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- W2951799093 abstract "In eukaryotic cells, biogenesis of proteins destined to the secretory pathway begins from the cytosol. Nascent chains are either co-translationally or post-translationally targeted to the endoplasmic reticulum (ER) and translocated across the membrane through the Sec61 complex. For the post-translational translocation, the Sec62/Sec63 complex is additionally required. Sec63, however, is also shown to mediate co-translational translocation of a subset of proteins, the types and characteristics of proteins that Sec63 mediates in translocation still await to be defined.To overview the types of proteins that require Sec63 for the ER translocation, we prepared Sec63 mutant lacking the first 39 residues (Sec63_ΔN39) in yeast and assessed initial translocation efficiencies of diverse types of precursors in the sec63_ΔN39 strain by a 5 min metabolic labeling. By employing Blue-Native gel electrophoresis (BN-PAGE), stability of the SEC complex (Sec61 plus Sec62/Sec63 complexes) isolated from cells carrying the Sec63_ΔN39 mutant was examined.Among the various translocation precursors tested, we found that proper sorting of single- and double-pass membrane proteins was severely impaired in addition to post-translational translocation precursor in the sec63_ΔN39 mutant strain. Stability of the SEC complex was compromised upon deletion of the N-terminal 39 residues.The N-terminus of Sec63 is important for stability of the SEC complex and Sec63 is required for proper sorting of membrane proteins in vivo.Sec63 is essential on insertion of membrane proteins." @default.
- W2951799093 created "2019-06-27" @default.
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- W2951799093 date "2019-09-01" @default.
- W2951799093 modified "2023-09-25" @default.
- W2951799093 title "Proper insertion and topogenesis of membrane proteins in the ER depend on Sec63" @default.
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- W2951799093 doi "https://doi.org/10.1016/j.bbagen.2019.06.005" @default.
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