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- W2897545365 abstract "Extensive mannose trimming of nascent glycoprotein N-glycans signals their targeting to endoplasmic reticulum-associated degradation (ERAD). ER mannosidase I (ERManI) and the EDEM protein family participate in this process. However, whether the EDEMs are truly mannosidases can be addressed only by measuring mannosidase activity in vitro. Here, we reveal EDEM1 and EDEM2 mannosidase activities in vitro. Whereas ERManI significantly trims free N-glycans, activity of the EDEMs is modest on free oligosaccharides and on glycoproteins. However, mannosidase activity of ERManI and the EDEMs is significantly higher on a denatured glycoprotein. The EDEMs associate with oxidoreductases, protein disulfide isomerase, and especially TXNDC11, enhancing mannosidase activity on glycoproteins but not on free N-glycans. The finding that substrate unfolded status increases mannosidase activity solves an important conundrum, as current models suggest general slow mannose trimming. As we show, misfolded or unfolded glycoproteins are subject to differentially faster trimming (and targeting to ERAD) than well-folded ones." @default.
- W2897545365 created "2018-10-26" @default.
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- W2897545365 date "2018-10-18" @default.
- W2897545365 modified "2023-10-12" @default.
- W2897545365 title "Mannosidase activity of EDEM1 and EDEM2 depends on an unfolded state of their glycoprotein substrates" @default.
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- W2897545365 doi "https://doi.org/10.1038/s42003-018-0174-8" @default.
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