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Nagano, Fumiko; Orita, Satoshi; Sasaki, Takuya; Naito, Akira; Sakaguchi, Gaku; Maeda, Miki; Watanabe, Tsuyoshi; Kominami, Eiki; Uchiyama, Yasuo; Takai, Yoshimi
Journal of biological chemistry/The Journal of biological chemistry, 11/1998, Letnik: 273, Številka: 46Journal Article
Doc2 has one Munc13-interacting domain at the N-terminal region and two C2-like domains interacting with Ca2+ and phospholipid at the C-terminal region. Doc2 consists of two isoforms, Doc2α and -β. Doc2α is specifically expressed in neuronal cells and implicated in Ca2+-dependent neurotransmitter release, whereas Doc2β is ubiquitously expressed and its function is unknown. We show here that both Doc2α and -β interact with rat tctex-1, a light chain of cytoplasmic dynein, in both cell-free and intact cell systems. Overexpression of the N-terminal fragment of Doc2 containing the tctex-1-interacting domain induces changes in the intracellular localization of cation-independent mannose 6-phosphate receptor and its ligand, cathepsin D, which are transported from trans-Golgi network to late endosomes. Overexpression of the C-terminal fragment containing two C2-like domains shows the similar effect, but to a lesser extent, whereas overexpression of full-length Doc2 or the C-terminal fragment of rabphilin3 containing two C2-like domains does not show this effect. Because dynein is a minus-end-directed microtubule-based motor protein, these results suggest that Doc2, especially Doc2β, plays a role in dynein-dependent intracellular vesicle transport.
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