Abstract：
:The endoplasmic reticulum (ER) often forms stacked membrane sheets, an arrangement that is likely required to accommodate a maximum of membrane-bound polysomes for secretory protein synthesis. How sheets are stacked is unknown. Here, we used improved staining and automated ultrathin sectioning electron microscopy methods to analyze stacked ER sheets in neuronal cells and secretory salivary gland cells of mice. Our results show that stacked ER sheets form a continuous membrane system in which the sheets are connected by twisted membrane surfaces with helical edges of left- or right-handedness. The three-dimensional structure of tightly stacked ER sheets resembles a parking garage, in which the different levels are connected by helicoidal ramps. A theoretical model explains the experimental observations and indicates that the structure corresponds to a minimum of elastic energy of sheet edges and surfaces. The structure allows the dense packing of ER sheets in the restricted space of a cell.
journal_name
Celljournal_title
Cellauthors
Terasaki M,Shemesh T,Kasthuri N,Klemm RW,Schalek R,Hayworth KJ,Hand AR,Yankova M,Huber G,Lichtman JW,Rapoport TA,Kozlov MMdoi
10.1016/j.cell.2013.06.031subject
Has Abstractpub_date
2013-07-18 00:00:00pages
285-96issue
2eissn
0092-8674issn
1097-4172pii
S0092-8674(13)00770-8journal_volume
154pub_type
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