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Glucose on the sugar side chains of proteins keeps unfolded proteins in the ER. Mannoses on sugar side chains act as a timer for protein folding. Unfolded proteins in the ER are threaded through a retrotranslocon into the cytosol where they are ubiquitylated and digested. IRE1, ATF6 and PERK sense the amount of unfolded protein and generates several responses to reduce the effects and amount of unfolded protein.
An example of the Rossmann fold, a structural domain of a decarboxylase protein from the bacterium Staphylococcus epidermidis (PDB ID 1G5Q) with the bound flavin mononucleotide cofactor shown.n 1989, Israel Hanukoglu from the Weizmann Institute of Science discovered that the consensus sequence for NADP binding site in some enzymes that utilize NADP differs from the NAD binding motif. This discovery was used to re-engineer coenzyme specificities of enzymes.