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2015 ; 14
(9
): 2493-509
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Cytoskeletal Components Define Protein Location to Membrane Microdomains
#MMPMID26091700
Szymanski WG
; Zauber H
; Erban A
; Gorka M
; Wu XN
; Schulze WX
Mol Cell Proteomics
2015[Sep]; 14
(9
): 2493-509
PMID26091700
show ga
The plasma membrane is an important compartment that undergoes dynamic changes in
composition upon external or internal stimuli. The dynamic subcompartmentation of
proteins in ordered low-density (DRM) and disordered high-density (DSM) membrane
phases is hypothesized to require interactions with cytoskeletal components.
Here, we systematically analyzed the effects of actin or tubulin disruption on
the distribution of proteins between membrane density phases. We used a proteomic
screen to identify candidate proteins with altered submembrane location, followed
by biochemical or cell biological characterization in Arabidopsis thaliana. We
found that several proteins, such as plasma membrane ATPases, receptor kinases,
or remorins resulted in a differential distribution between membrane density
phases upon cytoskeletal disruption. Moreover, in most cases, contrasting effects
were observed: Disruption of actin filaments largely led to a redistribution of
proteins from DRM to DSM membrane fractions while disruption of tubulins resulted
in general depletion of proteins from the membranes. We conclude that actin
filaments are necessary for dynamic movement of proteins between different
membrane phases and that microtubules are not necessarily important for formation
of microdomains as such, but rather they may control the protein amount present
in the membrane phases.