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EB3, a novel member of the EB1 family preferentially expressed in the central nervous system, binds to a CNS-specific APC homologue

Oncogene volume 19, pages 210–216 (2000)Cite this article

Abstract

APCL, a homologue of the adenomatous polyposis coli (APC) tumor suppressor, can deplete cytoplasmic beta-catenin like APC. However, as its biological function remains unclear, we have been using a yeast two-hybrid system to search for proteins that associate with its carboxyl region. Among several cDNA clones we isolated from a fetal-brain cDNA library as candidates, six included an identical sequence with significant homology to EB1, a protein known to bind to APC. The full-length cDNA of this novel homologue of EB1, named EB3, encoded a protein of 282 amino acids with 54% identity to EB1, and it was expressed preferentially in brain tissue on Northern blots. Confocal microscopy demonstrated that exogenous EB3, like EB1, is associated with the cytoplasmic microtubule network. Moreover, in these experiments EB3 and APCL appeared together in the perinucleus and the cytoplasmic microtubule network. Since APCL is also expressed highly and specifically in the central nervous system, APCL-EB3 interaction may be specific to the CNS, possibly involving stability and/or extension of microtubules during neuritogenesis.

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Acknowledgements

We gratefully acknowledge the technical assistance of Mikio Suzuki, Eiichi Takahashi and Eiji Ouki. This work was supported in part by a Grant-in-Aid from the Ministry of Education, Science, Sports, and Culture of Japan, and by a `Research for the Future' Program Grant (96L00102) of The Japan Society for the Promotion of Science.

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Authors and Affiliations

  1. Division of Clinical Genetics, Biomedical Research Center, Osaka University Medical School, Osaka, 565-0871, Japan

    Hidewaki Nakagawa, Kumiko Koyama & Yusuke Nakamura

  2. Laboratory Molecular Medicine, Human Genome Center, Institute of Medical Science, The University of Tokyo, Tokyo, 108-8639, Japan

    Kumiko Koyama & Yusuke Nakamura

  3. Department of Oncogene Research, Institute of Microbial Disease, Osaka University, Osaka, 565-0871, Japan

    Yoji Murata, Monden Morito & Tetsu Akiyama

  4. The 2nd Department of Surgery, Osaka University Medical School, Osaka, 565-0871, Japan

    Hidewaki Nakagawa

  5. Department of Human Genome Analysis, Cancer Chemotherapy Center, Japanese Foundation for Cancer Research, Tokyo, 170-8544, Japan

    Kumiko Koyama

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  1. Hidewaki Nakagawa
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Nakagawa, H., Koyama, K., Murata, Y. et al. EB3, a novel member of the EB1 family preferentially expressed in the central nervous system, binds to a CNS-specific APC homologue. Oncogene 19, 210–216 (2000). https://doi.org/10.1038/sj.onc.1203308

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