CLN5 is cleaved by members of the SPP/SPPL family to produce a mature soluble protein.

Abstract : The Neuronal ceroid lipofuscinoses (NCLs) are a group of recessive disorders of childhood with overlapping symptoms including vision loss, ataxia, cognitive regression and premature death. 14 different genes have been linked to NCLs (CLN1-CLN14), but the functions of the proteins encoded by the majority of these genes have not been fully elucidated. Mutations in the CLN5 gene are responsible for the Finnish variant late-infantile form of NCL (Finnish vLINCL). CLN5 is translated as a 407 amino acid transmembrane domain containing protein that is heavily glycosylated, and subsequently cleaved into a mature soluble protein. Functionally, CLN5 is implicated in the recruitment of the retromer complex to endosomes, which is required to sort the lysosomal sorting receptors from endosomes to the trans-Golgi network. The mechanism that processes CLN5 into a mature soluble protein is currently not known. Herein, we demonstrate that CLN5 is initially translated as a type II transmembrane protein and subsequently cleaved by SPPL3, a member of the SPP/SPPL intramembrane protease family, into a mature soluble protein consisting of residues 93-407. The remaining N-terminal fragment is then cleaved by SPPL3 and SPPL2b and degraded in the proteasome. This work further characterizes the biology of CLN5 in the hopes of identifying a novel therapeutic strategy for affected children.
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Submitted on : Wednesday, June 7, 2017 - 8:38:22 PM
Last modification on : Thursday, February 7, 2019 - 3:10:19 PM

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Felix Jules, Etienne Sauvageau, Karine Dumaresq-Doiron, Javier Mazzaferri, Martina Haug-Kröper, et al.. CLN5 is cleaved by members of the SPP/SPPL family to produce a mature soluble protein.. Experimental Cell Research, Elsevier, 2017, ⟨10.1016/j.yexcr.2017.04.024⟩. ⟨pasteur-01534650⟩

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