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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+Sci
2016 ; 129
(8
): 1552-65
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English Wikipedia
Transmembrane protein TMEM170A is a newly discovered regulator of ER and nuclear
envelope morphogenesis in human cells
#MMPMID26906412
Christodoulou A
; Santarella-Mellwig R
; Santama N
; Mattaj IW
J Cell Sci
2016[Apr]; 129
(8
): 1552-65
PMID26906412
show ga
The mechanism of endoplasmic reticulum (ER) morphogenesis is incompletely
understood. ER tubules are shaped by the reticulons (RTNs) and DP1/Yop1p family
members, but the mechanism of ER sheet formation is much less clear. Here, we
characterize TMEM170A, a human transmembrane protein, which localizes in ER and
nuclear envelope membranes. Silencing or overexpressing TMEM170A in HeLa K cells
alters ER shape and morphology. Ultrastructural analysis reveals that
downregulation of TMEM170A specifically induces tubular ER formation, whereas
overexpression of TMEM170A induces ER sheet formation, indicating that TMEM170A
is a newly discovered ER-sheet-promoting protein. Additionally, downregulation of
TMEM170A alters nuclear shape and size, decreases the density of nuclear pore
complexes (NPCs) in the nuclear envelope and causes either a reduction in inner
nuclear membrane (INM) proteins or their relocalization to the ER. TMEM170A
interacts with RTN4, a member of the reticulon family; simultaneous co-silencing
of TMEM170A and RTN4 rescues ER, NPC and nuclear-envelope-related phenotypes,
implying that the two proteins have antagonistic effects on ER membrane
organization, and nuclear envelope and NPC formation.