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& ^9 E1 \) G8 {! I8 KVolume 154, Issue 23 v- r# w6 j' Q. U. I# a
On the cover: In this issue of Cell, Terasaki et al. (pp. 285–296) ' w( \6 J! l9 }8 f- v
explain how parallel sheets of endoplasmic reticulum are connected. The
( m1 m4 k! p7 J! e Yexistence of these sheet stacks and their function in synthesis of membrane and
. Y6 E" @5 \ l1 _secreted proteins has been known for more than 60 years. Three-dimensional / |1 t" b5 Y7 C' b1 w: o
reconstructions from serial section electron micrographs from mouse salivary 2 W0 ^+ A2 ~. _) B7 i0 ~& V" r
gland show that the sheets are connected by twisted membrane surfaces with
: d8 I- C/ j% R, rhelical edges. The overall structure resembles a parking garage, in which the
5 M3 L/ a O5 G& wdifferent levels are connected by helicoidal ramps. Theoretical calculations
; I0 B4 p9 j$ ?% pshow that this structure minimizes the elastic energy of sheet edges and
4 I& u8 [$ D5 ?6 ?! {surfaces and allows dense packing of this organelle in the restricted space of a 3 Q) J$ R! c% `, K" _( L
cell.
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