当前位置： SCI文献检索 > MOLECULAR CELL期刊下所有文献 > The ER-Localized Transmembrane Protein TMEM39A/SUSR2 Regulates Autophagy by Controlling the Trafficking of the PtdIns(4)P Phosphatase SAC1.

The ER-Localized Transmembrane Protein TMEM39A/SUSR2 Regulates Autophagy by Controlling the Trafficking of the PtdIns(4)P Phosphatase SAC1.

Abstract：

:TMEM39A, encoding an ER-localized transmembrane protein, is a susceptibility locus for multiple autoimmune diseases. The molecular function of TMEM39A remains completely unknown. Here we demonstrated that TMEM39A, also called SUSR2, modulates autophagy activity by regulating the spatial distribution and levels of PtdIns(4)P. Depletion of SUSR2 elevates late endosomal/lysosomal PtdIns(4)P levels, facilitating recruitment of the HOPS complex to promote assembly of the SNARE complex for autophagosome maturation. SUSR2 knockdown also increases the degradative capability of lysosomes. Mechanistically, SUSR2 interacts with the ER-localized PtdIns(4)P phosphatase SAC1 and also the COPII SEC23/SEC24 subunits to promote the ER-to-Golgi transport of SAC1. Retention of SAC1 on the ER in SUSR2 knockdown cells increases the level of PtdIns(3)P produced by the VPS34 complex, promoting autophagosome formation. Our study reveals that TMEM39A/SUSR2 acts as an adaptor protein for efficient export of SAC1 from the ER and provides insights into the pathogenesis of diseases associated with TMEM39A mutations.

journal_name

Mol Cell

journal_title

Molecular cell

authors

Miao G,Zhang Y,Chen D,Zhang H

doi

10.1016/j.molcel.2019.10.035

subject

Has Abstract

pub_date

2020-02-06 00:00:00

pages

618-632.e5

issue

3

eissn

1097-2765

issn

1097-4164

pii

S1097-2765(19)30813-5

journal_volume

77

pub_type

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