How lamina-associated polypeptide 1 (LAP1) activates Torsin.

Abstract:

:Lamina-associated polypeptide 1 (LAP1) resides at the nuclear envelope and interacts with Torsins, poorly understood endoplasmic reticulum (ER)-localized AAA+ ATPases, through a conserved, perinuclear domain. We determined the crystal structure of the perinuclear domain of human LAP1. LAP1 possesses an atypical AAA+ fold. While LAP1 lacks canonical nucleotide binding motifs, its strictly conserved arginine 563 is positioned exactly where the arginine finger of canonical AAA+ ATPases is found. Based on modeling and electron microscopic analysis, we propose that LAP1 targets Torsin to the nuclear envelope by forming an alternating, heterohexameric (LAP1-Torsin)3 ring, in which LAP1 acts as the Torsin activator. The experimental data show that mutation of arginine 563 in LAP1 reduces its ability to stimulate TorsinA ATPase hydrolysis. This knowledge may help scientists understand the etiology of DYT1 primary dystonia, a movement disorder caused by a single glutamate deletion in TorsinA.

journal_name

Elife

journal_title

eLife

authors

Sosa BA,Demircioglu FE,Chen JZ,Ingram J,Ploegh HL,Schwartz TU

doi

10.7554/eLife.03239

subject

Has Abstract

pub_date

2014-08-22 00:00:00

pages

e03239

issn

2050-084X

journal_volume

3

pub_type

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