Download MendeleyInsights from the Structure of an Active Form of Bacillus thuringiensis Cry5B.
Li, J., Wang, L., Kotaka, M., Lee, M.M., Chan, M.K.(2022) Toxins (Basel) 14
- PubMed: 36548720
- DOI: https://doi.org/10.3390/toxins14120823
- Primary Citation of Related Structures:
8HHE - PubMed Abstract:
The crystal protein Cry5B, a pore-forming protein produced by the soil bacterium Bacillus thuringiensis , has been demonstrated to have excellent anthelmintic activity. While a previous structure of the three-domain core region of Cry5B(112-698) had been reported, this structure lacked a key N-terminal extension critical to function. Here we report the structure of Cry5B(27-698) containing this N-terminal extension. This new structure adopts a distinct quaternary structure compared to the previous Cry5B(112-698) structure, and also exhibits a change in the conformation of residues 112-140 involved in linking the N-terminal extension to the three-domain core by forming a random coil and an extended α-helix. A role for the N-terminal extension is suggested based on a computational model of the tetramer with the conformation of residues 112-140 in its alternate α-helix conformation. Finally, based on the Cry5B(27-698) structure, site-directed mutagenesis studies were performed on Tyr495, which revealed that having an aromatic group or bulky group at this residue 495 is important for Cry5B toxicity.
Organizational Affiliation:
School of Life Sciences and Center of Novel Biomaterials, The Chinese University of Hong Kong, Shatin, Hong Kong SAR 999077, China.
