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J Neurochem. 2017 Oct;143(2):236-243. doi: 10.1111/jnc.14110. Epub 2017 Aug 4.

The interaction between progranulin and prosaposin is mediated by granulins and the linker region between saposin B and C.

Author information

1
Department of Molecular Biology and Genetics, Weill Institute for Cell and Molecular Biology, Cornell University, Ithaca, New York, USA.

Abstract

The frontotemporal lobar degeneration (FTLD) protein progranulin (PGRN) is essential for proper lysosomal function. PGRN localizes in the lysosomal compartment within the cell. Prosaposin (PSAP), the precursor of lysosomal saposin activators (saposin A, B, C, D), physically interacts with PGRN. Previously, we have shown that PGRN and PSAP facilitate each other's lysosomal trafficking. Here, we report that the interaction between PSAP and PGRN requires the linker region of saposin B and C (BC linker). PSAP protein with the BC linker mutated, fails to interact with PGRN and deliver PGRN to lysosomes in the biosynthetic and endocytic pathways. On the other hand, PGRN interacts with PSAP through multiple granulin motifs. Granulin D and E bind to PSAP with similar affinity as full-length PGRN. Read the Editorial Comment for this article on page 154.

KEYWORDS:

frontotemporal lobar degeneration; lysosomal storage diseases; lysosome; neuronal ceroid lipofuscinosis; progranulin; prosaposin

PMID:
28640985
PMCID:
PMC5630500
DOI:
10.1111/jnc.14110
[Indexed for MEDLINE]
Free PMC Article

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