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2016 ; 27
(13
): 2119-32
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A time course of orchestrated endophilin action in sensing, bending, and
stabilizing curved membranes
#MMPMID27170174
Poudel KR
; Dong Y
; Yu H
; Su A
; Ho T
; Liu Y
; Schulten K
; Bai J
Mol Biol Cell
2016[Jul]; 27
(13
): 2119-32
PMID27170174
show ga
Numerous proteins act in concert to sculpt membrane compartments for cell
signaling and metabolism. These proteins may act as curvature sensors, membrane
benders, and scaffolding molecules. Here we show that endophilin, a critical
protein for rapid endocytosis, quickly transforms from a curvature sensor into an
active bender upon membrane association. We find that local membrane deformation
does not occur until endophilin inserts its amphipathic helices into lipid
bilayers, supporting an active bending mechanism through wedging. Our time-course
studies show that endophilin continues to drive membrane changes on a
seconds-to-minutes time scale, indicating that the duration of endocytosis events
constrains the mode of endophilin action. Finally, we find a requirement of
coordinated activities between wedging and scaffolding for endophilin to produce
stable membrane tubules in vitro and to promote synaptic activity in vivo.
Together these data demonstrate that endophilin is a multifaceted molecule that
precisely integrates activities of sensing, bending, and stabilizing curvature to
sculpt membranes with speed.
|Adaptor Proteins, Signal Transducing/*genetics/*metabolism/physiology
[MESH]