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Vol. 15, Issue 12, 5712-5723, December 2004

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NVL2 Is a Nucleolar AAA-ATPase that Interacts with Ribosomal Protein L5 through Its Nucleolar Localization Sequence

Masami Nagahama, Yoshimitsu Hara, Akihiro Seki, Takeshi Yamazoe, Yumiko Kawate, Takashi Shinohara, Kiyotaka Hatsuzawa ^*, Katsuko Tani, and Mitsuo Tagaya 

School of Life Science, Tokyo University of Pharmacy and Life Science, Hachioji, Tokyo 192-0392, Japan

Submitted August 11, 2004; Revised September 28, 2004; Accepted September 29, 2004
Monitoring Editor: Joseph Gall

NVL (nuclear VCP-like protein), a member of the AAA-ATPase family, is known to exist in two forms with N-terminal extensions of different lengths in mammalian cells. Here, we show that they are localized differently in the nucleus; NVL2, the major species, is mainly present in the nucleolus, whereas NVL1 is nucleoplasmic. Mutational analysis demonstrated the presence of two nuclear localization signals in NVL2, one of which is shared with NVL1. In addition, a nucleolar localization signal was found to exist in the N-terminal extra region of NVL2. The nucleolar localization signal is critical for interaction with ribosomal protein L5, which was identified as a specific interaction partner of NVL2 on yeast two-hybrid screening. The interaction of NVL2 with L5 is ATP-dependent and likely contributes to the nucleolar translocation of NVL2. The physiological implication of this interaction was suggested by the finding that a dominant negative NVL2 mutant inhibits ribosome biosynthesis, which is known to take place in the nucleolus.

^* Present address: Institute of Biomedical Sciences, Fukushima Medical University School of Medicine, Fukushima 960-1295, Japan.

Corresponding author. E-mail address: tagaya{at}ls.toyaku.ac.jp.

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