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Published on: July 22, 2019
Characterization of an anti-FLAG antibody binding protein in V. cholerae
Jung-Ho Shin1, Michael Lanz2, Marcus B Smolka2
1Weill Institute for Cell and Molecular Biology, Cornell, University, Ithaca, NY, 14853, USA; Department of Microbiology, Cornell University, Ithaca, NY, 14853, USA.
Abstract:
FLAG-tags are commonly used for protein abundance measurements and for identification of protein-protein interactions in living cells. We have observed that the cholera pathogen Vibrio cholerae encodes a FLAG-antibody-reactive protein and identified this protein as an outer membrane porin, Porin4, which contains a sequence very similar to the 3xFLAG epitope tag. We have demonstrated the binding affinity of the conserved peptide sequence (called Porin 4 tag) in Porin4 against monoclonal anti-FLAG M2 antibody. In addition, we created a porin4 deletion mutant, which can be used for background-less FLAG antibody detection experiments.
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