Abstract：
:beta-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 beta-glucocerebrosidase. This interaction involves a coiled-coil domain within the lumenal domain. beta-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 beta-glucocerebrosidase was secreted. Missorting of beta-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 beta-glucocerebrosidase levels and distribution. LIMP-2 expression also led to lysosomal transport of a beta-glucocerebrosidase endoplasmic reticulum retention mutant. These data support a role for LIMP-2 as the mannose-6-phosphate-independent trafficking receptor for beta-glucocerebrosidase.
journal_name
Celljournal_title
Cellauthors
Reczek D,Schwake M,Schröder J,Hughes H,Blanz J,Jin X,Brondyk W,Van Patten S,Edmunds T,Saftig Pdoi
10.1016/j.cell.2007.10.018subject
Has Abstractpub_date
2007-11-16 00:00:00pages
770-83issue
4eissn
0092-8674issn
1097-4172pii
S0092-8674(07)01290-1journal_volume
131pub_type
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