title: Different substrate recognition requirements for cleavage of synaptobrevin-2 by Clostridium baratii and Clostridium botulinum type F neurotoxins.
abstract: Botulinum neurotoxins (BoNTs) cause botulism, which can be fatal if it is untreated. BoNTs cleave proteins necessary for nerve transmission, resulting in paralysis. The in vivo protein target has been reported for all seven serotypes of BoNT, i.e., serotypes A to G. Knowledge of the cleavage sites has led to the development of several assays to detect BoNT based on its ability to cleave a peptide substrate derived from its in vivo protein target. Most serotypes of BoNT can be subdivided into subtypes, and previously, we demonstrated that three of the currently known subtypes of BoNT/F cleave a peptide substrate, a shortened version of synaptobrevin-2, between Q58 and K59. However, our research indicated that Clostridium baratii type F toxin did not cleave this peptide. In this study, we detail experiments demonstrating that Clostridium baratii type F toxin cleaves recombinant synaptobrevin-2 in the same location as that cleaved by proteolytic F toxin. In addition, we demonstrate that Clostridium baratii type F toxin can cleave a peptide substrate based on the sequence of synaptobrevin-2. This peptide substrate is an N-terminal extension of the original peptide substrate used for detection of other BoNT/F toxins and can be used to detect four of the currently known BoNT/F subtypes by mass spectrometry.
authors.affiliation: Centers for Disease Control and Prevention, National Center for Environmental Health, Division of Laboratory Sciences, 4770 Buford Hwy. N.E., Atlanta, GA 30341, USA.
authors.forename: Suzanne R
authors.initials: SR
authors.lastname: Kalb
authors.forename: Jakub
authors.initials: J
authors.lastname: Baudys
authors.forename: Christina
authors.initials: C
authors.lastname: Egan
authors.forename: Theresa J
authors.initials: TJ
authors.lastname: Smith
authors.forename: Leonard A
authors.initials: LA
authors.lastname: Smith
authors.forename: James L
authors.initials: JL
authors.lastname: Pirkle
authors.forename: John R
authors.initials: JR
authors.lastname: Barr
mesh_terms: D000595:Amino Acid Sequence; D001426:Bacterial Proteins / Q000378:metabolism*; D001483:Base Sequence; D001905:Botulinum Toxins / Q000378:metabolism*; D003013:Clostridium / Q000235:genetics* / Q000378:metabolism*; D047971:Clostridium botulinum type F / Q000235:genetics / Q000378:metabolism; D050600:SNARE Proteins / Q000235:genetics / Q000378:metabolism; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013379:Substrate Specificity; D050988:Vesicle-Associated Membrane Protein 2 / Q000737:chemistry / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; C081095:Clostridium barati F toxin; D050600:SNARE Proteins; D050988:Vesicle-Associated Membrane Protein 2; D001905:Botulinum Toxins; C096321:botulinum toxin type F