FMNL2 and -3 regulate Golgi architecture and anterograde transport downstream of Cdc42.

Abstract:

:The Rho-family small GTPase Cdc42 localizes at plasma membrane and Golgi complex and aside from protrusion and migration operates in vesicle trafficking, endo- and exocytosis as well as establishment and/or maintenance of cell polarity. The formin family members FMNL2 and -3 are actin assembly factors established to regulate cell edge protrusion during migration and invasion. Here we report these formins to additionally accumulate and function at the Golgi apparatus. As opposed to lamellipodia, Golgi targeting of these proteins required both their N-terminal myristoylation and the interaction with Cdc42. Moreover, Golgi association of FMNL2 or -3 induced a phalloidin-detectable actin meshwork around the Golgi. Importantly, functional interference with FMNL2/3 formins by RNAi or CRISPR/Cas9-mediated gene deletion invariably induced Golgi fragmentation in different cell lines. Furthermore, absence of these proteins led to enlargement of endosomes as well as defective maturation and/or sorting into late endosomes and lysosomes. In line with Cdc42 - recently established to regulate anterograde transport through the Golgi by cargo sorting and carrier formation - FMNL2/3 depletion also affected anterograde trafficking of VSV-G from the Golgi to the plasma membrane. Our data thus link FMNL2/3 formins to actin assembly-dependent functions of Cdc42 in anterograde transport through the Golgi apparatus.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Kage F,Steffen A,Ellinger A,Ranftler C,Gehre C,Brakebusch C,Pavelka M,Stradal T,Rottner K

doi

10.1038/s41598-017-09952-1

subject

Has Abstract

pub_date

2017-08-29 00:00:00

pages

9791

issue

1

issn

2045-2322

pii

10.1038/s41598-017-09952-1

journal_volume

7

pub_type

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