoxins and seven serotypes of botulinum neurotoxin. The structure of the botulinum neurotoxin reveals a four domain protein. The N-terminal catalytic domain (Pfam:PF01742), the central translocation domains and two receptor binding domains [1]. This domains is the C-terminal receptor binding domain, which adopts a modified beta-trefoil fold with a six stranded beta-barrel and a beta-hairpin triplet capping the domain [1]. The first step in the intoxication process is a binding event between this domains and the pre-synaptic nerve ending [1].	Domain
A	PF07952	Clostridium neurotoxin, Translocation domain (Toxin_trans)	Clostridium neurotoxin, Translocation domain	The Clostridium neurotoxin family is composed of tetanus neurotoxin and seven serotypes of botulinum neurotoxin. The structure of the botulinum neurotoxin reveals a four domain protein. The N-terminal catalytic domain (Pfam:PF01742), the central tra ...	The Clostridium neurotoxin family is composed of tetanus neurotoxin and seven serotypes of botulinum neurotoxin. The structure of the botulinum neurotoxin reveals a four domain protein. The N-terminal catalytic domain (Pfam:PF01742), the central translocation domains and two receptor binding domains [1]. Subsequent to cell surface binding and receptor mediated endocytosis of the neurotoxin, an acid induced conformational change in the neurotoxin translocation domain is believed to allow the domain to penetrate the endosome and from a pore, thereby facilitating the passage of the catalytic domain across the membrane into the cytosol [1]. The structure of the translocation reveals a pair of helices that are 105 Angstroms long and is structurally distinct from other pore forming toxins [1].	Domain
A	PF07953	Clostridium neurotoxin, N-terminal receptor binding (Toxin_R_bind_N)	Clostridium neurotoxin, N-terminal receptor binding	The Clostridium neurotoxin family is composed of tetanus neurotoxin and seven serotypes of botulinum neurotoxin. The structure of the botulinum neurotoxin reveals a four domain protein. The N-terminal catalytic domain (Pfam:PF01742), the central tra ...	The Clostridium neurotoxin family is composed of tetanus neurotoxin and seven serotypes of botulinum neurotoxin. The structure of the botulinum neurotoxin reveals a four domain protein. The N-terminal catalytic domain (Pfam:PF01742), the central translocation domains and two receptor binding domains [1]. This domains is the N-terminal receptor binding domain,which is comprised of two seven-stranded beta-sheets sandwiched together to form a jelly role motif [1]. The role of this domain in receptor binding appears to be indirect.	Domain
A	PF01742	Clostridial neurotoxin zinc protease (Peptidase_M27)	Clostridial neurotoxin zinc protease	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	BOTULINUM NEUROTOXIN TYPE B	binding lipid binding macromolecule transmembrane transporter activity protein transporter activity protein transmembrane transporter activity transporter activity transmembrane transporter activity peptidase activity catalytic activity, acting on a protein metalloendopeptidase activity hydrolase activity metallopeptidase activity catalytic activity endopeptidase activity binding lipid binding macromolecule transmembrane transporter activity protein transporter activity protein transmembrane transporter activity transporter activity transmembrane transporter activity peptidase activity catalytic activity, acting on a protein metalloendopeptidase activity hydrolase activity metallopeptidase activity catalytic activity endopeptidase activity toxin activity cation binding transition metal ion binding zinc ion binding ion binding metal ion binding small molecule binding	proteolysis metabolic process cellular process primary metabolic process protein metabolic process macromolecule metabolic process	cellular anatomical structure membrane extracellular region host cell plasma membrane host cellular component host cell part host cell membrane host cell synapse host cell presynaptic membrane host intracellular part host cell cytoplasm host intracellular region host cell cytosol host cell cytoplasm part cellular anatomical structure membrane extracellular region host cell plasma membrane host cellular component host cell part host cell membrane host cell synapse host cell presynaptic membrane host intracellular part host cell cytoplasm host intracellular region host cell cytosol host cell cytoplasm part host cell cytoplasmic vesicle host intracellular membrane-bounded organelle host intracellular organelle

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR000395	Botulinum/Tetanus toxin, catalytic chain	Domain
A	IPR012928	Clostridium neurotoxin, receptor binding N-terminal	Domain
A	IPR012500	Clostridium neurotoxin, translocation	Domain
A	IPR011065	Kunitz inhibitor STI-like superfamily	Homologous Superfamily
A	IPR013104	Clostridium neurotoxin, receptor-binding C-terminal	Domain
A	IPR013320	Concanavalin A-like lectin/glucanase domain superfamily	Homologous Superfamily
A	IPR036248	Clostridium neurotoxin, translocation domain	Homologous Superfamily

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
A	bontoxilysin M-CSA #626	Botulinum neurotoxin acts by inhibiting neurotransmitter release. It binds to peripheral neuronal synapses, is internalised and moves by retrograde transport up the axon into the spinal cord where it can move between postsynaptic and presynaptic neurons. It disrupts neurotransmitter release by acting as a zinc endopeptidase that cleaves the 76-Gln-\|-Phe-77 bond of synaptobrevin-2(Sb2), one of three SNARE proteins involved in neuronal synaptic vesicle fusion. There are in total 7 serotypes of botulinum neurotoxin. All seven serotypes possess an identical Zn2+-binding motif, HEXXH, but are unique either in substrate selection or in their cleavage site. Their catalytic domains share high degree of sequence homology and holotoxin structures of serotype A and serotype B have been reported to be structurally similar. Botulinum belongs to the same class of neurotoxin with tetanus neurotoxin and they share significant sequence homology. They possess similar structural and functional domains and have a similar mechanism of toxicity. However, Botulinum neurotoxins acts at the neuromuscular junction causing flaccid paralysis by inhibiting the release of acetylcholine into the synapse, while tetanus toxin acts at the central nervous system causing spastic paralysis. In addition botulinum neurotoxin is the protein also known as Botox which is widely used in the cosmetics industry for the reduction of facial wrinkles through relaxation of the muscles.	Defined by 5 residues: HIS:A-229GLU:A-230HIS:A-233GLU:A-267ARG:A-369 \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 3.4.24.69 (PDB Primary Data) Search M-CSA Motif + EC 3.4.24.69

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729.