This entry includes insecticidal protein Cry1Ac from Bacillus thuringiensis, which contains a proteolytically labile protoxin segment (in the C-terminal region) and a three-domain toxic core at the N terminus (domains I-III) [1]. The protoxin segment ...
This entry includes insecticidal protein Cry1Ac from Bacillus thuringiensis, which contains a proteolytically labile protoxin segment (in the C-terminal region) and a three-domain toxic core at the N terminus (domains I-III) [1]. The protoxin segment consists of domains IV-VII. This entry represents domain VII, which is a beta-roll that closely resembles carbohydrate-binding modules.
This family contains insecticidal toxins produced by Bacillus species of bacteria. During spore formation the bacteria produce crystals of this protein. When an insect ingests these proteins they are activated by proteolytic cleavage. The N termin ...
This family contains insecticidal toxins produced by Bacillus species of bacteria. During spore formation the bacteria produce crystals of this protein. When an insect ingests these proteins they are activated by proteolytic cleavage. The N terminus is cleaved in all of the proteins and a C terminal extension is cleaved in some members. Once activated the endotoxin binds to the gut epithelium and causes cell lysis leading to death. This activated region of the delta endotoxin is composed of three structural domains. The N-terminal helical domain is involved in membrane insertion and pore formation. The second and third domains are involved in receptor binding.
This family contains insecticidal toxins produced by Bacillus species of bacteria. During spore formation the bacteria produce crystals of this protein. When an insect ingests these proteins they are activated by proteolytic cleavage. The N termin ...
This family contains insecticidal toxins produced by Bacillus species of bacteria. During spore formation the bacteria produce crystals of this protein. When an insect ingests these proteins they are activated by proteolytic cleavage. The N terminus is cleaved in all of the proteins and a C terminal extension is cleaved in some members. Once activated the endotoxin binds to the gut epithelium and causes cell lysis leading to death. This activated region of the delta endotoxin is composed of three structural domains. The N-terminal helical domain is involved in membrane insertion and pore formation. The second and third domains are involved in receptor binding.
This domain is found in the protoxins portion of insecticidal proteins (parasporins, or Cry proteins) such as those from Bacillus thuringiensis (Bt) Cry1Ac. The protoxin portion comprise a proteolytically labile C-terminal segment (sometimes referred ...
This domain is found in the protoxins portion of insecticidal proteins (parasporins, or Cry proteins) such as those from Bacillus thuringiensis (Bt) Cry1Ac. The protoxin portion comprise a proteolytically labile C-terminal segment (sometimes referred to as the protoxin domain). This is domain V in Cry1Ac from B. thuringiensis. One of the four protoxin domains (D-IV through D-VII). Domains V and VII are beta-rolls (similar to D-II or D-III) that closely resemble carbohydrate-binding modules (CBM) found in sugar hydrolases, however, it is difficult to guess which particular carbohydrates (if any) may serve as their ligands because residues on the putative sugar-binding interfaces are conserved neither in sequence nor in local structure. Structural analysis indicate that there are putative disulfide crosslinking at the dimer interface mediated by cysteines within 783-823 region of this domain which together with other cysteines creates a three-dimensional network of cross-links across the crystal which may play a role in stabilizing mature Bt Cry1Ac [1].
