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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Cell+Biol
2017 ; 216
(11
): 3745-3765
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Control of actin polymerization via the coincidence of phosphoinositides and high
membrane curvature
#MMPMID28923975
Daste F
; Walrant A
; Holst MR
; Gadsby JR
; Mason J
; Lee JE
; Brook D
; Mettlen M
; Larsson E
; Lee SF
; Lundmark R
; Gallop JL
J Cell Biol
2017[Nov]; 216
(11
): 3745-3765
PMID28923975
show ga
The conditional use of actin during clathrin-mediated endocytosis in mammalian
cells suggests that the cell controls whether and how actin is used. Using a
combination of biochemical reconstitution and mammalian cell culture, we
elucidate a mechanism by which the coincidence of PI(4,5)P(2) and PI(3)P in a
curved vesicle triggers actin polymerization. At clathrin-coated pits, PI(3)P is
produced by the INPP4A hydrolysis of PI(3,4)P(2), and this is necessary for
actin-driven endocytosis. Both Cdc42?guanosine triphosphate and SNX9 activate
N-WASP-WIP- and Arp2/3-mediated actin nucleation. Membrane curvature,
PI(4,5)P(2), and PI(3)P signals are needed for SNX9 assembly via its PX-BAR
domain, whereas signaling through Cdc42 is activated by PI(4,5)P(2) alone. INPP4A
activity is stimulated by high membrane curvature and synergizes with SNX9 BAR
domain binding in a process we call curvature cascade amplification. We show that
the SNX9-driven actin comets that arise on human disease-associated
oculocerebrorenal syndrome of Lowe (OCRL) deficiencies are reduced by inhibiting
PI(3)P production, suggesting PI(3)P kinase inhibitors as a therapeutic strategy
in Lowe syndrome.
|*Endocytosis
[MESH]
|Actin-Related Protein 2-3 Complex/genetics/metabolism
[MESH]
|Actins/*metabolism
[MESH]
|Animals
[MESH]
|CRISPR-Cas Systems
[MESH]
|Clathrin-Coated Vesicles/*metabolism
[MESH]
|Clathrin/*metabolism
[MESH]
|Coated Pits, Cell-Membrane/*metabolism
[MESH]
|Cytoskeletal Proteins/genetics/metabolism
[MESH]
|HeLa Cells
[MESH]
|Humans
[MESH]
|Hydrolysis
[MESH]
|Intracellular Signaling Peptides and Proteins/genetics/metabolism
[MESH]