ArticleBiochimica et biophysica acta2015
Structural and functional analysis of botulinum neurotoxin subunits for pH-dependent membrane channel formation and translocation.
Article in Biochimica et biophysica acta, 2015. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Who cites it
5 citing papers in PubMed, 12 citations in OpenAlex.
- Cryo-EM Structure Guided Engineering of Botulinum Neurotoxin A With Advanced Receptor Binding Affinity and Therapeutical Benefits.Advanced science (Weinheim, Baden-Wurttemberg, Germany) · 2026Article
- Clostridium botulinum serotype B: microbial genetics, toxin biosynthesis, current applications, and future prospects.Archives of microbiology · 2025Review
- Clostridial Neurotoxins: Structure, Function and Implications to Other Bacterial Toxins.Microorganisms · 2021Review
- Review
- High Yield Preparation of Functionally Active Catalytic-Translocation Domain Module of Botulinum Neurotoxin Type A That Exhibits Uniquely Different Enzyme Kinetics.The protein journal · 2017Article
Corrections and comments
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Authors and funding
6 authors at 2 institutions in 1 country.
Funding
Abstract
The structure-function relationship of Botulinum Neurotoxin (BoNT) proteins is greatly influenced by pH. While the low pH of endosome favors membrane interaction of the heavy chain (HC) for the formation of a membrane channel and translocation of the light chain (LC), the catalytic activity of the LC requires a neutral pH for cleavage of the soluble NSF attachment protein receptor (SNARE) complex in the cytosol. In this study, we monitored secondary structural characteristics of LC, HC and holotoxin at individual pHs 4.5 and 7.2 and at the transition pH4.5 to 7.2 to identify the structural signatures underlying their function. The HC showed higher thermal stability at pH4.5 with a melting temperature (Tm) of 60.4°C. The structural analysis of HC in the presence of liposomes showed no difference in ellipticity with that of HC at pH7.2 at 208 and 222 nm but a 25.2% decrease in ellipticity at 208 nm at acidic pH, indicating low pH-induced structural changes that might facilitate interaction with the membrane. Further, HC showed 18% release of K+ ions from liposomes at pH4.5 as against 6% at neutral pH, reinforcing its role in membrane channel formation. LC on the other hand, showed maximum ellipticity at pH7.2, a condition that is relevant to its endopeptidase activity in the cytosol of the neurons. Also, the similarity in the structures at pH7.2 and transition pH4.5 to 7.2 suggested that the flexibility acquired by the protein at low pH was reversible upon exposure to neutral pH for cleavage of SNARE proteins.
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Registered trials
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