Msp1 Is a Membrane Protein Dislocase for Tail-Anchored Proteins.Wohlever, M.L., Mateja, A., McGilvray, P.T., Day, K.J., Keenan, R.J.
(2017) Mol. Cell 67: 194-202.e6
- PubMed: 28712723
- DOI: 10.1016/j.molcel.2017.06.019
- PubMed Abstract:
- The conserved AAA-ATPase Msp1 confers organelle specificity to tail-anchored proteins.
Okreglak, V.,Walter, P.
(2014) Proc. Natl. Acad. Sci. U.S.A. 111: 8019
- Msp1/ATAD1 maintains mitochondrial function by facilitating the degradation of mislocalized tail-anchored proteins.
Chen, Y.C.,Umanah, G.K.,Dephoure, N.,Andrabi, S.A.,Gygi, S.P.,Dawson, T.M.,Dawson, V.L.,Rutter, J.
(2014) EMBO J. 33: 1548
- The AAA+ ATPase Thorase regulates AMPA receptor-dependent synaptic plasticity and behavior.
Zhang, J.,Wang, Y.,Chi, Z.,Keuss, M.J.,Pai, Y.M.,Kang, H.C.,Shin, J.H.,Bugayenko, A.,Wang, H.,Xiong, Y.,Pletnikov, M.V.,Mattson, M.P.,Dawson, T.M.,Dawson, V.L.
(2011) Cell 145: 284
Mislocalized tail-anchored (TA) proteins of the outer mitochondrial membrane are cleared by a newly identified quality control pathway involving the conserved eukaryotic protein Msp1 (ATAD1 in humans). Msp1 is a transmembrane AAA-ATPase, but its role ...
Mislocalized tail-anchored (TA) proteins of the outer mitochondrial membrane are cleared by a newly identified quality control pathway involving the conserved eukaryotic protein Msp1 (ATAD1 in humans). Msp1 is a transmembrane AAA-ATPase, but its role in TA protein clearance is not known. Here, using purified components reconstituted into proteoliposomes, we show that Msp1 is both necessary and sufficient to drive the ATP-dependent extraction of TA proteins from the membrane. A crystal structure of the Msp1 cytosolic region modeled into a ring hexamer suggests that active Msp1 contains a conserved membrane-facing surface adjacent to a central pore. Structure-guided mutagenesis of the pore residues shows that they are critical for TA protein extraction in vitro and for functional complementation of an msp1 deletion in yeast. Together, these data provide a molecular framework for Msp1-dependent extraction of mislocalized TA proteins from the outer mitochondrial membrane.
Department of Biochemistry and Molecular Biology, The University of Chicago, 929 East 57th Street, Chicago, IL 60637, USA.