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2016 ; 5
(ä): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Cooperation of the ER-shaping proteins atlastin, lunapark, and reticulons to
generate a tubular membrane network
#MMPMID27619977
Wang S
; Tukachinsky H
; Romano FB
; Rapoport TA
Elife
2016[Sep]; 5
(ä): ä PMID27619977
show ga
In higher eukaryotes, the endoplasmic reticulum (ER) contains a network of
membrane tubules, which transitions into sheets during mitosis. Network formation
involves curvature-stabilizing proteins, including the reticulons (Rtns), as well
as the membrane-fusing GTPase atlastin (ATL) and the lunapark protein (Lnp).
Here, we have analyzed how these proteins cooperate. ATL is needed to not only
form, but also maintain, the ER network. Maintenance requires a balance between
ATL and Rtn, as too little ATL activity or too high Rtn4a concentrations cause ER
fragmentation. Lnp only affects the abundance of three-way junctions and tubules.
We suggest a model in which ATL-mediated fusion counteracts the instability of
free tubule ends. ATL tethers and fuses tubules stabilized by the Rtns, and
transiently sits in newly formed three-way junctions. Lnp subsequently moves into
the junctional sheets and forms oligomers. Lnp is inactivated by mitotic
phosphorylation, which contributes to the tubule-to-sheet conversion of the ER.