title: Determinants of pH-dependent modulation of translocation in dermonecrotic G-protein-deamidating toxins.
abstract: Cytotoxic necrotizing factors from E. coli (CNF1, CNF2) and Yersinia (CNFy)share N-terminal sequence similarity with Pasteurella multocida toxin (PMT). This common N-terminal region harbors the receptor-binding and translocation domains that mediate uptake and delivery of the C-terminal catalytic cargo domains into the host cytosol. Subtle variations in the N-terminal ~500 amino acids of CNFs and PMT could allow for selective recognition of cellular receptors and thus, selective target cell specificity. Through studies with cellular inhibitors, we have identified an additional novel function for this region in modulating responses of these toxin proteins to changes in pH during intoxication and delivery of the catalytic cargo domain into the cytosol.
authors.affiliation: Department of Microbiology, School of Molecular and Cell Biology, University of Illinois atUrbana-Champaign, Urbana, IL 61801, USA. repella@illinois.edu
authors.forename: Tana L
authors.initials: TL
authors.lastname: Repella
authors.forename: Mengfei
authors.initials: M
authors.lastname: Ho
authors.forename: Brenda A
authors.initials: BA
authors.lastname: Wilson
mesh_terms: D000643:Ammonium Chloride / Q000494:pharmacology; D001427:Bacterial Toxins / Q000235:genetics / Q000378:metabolism / Q000633:toxicity*; D015638:Cytochalasin D / Q000494:pharmacology; D003603:Cytotoxins / Q000235:genetics / Q000378:metabolism / Q000633:toxicity*; D029968:Escherichia coli Proteins / Q000235:genetics / Q000378:metabolism / Q000633:toxicity*; D019204:GTP-Binding Proteins / Q000378:metabolism; D057809:HEK293 Cells; D006801:Humans; D006863:Hydrogen-Ion Concentration; D018942:Macrolides / Q000494:pharmacology; D008985:Monensin / Q000494:pharmacology; D009550:Nigericin / Q000494:pharmacology; D015739:Nocodazole / Q000494:pharmacology; D021381:Protein Transport; D006180:Proton-Translocating ATPases / Q000037:antagonists & inhibitors; D011994:Recombinant Proteins / Q000633:toxicity
chemical_list: D001427:Bacterial Toxins; D003603:Cytotoxins; D029968:Escherichia coli Proteins; D018942:Macrolides; D011994:Recombinant Proteins; C086995:cytotoxic necrotizing factor type 2; D000643:Ammonium Chloride; C060296:cytotoxic necrotizing factor type 1; D015638:Cytochalasin D; C040929:bafilomycin A1; D008985:Monensin; D019204:GTP-Binding Proteins; D006180:Proton-Translocating ATPases; D009550:Nigericin; D015739:Nocodazole