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Genes to Cells (2006) 11, 593-606. doi:10.1111/j.1365-2443.2006.00963.x
© 2006 Blackwell Publishing or its licensors
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Clathrin anchors deubiquitinating enzymes, AMSH and AMSH-like protein, on early endosomes

Michihiko Nakamura1, Nobuyuki Tanaka2, Naomi Kitamura1 and Masayuki Komada1,*

1 Department of Biological Sciences, Tokyo Institute of Technology, Yokohama 226-8501, Japan
2 Department of Immunology and Microbiology, Tohoku University Graduate School of Medicine, Sendai 980-8575, Japan

Endosomal sorting of ubiquitinated membrane proteins for trafficking to lysosomes is executed by a complex of two ubiquitin-binding proteins, Hrs and STAM, that localizes on a microdomain of early endosomes with a flat clathrin coat. AMSH is a deubiquitinating enzyme that interacts with STAM and is implicated in the down-regulation of epidermal growth factor receptor. AMSH has a close homolog, AMSH-like protein (AMSH-LP). Here we show that AMSH-LP is also a deubiquitinating enzyme that acts on early endosomes. We further show that AMSH and AMSH-LP bind to the terminal domain of clathrin heavy chain via a novel clathrin-binding site conserved between these proteins. Exogenously expressed AMSH and AMSH-LP co-localized with clathrin on early endosomes. However, deletion of the clathrin-binding site from the proteins, as well as RNA interference-mediated depletion of clathrin heavy chain, resulted in a failure of AMSH and AMSH-LP to localize on endosomes. In contrast, a mutant of AMSH that lacks the ability to bind STAM localized normally on endosomes. We suggest that AMSH and AMSH-LP are anchored on the early endosomal membrane via interaction with the clathrin coat.

Communicated by: Akihiko Nakano

* Correspondence: E-mail: makomada{at}bio.titech.ac.jp




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