Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2 FamilyClostridium neurotoxins, catalytic domain 8023081 4001621 SCOP2 (2022-06-29)
ASCOP2 FamilyClostridium neurotoxins, coiled-coil domain 8027278 4003857 SCOP2 (2022-06-29)
ASCOP2 FamilyClostridium neurotoxins, the second last domain 8029073 4002712 SCOP2 (2022-06-29)
ASCOP2 FamilyClostridium neurotoxins, C-terminal domain 8029659 4002042 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyMetalloproteases (zincins), catalytic domain 8035461 3001975 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyClostridium neurotoxins, coiled-coil domain 8039657 3001677 SCOP2 (2022-06-29)
ASCOP2 SuperfamilyConcanavalin A-like lectins/glucanases 8041452 3000120 SCOP2 (2022-06-29)
ASCOP2 SuperfamilySTI-like 8042038 3000715 SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
AToxin_R_bind_Ne1epwA1 A: beta sandwichesX: jelly-rollH: Concanavalin A-likeT: Concanavalin A-like lectins/glucanasesF: Toxin_R_bind_NECOD (1.6)
AToxin_R_bind_Ce1epwA2 A: beta duplicates or obligate multimersX: beta-Trefoil (From Topology)H: beta-Trefoil (From Topology)T: beta-TrefoilF: Toxin_R_bind_CECOD (1.6)
APeptidase_M27e1epwA3 A: mixed a+b and a/bX: Zincin-likeH: Metalloproteases (zincins) catalytic domain (From Topology)T: Metalloproteases (zincins) catalytic domainF: Peptidase_M27ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
PF07951Clostridium neurotoxin, C-terminal receptor binding (Toxin_R_bind_C)Clostridium neurotoxin, C-terminal receptor bindingThe 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
PF07952Clostridium neurotoxin, Translocation domain (Toxin_trans)Clostridium neurotoxin, Translocation domainThe 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
PF07953Clostridium neurotoxin, N-terminal receptor binding (Toxin_R_bind_N)Clostridium neurotoxin, N-terminal receptor bindingThe 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
PF01742Clostridial neurotoxin zinc protease (Peptidase_M27)Clostridial neurotoxin zinc protease- Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
BOTULINUM NEUROTOXIN TYPE B

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

ChainsEnzyme NameDescriptionCatalytic Residues
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 3DM-CSA Motif Definition