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• W4318305981 abstract "Abstract The endoplasmic reticulum’s (ER) structure is directly linked to the many functions of the ER but its formation is not fully understood. We investigate how the ER-membrane curving protein reticulon 4 (Rtn4) localizes to and organizes in the membrane and how that affects local ER structure. We show a strong correlation between the local Rtn4 density and the local ER membrane curvature. Our data further reveal that the typical ER tubule possesses an elliptical cross-section with Rtn4 enriched at either end of the major axis. Rtn4 oligomers are linear-shaped, contain about five copies of the protein, and preferentially orient parallel to the tubule axis. Our observations support a mechanism in which oligomerization leads to an increase of the local Rtn4 concentration with each molecule increasing membrane curvature through a hairpin wedging mechanism. This quantitative analysis of Rtn4 and its effects on the ER membrane result in a new model of tubule shape as it relates to Rtn4. Summary Rtn4 forms linear-shaped oligomers that contain an average of five Rtn4 proteins, localize to the sides of elliptical tubules, prefer orientations near parallel to the tubule axis, and increase local curvature of the ER membrane by increasing local Rtn4 density." @default.
• W4318305981 created "2023-01-28" @default.
• W4318305981 creator A5015081499 @default.
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• W4318305981 date "2023-01-27" @default.
• W4318305981 modified "2023-10-16" @default.
• W4318305981 title "The nanoscale organization of reticulon 4 shapes local endoplasmic reticulum structure<i>in situ</i>" @default.
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• W4318305981 doi "https://doi.org/10.1101/2023.01.26.525608" @default.
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• W4318305981 hasPublicationYear "2023" @default.
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