Efficient progranulin exit from the ER requires its interaction with prosaposin, a Surf4 cargo.
Efficient progranulin exit from the ER requires its interaction with prosaposin, a Surf4 cargo.
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DOI:
10.1083/jcb.202104044
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发表时间:
2022-02-07
期刊:
影响因子:
--
通讯作者:
Ferguson SM
中科院分区:
文献类型:
--
作者:
Devireddy S;Ferguson SM
This study establishes that efficient delivery of progranulin and prosaposin to lysosomes is regulated at the level of exit from the ER via an interaction between prosaposin and Surf4. It thus provides new insight into ER-to-Golgi trafficking of two lysosomal proteins, with neurodegenerative disease relevance. Progranulin is a lysosomal protein whose haploinsufficiency causes frontotemporal dementia, while homozygous loss of progranulin causes neuronal ceroid lipofuscinosis, a lysosomal storage disease. The sensitivity of cells to progranulin deficiency raises important questions about how cells coordinate intracellular trafficking of progranulin to ensure its efficient delivery to lysosomes. In this study, we discover that progranulin interactions with prosaposin, another lysosomal protein, first occur within the lumen of the endoplasmic reticulum (ER) and are required for the efficient ER exit of progranulin. Mechanistically, we identify an interaction between prosaposin and Surf4, a receptor that promotes loading of lumenal cargos into COPII-coated vesicles, and establish that Surf4 is critical for the efficient export of progranulin and prosaposin from the ER. Collectively, this work demonstrates that a network of interactions occurring early in the secretory pathway promote the ER exit and subsequent lysosomal delivery of newly translated progranulin and prosaposin.
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