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J. Biol. Chem., Vol. 279, Issue 51, 53625-53634, December 17, 2004

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A Dileucine Motif and a Cluster of Acidic Amino Acids in the Second Cytoplasmic Domain of the Batten Disease-related CLN3 Protein Are Required for Efficient Lysosomal Targeting^*

Stephan Storch, Sandra Pohl, and Thomas Braulke

From the Department of Biochemistry, Children's Hospital, University of Hamburg, D-20246 Hamburg, Germany

The juvenile form of ceroid lipofuscinosis (Batten disease) is a neurodegenerative lysosomal storage disorder caused by mutations in the CLN3 gene. CLN3 encodes a multimembrane-spanning protein of unknown function, which is mainly localized in lysosomes in non-neuronal cells and in endosomes in neuronal cells. For this study we constructed chimeric proteins of three CLN3 cytoplasmic domains fused to the lumenal and transmembrane domains of the reporter proteins LAMP-1 and lysosomal acid phosphatase to identify lysosomal targeting motifs and to determine the intracellular transport and subcellular localization of the chimera in transfected cell lines. We report that a novel type of dileucine-based sorting motif, EEEX₈LI, present in the second cytoplasmic domain of CLN3, is sufficient for proper targeting to lysosomes. The first cytoplasmic domain of CLN3 and the mutation of the dileucine motif resulted in a partial missorting of chimeric proteins to the plasma membrane. At equilibrium, 4-13% of the different chimera are present at the cell surface. Analysis of lysosome-specific proteolytic processing revealed that lysosomal acid phosphatase chimera containing the second cytoplasmic domain of CLN3 showed the highest rate of lysosomal delivery, whereas the C terminus of CLN3 was found to be less efficient in lysosomal targeting. However, none of these cytosolic CLN3 domains was able to interact with AP-1, AP-3, or GGA3 adaptor complexes. These data revealed that lysosomal sorting motifs located in an intramolecular cytoplasmic domain of a multimembrane-spanning protein have different structural requirements for adaptor binding than sorting signals found in the C-terminal cytoplasmic domains of single- or dual-spanning lysosomal membrane proteins.

Received for publication, September 22, 2004

^* This work was supported by the Deutsche Forschungsgemeinschaft Grant BR 990/10-2 and the NCL Foundation, Germany. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

To whom correspondence should be addressed: Children's Hospital, Dept. of Biochemistry, University Hospital of Hamburg, Martinistr. 52, Bldg. W 23, 20246 Hamburg, Germany. Tel.: 49-40-42803-4493; Fax: 49-40-42803-8504; E-mail: braulke{at}uke.uni-hamburg.de.

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