Apr 18, 2016

Chm7 and Heh1 form a nuclear envelope subdomain for nuclear pore complex quality control

BioRxiv : the Preprint Server for Biology
Brant M WebsterC. Patrick Lusk


Mechanisms that ensure the integrity of the nuclear envelope rely on membrane remodeling proteins like the ESCRTs and the AAA ATPase Vps4, which help seal the nuclear envelope at the end of mitosis and prevent the formation of defective nuclear pore complexes (NPCs). Here, we show that the integral inner nuclear membrane proteins Heh1 and Heh2 directly bind the ESCRT-III, Snf7, and the ESCRT-II/III chimera, Chm7, in their "open" forms. Moreover, Heh1 is required for Chm7-recruitment to the nuclear envelope. As Chm7 accumulates on the nuclear envelope upon blocks to NPC assembly, but not to nuclear transport, interactions between ESCRTs and the Heh proteins might form a biochemically distinct nuclear envelope subdomain that delimits regions of assembling NPCs. Interestingly, deletion of CHM7 suppresses the formation of the storage of improperly assembled NPC compartment prevalent in vps4Δ ; strains. Thus, our data support that the Heh1-dependent recruitment of Chm7 is a key component of a quality control pathway whose local regulation by Vps4 and the transmembrane nup, Pom152, prevents loss of nuclear compartmentalization by defective NPCs.

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Mentioned in this Paper

Inner Nuclear Membrane
VPS4A protein, human
Biochemical Pathway
Nasopharyngeal Carcinoma
Adenosine Triphosphatases
Complex (molecular entity)
VPS4A gene
Nuclear Transport
Chimera Organism

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