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2015 ; 209
(5
): 705-20
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Live imaging and modeling of inner nuclear membrane targeting reveals its
molecular requirements in mammalian cells
#MMPMID26056140
Boni A
; Politi AZ
; Strnad P
; Xiang W
; Hossain MJ
; Ellenberg J
J Cell Biol
2015[Jun]; 209
(5
): 705-20
PMID26056140
show ga
Targeting of inner nuclear membrane (INM) proteins is essential for nuclear
architecture and function, yet its mechanism remains poorly understood. Here, we
established a new reporter that allows real-time imaging of membrane protein
transport from the ER to the INM using Lamin B receptor and Lap2? as model INM
proteins. These reporters allowed us to characterize the kinetics of INM
targeting and establish a mathematical model of this process and enabled us to
probe its molecular requirements in an RNA interference screen of 96 candidate
genes. Modeling of the phenotypes of genes involved in transport of these INM
proteins predicted that it critically depended on the number and permeability of
nuclear pores and the availability of nuclear binding sites, but was unaffected
by depletion of most transport receptors. These predictions were confirmed with
targeted validation experiments on the functional requirements of nucleoporins
and nuclear lamins. Collectively, our data support a diffusion retention model of
INM protein transport in mammalian cells.