1S0G

Crystal structure of botulinum neurotoxin type B apo form


ChainDomainClassArchitectureTopologyHomology
3.90.1240.10 Alpha Beta Alpha-Beta Complex Zincin-like Metalloproteases ("zincins"), catalytic domain like
1.20.1120.10 Mainly Alpha Up-down Bundle Clostridium botulinum neurotoxin B, "coiled-coil" domain Clostridium botulinum neurotoxin b, "coiled-coil" domain
1.20.1120.10 Mainly Alpha Up-down Bundle Clostridium botulinum neurotoxin B, "coiled-coil" domain Clostridium botulinum neurotoxin b, "coiled-coil" domain
2.60.120.200 Mainly Beta Sandwich Jelly Rolls
2.80.10.50 Mainly Beta Trefoil Trefoil (Acidic Fibroblast Growth Factor, subunit A)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionIdentifierDescriptionCommentsSource
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