Journal of Proteomics & Bioinformatics
Open Access
ISSN: 0974-276X
ISSN: 0974-276X
Li Liu
Russia
Research Article
Interaction of Fluorescently Labeled Cadherin G Protein-coupled Receptor with the Cry1Ab Toxin of Bacillus thuringiensis
Author(s): Li Liu, Stefanie Boyd, Mehraban Kavoussi, Lee A Bulla Jr. and Duane D Winkler
Li Liu, Stefanie Boyd, Mehraban Kavoussi, Lee A Bulla Jr. and Duane D Winkler
The Cry1Ab toxin produced by Bacillus thuringiensis binds to a conserved structural motif in the 12th ectodomain module (EC12) of BT-R1, a cadherin G protein-coupled receptor (GPCR) contained in the membrane of midgut epithelial cells of the tobacco hornworm Manduca sexta. Toxin binding transmits a signal into the cells and turns on a multi-step signal transduction pathway, culminating in cell death. Using chromatographically purified Cry1Ab and EC12 proteins, we demonstrated the direct formation of a stable complex between these two proteins in solution and visualized it on a native polyacrylamide gel. Moreover, we generated a fluorescent EC12 probe by converting the 36th residue to cysteine to enable maleimide-mediated conjugation of Alexa-488 fluorescent dye to EC12 by site-directed mutagenesis. In addition, we changed the 44th residue of EC12 to tryptophan, which.. View More»
DOI:
10.4172/jpb.1000474