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2016 ; 27
(1
): 75-89
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A complex of Rab13 with MICAL-L2 and ?-actinin-4 is essential for
insulin-dependent GLUT4 exocytosis
#MMPMID26538022
Sun Y
; Jaldin-Fincati J
; Liu Z
; Bilan PJ
; Klip A
Mol Biol Cell
2016[Jan]; 27
(1
): 75-89
PMID26538022
show ga
Insulin promotes glucose uptake into skeletal muscle through recruitment of
glucose transporter 4 (GLUT4) to the plasma membrane. Rab GTPases are molecular
switches mobilizing intracellular vesicles, and Rab13 is necessary for
insulin-regulated GLUT4-vesicle exocytic translocation in muscle cells. We show
that Rab13 engages the scaffold protein MICAL-L2 in this process. RNA
interference-mediated knockdown of MICAL-L2 or truncated MICAL-L2 (MICAL-L2-CT)
impaired insulin-stimulated GLUT4 translocation. Insulin increased Rab13 binding
to MICAL-L2, assessed by pull down and colocalization under confocal fluorescence
and structured illumination microscopies. Association was also visualized at the
cell periphery using TIRF microscopy. Insulin further increased binding of
MICAL-L2 to ?-actinin-4 (ACTN4), a protein involved in GLUT4 translocation.
Rab13, MICAL-L2, and ACTN4 formed an insulin-dependent complex assessed by pull
down and confocal fluorescence imaging. Of note, GLUT4 associated with the
complex in response to insulin, requiring the ACTN4-binding domain in MICAL-L2.
This was demonstrated by pull down with distinct fragments of MICAL-L2 and
confocal and structured illumination microscopies. Finally, expression of
MICAL-L2-CT abrogated the insulin-dependent colocalization of Rab13 with ACTN4 or
Rab13 with GLUT4. Our findings suggest that MICAL-L2 is an effector of
insulin-activated Rab13, which links to GLUT4 through ACTN4, localizing GLUT4
vesicles at the muscle cell periphery to enable their fusion with the membrane.