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• W2091715186 abstract "Ricin is a potent plant cytotoxin composed of an A-chain [RTA (ricin A-chain)] connected by a disulfide bond to a cell binding lectin B-chain [RTB (ricin B-chain)]. After endocytic uptake, the toxin is transported retrogradely to the ER (endoplasmic reticulum) from where enzymatically active RTA is translocated to the cytosol. This transport is promoted by the EDEM1 (ER degradation-enhancing α-mannosidase I-like protein 1), which is also responsible for directing aberrant proteins for ERAD (ER-associated protein degradation). RTA contains a 12-residue hydrophobic C-terminal region that becomes exposed after reduction of ricin in the ER. This region, especially Pro250, plays a crucial role in ricin cytotoxicity. In the present study, we introduced a point mutation [P250A (substitution of Pro250 with alanine)] in the hydrophobic region of RTA to study the intracellular transport of the modified toxin. The introduced mutation alters the secondary structure of RTA into a more helical structure. Mutation P250A increases endosomal–lysosomal degradation of the toxin, as well as reducing its transport from the ER to the cytosol. Transport of modified RTA to the cytosol, in contrast to wild-type RTA, appears to be EDEM1-independent. Importantly, the interaction between EDEM1 and RTAP250A is reduced. This is the first reported evidence that EDEM1 protein recognition might be determined by the structure of the ERAD substrate." @default.
• W2091715186 created "2016-06-24" @default.
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• W2091715186 date "2011-05-13" @default.
• W2091715186 modified "2023-10-03" @default.
• W2091715186 title "A single point mutation in ricin A-chain increases toxin degradation and inhibits EDEM1-dependent ER retrotranslocation" @default.
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• W2091715186 doi "https://doi.org/10.1042/bj20101493" @default.
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