LIMP-2 Is a Receptor for Lysosomal Mannose-6-Phosphate-Independent Targeting of β-Glucocerebrosidase

David Reczek*, Michael Schwake, Jenny Schröder, Heather Hughes, Judith Blanz, Xiaoying Jin, William Brondyk, Scott Van Patten, Tim Edmunds, Paul Saftig

*Corresponding author for this work

Research output: Contribution to journalArticle

305 Scopus citations

Abstract

β-glucocerebrosidase, the enzyme defective in Gaucher disease, is targeted to the lysosome independently of the mannose-6-phosphate receptor. Affinity-chromatography experiments revealed that the lysosomal integral membrane protein LIMP-2 is a specific binding partner of β-glucocerebrosidase. This interaction involves a coiled-coil domain within the lumenal domain. β-glucocerebrosidase activity and protein levels were severely decreased in LIMP-2-deficient mouse tissues. Analysis of fibroblasts and macrophages isolated from these mice indicated that the majority of β-glucocerebrosidase was secreted. Missorting of β-glucocerebrosidase was also evident in vivo, as protein and activity levels were significantly higher in sera from LIMP-2-deficient mice compared to wild-type. Reconstitution of LIMP-2 in LIMP-2-deficient fibroblasts led to a rescue of β-glucocerebrosidase levels and distribution. LIMP-2 expression also led to lysosomal transport of a β-glucocerebrosidase endoplasmic reticulum retention mutant. These data support a role for LIMP-2 as the mannose-6-phosphate-independent trafficking receptor for β-glucocerebrosidase.

Original languageEnglish (US)
Pages (from-to)770-783
Number of pages14
JournalCell
Volume131
Issue number4
DOIs
StatePublished - Nov 16 2007

Keywords

  • CELLBIO
  • HUMDISEASE

ASJC Scopus subject areas

  • Cell Biology
  • Molecular Biology

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    Reczek, D., Schwake, M., Schröder, J., Hughes, H., Blanz, J., Jin, X., Brondyk, W., Van Patten, S., Edmunds, T., & Saftig, P. (2007). LIMP-2 Is a Receptor for Lysosomal Mannose-6-Phosphate-Independent Targeting of β-Glucocerebrosidase. Cell, 131(4), 770-783. https://doi.org/10.1016/j.cell.2007.10.018